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González-Troncoso D, Maroto JM, Mera ME, Morán M. Equilibrium, transient dynamics and sustainable reference points under age-specific natural mortality rates and varying levels of population productivity: The case of the Northern cod stock. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 349:119452. [PMID: 37939470 DOI: 10.1016/j.jenvman.2023.119452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 10/12/2023] [Accepted: 10/21/2023] [Indexed: 11/10/2023]
Abstract
Scientific advisory bodies provide scientific advice for sustainable fisheries management based on the precautionary approach and maximum sustainable yield (MSY) reference points, such as spawning stock biomass (SSB) value Blim, and fishing mortality giving MSY, FMSY. The lack of a stock-recruitment function (SRF) to identify a clear breakpoint Blim has recently emerged in important stock collapses. It also precludes the use of equilibrium-based methods to analyze the sustainability of FMSY. Considering a hockey stick (HS) SRF, we propose here an equilibrium-based method that characterizes the equilibriums, their stability properties, transient dynamics, and changes in productivity (including age-specific natural mortality rates). We show that these relevant factors, not taken into account in standard methods, should play a central role in fisheries management and conservation. Considering the Northern cod stock (NCS) (Gadus morhua) by way of illustration, we properly estimate the HS and its associated Blim. We find that the HS fitted by the Fisheries Library in R underestimates Blim. Additionally, we determine the levels of productivity (medium-low or medium-high), and their corresponding growth rates of the SSB, which are consistent with the observed population dynamics. We find that the NCS was managed during the 1980s under myopic (unsustainable) harvest control rules, neglecting high age-specific natural mortality rates. We also find that recovery of the NCS remains a distant prospect, despite the current stable, positive equilibrium (sustainable FMSY).
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Affiliation(s)
| | - José M Maroto
- Department of Economía Financiera y Actuarial y Estadística, Universidad Complutense, 28223, Madrid, Spain; IMI-Institute of Interdisciplinary Mathematics, Universidad Complutense, 28040, Madrid, Spain.
| | - M Eugenia Mera
- Department of Análisis Económico y Economía Cuantitativa, Universidad Complutense, 28223, Madrid, Spain.
| | - Manuel Morán
- IMI-Institute of Interdisciplinary Mathematics, Universidad Complutense, 28040, Madrid, Spain; Department of Análisis Económico y Economía Cuantitativa, Universidad Complutense, 28223, Madrid, Spain.
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2
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Godwin JL, Lumley AJ, Michalczyk Ł, Martin OY, Gage MJG. Mating patterns influence vulnerability to the extinction vortex. GLOBAL CHANGE BIOLOGY 2020; 26:4226-4239. [PMID: 32558066 DOI: 10.1111/gcb.15186] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 03/25/2020] [Accepted: 05/13/2020] [Indexed: 06/11/2023]
Abstract
Earth's biodiversity is undergoing mass extinction due to anthropogenic compounding of environmental, demographic and genetic stresses. These different stresses can trap populations within a reinforcing feedback loop known as the extinction vortex, in which synergistic pressures build upon one another through time, driving down population viability. Sexual selection, the widespread evolutionary force arising from competition, choice and reproductive variance within animal mating patterns could have vital consequences for population viability and the extinction vortex: (a) if sexual selection reinforces natural selection to fix 'good genes' and purge 'bad genes', then mating patterns encouraging competition and choice may help protect populations from extinction; (b) by contrast, if mating patterns create load through evolutionary or ecological conflict, then population viability could be further reduced by sexual selection. We test between these opposing theories using replicate populations of the model insect Tribolium castaneum exposed to over 10 years of experimental evolution under monogamous versus polyandrous mating patterns. After a 95-generation history of divergence in sexual selection, we compared fitness and extinction of monogamous versus polyandrous populations through an experimental extinction vortex comprising 15 generations of cycling environmental and genetic stresses. Results showed that lineages from monogamous evolutionary backgrounds, with limited opportunities for sexual selection, showed rapid declines in fitness and complete extinction through the vortex. By contrast, fitness of populations from the history of polyandry, with stronger opportunities for sexual selection, declined slowly, with 60% of populations surviving by the study end. The three vortex stresses of (a) nutritional deprivation, (b) thermal stress and (c) genetic bottlenecking had similar impacts on fitness declines and extinction risk, with an overall sigmoid decline in survival through time. We therefore reveal sexual selection as an important force behind lineages facing extinction threats, identifying the relevance of natural mating patterns for conservation management.
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Affiliation(s)
- Joanne L Godwin
- School of Biological Sciences, University of East Anglia, Norwich, UK
| | - Alyson J Lumley
- School of Biological Sciences, University of East Anglia, Norwich, UK
| | - Łukasz Michalczyk
- Institute of Zoology and Biomedical Research, Jagiellonian University, Kraków, Poland
| | - Oliver Y Martin
- Department of Biology (D-BIOL) & Institute of Integrative Biology (IBZ), ETH Zurich, Zürich, Switzerland
| | - Matthew J G Gage
- School of Biological Sciences, University of East Anglia, Norwich, UK
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3
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Bourret V, Albert V, April J, Côté G, Morissette O. Past, present and future contributions of evolutionary biology to wildlife forensics, management and conservation. Evol Appl 2020; 13:1420-1434. [PMID: 32684967 PMCID: PMC7359848 DOI: 10.1111/eva.12977] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 03/27/2020] [Accepted: 03/31/2020] [Indexed: 12/14/2022] Open
Abstract
Successfully implementing fundamental concepts into concrete applications is challenging in any given field. It requires communication, collaboration and shared will between researchers and practitioners. We argue that evolutionary biology, through research work linked to conservation, management and forensics, had a significant impact on wildlife agencies and department practices, where new frameworks and applications have been implemented over the last decades. The Quebec government's Wildlife Department (MFFP: Ministère des Forêts, de la Faune et des Parcs) has been proactive in reducing the “research–implementation” gap, thanks to prolific collaborations with many academic researchers. Among these associations, our department's outstanding partnership with Dr. Louis Bernatchez yielded significant contributions to harvest management, stocking programmes, definition of conservation units, recovery of threatened species, management of invasive species and forensic applications. We discuss key evolutionary biology concepts and resulting concrete examples of their successful implementation that derives directly or indirectly from this successful partnership. While old and new threats to wildlife are bringing new challenges, we expect recent developments in eDNA and genomics to provide innovative solutions as long as the research–implementation bridge remains open.
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Affiliation(s)
- Vincent Bourret
- Direction générale de la protection de la faune Ministère des Forêts, de la Faune et des Parcs Québec QC Canada
| | - Vicky Albert
- Direction générale de la protection de la faune Ministère des Forêts, de la Faune et des Parcs Québec QC Canada
| | - Julien April
- Direction générale de la gestion de la faune et des habitats Ministère des Forêts, de la Faune et des Parcs Québec QC Canada
| | - Guillaume Côté
- Direction générale de la gestion de la faune et des habitats Ministère des Forêts, de la Faune et des Parcs Québec QC Canada
| | - Olivier Morissette
- Direction générale de la gestion de la faune et des habitats Ministère des Forêts, de la Faune et des Parcs Québec QC Canada
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Brady SP, Bolnick DI, Barrett RDH, Chapman L, Crispo E, Derry AM, Eckert CG, Fraser DJ, Fussmann GF, Gonzalez A, Guichard F, Lamy T, Lane J, McAdam AG, Newman AEM, Paccard A, Robertson B, Rolshausen G, Schulte PM, Simons AM, Vellend M, Hendry A. Understanding Maladaptation by Uniting Ecological and Evolutionary Perspectives. Am Nat 2019; 194:495-515. [PMID: 31490718 DOI: 10.1086/705020] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Evolutionary biologists have long trained their sights on adaptation, focusing on the power of natural selection to produce relative fitness advantages while often ignoring changes in absolute fitness. Ecologists generally have taken a different tack, focusing on changes in abundance and ranges that reflect absolute fitness while often ignoring relative fitness. Uniting these perspectives, we articulate various causes of relative and absolute maladaptation and review numerous examples of their occurrence. This review indicates that maladaptation is reasonably common from both perspectives, yet often in contrasting ways. That is, maladaptation can appear strong from a relative fitness perspective, yet populations can be growing in abundance. Conversely, resident individuals can appear locally adapted (relative to nonresident individuals) yet be declining in abundance. Understanding and interpreting these disconnects between relative and absolute maladaptation, as well as the cases of agreement, is increasingly critical in the face of accelerating human-mediated environmental change. We therefore present a framework for studying maladaptation, focusing in particular on the relationship between absolute and relative fitness, thereby drawing together evolutionary and ecological perspectives. The unification of these ecological and evolutionary perspectives has the potential to bring together previously disjunct research areas while addressing key conceptual issues and specific practical problems.
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5
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Gíslason D, Heino M, Robinson BW, McLaughlin RB, Dunlop ES. Reaction norm analysis reveals rapid shifts toward delayed maturation in harvested Lake Erie yellow perch ( Perca flavescens). Evol Appl 2019; 12:888-901. [PMID: 31080503 PMCID: PMC6503831 DOI: 10.1111/eva.12764] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 12/22/2018] [Accepted: 12/27/2018] [Indexed: 11/28/2022] Open
Abstract
Harvested marine fish stocks often show a rapid and substantial decline in the age and size at maturation. Such changes can arise from multiple processes including fisheries-induced evolution, phenotypic plasticity, and responses to environmental factors other than harvest. The relative importance of these processes could differ systematically between marine and freshwater systems. We tested for temporal shifts in the mean and within-cohort variability of age- and size-based maturation probabilities of female yellow perch (Perca flavescens Mitchill) from four management units (MUs) in Lake Erie. Lake Erie yellow perch have been commercially harvested for more than a century, and age and size at maturation have varied since sampling began in the 1980s. Our analysis compared probabilistic maturation reaction norms (PMRNs) for cohorts when abundance was lower and harvest higher (1993-1998) to cohorts when abundance was higher and harvest lower (2005-2010). PMRNs have been used in previous studies to detect signs of evolutionary change in response to harvest. Maturation size threshold increased between the early and late cohorts, and the increases were statistically significant for the youngest age in the western MU1 and for older ages in the eastern MU3. Maturation envelope widths, a measure of the variability in maturation among individuals in a cohort, also increased between early and late cohorts in the western MUs where harvest was highest. The highest rates of change in size at maturation for a given age were as large or larger than rates reported for harvested marine fishes where declines in age and size at maturation have been observed. Contrary to the general observation of earlier maturation evolving in harvested stocks, female yellow perch in Lake Erie may be rapidly evolving delayed maturation since harvest was relaxed in the late 1990s, providing a rare example of possible evolutionary recovery.
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Affiliation(s)
- Davíð Gíslason
- Department of Integrative BiologyUniversity of GuelphGuelphOntarioCanada
- Matís OhfReykjavíkIceland
| | - Mikko Heino
- Department of BiologyUniversity of BergenBergenNorway
- Institute of Marine ResearchBergenNorway
- Evolution and Ecology ProgramInternational Institute for Applied Systems AnalysisLaxenburgAustria
- Institute of OceanographyNational Taiwan UniversityTaipeiTaiwan
| | - Beren W. Robinson
- Department of Integrative BiologyUniversity of GuelphGuelphOntarioCanada
| | | | - Erin S. Dunlop
- Aquatic Research and Monitoring SectionOntario Ministry of Natural Resources and ForestryPeterboroughOntarioCanada
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Gobin J, Lester NP, Fox MG, Dunlop ES. Ecological change alters the evolutionary response to harvest in a freshwater fish. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2018; 28:2175-2186. [PMID: 30285303 DOI: 10.1002/eap.1805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 07/09/2018] [Accepted: 08/20/2018] [Indexed: 06/08/2023]
Abstract
Harvesting can induce rapid evolution in animal populations, yet the role of ecological change in buffering or enhancing that response is poorly understood. Here, we developed an eco-genetic model to examine how ecological changes brought about by two notorious invasive species, zebra and quagga mussels, influence harvest-induced evolution and resilience in a freshwater fish. Our study focused on lake whitefish (Coregonus clupeaformis) in the Laurentian Great Lakes, where the species supports valuable commercial and subsistence fisheries, and where the invasion of dreissenid (zebra and quagga) mussels caused drastic shifts in ecosystem productivity. Using our model system, we predicted faster rates of evolution of maturation reaction norms in lake whitefish under pre-invasion ecosystem conditions when growth and recruitment of young to the population were high. Slower growth rates that occurred under post-invasion conditions delayed when fish became vulnerable to the fishery, thus decreasing selection pressure and lessening the evolutionary response to harvest. Fishing with gill nets and traps nets generally selected for early maturation at small sizes, except when fishing at low levels with small mesh gill nets under pre-invasion conditions; in this latter case, evolution of delayed maturation was predicted. Overall, the invasion of dreissenid mussels lessened the evolutionary response to harvest, while also reducing the productivity and commercial yield potential of the stock. These results demonstrate how ecological conditions shape evolutionary outcomes and how invasive species can have a direct effect on evolutionary responses to harvest and sustainability.
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Affiliation(s)
- Jenilee Gobin
- Environmental and Life Sciences Graduate Program, Trent University, 1600 West Bank Drive, Peterborough, Ontario, K9J 7B8, Canada
| | - Nigel P Lester
- Aquatic Research and Monitoring Section, Trent University, Ontario Ministry of Natural Resources and Forestry, 2140 East Bank Drive, DNA Bldg., Peterborough, Ontario, K9J 8N8, Canada
| | - Michael G Fox
- Trent School of the Environment and Department of Biology, Trent University, 1600 West Bank Drive, Peterborough, Ontario, K9J 7B8, Canada
| | - Erin S Dunlop
- Environmental and Life Sciences Graduate Program, Trent University, 1600 West Bank Drive, Peterborough, Ontario, K9J 7B8, Canada
- Aquatic Research and Monitoring Section, Trent University, Ontario Ministry of Natural Resources and Forestry, 2140 East Bank Drive, DNA Bldg., Peterborough, Ontario, K9J 8N8, Canada
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8
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Morbey YE, Mema M. Size-selective fishing and the potential for fisheries-induced evolution in lake whitefish. Evol Appl 2018; 11:1412-1424. [PMID: 30151049 PMCID: PMC6099822 DOI: 10.1111/eva.12635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 03/21/2018] [Indexed: 12/01/2022] Open
Abstract
The long-term evolutionary effects of fishing on maturation schedules can depend on gear type, the shape of the gear type's size-selectivity function, and the size and age structure of a population. Our goal was to better understand how environmentally induced differences in somatic growth influence the evolutionary effects of size-selective fisheries, using lake whitefish (Coregonus clupeaformis) in Lake Huron as a case study. Using a state-dependent optimization model of energy allocation parameterized for lake whitefish, we show that fishing with gill nets (bell-shaped selectivity) and trap nets (sigmoid-shaped selectivity) can be potent agents of selection on size thresholds for maturity. Compared to trap nets and large mesh (114 mm) gill nets, small mesh (89 mm) gill nets are better able to buffer populations from fishing-induced evolution by safeguarding large, fecund fish, but only when overall fishing mortality is low and growth rates sufficiently fast such that fish can outgrow vulnerable size classes. Regardless of gear type, and all else being equal, high fishing mortality in combination with low growth rates is expected to intensify the long-term evolutionary effects of fishing.
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Affiliation(s)
| | - Marin Mema
- Department of BiologyWestern UniversityLondonOntarioCanada
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9
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A Review of the European Union Landing Obligation Focusing on Its Implications for Fisheries and the Environment. SUSTAINABILITY 2018. [DOI: 10.3390/su10040900] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Discarding is a common practice in fisheries. Total discards are estimated to be about 30 million tons, representing around 23% of worldwide catches. Discarding is an undesirable practice, not only because of the waste of resources, but also because of its contribution to the overexploitation of fish stocks. Several countries have already established discard bans, to different extents (e.g., Norway, Iceland, Chile, New Zealand). The EU’s landing obligation (discard ban) is a major measure of the latest reform of the Common Fisheries Policy for EU fisheries. It aims to reduce unwanted catches in EU fisheries, by incentivizing improved selectivity and restoring fish stocks to levels that can sustain the maximum production over time without harming the biodiversity and the capacity of future generations to obtain fish. However, banning discards will inevitably induce diverse short- and long-term ecological, economic, and social impacts, which may determine whether the landing obligation’s objectives will be achieved.
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10
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Kuparinen A, Festa-Bianchet M. Harvest-induced evolution: insights from aquatic and terrestrial systems. Philos Trans R Soc Lond B Biol Sci 2017; 372:rstb.2016.0036. [PMID: 27920381 DOI: 10.1098/rstb.2016.0036] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/04/2016] [Indexed: 12/29/2022] Open
Abstract
Commercial and recreational harvests create selection pressures for fitness-related phenotypic traits that are partly under genetic control. Consequently, harvesting can drive evolution in targeted traits. However, the quantification of harvest-induced evolutionary life history and phenotypic changes is challenging, because both density-dependent feedback and environmental changes may also affect these changes through phenotypic plasticity. Here, we synthesize current knowledge and uncertainties on six key points: (i) whether or not harvest-induced evolution is happening, (ii) whether or not it is beneficial, (iii) how it shapes biological systems, (iv) how it could be avoided, (v) its importance relative to other drivers of phenotypic changes, and (vi) whether or not it should be explicitly accounted for in management. We do this by reviewing findings from aquatic systems exposed to fishing and terrestrial systems targeted by hunting. Evidence from aquatic systems emphasizes evolutionary effects on age and size at maturity, while in terrestrial systems changes are seen in weapon size and date of parturition. We suggest that while harvest-induced evolution is likely to occur and negatively affect populations, the rate of evolutionary changes and their ecological implications can be managed efficiently by simply reducing harvest intensity.This article is part of the themed issue 'Human influences on evolution, and the ecological and societal consequences'.
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Affiliation(s)
- Anna Kuparinen
- Department of Environmental Sciences, University of Helsinki, PO Box 65, 00014 Helsinki, Finland
| | - Marco Festa-Bianchet
- Département de biologie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
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11
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Engen S, Sæther BE. Extinction Risk and Lack of Evolutionary Rescue under Resource Depletion or Area Reduction. Am Nat 2017; 190:73-82. [DOI: 10.1086/692011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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12
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Svedäng H, Hornborg S. Historic changes in length distributions of three Baltic cod ( Gadus morhua) stocks: Evidence of growth retardation. Ecol Evol 2017; 7:6089-6102. [PMID: 28861215 PMCID: PMC5574768 DOI: 10.1002/ece3.3173] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 05/12/2017] [Accepted: 05/25/2017] [Indexed: 11/16/2022] Open
Abstract
Understanding how combinations of fishing effort and selectivity affect productivity is central to fisheries research. We investigate the roles of fishing regulation in comparison with ecosystem status for Baltic Sea cod stock productivity, growth performance, and population stability. This case study is interesting because three cod populations with different exploitation patterns and stock status are located in three adjacent but partially, ecologically different areas. In assessing stock status, growth, and productivity, we use survey information and rather basic stock parameters without relying on age readings. Because there is an urgent interest of better understanding of the current development of the Eastern Baltic cod stock, we argue that our approach represents partly a novel way of interpreting monitoring information together with catch data in a simplified yet more informative way. Our study reports how the Eastern and Western Baltic cod have gone toward more truncated size structures between 1991 and 2016, in particular for the Eastern Baltic cod, whereas the Öresund cod show no trend. We suggest that selective fishing may disrupt fish population dynamic stability and that lower natural productivity might amplify the effects of selective fishing. In support of earlier findings on a density‐dependent growth of Eastern Baltic cod, management is advised to acknowledge that sustainable exploitation levels for Eastern Baltic cod are much more limited than perceived in regular assessments. Of more general importance, our results emphasize the need to embrace a more realistic view on what ecosystems can produce regarding tractable fish biomass to facilitate a more ecosystem‐based fisheries management.
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Affiliation(s)
- Henrik Svedäng
- Department of Aquatic Resources Institute of Marine Research Swedish University of Agricultural Sciences Lysekil Sweden.,Present address: Swedish Institute for the Marine Environment (SIME) Gothenburg Swedenand.,Present address: Baltic Sea Centre Stockholm University Stockholm Sweden
| | - Sara Hornborg
- RISE - Research Institutes of Sweden, Agrifood and Bioscience, Sustainable Food Production Gothenburg Sweden
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13
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Kvalnes T, Saether BE, Haanes H, Røed KH, Engen S, Solberg EJ. Harvest-induced phenotypic selection in an island population of moose, Alces alces. Evolution 2016; 70:1486-500. [PMID: 27174031 DOI: 10.1111/evo.12952] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 04/29/2016] [Indexed: 01/20/2023]
Abstract
Empirical evidence strongly indicates that human exploitation has frequently led to rapid evolutionary changes in wild populations, yet the mechanisms involved are often poorly understood. Here, we applied a recently developed demographic framework for analyzing selection to data from a 20-year study of a wild population of moose, Alces alces. In this population, a genetic pedigree has been established all the way back to founders. We demonstrate harvest-induced directional selection for delayed birth dates in males and reduced body mass as calf in females. During the study period, birth date was delayed by 0.81 days per year for both sexes, whereas no significant changes occurred in calf body mass. Quantitative genetic analyses indicated that both traits harbored significant additive genetic variance. These results show that selective harvesting can induce strong selection that oppose natural selection. This may cause evolution of less favorable phenotypes that become maladaptive once harvesting ceases.
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Affiliation(s)
- Thomas Kvalnes
- Centre for Biodiversity Dynamics (CBD), Department of Biology, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway.
| | - Bernt-Erik Saether
- Centre for Biodiversity Dynamics (CBD), Department of Biology, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
| | - Hallvard Haanes
- Norwegian Radiation Protection Authority, NO-1361 Østerås, Norway
| | - Knut H Røed
- Department of Basic Sciences and Aquatic Medicine, Norwegian University of Life Sciences, PO-8146 Dep, NO-0033 Oslo, Norway
| | - Steinar Engen
- Centre for Biodiversity Dynamics (CBD), Department of Mathematical Sciences, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
| | - Erling J Solberg
- Norwegian Institute for Nature Research (NINA), NO-7485 Trondheim, Norway
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14
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Ward TD, Algera DA, Gallagher AJ, Hawkins E, Horodysky A, Jørgensen C, Killen SS, McKenzie DJ, Metcalfe JD, Peck MA, Vu M, Cooke SJ. Understanding the individual to implement the ecosystem approach to fisheries management. CONSERVATION PHYSIOLOGY 2016; 4:cow005. [PMID: 27293757 PMCID: PMC4825417 DOI: 10.1093/conphys/cow005] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 01/25/2016] [Accepted: 02/08/2016] [Indexed: 05/20/2023]
Abstract
Ecosystem-based approaches to fisheries management (EAFMs) have emerged as requisite for sustainable use of fisheries resources. At the same time, however, there is a growing recognition of the degree of variation among individuals within a population, as well as the ecological consequences of this variation. Managing resources at an ecosystem level calls on practitioners to consider evolutionary processes, and ample evidence from the realm of fisheries science indicates that anthropogenic disturbance can drive changes in predominant character traits (e.g. size at maturity). Eco-evolutionary theory suggests that human-induced trait change and the modification of selective regimens might contribute to ecosystem dynamics at a similar magnitude to species extirpation, extinction and ecological dysfunction. Given the dynamic interaction between fisheries and target species via harvest and subsequent ecosystem consequences, we argue that individual diversity in genetic, physiological and behavioural traits are important considerations under EAFMs. Here, we examine the role of individual variation in a number of contexts relevant to fisheries management, including the potential ecological effects of rapid trait change. Using select examples, we highlight the extent of phenotypic diversity of individuals, as well as the ecological constraints on such diversity. We conclude that individual phenotypic diversity is a complex phenomenon that needs to be considered in EAFMs, with the ultimate realization that maintaining or increasing individual trait diversity may afford not only species, but also entire ecosystems, with enhanced resilience to environmental perturbations. Put simply, individuals are the foundation from which population- and ecosystem-level traits emerge and are therefore of central importance for the ecosystem-based approaches to fisheries management.
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Affiliation(s)
- Taylor D. Ward
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON, CanadaK1S 5B6
- Corresponding author: Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada K1S 5B6.
| | - Dirk A. Algera
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON, CanadaK1S 5B6
| | - Austin J. Gallagher
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON, CanadaK1S 5B6
| | - Emily Hawkins
- Department of Biology, University of Ottawa, 30 Marie-Curie Private, Ottawa, ON, CanadaK1N 9B4
| | - Andrij Horodysky
- Department of Marine and Environmental Science, Hampton University, Hampton, VA 23668, USA
| | - Christian Jørgensen
- Department of Biology and Hjort Centre for Marine Ecosystem Dynamics, University of Bergen, PO Box 7803, Bergen 5020, Norway
| | - Shaun S. Killen
- Institute of Biodiversity, Animal Health, and Comparative Medicine, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ, UK
| | - David J. McKenzie
- Equipe Diversité et Ecologie des Poissons, UMR5119 Ecologie des Systèmes Marins Côtiers, Université Montpellier, Place Eugène Bataillon, Montpellier cedex 5 34095, France
| | - Julian D. Metcalfe
- Centre for Environment, Fisheries and Aquaculture Science (Cefas), Lowestoft Laboratory, Suffolk NR33 0HT, UK
| | - Myron A. Peck
- Institute of Hydrobiology and Fisheries Science, Center for Earth System Research and Sustainability, Olbersweg 24, Hamburg 22767, Germany
| | - Maria Vu
- Department of Biology, University of Ottawa, 30 Marie-Curie Private, Ottawa, ON, CanadaK1N 9B4
| | - Steven J. Cooke
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON, CanadaK1S 5B6
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15
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Dunlop ES, Eikeset AM, Stenseth NC. From genes to populations: how fisheries-induced evolution alters stock productivity. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2015; 25:1860-1868. [PMID: 26591452 DOI: 10.1890/14-1862.1] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
By removing individuals with certain heritable characteristics such as large body size, harvesting may induce rapid evolutionary change in fish life history. There is controversy, however, as to the prevalence of fisheries-induced evolution (FIE) and to what extent it should be considered as part of sustainable resource management. Recent research has shown that FIE can be difficult to detect and its economic effects might not always be significant. Here, we show how population growth rate (r), a critical factor affecting sustainability and recovery, is affected by FIE through the analysis of a simulation model that demonstrates the link between individual-level genetic processes and stock dynamics. We examine how different levels of evolvability, fishing intensity, and density-dependence interact to influence r in three commercially harvested species: Atlantic cod (Gadus morhua), lake whitefish (Coregonus clupeaformis), and yellow perch (Perca flavescens). We demonstrate that at low harvest levels, evolution has minimal effect on r for all three species. However, at the harvest rates experienced by many fish stocks, evolution increases r and reduces the risk of collapse for cod and whitefish. During the initial stages of a harvest moratorium, a switch occurs, and r becomes reduced as a consequence of evolution. These results explain how evolution increases stock resilience, but also impedes recovery after periods of intense harvesting.
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Uusi-Heikkilä S, Whiteley AR, Kuparinen A, Matsumura S, Venturelli PA, Wolter C, Slate J, Primmer CR, Meinelt T, Killen SS, Bierbach D, Polverino G, Ludwig A, Arlinghaus R. The evolutionary legacy of size-selective harvesting extends from genes to populations. Evol Appl 2015; 8:597-620. [PMID: 26136825 PMCID: PMC4479515 DOI: 10.1111/eva.12268] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 04/05/2015] [Indexed: 12/18/2022] Open
Abstract
Size-selective harvesting is assumed to alter life histories of exploited fish populations, thereby negatively affecting population productivity, recovery, and yield. However, demonstrating that fisheries-induced phenotypic changes in the wild are at least partly genetically determined has proved notoriously difficult. Moreover, the population-level consequences of fisheries-induced evolution are still being controversially discussed. Using an experimental approach, we found that five generations of size-selective harvesting altered the life histories and behavior, but not the metabolic rate, of wild-origin zebrafish (Danio rerio). Fish adapted to high positively size selective fishing pressure invested more in reproduction, reached a smaller adult body size, and were less explorative and bold. Phenotypic changes seemed subtle but were accompanied by genetic changes in functional loci. Thus, our results provided unambiguous evidence for rapid, harvest-induced phenotypic and evolutionary change when harvesting is intensive and size selective. According to a life-history model, the observed life-history changes elevated population growth rate in harvested conditions, but slowed population recovery under a simulated moratorium. Hence, the evolutionary legacy of size-selective harvesting includes populations that are productive under exploited conditions, but selectively disadvantaged to cope with natural selection pressures that often favor large body size.
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Affiliation(s)
- Silva Uusi-Heikkilä
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries Berlin, Germany ; Division of Genetics and Physiology, Department of Biology, University of Turku Turku, Finland
| | - Andrew R Whiteley
- Department of Environmental Conservation, University of Massachusetts Amherst, MA, USA
| | - Anna Kuparinen
- Department of Environmental Sciences, University of Helsinki Helsinki, Finland
| | | | - Paul A Venturelli
- Department of Fisheries, Wildlife, and Conservation Biology, University of Minnesota St Paul, MN, USA
| | - Christian Wolter
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries Berlin, Germany
| | - Jon Slate
- Department of Animal and Plant Sciences, University of Sheffield, Western Bank Sheffield, UK
| | - Craig R Primmer
- Division of Genetics and Physiology, Department of Biology, University of Turku Turku, Finland
| | - Thomas Meinelt
- Department of Ecophysiology and Aquaculture, Leibniz-Institute of Freshwater Ecology and Inland Fisheries Berlin, Germany
| | - Shaun S Killen
- Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary & Life Sciences, University of Glasgow Glasgow, UK
| | - David Bierbach
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries Berlin, Germany
| | - Giovanni Polverino
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries Berlin, Germany
| | - Arne Ludwig
- Department of Evolutionary Genetics, Leibniz-Institute for Zoo and Wildlife Research Berlin, Germany
| | - Robert Arlinghaus
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries Berlin, Germany ; Chair of Integrative Fisheries Management, Faculty of Life Sciences, Albrecht-Daniel-Thaer Institute of Agricultural and Horticultural Sciences, Humboldt-Universität zu Berlin Berlin, Germany
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Abstract
There is increasing evidence that fishing may cause rapid contemporary evolution in freshwater and marine fish populations. This has led to growing concern about the possible consequences such evolutionary change might have for aquatic ecosystems and the utility of those ecosystems to society. This special issue contains contributions from a symposium on fisheries-induced evolution held at the American Fisheries Society Annual Meeting in August 2008. Contributions include primary studies and reviews of field-based and experimental evidence, and several theoretical modeling studies advancing life-history theory and investigating potential management options. In this introduction we review the state of research in the field, discuss current controversies, and identify contributions made by the papers in this issue to the knowledge of fisheries-induced evolution. We end by suggesting directions for future research.
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Affiliation(s)
- Erin S Dunlop
- Aquatic Research and Development Section, Ontario Ministry of Natural Resources Peterborough, ON, Canada ; Department of Biology, University of Bergen Bergen, Norway ; Institute of Marine Research Nordnes, Bergen, Norway
| | - Katja Enberg
- Department of Biology, University of Bergen Bergen, Norway
| | | | - Mikko Heino
- Department of Biology, University of Bergen Bergen, Norway ; Institute of Marine Research Nordnes, Bergen, Norway ; International Institute for Applied Systems Analysis Laxenburg, Austria
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18
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Jørgensen C, Ernande B, Fiksen Ø. Size-selective fishing gear and life history evolution in the Northeast Arctic cod. Evol Appl 2015; 2:356-70. [PMID: 25567886 PMCID: PMC3352490 DOI: 10.1111/j.1752-4571.2009.00075.x] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Accepted: 03/23/2009] [Indexed: 11/30/2022] Open
Abstract
Industrial fishing has been identified as a cause for life history changes in many harvested stocks, mainly because of the intense fishing mortality and its size-selectivity. Because these changes are potentially evolutionary, we investigate evolutionarily stable life-histories and yield in an energy-allocation state-dependent model for Northeast Arctic cod Gadus morhua. We focus on the evolutionary effects of size-selective fishing because regulation of gear selectivity may be an efficient management tool. Trawling, which harvests fish above a certain size, leads to early maturation except when fishing is low and confined to mature fish. Gillnets, where small and large fish escape, lead to late maturation for low to moderate harvest rates, but when harvest rates increase maturation age suddenly drops. This is because bell-shaped selectivity has two size-refuges, for fish that are below and above the harvestable size-classes. Depending on the harvest rate it either pays to grow through the harvestable slot and mature above it, or mature small below it. Sustainable yield on the evolutionary time-scale is highest when fishing is done by trawling, but only for a small parameter region. Fishing with gillnets is better able to withstand life-history evolution, and maintains yield over a wider range of fishing intensities.
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Affiliation(s)
| | - Bruno Ernande
- Laboratoire Ressources Halieutiques, IFREMER Port-en-bessin, France
| | - Øyvind Fiksen
- Department of Biology, University of Bergen Bergen, Norway
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Enberg K, Jørgensen C, Dunlop ES, Heino M, Dieckmann U. Implications of fisheries-induced evolution for stock rebuilding and recovery. Evol Appl 2015; 2:394-414. [PMID: 25567888 PMCID: PMC3352485 DOI: 10.1111/j.1752-4571.2009.00077.x] [Citation(s) in RCA: 185] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2008] [Accepted: 04/27/2009] [Indexed: 01/16/2023] Open
Abstract
Worldwide depletion of fish stocks has led fisheries managers to become increasingly concerned about rebuilding and recovery planning. To succeed, factors affecting recovery dynamics need to be understood, including the role of fisheries-induced evolution. Here we investigate a stock's response to fishing followed by a harvest moratorium by analyzing an individual-based evolutionary model parameterized for Atlantic cod Gadus morhua from its northern range, representative of long-lived, late-maturing species. The model allows evolution of life-history processes including maturation, reproduction, and growth. It also incorporates environmental variability, phenotypic plasticity, and density-dependent feedbacks. Fisheries-induced evolution affects recovery in several ways. The first decades of recovery were dominated by demographic and density-dependent processes. Biomass rebuilding was only lightly influenced by fisheries-induced evolution, whereas other stock characteristics such as maturation age, spawning stock biomass, and recruitment were substantially affected, recovering to new demographic equilibria below their preharvest levels. This is because genetic traits took thousands of years to evolve back to preharvest levels, indicating that natural selection driving recovery of these traits is weaker than fisheries-induced selection was. Our results strengthen the case for proactive management of fisheries-induced evolution, as the restoration of genetic traits altered by fishing is slow and may even be impractical.
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Affiliation(s)
- Katja Enberg
- Department of Biology, University of Bergenyy Bergen, Norway ; Evolution and Ecology Program, International Institute for Applied Systems Analysis Laxenburg, Austria
| | | | - Erin S Dunlop
- Department of Biology, University of Bergenyy Bergen, Norway ; Evolution and Ecology Program, International Institute for Applied Systems Analysis Laxenburg, Austria ; Aquatic Research and Development Section, Ontario Ministry of Natural Resources Peterborough, ON, Canada ; Institute of Marine Research Bergen, Norway
| | - Mikko Heino
- Department of Biology, University of Bergenyy Bergen, Norway ; Evolution and Ecology Program, International Institute for Applied Systems Analysis Laxenburg, Austria ; Institute of Marine Research Bergen, Norway
| | - Ulf Dieckmann
- Evolution and Ecology Program, International Institute for Applied Systems Analysis Laxenburg, Austria
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20
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Engen S, Lande R, Sæther BE. Evolutionary consequences of nonselective harvesting in density-dependent populations. Am Nat 2014; 184:714-26. [PMID: 25438172 DOI: 10.1086/678407] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
There is now considerable empirical evidence that evolutionary changes in many phenotypic characters, such as body mass, age at maturation, and timing of breeding, often occur in populations subject to intense harvesting over longer periods. Here, we analyze the evolutionary component of the selection due to nonselective harvesting, which will operate even under selective harvesting and may generate a large evolutionary response. If phenotype affects susceptibility to density dependence-for example, through resource limitation-then nonselective harvesting can induce evolutionary change through its effect on population density. We provide a model for evolution of a quantitative character in such a fluctuating density-dependent population, using the diffusion approximation to describe jointly the temporal changes in mean phenotype and log population size. We show how nonselective harvesting in particular generates r-selection governed by genetic variation in the strength of density regulation and the magnitude of population fluctuations. We show that r-selection caused by nonselective harvesting is proportional to the mean fraction of the population harvested. We then compare the short-term as well as the long-term evolutionary impact of nonselective harvesting for different harvesting strategies by using the mean harvest fraction for different strategies. This comparison is performed for three different harvesting strategies: constant, proportional, and threshold harvesting. The more ecologically sustainable strategies also produce smaller evolutionary changes.
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Affiliation(s)
- Steinar Engen
- Department of Mathematical Sciences, Center for Biodiversity Dynamics, Norwegian University of Science and Technology, Trondheim N-7491, Norway
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21
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Pelletier F, Festa-Bianchet M, Jorgenson JT, Feder C, Hubbs A. Can phenotypic rescue from harvest refuges buffer wild sheep from selective hunting? Ecol Evol 2014; 4:3375-82. [PMID: 25535554 PMCID: PMC4228612 DOI: 10.1002/ece3.1185] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 06/26/2014] [Accepted: 07/02/2014] [Indexed: 01/04/2023] Open
Abstract
Human harvests can unwittingly drive evolution on morphology and life history, and these selective effects may be detrimental to the management of natural resources. Although theory suggests that harvest refuges, as sources of unselected animals, could buffer the effects of human exploitation on wild populations, few studies have assessed their efficiency. We analyzed records from >7000 trophy bighorn rams (Ovis canadensis) harvested in Alberta, Canada, between 1974 and 2011 to investigate if the movement of rams from refuges toward harvested areas reduced the effects of selective harvesting on horn size through phenotypic rescue. Rams taken near refuges had horns on average about 3% longer than rams shot far from refuges and were slightly older, suggesting migration from refuges into hunted areas. Rams from areas adjacent to and far from harvest refuges, however, showed similar declines in horn length and increases in age at harvest over time, indicating a decreasing rate of horn growth. Our study suggests that the influx of rams from refuges is not sufficient to mitigate the selective effects of sheep trophy harvest. Instead, we suggest that selective hunting of highly mobile animals may affect the genetic structure of populations that spend part of the year inside protected areas.
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Affiliation(s)
- Fanie Pelletier
- Département de biologie, Université de Sherbrooke 2500 boulevard de l'université, Sherbrooke, Quebec, J1K 2R1, Canada
| | - Marco Festa-Bianchet
- Département de biologie, Université de Sherbrooke 2500 boulevard de l'université, Sherbrooke, Quebec, J1K 2R1, Canada
| | - Jon T Jorgenson
- Alberta Department of Sustainable Resource Development Suite 201, 800 Railway Ave., Canmore, Alberta, T1W 1P1, Canada
| | - Chiarastella Feder
- Fish and Wildlife Division, Alberta Department of Sustainable Resource Development 4919-51st St., Rocky Mountain House, Alberta, T4T 1B3, Canada
| | - Anne Hubbs
- Fish and Wildlife Division, Alberta Department of Sustainable Resource Development 4919-51st St., Rocky Mountain House, Alberta, T4T 1B3, Canada
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22
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Laugen AT, Engelhard GH, Whitlock R, Arlinghaus R, Dankel DJ, Dunlop ES, Eikeset AM, Enberg K, Jørgensen C, Matsumura S, Nusslé S, Urbach D, Baulier L, Boukal DS, Ernande B, Johnston FD, Mollet F, Pardoe H, Therkildsen NO, Uusi-Heikkilä S, Vainikka A, Heino M, Rijnsdorp AD, Dieckmann U. Evolutionary impact assessment: accounting for evolutionary consequences of fishing in an ecosystem approach to fisheries management. FISH AND FISHERIES (OXFORD, ENGLAND) 2014; 15:65-96. [PMID: 26430388 PMCID: PMC4579828 DOI: 10.1111/faf.12007] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Accepted: 07/30/2012] [Indexed: 05/26/2023]
Abstract
Managing fisheries resources to maintain healthy ecosystems is one of the main goals of the ecosystem approach to fisheries (EAF). While a number of international treaties call for the implementation of EAF, there are still gaps in the underlying methodology. One aspect that has received substantial scientific attention recently is fisheries-induced evolution (FIE). Increasing evidence indicates that intensive fishing has the potential to exert strong directional selection on life-history traits, behaviour, physiology, and morphology of exploited fish. Of particular concern is that reversing evolutionary responses to fishing can be much more difficult than reversing demographic or phenotypically plastic responses. Furthermore, like climate change, multiple agents cause FIE, with effects accumulating over time. Consequently, FIE may alter the utility derived from fish stocks, which in turn can modify the monetary value living aquatic resources provide to society. Quantifying and predicting the evolutionary effects of fishing is therefore important for both ecological and economic reasons. An important reason this is not happening is the lack of an appropriate assessment framework. We therefore describe the evolutionary impact assessment (EvoIA) as a structured approach for assessing the evolutionary consequences of fishing and evaluating the predicted evolutionary outcomes of alternative management options. EvoIA can contribute to EAF by clarifying how evolution may alter stock properties and ecological relations, support the precautionary approach to fisheries management by addressing a previously overlooked source of uncertainty and risk, and thus contribute to sustainable fisheries.
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Affiliation(s)
- Ane T Laugen
- Swedish University of Agricultural Sciences, Department of Ecology,Box 7044, SE-75643, Uppsala, Sweden
- IFREMER, Laboratoire Ressources Halieutiques,Avenue du Général de Gaulle, F-14520, Port-en-Bessin, France
| | - Georg H Engelhard
- Centre for Environment, Fisheries & Aquaculture Science (Cefas),Pakefield Road, Lowestoft, NR33 0HT, UK
| | - Rebecca Whitlock
- Evolution and Ecology Program, International Institute for Applied Systems Analysis (IIASA),Schlossplatz 1, A-2361, Laxenburg, Austria
- Hopkins Marine Station, Stanford University,120 Oceanview Blvd, Pacific Grove, CA, 93950, California, USA
- Finnish Game and Fisheries Research Institute,Itäinen Pitkäkatu 3, FI-20520, Turku, Finland
| | - Robert Arlinghaus
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries,Müggelseedamm 310, Berlin, 12587, Germany
- Department for Crop and Animal Sciences, Faculty of Agriculture and Horticulture, Humboldt-Universität zu Berlin,Philippstrasse 13, Haus 7, 10115, Berlin, Germany
| | - Dorothy J Dankel
- Institute of Marine Research,PO Box 1870, Nordnes, NO-5817, Bergen, Norway
| | - Erin S Dunlop
- Institute of Marine Research,PO Box 1870, Nordnes, NO-5817, Bergen, Norway
- EvoFish Research Group, Department of Biology, University of Bergen,Box 7803, NO-5020, Bergen, Norway
- Aquatic Research and Development Section, Ontario Ministry of Natural Resources,300 Water Street, PO Box 7000, Peterborough, ON, Canada, K9J 8M5
| | - Anne M Eikeset
- Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo,PO Box 1066, Blindern, NO-0316, Oslo, Norway
| | - Katja Enberg
- Institute of Marine Research,PO Box 1870, Nordnes, NO-5817, Bergen, Norway
- EvoFish Research Group, Department of Biology, University of Bergen,Box 7803, NO-5020, Bergen, Norway
| | - Christian Jørgensen
- EvoFish Research Group, Department of Biology, University of Bergen,Box 7803, NO-5020, Bergen, Norway
- Computational Ecology Unit, Uni Research,PO Box 7810, NO-5020, Bergen, Norway
| | - Shuichi Matsumura
- Evolution and Ecology Program, International Institute for Applied Systems Analysis (IIASA),Schlossplatz 1, A-2361, Laxenburg, Austria
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries,Müggelseedamm 310, Berlin, 12587, Germany
- Faculty of Applied Biological Sciences, Gifu University,Yanagido 1-1, Gifu, 501-1193, Japan
| | - Sébastien Nusslé
- Department of Ecology and Evolution, University of Lausanne,Biophore, CH-1015, Lausanne, Switzerland
- Conservation Biology, Bern University,Erlachstrasse 9a, CH-3012, Bern, Switzerland
| | - Davnah Urbach
- Evolution and Ecology Program, International Institute for Applied Systems Analysis (IIASA),Schlossplatz 1, A-2361, Laxenburg, Austria
- Department of Biological Sciences, Dartmouth College, The Class of 1978 Life Sciences Center,78 College Street, Hanover, NH, 03755, USA
| | - Loїc Baulier
- Institute of Marine Research,PO Box 1870, Nordnes, NO-5817, Bergen, Norway
- EvoFish Research Group, Department of Biology, University of Bergen,Box 7803, NO-5020, Bergen, Norway
- Fisheries and Aquatic Sciences Center, Agrocampus Ouest Centre de Rennes,65 rue de Saint Brieuc, CS 84215, F-35042, Rennes Cedex, France
| | - David S Boukal
- Institute of Marine Research,PO Box 1870, Nordnes, NO-5817, Bergen, Norway
- EvoFish Research Group, Department of Biology, University of Bergen,Box 7803, NO-5020, Bergen, Norway
- Department of Ecosystems Biology, Faculty of Science, University of South Bohemia,Branisovska 31, CZ-37005, České Budějovice, Czech Republic
| | - Bruno Ernande
- Evolution and Ecology Program, International Institute for Applied Systems Analysis (IIASA),Schlossplatz 1, A-2361, Laxenburg, Austria
- IFREMER, Laboratoire Ressources Halieutiques,150 quai Gambetta, BP 699, F-62321, Boulogne-sur-Mer, France
| | - Fiona D Johnston
- Evolution and Ecology Program, International Institute for Applied Systems Analysis (IIASA),Schlossplatz 1, A-2361, Laxenburg, Austria
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries,Müggelseedamm 310, Berlin, 12587, Germany
- Department for Crop and Animal Sciences, Faculty of Agriculture and Horticulture, Humboldt-Universität zu Berlin,Philippstrasse 13, Haus 7, 10115, Berlin, Germany
| | - Fabian Mollet
- Evolution and Ecology Program, International Institute for Applied Systems Analysis (IIASA),Schlossplatz 1, A-2361, Laxenburg, Austria
- Wageningen IMARES,Postbus 68, 1970, AB IJmuiden, The Netherlands
| | - Heidi Pardoe
- Faculty of Life and Environmental Sciences, MARICE, University of Iceland,Askja, Sturlugata 7, 101, Reykjavik, Iceland
| | - Nina O Therkildsen
- Section for Population Ecology and Genetics, National Institute of Aquatic Resources, Technical University of Denmark,Vejlsøvej 39, DK-8600, Silkeborg, Denmark
| | - Silva Uusi-Heikkilä
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries,Müggelseedamm 310, Berlin, 12587, Germany
- Division of Genetics and Physiology, Department of Biology, University of Turku,Pharmacity, FI-20014, Turku, Finland
| | - Anssi Vainikka
- Department of Biology, University of Oulu,PO Box 3000, FI-90014, Oulu, Finland
- Swedish Board of Fisheries, Institute of Coastal Research,PO Box 109, SE-74222, Öregrund, Sweden
| | - Mikko Heino
- Evolution and Ecology Program, International Institute for Applied Systems Analysis (IIASA),Schlossplatz 1, A-2361, Laxenburg, Austria
- Institute of Marine Research,PO Box 1870, Nordnes, NO-5817, Bergen, Norway
- EvoFish Research Group, Department of Biology, University of Bergen,Box 7803, NO-5020, Bergen, Norway
| | - Adriaan D Rijnsdorp
- Wageningen IMARES,Postbus 68, 1970, AB IJmuiden, The Netherlands
- Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University and Research Centre,PO Box 338, 6700, Wageningen, The Netherlands
| | - Ulf Dieckmann
- Evolution and Ecology Program, International Institute for Applied Systems Analysis (IIASA),Schlossplatz 1, A-2361, Laxenburg, Austria
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Festa-Bianchet M, Pelletier F, Jorgenson JT, Feder C, Hubbs A. Decrease in horn size and increase in age of trophy sheep in Alberta over 37 years. J Wildl Manage 2013. [DOI: 10.1002/jwmg.644] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Marco Festa-Bianchet
- Département de biologie and Centre d'Études Nordiques; Université de Sherbrooke; Sherbrooke QC Canada J1K 2R1
| | - Fanie Pelletier
- Département de biologie and Centre d'Études Nordiques; Université de Sherbrooke; Sherbrooke QC Canada J1K 2R1
| | - Jon T. Jorgenson
- Alberta Environment and Sustainable Resource Development; Suite 201 800 Railway Avenue Canmore Alberta Canada T1W 1P1
| | - Chiarastella Feder
- Alberta Environment and Sustainable Resource Development; Fish and Wildlife Division; 4919-51st Street Rocky Mountain House AB Canada T4T 1B3
| | - Anne Hubbs
- Alberta Environment and Sustainable Resource Development; Fish and Wildlife Division; 4919-51st Street Rocky Mountain House AB Canada T4T 1B3
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Abstract
Fish stocks experiencing high fishing mortality show a tendency to mature earlier and at a smaller size, which may have a genetic component and therefore long-lasting economic and biological effects. To date, the economic effects of such ecoevolutionary dynamics have not been empirically investigated. Using 70 y of data, we develop a bioeconomic model for Northeast Arctic cod to compare the economic yield in a model in which life-history traits can vary only through phenotypic plasticity with a model in which, in addition, genetic changes can occur. We find that evolutionary changes toward faster growth and earlier maturation occur consistently even if a stock is optimally managed. However, if a stock is managed optimally, the evolutionary changes actually increase economic yield because faster growth and earlier maturation raise the stock's productivity. The optimal fishing mortality is almost identical for the evolutionary and nonevolutionary model and substantially lower than what it has been historically. Therefore, the costs of ignoring evolution under optimal management regimes are negligible. However, if fishing mortality is as high as it has been historically, evolutionary changes may result in economic losses, but only if the fishery is selecting for medium-sized individuals. Because evolution facilitates growth, the fish are younger and still immature when they are susceptible to getting caught, which outweighs the increase in productivity due to fish spawning at an earlier age.
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Sharpe DMT, Wandera SB, Chapman LJ. Life history change in response to fishing and an introduced predator in the East African cyprinid Rastrineobola argentea. Evol Appl 2012; 5:677-93. [PMID: 23144655 PMCID: PMC3492894 DOI: 10.1111/j.1752-4571.2012.00245.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Accepted: 01/09/2012] [Indexed: 11/30/2022] Open
Abstract
Fishing and introduced species are among the most important stressors affecting freshwaters and can also be strong selective agents. We examined the combined effects of commercial fishing and an introduced predator (Nile perch, Lates niloticus) on life history traits in an African cyprinid fish (Rastrineobola argentea) native to the Lake Victoria basin in East Africa. To understand whether these two stressors have driven shifts in life history traits of R. argentea, we tested for associations between life history phenotypes and the presence/absence of stressors both spatially (across 10 Ugandan lakes) and temporally (over four decades in Lake Victoria). Overall, introduced Nile perch and fishing tended to be associated with a suite of life history responses in R. argentea, including: decreased body size, maturation at smaller sizes, and increased reproductive effort (larger eggs; and higher relative fecundity, clutch volume, and ovary weight). This is one of the first well-documented examples of fisheries-induced phenotypic change in a tropical, freshwater stock; the magnitude of which raises some concerns for the long-term sustainability of this fishery, now the most important (by mass) in Lake Victoria.
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Affiliation(s)
- Diana M T Sharpe
- Department of Biology, McGill University Montréal, Québec, Canada
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26
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Kendall NW, Quinn TP. Quantifying and comparing size selectivity among Alaskan sockeye salmon fisheries. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2012; 22:804-816. [PMID: 22645812 DOI: 10.1890/11-1189.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Quantifying long-term size-selective harvest patterns is necessary for understanding the potential evolutionary effects on exploited species. The comparison of fishery selection patterns on the same species subject to different gear types, in different areas, and over multi-decadal periods can reveal the factors influencing selection. In this study we quantified and compared size-selective harvest by nine Alaskan sockeye salmon (Oncorhynchus nerka) fisheries to understand overall patterns. We calculated length-specific linear selection differentials (the difference in average length of fish before vs. after fishing), which are produced by different combinations of exploitation rates and length-selectivity values, and nonlinear standardized differentials, describing disruptive selection, across all years for each fishery. Selection differentials varied among years, but larger fish were caught in 73% of years for males and 84% of years for females, leaving smaller fish to spawn. Disruptive selection was observed on female and male fish in 84% and 92% of years, respectively. Linear selection was stronger on females than males in 77% of years examined, and disruptive selection was stronger on males in 71% of years. Selection pressure was influenced by a combination of factors under and beyond management control; analyses using mixed-effects models indicated that fisheries were less size selective in years when fish were larger than average and had lower exploitation rates. The observed harvest of larger than average sockeye salmon is consistent with the hypothesis that size-selective fishing contributes to decreasing age and length at maturation trends over time, but temporal variability in selection and strong disruptive selection suggests that the overall directional pressure is weaker than is often assumed in evolutionary models.
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Affiliation(s)
- Neala W Kendall
- School of Aquatic and Fishery Sciences, University of Washington, Box 355020, Seattle, Washington 98195, USA.
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Kuparinen A, Hardie DC, Hutchings JA. Evolutionary and ecological feedbacks of the survival cost of reproduction. Evol Appl 2011; 5:245-55. [PMID: 25568045 DOI: 10.1111/j.1752-4571.2011.00215.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 10/11/2011] [Indexed: 11/30/2022] Open
Abstract
Arguably the most fundamental of trade-offs in life-history evolution is the increase in natural mortality resulting from sexual maturity and reproduction. Despite its central importance, this increase in mortality, a survival cost, garners surprisingly little attention in fish and fisheries modeling studies. We undertook an exploratory analysis to evaluate the consequences of this omission for life-history projections. To this end, we developed a simulation approach that integrates quantitative genetics into the ecological dynamics of a fish population and parameterized the model for Atlantic cod (Gadus morhua, L.). When compared to simulations in which the mortality of immature and mature individuals is equal, the inclusion of a survival cost results in larger asymptotic body size, older age at maturity, and larger size at maturity. We also find that measures of population productivity (spawning stock biomass, recruits-per-spawner) are overestimated if the survival cost is excluded. This sensitivity of key metrics of population growth rate and reproductive capacity to the magnitude of the survival cost of reproduction underscores the need to explicitly account for this trade-off in projections of fish population responses to natural and anthropogenic environmental change, including fisheries.
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Affiliation(s)
- Anna Kuparinen
- Ecological Genetics Research Unit, Department of Biosciences, University of Helsinki Helsinki, Finland
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Rocklin D, Tomasini JA, Culioli JM, Pelletier D, Mouillot D. Spearfishing regulation benefits artisanal fisheries: the ReGS indicator and its application to a multiple-use Mediterranean marine protected area. PLoS One 2011; 6:e23820. [PMID: 21966357 PMCID: PMC3179461 DOI: 10.1371/journal.pone.0023820] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Accepted: 07/28/2011] [Indexed: 11/26/2022] Open
Abstract
The development of fishing efficiency coupled with an increase of fishing effort led to the overexploitation of numerous natural marine resources. In addition to this commercial pressure, the impact of recreational activities on fish assemblages remains barely known. Here we examined the impact of spearfishing limitation on resources in a marine protected area (MPA) and the benefit it provides for the local artisanal fishery through the use of a novel indicator. We analysed trends in the fish assemblage composition using artisanal fisheries data collected in the Bonifacio Strait Natural Reserve (BSNR), a Mediterranean MPA where the spearfishing activity has been forbidden over 15% of its area. Fish species were pooled into three response groups according to their target level by spearfishing. We developed the new flexible ReGS indicator reflecting shifts in species assemblages according to the relative abundance of each response group facing external pressure. The catch per unit effort (CPUE) increased by ca. 60% in the BSNR between 2000 and 2007, while the MPA was established in 1999. The gain of CPUE strongly depended on the considered response group: for the highly targeted group, the CPUE doubled while the CPUE of the untargeted group increased by only 15.5%. The ReGS value significantly increased from 0.31 to 0.45 (on a scale between 0 and 1) in the general perimeter of this MPA while it has reached a threshold of 0.43, considered as a reference point, in the area protected from spearfishing since 1982. Our results demonstrated that limiting recreational fishing by appropriate zoning in multiple-use MPAs represents a real benefit for artisanal fisheries. More generally we showed how our new indicator may reveal a wide range of impacts on coastal ecosystems such as global change or habitat degradation.
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Affiliation(s)
- Delphine Rocklin
- Laboratoire Ecologie des Systèmes Marins Côtiers, UMR CNRS-UM2-IRD-IFREMER 5119, Université Montpellier 2, Montpellier, France.
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Swain DP. Life-history evolution and elevated natural mortality in a population of Atlantic cod (Gadus morhua). Evol Appl 2010; 4:18-29. [PMID: 25567950 PMCID: PMC3352523 DOI: 10.1111/j.1752-4571.2010.00128.x] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2010] [Accepted: 04/06/2010] [Indexed: 11/29/2022] Open
Abstract
Fisheries-induced evolution has been hypothesized to delay the recovery of collapsed fish stocks through effects on their productivity. The cod stock in the southern Gulf of St. Lawrence (SGSL) collapsed in the early 1990s and has shown no recovery since then, due mainly to high natural mortality of adult cod. Age and size at maturation of SGSL cod decreased sharply over time in cohorts produced in the 1950s and 1960s, likely reflecting an evolutionary response to intensified fishing, and have remained low since then, despite severe reductions in fishing mortality over the past 15 years. A predicted consequence of early maturation is increased natural mortality due to higher costs to reproduction. Early maturation may be a cause of increases in natural mortality of SGSL cod in the 1970s but does not appear to be related to the much larger increases since then. Instead, the current high natural mortality of SGSL cod appears to be primarily a cause, rather than a consequence, of the continued early maturation in this population, now replacing fishing mortality as the agent of selection favouring early maturity. This striking example of the failure to reverse fisheries-induced evolution by relaxing fishing pressure emphasizes the need for management strategies that minimize the chances of harvest-induced genetic change.
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Affiliation(s)
- Douglas P Swain
- Fisheries and Oceans Canada, Gulf Fisheries Centre Moncton, NB, Canada
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Tseng M, Bernatchez L. Editorial: 2009 in review. Evol Appl 2010; 3:93-5. [PMID: 25567909 PMCID: PMC3352473 DOI: 10.1111/j.1752-4571.2010.00122.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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