1
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McGrane-Corrigan B, Mason O, de Andrade Moral R. Inferring stochastic group interactions within structured populations via coupled autoregression. J Theor Biol 2024; 584:111793. [PMID: 38492917 DOI: 10.1016/j.jtbi.2024.111793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 03/04/2024] [Accepted: 03/11/2024] [Indexed: 03/18/2024]
Abstract
The internal behaviour of a population is an important feature to take account of when modelling its dynamics. In line with kin selection theory, many social species tend to cluster into distinct groups in order to enhance their overall population fitness. Temporal interactions between populations are often modelled using classical mathematical models, but these sometimes fail to delve deeper into the, often uncertain, relationships within populations. Here, we introduce a stochastic framework that aims to capture the interactions of animal groups and an auxiliary population over time. We demonstrate the model's capabilities, from a Bayesian perspective, through simulation studies and by fitting it to predator-prey count time series data. We then derive an approximation to the group correlation structure within such a population, while also taking account of the effect of the auxiliary population. We finally discuss how this approximation can lead to ecologically realistic interpretations in a predator-prey context. This approximation also serves as verification to whether the population in question satisfies our various assumptions. Our modelling approach will be useful for empiricists for monitoring groups within a conservation framework and also theoreticians wanting to quantify interactions, to study cooperation and other phenomena within social populations.
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Affiliation(s)
- Blake McGrane-Corrigan
- Department of Mathematics and Statistics, Maynooth University, Maynooth, Kildare, Ireland.
| | - Oliver Mason
- Department of Mathematics and Statistics, Maynooth University, Maynooth, Kildare, Ireland
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2
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Evans LC, Burgess MD, Potts SG, Kunin WE, Oliver TH. Population links between an insectivorous bird and moths disentangled through national-scale monitoring data. Ecol Lett 2024; 27:e14362. [PMID: 38253060 DOI: 10.1111/ele.14362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 10/30/2023] [Accepted: 12/08/2023] [Indexed: 01/24/2024]
Abstract
Insects are key components of food chains, and monitoring data provides new opportunities to identify trophic relationships at broad spatial and temporal scales. Here, combining two monitoring datasets from Great Britain, we reveal how the population dynamics of the blue tit Cyanistes caeruleus are influenced by the abundance of moths - a core component of their breeding diet. We find that years with increased population growth for blue tits correlate strongly with high moth abundance, but population growth in moths and birds is less well correlated; suggesting moth abundance directly affects bird population change. Next, we identify moths that are important components of blue tit diet, recovering associations to species previously identified as key food sources such as the winter moth Operoptera brumata. Our work provides new evidence that insect abundance impacts bird population dynamics in natural communities and provides insight into spatial diet turnover at a national-scale.
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Affiliation(s)
| | | | - Simon G Potts
- Centre for Agri-Environmental Research, School of Agriculture, Policy and Development, University of Reading, Reading, UK
| | | | - Tom H Oliver
- School of Biological Sciences, University of Reading, Reading, UK
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3
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Nsengimana O, Walker FM, Webala PW, Twizeyimana I, Dusabe MC, Sanchez DE, Sobek CJ, Ruhagazi D, Iribagiza P, Muvunyi R, Medellin RA. Our good neighbors: Understanding ecosystem services provided by insectivorous bats in Rwanda. PLoS One 2023; 18:e0287536. [PMID: 37352304 PMCID: PMC10289311 DOI: 10.1371/journal.pone.0287536] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 06/07/2023] [Indexed: 06/25/2023] Open
Abstract
Bats are prodigious consumers of agricultural and forest pests, and are, therefore, a natural asset for agricultural productivity, suppressing populations of such pests. This study provides baseline information of diet of 143 bats belonging to eight insectivorous bat species from agricultural areas of Rwanda while evaluating the effectiveness of bats as pest suppressors. Using DNA metabarcoding to analyze bat fecal pellets, 85 different insect species were detected, with 60% (n = 65), 64% (n = 11) and 78% (n = 9) found to be agricultural pests from eastern, northern and western regions, respectively. Given the high percentages of agricultural pests detected, we submit that Rwandan insectivorous bats have the capacity for biocontrol of agricultural pests. Rwandan bat populations should be protected and promoted since they may foster higher crop yields and sustainable livelihoods.
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Affiliation(s)
| | - Faith M. Walker
- Bat Ecology & Genetics Lab, School of Forestry, Northern Arizona University, Flagstaff, Arizona, United States of America
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, Arizona, United States of America
| | - Paul W. Webala
- Department of Forestry and Wildlife Management, Maasai Mara University, Narok, Kenya
| | | | | | - Daniel E. Sanchez
- Bat Ecology & Genetics Lab, School of Forestry, Northern Arizona University, Flagstaff, Arizona, United States of America
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, Arizona, United States of America
| | - Colin J. Sobek
- Bat Ecology & Genetics Lab, School of Forestry, Northern Arizona University, Flagstaff, Arizona, United States of America
- The Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, Arizona, United States of America
| | - Deo Ruhagazi
- Rwanda Wildlife Conservation Association, Kigali, Rwanda
| | | | | | - Rodrigo A. Medellin
- Institute of Ecology, National Autonomous University of Mexico, Mexico City, Mexico
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4
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Vettorazzi M, Mogensen N, Kaelo B, Broekhuis F. Understanding the effects of seasonal variation in prey availability on prey switching by large carnivores. J Zool (1987) 2022. [DOI: 10.1111/jzo.13013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- M. Vettorazzi
- Wildlife Ecology and Conservation Group Wageningen University and Research Wageningen The Netherlands
| | - N. Mogensen
- Mara Predator Conservation Programme Kenya Wildlife Trust Nairobi Kenya
| | - B. Kaelo
- Mara Predator Conservation Programme Kenya Wildlife Trust Nairobi Kenya
| | - F. Broekhuis
- Wildlife Ecology and Conservation Group Wageningen University and Research Wageningen The Netherlands
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5
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Abstract
This article reviews the nature of functional responses that have commonly been used to represent feeding relationships in the ecological literature. It compares these with the range of functional response forms that are likely to characterize species in natural communities. The latter set of responses involves many more variables. The article reviews the history of functional response models, and examines previous work that has allowed the functional response of a predator to a single type of prey to depend on additional variables beyond the abundance of that prey type. While a number of more complex functional responses have been discussed over the years, many variables affecting feeding rates are still typically omitted from models of food webs. The influences on functional responses from trophic levels above that of the predator or below that of the prey are particularly likely to be ignored, although models and data have suggested that they can have large effects on the functional response. The influences of adaptive behavior and of the time-scale of response measurement are also too often ignored. Some of the known and unknown consequences of these omissions are discussed.
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6
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Gutiérrez Al‐Khudhairy OU, Rossberg AG. Evolution of prudent predation in complex food webs. Ecol Lett 2022; 25:1055-1074. [PMID: 35229972 PMCID: PMC9540554 DOI: 10.1111/ele.13979] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 11/03/2021] [Accepted: 12/17/2021] [Indexed: 01/09/2023]
Abstract
Prudent predators catch sufficient prey to sustain their populations but not as much as to undermine their populations' survival. The idea that predators evolve to be prudent has been dismissed in the 1970s, but the arguments invoked then are untenable in the light of modern evolution theory. The evolution of prudent predation has repeatedly been demonstrated in two-species predator-prey metacommunity models. However, the vigorous population fluctuations that these models predict are not widely observed. Here we show that in complex model food webs prudent predation evolves as a result of consumer-mediated ('apparent') competitive exclusion of resources, which disadvantages aggressive consumers and does not generate such fluctuations. We make testable predictions for empirical signatures of this mechanism and its outcomes. Then we discuss how these predictions are borne out across freshwater, marine and terrestrial ecosystems. Demonstrating explanatory power of evolved prudent predation well beyond the question of predator-prey coexistence, the predicted signatures explain unexpected declines of invasive alien species, the shape of stock-recruitment relations of fish, and the clearance rates of pelagic consumers across the latitudinal gradient and 15 orders of magnitude in body mass. Specific research to further test this theory is proposed.
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Affiliation(s)
| | - Axel G. Rossberg
- School of Biological and Behavioural SciencesQueen Mary University of LondonLondonUK
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7
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Berkhout BW, Morozov A. Assassin snails (Anentome helena) as a biological model for exploring the effects of individual specialisation within generalist predators. PLoS One 2022; 17:e0264996. [PMID: 35286318 PMCID: PMC8920249 DOI: 10.1371/journal.pone.0264996] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 02/21/2022] [Indexed: 11/26/2022] Open
Abstract
Quantifying feeding behaviour of generalist predators at the population and individual levels is crucial for understanding the structure and functioning of food webs. Individual predator/consumer feeding niches can be significantly narrower than that of the population across animal taxa. In such species, the population of a generalist predator becomes essentially an ensemble of specialist individuals and this often highly affects the dynamics of the prey-predator interactions. Currently, few experimental systems exist that are both easily technically manipulated in a lab and are reliable to accurately assess effects of individual specialisation within generalist predators. Here we argue that a freshwater predaceous snail, Anentome helena (also known as an ‘assassin snail’), is a convenient and reliable experimental system to study feeding of a generalist predator on multiple food types which exhibits well-pronounced specialisation of foraging individuals. Using A. helena we experimentally test: (i) how relative prey abundances in the environment affect the feeding patterns, (ii) whether the feeding patterns are consistent over the duration of the experimental period, and (iii) compare the feeding niche breadth of individuals to that of the laboratory population. By offering four different prey snail species, at a range of relative abundances, we show that there are consistent patterns in feeding. Importantly, the consumption of each prey was independent of the relative abundance at which they were present. Individual predators showed selectivity to a particular prey, i.e. the population of assassin snails seems to be formed of individuals that specialise on different prey. Our findings would contribute to the recent revision and the ongoing debate on the classification of predator species into generalists and specialists.
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Affiliation(s)
- Boris W. Berkhout
- Department of Genetics and Genome Biology, University of Leicester, United Kingdom
- * E-mail:
| | - Andrew Morozov
- Department of Mathematics, University of Leicester, United Kingdom
- Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia
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8
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Arias M, Leroy L, Madec C, Matos L, Tedore C, Elias M, Gomez D. Partial wing transparency works better when disrupting wing edges: Evidence from a field experiment. J Evol Biol 2021; 34:1840-1846. [PMID: 34601773 DOI: 10.1111/jeb.13943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 09/04/2021] [Accepted: 09/19/2021] [Indexed: 11/28/2022]
Abstract
Lepidoptera-a group of insects in which wing transparency has arisen multiple times-exhibits much variation in the size and position of transparent wing zones. However, little is known as to how this variability affects detectability. Here, we test how the size and position of transparent elements affect the predation of artificial moths by wild birds in the field. Morphs with transparent elements touching wing borders showed a reduced predation risk, with the effect being the same regardless of the number of wing borders being touched. By contrast, transparent element size had little to no effect on predation risk. Overall, this experiment shows for the first time that transparency offers higher protection when it disrupts prey contour in terrestrial habitats.
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Affiliation(s)
- Mónica Arias
- CEFE, CNRS, Univ. Montpellier, EPHE, IRD, Montpellier, France.,ISYEB, CNRS, MNHN, Sorbonne Univ, EPHE, Univ. Antilles, 45 rue Buffon CP50, Paris, France
| | - Lucie Leroy
- CEFE, CNRS, Univ. Montpellier, EPHE, IRD, Montpellier, France
| | - Clément Madec
- CEFE, CNRS, Univ. Montpellier, EPHE, IRD, Montpellier, France
| | - Louane Matos
- CEFE, CNRS, Univ. Montpellier, EPHE, IRD, Montpellier, France
| | - Cynthia Tedore
- CEFE, CNRS, Univ. Montpellier, EPHE, IRD, Montpellier, France.,Faculty of Mathematics, Informatics and Natural Sciences, Institute of Zoology, Univ. Hamburg, Hamburg, Germany
| | - Marianne Elias
- ISYEB, CNRS, MNHN, Sorbonne Univ, EPHE, Univ. Antilles, 45 rue Buffon CP50, Paris, France
| | - Doris Gomez
- CEFE, CNRS, Univ. Montpellier, EPHE, IRD, Montpellier, France.,INSP, CNRS, Sorbonne Univ., Paris, France
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9
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Qin D, Liu B, Zhang P, Zheng Q, Luo P, Ye C, Zhao W, Zhang Z. Treating green pea aphids, Myzus persicae, with azadirachtin affects the predatory ability and protective enzyme activity of harlequin ladybirds, Harmonia axyridis. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 212:111984. [PMID: 33517036 DOI: 10.1016/j.ecoenv.2021.111984] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 01/20/2021] [Accepted: 01/24/2021] [Indexed: 06/12/2023]
Abstract
As a natural enemy of green peach aphids, harlequin ladybirds, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), are also indirectly affected by azadirachtin. In this study, we evaluated the effects of ladybird exposure to azadirachtin through azadirachtin-treated aphids. About 2 mg/L azadirachtin treated aphid can deliver the azadirachtin to ladybird larvae in 12 and 24 h. And azadirachtin treatment affected the rate at which fourth instar larvae and adult ladybirds preyed on aphids. Furthermore, the antifeedant effect increased with increasing azadirachtin concentrations. Twelve hours after exposing fourth instar ladybird larvae to aphids treated with 10 mg/L azadirachtin, the antifeedant effect was 47.70%. Twelve hours after exposing adult ladybirds to aphids treated with 2 mg/L azadirachtin, the antifeedant effect was 67.49%. Forty-eight hours after exposing ladybird larvae to azadirachtin-treated aphids, their bodyweights were 8.37 ± 0.044 mg (2 mg/L azadirachtin), 3.70 ± 0.491 mg (10 mg/L azadirachtin), and 2.39 ± 0.129 mg (50 mg/L azadirachtin). Treatment with azadirachtin affected the ability of ladybirds to prey on aphids. The results indicated that the instant attack rate of ladybird larvae and adults and the daily maximum predation rate were reduced by azadirachtin treatment. Superoxide dismutase (SOD), peroxidase (POD), and peroxide (CAT) enzyme activities of ladybirds were affected after feeding on aphids treated with azadirachtin. Azadirachtin has certain antifeedant effects on ladybirds and affects the ability of ladybirds to prey on aphids and the activities of SOD, POD, and CAT enzymes, which results in inhibition of normal body development.
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Affiliation(s)
- Deqiang Qin
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Benju Liu
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Peiwen Zhang
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Qun Zheng
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Peiru Luo
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Cuiyi Ye
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Weihua Zhao
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China
| | - Zhixiang Zhang
- Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, 510642, China.
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10
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Ansmann G, Bollenbach T. Building clone-consistent ecosystem models. PLoS Comput Biol 2021; 17:e1008635. [PMID: 33556059 PMCID: PMC7895417 DOI: 10.1371/journal.pcbi.1008635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 02/19/2021] [Accepted: 12/15/2020] [Indexed: 11/18/2022] Open
Abstract
Many ecological studies employ general models that can feature an arbitrary number of populations. A critical requirement imposed on such models is clone consistency: If the individuals from two populations are indistinguishable, joining these populations into one shall not affect the outcome of the model. Otherwise a model produces different outcomes for the same scenario. Using functional analysis, we comprehensively characterize all clone-consistent models: We prove that they are necessarily composed from basic building blocks, namely linear combinations of parameters and abundances. These strong constraints enable a straightforward validation of model consistency. Although clone consistency can always be achieved with sufficient assumptions, we argue that it is important to explicitly name and consider the assumptions made: They may not be justified or limit the applicability of models and the generality of the results obtained with them. Moreover, our insights facilitate building new clone-consistent models, which we illustrate for a data-driven model of microbial communities. Finally, our insights point to new relevant forms of general models for theoretical ecology. Our framework thus provides a systematic way of comprehending ecological models, which can guide a wide range of studies.
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Affiliation(s)
- Gerrit Ansmann
- Institute for Biological Physics, University of Cologne, Cologne, Germany
- * E-mail:
| | - Tobias Bollenbach
- Institute for Biological Physics, University of Cologne, Cologne, Germany
- Center for Data and Simulation Science, University of Cologne, Cologne, Germany
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11
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Preedy KF, Chaplain MAJ, Leybourne DJ, Marion G, Karley AJ. Learning-induced switching costs in a parasitoid can maintain diversity of host aphid phenotypes although biocontrol is destabilized under abiotic stress. J Anim Ecol 2020; 89:1216-1229. [PMID: 32096554 DOI: 10.1111/1365-2656.13189] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 12/01/2019] [Indexed: 11/27/2022]
Abstract
Aphid populations frequently include phenotypes that are resistant to parasitism by hymenopterous parasitoid wasps, which is often attributed to the presence of 'protective' facultative endosymbionts residing in aphid tissues, particularly Hamiltonella defensa. In field conditions, under parasitoid pressure, the observed coexistence of aphids with and without protective symbionts cannot be explained by their difference in fitness alone. Using the cereal aphid Rhopalosiphum padi as a model, we propose an alternative mechanism whereby parasitoids are more efficient at finding common phenotypes of aphid and experience a fitness cost when switching to the less common phenotype. We construct a model based on delay differential equations and parameterize and validate the model with values within the ranges obtained from experimental studies. We then use it to explore the possible effects on system dynamics under conditions of environmental stress, using our existing data on the effects of drought stress in crops as an example. We show the 'switching penalty' incurred by parasitoids leads to stable coexistence of aphids with and without H. defensa and provides a potential mechanism for maintaining phenotypic diversity among host organisms. We show that drought-induced reduction in aphid development time has little impact. However, greater reduction in fecundity on droughted plants of symbiont-protected aphids can cause insect population cycles when the system would be stable in the absence of drought stress. The stabilizing effect of the increased efficiency in dealing with more commonly encountered host phenotypes is applicable to a broad range of consumer-resource systems and could explain stable coexistence in competitive environments. The loss of stable coexistence when drought has different effects on the competing aphid phenotypes highlights the importance of scenario testing when considering biocontrol for pest management.
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Affiliation(s)
| | - Mark A J Chaplain
- Department of Mathematics and Statistics, University of St Andrews, St Andrews, UK
| | | | - Glenn Marion
- Biomathematics and Statistics Scotland, Edinburgh, UK
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12
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Fincham WNW, Dunn AM, Brown LE, Hesketh H, Roy HE. Invasion success of a widespread invasive predator may be explained by a high predatory efficacy but may be influenced by pathogen infection. Biol Invasions 2019. [DOI: 10.1007/s10530-019-02067-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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13
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Ho HC, Tylianakis JM, Zheng JX, Pawar S. Predation risk influences food-web structure by constraining species diet choice. Ecol Lett 2019; 22:1734-1745. [PMID: 31389145 DOI: 10.1111/ele.13334] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 05/23/2019] [Accepted: 06/09/2019] [Indexed: 01/24/2023]
Abstract
The foraging behaviour of species determines their diet and, therefore, also emergent food-web structure. Optimal foraging theory (OFT) has previously been applied to understand the emergence of food-web structure through a consumer-centric consideration of diet choice. However, the resource-centric viewpoint, where species adjust their behaviour to reduce the risk of predation, has not been considered. We develop a mechanistic model that merges metabolic theory with OFT to incorporate the effect of predation risk on diet choice to assemble food webs. This 'predation-risk-compromise' (PR) model better captures the nestedness and modularity of empirical food webs relative to the classical optimal foraging model. Specifically, compared with optimal foraging alone, risk-mitigated foraging leads to more-nested but less-modular webs by broadening the diet of consumers at intermediate trophic levels. Thus, predation risk significantly affects food-web structure by constraining species' ability to forage optimally, and needs to be considered in future work.
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Affiliation(s)
- Hsi-Cheng Ho
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, SL5 7PY, UK
| | - Jason M Tylianakis
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, SL5 7PY, UK.,School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, NZ
| | - Jonathan X Zheng
- Department of Electrical and Electronic Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Samraat Pawar
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, SL5 7PY, UK
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14
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Piltz SH, Harhanen L, Porter MA, Maini PK. Inferring parameters of prey switching in a 1 predator-2 prey plankton system with a linear preference tradeoff. J Theor Biol 2018; 456:108-122. [PMID: 30009794 DOI: 10.1016/j.jtbi.2018.07.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 06/29/2018] [Accepted: 07/06/2018] [Indexed: 01/31/2023]
Abstract
We construct two ordinary-differential-equation models of a predator feeding adaptively on two prey types, and we evaluate the models' ability to fit data on freshwater plankton. We model the predator's switch from one prey to the other in two different ways: (i) smooth switching using a hyperbolic tangent function; and (ii) by incorporating a parameter that changes abruptly across the switching boundary as a system variable that is coupled to the population dynamics. We conduct linear stability analyses, use approximate Bayesian computation (ABC) combined with a population Monte Carlo (PMC) method to fit model parameters, and compare model results quantitatively to data for ciliate predators and their two algal prey groups collected from Lake Constance on the German-Swiss-Austrian border. We show that the two models fit the data well when the smooth transition is steep, supporting the simplifying assumption of a discontinuous prey-switching behavior for this scenario. We thus conclude that prey switching is a possible mechanistic explanation for the observed ciliate-algae dynamics in Lake Constance in spring, but that these data cannot distinguish between the details of prey switching that are encoded in these different models.
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Affiliation(s)
- Sofia H Piltz
- Department of Applied Mathematics and Computer Science, Technical University of Denmark, Asmussens allé, Bygning 303B, Kongens Lyngby 2800, Denmark; Department of Mathematics, University of Michigan, 2074 East Hall, Ann Arbor, MI 48109-1043, USA.
| | - Lauri Harhanen
- Department of Applied Mathematics and Computer Science, Technical University of Denmark, Asmussens allé, Bygning 303B, Kongens Lyngby 2800, Denmark
| | - Mason A Porter
- Department of Mathematics, University of California, Los Angeles, Los Angeles, CA 90095, USA; Oxford Centre for Industrial and Applied Mathematics, Mathematical Institute, University of Oxford, Andrew Wiles Building, Radcliffe Observatory Quarter, Woodstock Road, Oxford OX2 6GG, UK; CABDyN Complexity Centre, University of Oxford, Oxford OX1 1HP, UK
| | - Philip K Maini
- Wolfson Centre for Mathematical Biology, Mathematical Institute, University of Oxford, Andrew Wiles Building, Radcliffe Observatory Quarter, Woodstock Road, Oxford OX2 6GG, UK; CABDyN Complexity Centre, University of Oxford, Oxford OX1 1HP, UK
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15
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Bellavance V, Bélisle M, Savage J, Pelletier F, Garant D. Influence of agricultural intensification on prey availability and nestling diet in Tree Swallows (Tachycineta bicolor). CAN J ZOOL 2018. [DOI: 10.1139/cjz-2017-0229] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Over the last decades, aerial insectivorous birds have been declining in both North America and Europe. Those declines have been hypothetically attributed to a decrease in prey availability caused by agricultural intensification, but empirical evidence remains scarce. Here, we quantify the effect of landscape composition on the abundance and diversity of potential prey of Tree Swallows (Tachycineta bicolor (Vieillot, 1808)) and on nestling diet in southern Quebec, Canada. We collected food boluses from nestlings and compared their composition with spatiotemporally corresponding samples from traps on farms distributed along a gradient of agricultural intensification. The diet of nestlings was mostly composed of Diptera, both in biomass and abundance, but by mid-June, these decreased with increasing proportions of intensively cultivated crops within 500 m of the nests. Trap catches for Diptera and all arthropods combined followed the same trends. Yet, the associations between Diptera subgroups (Nematocera, non-schizophoran Brachycera, Schizophora (Calyptratae), and Schizophora (Acalyptratae)) and landscape composition differed between traps and boluses, suggesting that prey selection was altered by agricultural intensification. Our results suggest that agriculture can alter the availability of preferred prey for aerial insectivores, and further studies should evaluate the impact of prey availability to explain the decline of aerial insectivores.
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Affiliation(s)
- V. Bellavance
- Département de biologie, Université de Sherbrooke, 2500 boulevard de l’Université, Sherbrooke, QC J1K 2R1, Canada
- Biology Department, Bishop’s University, 2600 College Street, Sherbrooke, QC J1M 1Z7, Canada
| | - M. Bélisle
- Département de biologie, Université de Sherbrooke, 2500 boulevard de l’Université, Sherbrooke, QC J1K 2R1, Canada
| | - J. Savage
- Biology Department, Bishop’s University, 2600 College Street, Sherbrooke, QC J1M 1Z7, Canada
| | - F. Pelletier
- Département de biologie, Université de Sherbrooke, 2500 boulevard de l’Université, Sherbrooke, QC J1K 2R1, Canada
| | - D. Garant
- Département de biologie, Université de Sherbrooke, 2500 boulevard de l’Université, Sherbrooke, QC J1K 2R1, Canada
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16
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Holmes IA, Grundler MR, Davis Rabosky AR. Predator Perspective Drives Geographic Variation in Frequency-Dependent Polymorphism. Am Nat 2017; 190:E78-E93. [PMID: 28937812 DOI: 10.1086/693159] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Color polymorphism in natural populations can manifest as a striking patchwork of phenotypes in space, with neighboring populations characterized by dramatic differences in morph composition. These geographic mosaics can be challenging to explain in the absence of localized selection because they are unlikely to result from simple isolation-by-distance or clinal variation in selective regimes. To identify processes that can lead to the formation of geographic mosaics, we developed a simulation-based model to explore the influence of predator perspective, selection, migration, and genetic linkage of color loci on allele frequencies in polymorphic populations over space and time. Using simulated populations inspired by the biology of Heliconius longwing butterflies, Cepaea land snails, Oophaga poison frogs, and Sonora ground snakes, we found that the relative sizes of predator and prey home ranges can produce large differences in morph composition between neighboring populations under both positive and negative frequency-dependent selection. We also demonstrated the importance of the interaction of predator perspective with the type of frequency dependence and localized directional selection across migration and selection intensities. Our results show that regional-scale predation can promote the formation of phenotypic mosaics in prey species, without the need to invoke spatial variation in selective regimes. We suggest that predator behavior can play an important and underappreciated role in the formation and maintenance of geographic mosaics in polymorphic species.
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17
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Penk M, Saul W, Dick JT, Donohue I, Alexander ME, Linzmaier S, Jeschke JM. A trophic interaction framework for identifying the invasive capacity of novel organisms. Methods Ecol Evol 2017. [DOI: 10.1111/2041-210x.12817] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marcin Penk
- School of Natural SciencesTrinity College Dublin Dublin Ireland
- Department of Biology, Chemistry, PharmacyInstitute of BiologyFreie Universität Berlin Berlin Germany
| | - Wolf‐Christian Saul
- Department of Biology, Chemistry, PharmacyInstitute of BiologyFreie Universität Berlin Berlin Germany
- Leibniz‐Institute of Freshwater Ecology and Inland Fisheries (IGB) Berlin Germany
- Berlin‐Brandenburg Institute of Advanced Biodiversity Research (BBIB) Berlin Germany
- Centre for Invasion Biology (CIB)Department of Botany and Zoology & Department of Mathematical SciencesStellenbosch University Matieland South Africa
| | - Jaimie T.A. Dick
- Institute for Global Food SecuritySchool of Biological SciencesQueen's University Belfast Belfast UK
| | - Ian Donohue
- School of Natural SciencesTrinity College Dublin Dublin Ireland
| | - Mhairi E. Alexander
- Institute for Biomedical and Environmental Health Research (IBEHR)School of Science and SportUniversity of the West of Scotland Paisley UK
| | - Stefan Linzmaier
- Department of Biology, Chemistry, PharmacyInstitute of BiologyFreie Universität Berlin Berlin Germany
- Leibniz‐Institute of Freshwater Ecology and Inland Fisheries (IGB) Berlin Germany
- Berlin‐Brandenburg Institute of Advanced Biodiversity Research (BBIB) Berlin Germany
| | - Jonathan M. Jeschke
- Department of Biology, Chemistry, PharmacyInstitute of BiologyFreie Universität Berlin Berlin Germany
- Leibniz‐Institute of Freshwater Ecology and Inland Fisheries (IGB) Berlin Germany
- Berlin‐Brandenburg Institute of Advanced Biodiversity Research (BBIB) Berlin Germany
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18
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McMurray SE, Pawlik JR, Finelli CM. Demography alters carbon flux for a dominant benthic suspension feeder, the giant barrel sponge, on Conch Reef, Florida Keys. Funct Ecol 2017. [DOI: 10.1111/1365-2435.12908] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Steven E. McMurray
- Department of Biology and Marine Biology University of North Carolina Wilmington Wilmington NC USA
| | - Joseph R. Pawlik
- Department of Biology and Marine Biology University of North Carolina Wilmington Wilmington NC USA
| | - Christopher M. Finelli
- Department of Biology and Marine Biology University of North Carolina Wilmington Wilmington NC USA
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19
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Tallian A, Smith DW, Stahler DR, Metz MC, Wallen RL, Geremia C, Ruprecht J, Wyman CT, MacNulty DR. Predator foraging response to a resurgent dangerous prey. Funct Ecol 2017. [DOI: 10.1111/1365-2435.12866] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aimee Tallian
- Department of Wildland Resources & Ecology Center Utah State University 5230 Old Main Hill Logan UT84322 USA
| | - Douglas W. Smith
- Yellowstone Center for Resources Yellowstone National Park Box 168 Mammoth Hot Springs WY82190 USA
| | - Daniel R. Stahler
- Yellowstone Center for Resources Yellowstone National Park Box 168 Mammoth Hot Springs WY82190 USA
| | - Matthew C. Metz
- Yellowstone Center for Resources Yellowstone National Park Box 168 Mammoth Hot Springs WY82190 USA
- Wildlife Biology Program Department of Ecosystem and Conservation Sciences University of Montana Missoula MT59812 USA
| | - Rick L. Wallen
- Yellowstone Center for Resources Yellowstone National Park Box 168 Mammoth Hot Springs WY82190 USA
| | - Chris Geremia
- Yellowstone Center for Resources Yellowstone National Park Box 168 Mammoth Hot Springs WY82190 USA
| | - Joel Ruprecht
- Department of Fisheries and Wildlife Oregon State University 104 Nash Hall Corvallis OR97331 USA
| | - C. Travis Wyman
- Yellowstone Center for Resources Yellowstone National Park Box 168 Mammoth Hot Springs WY82190 USA
| | - Daniel R. MacNulty
- Department of Wildland Resources & Ecology Center Utah State University 5230 Old Main Hill Logan UT84322 USA
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20
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Application of diet theory reveals context-dependent foraging preferences in an herbivorous coral reef fish. Oecologia 2017; 184:127-137. [DOI: 10.1007/s00442-017-3855-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 03/18/2017] [Indexed: 11/24/2022]
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21
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Materassi M, Innocenti G, Berzi D, Focardi S. Kleptoparasitism and complexity in a multi-trophic web. ECOLOGICAL COMPLEXITY 2017. [DOI: 10.1016/j.ecocom.2016.12.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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22
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Bistability induced by generalist natural enemies can reverse pest invasions. J Math Biol 2017; 75:543-575. [PMID: 28097417 DOI: 10.1007/s00285-017-1093-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 10/18/2016] [Indexed: 10/20/2022]
Abstract
Analytical modeling of predator-prey systems has shown that specialist natural enemies can slow, stop and even reverse pest invasions, assuming that the prey population displays a strong Allee effect in its growth. We aimed to formalize the conditions in which spatial biological control can be achieved by generalists, through an analytical approach based on reaction-diffusion equations. Using comparison principles, we obtain sufficient conditions for control and for invasion, based on scalar bistable partial differential equations. The ability of generalist predators to control prey populations with logistic growth lies in the bistable dynamics of the coupled system, rather than in the bistability of prey-only dynamics as observed for specialist predators attacking prey populations displaying Allee effects. As a consequence, prey control is predicted to be possible when space is considered in additional situations other than those identified without considering space. The reverse situation is also possible. None of these considerations apply to spatial predator-prey systems with specialist natural enemies.
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23
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Johnson I, Brinkman T, Lake B, Brown C. Winter hunting behavior and habitat selection of wolves in a low-density prey system. WILDLIFE BIOLOGY 2017. [DOI: 10.2981/wlb.00290] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Ian Johnson
- I. Johnson , PO Box 750881, Fairbanks, AK 99775, USA
| | - Todd Brinkman
- T. Brinkman, PO Box 757000, Fairbanks, AK 99775, USA
| | - Bryce Lake
- B. Lake, 101 12th Ave, Fairbanks, AK 99701, USA
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24
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25
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Bates ML, Cropp RA, Hawker DW, Norbury J. Which functional responses preclude extinction in ecological population-dynamic models? ECOLOGICAL COMPLEXITY 2016. [DOI: 10.1016/j.ecocom.2016.03.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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26
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Jankovic M, Petrovskii S, Banerjee M. Delay driven spatiotemporal chaos in single species population dynamics models. Theor Popul Biol 2016; 110:51-62. [PMID: 27154920 DOI: 10.1016/j.tpb.2016.04.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 04/11/2016] [Accepted: 04/26/2016] [Indexed: 11/30/2022]
Abstract
Questions surrounding the prevalence of complex population dynamics form one of the central themes in ecology. Limit cycles and spatiotemporal chaos are examples that have been widely recognised theoretically, although their importance and applicability to natural populations remains debatable. The ecological processes underlying such dynamics are thought to be numerous, though there seems to be consent as to delayed density dependence being one of the main driving forces. Indeed, time delay is a common feature of many ecological systems and can significantly influence population dynamics. In general, time delays may arise from inter- and intra-specific trophic interactions or population structure, however in the context of single species populations they are linked to more intrinsic biological phenomena such as gestation or resource regeneration. In this paper, we consider theoretically the spatiotemporal dynamics of a single species population using two different mathematical formulations. Firstly, we revisit the diffusive logistic equation in which the per capita growth is a function of some specified delayed argument. We then modify the model by incorporating a spatial convolution which results in a biologically more viable integro-differential model. Using the combination of analytical and numerical techniques, we investigate the effect of time delay on pattern formation. In particular, we show that for sufficiently large values of time delay the system's dynamics are indicative to spatiotemporal chaos. The chaotic dynamics arising in the wake of a travelling population front can be preceded by either a plateau corresponding to dynamical stabilisation of the unstable equilibrium or by periodic oscillations.
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Affiliation(s)
- Masha Jankovic
- Department of Mathematics, University of Leicester, Leicester, UK
| | | | - Malay Banerjee
- Department of Mathematics and Statistics, IIT Kanpur, India
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27
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Ryabov AB, Morozov A, Blasius B. Imperfect prey selectivity of predators promotes biodiversity and irregularity in food webs. Ecol Lett 2015; 18:1262-1269. [PMID: 26391624 DOI: 10.1111/ele.12521] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 07/30/2015] [Accepted: 08/16/2015] [Indexed: 11/30/2022]
Abstract
Ecological communities are often characterised by many species occupying the same trophic level and competing over a small number of vital resources. The mechanisms maintaining high biodiversity in such systems are still poorly understood. Here, we revisit the role of prey selectivity by generalist predators in promoting biodiversity. We consider a generic tri-trophic food web, consisting of a single limiting resource, a large number of primary producers and a generalist predator. We suggest a framework to describe the predator functional response, combining food selectivity for distinctly different functional prey groups with proportion-based consumption of similar prey species. Our simulations reveal that intermediate levels of prey selectivity can explain a high species richness, functional biodiversity, and variability among prey species. In contrast, perfect food selectivity or purely proportion-based food consumption leads to a collapse of prey functional biodiversity. Our results are in agreement with empirical phytoplankton rank-abundance curves in lakes.
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Affiliation(s)
- Alexey B Ryabov
- University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Oldenburg, Germany
| | - Andrew Morozov
- Department of Mathematics, University of Leicester, Leicester, UK.,Shirshov Institute of Oceanology, RAS, Moscow, Russia
| | - Bernd Blasius
- University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Oldenburg, Germany
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28
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Ross BE, Hooten MB, DeVink JM, Koons DN. Combined effects of climate, predation, and density dependence on Greater and Lesser Scaup population dynamics. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2015; 25:1606-17. [PMID: 26552268 DOI: 10.1890/14-0582.1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
An understanding of species relationships is critical in the management and conservation of populations facing climate change, yet few studies address how climate alters species interactions and other population drivers. We use a long-term, broad-scale data set of relative abundance to examine the influence of climate, predators, and density dependence on the population dynamics of declining scaup (Aythya) species within the core of their breeding range. The state-space modeling approach we use applies to a wide range of wildlife species, especially populations monitored over broad spatiotemporal extents. Using this approach, we found that immediate snow cover extent in the preceding winter and spring had the strongest effects, with increases in mean snow cover extent having a positive effect on the local surveyed abundance of scaup. The direct effects of mesopredator abundance on scaup population dynamics were weaker, but the results still indicated a potentil interactive process between climate and food web dynamics (mesopredators, alternative prey, and scaup). By considering climate variables and other potential effects on population dynamics, and using a rigorous estimation framework, we provide insight into complex ecological processes for guiding. conservation and policy actions aimed at mitigating and reversing the decline of scaup.
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29
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Socolar J, Washburne A. Prey Carrying Capacity Modulates the Effect of Predation on Prey Diversity. Am Nat 2015; 186:333-47. [PMID: 26655352 DOI: 10.1086/682362] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Understanding the role of predation in regulating prey diversity is a major goal in ecology, with profound consequences for community dynamics, ecosystem structure, and conservation practice. Deterministic differential equation models predict that some predation regimes, such as prey-switching predation, should promote prey coexistence and increase prey diversity. However, such models do not capture stochastic population fluctuations that are ubiquitous in empirical study sites and nature reserves. In this article, we examine the effects of prey-switching predation on the species richness of prey communities with demographic noise. We show that in finite, discrete prey populations, the ability of prey-switching predation to promote diversity depends on the carrying capacity of the prey community and the richness of the source pool for prey. Identical predation regimes may have opposite effects on prey diversity depending on the size and productivity of the habitat or the metacommunity richness. Statistical properties of the fluctuations of prey populations determine the effect of stabilizing mechanisms on species richness. We discuss the implications of this result for empirical studies of predation in small study areas and for the management of small nature reserves.
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Affiliation(s)
- Jacob Socolar
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey 08544
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30
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Duan H, Zhang X. Phase transition of vortexlike self-propelled particles induced by a hostile particle. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 92:012701. [PMID: 26274197 DOI: 10.1103/physreve.92.012701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Indexed: 06/04/2023]
Abstract
When encountering a hostile particle, the avoidance behaviors of the vortex state of self-propelled particles exhibit phase transition phenomena such that the vortex state can change into a crystal state. Based on the self-propelled particle model and a molecular dynamics simulation, the dynamic response of the vortex swarm induced by a hostile particle (predator or obstacle) is studied. Three parameters are defined to characterize the collective escaping behaviors, including the order parameter, the flock size, and the roundness parameter. If a predator moves slower with a larger risk radius, the vortex swarm cannot return to its original vortex state, but rather transforms into a crystal state. The critical phase transition radius, the maximum risk radius of a predator with which the transition from a vortex to crystal state cannot take place, is also examined by considering the influence of the model parameters. To some degree, the critical radius reflects the stability and robustness of the vortex swarm.
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Affiliation(s)
- Haibin Duan
- Bio-inspired Autonomous Flight Systems (BAFS) Research Group, School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Xiangyin Zhang
- Bio-inspired Autonomous Flight Systems (BAFS) Research Group, School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, People's Republic of China
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31
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Liu F, Zeng F. The influence of nutritional history on the functional response of Geocoris pallidipennis to its prey, Myzus persicae. BULLETIN OF ENTOMOLOGICAL RESEARCH 2014; 104:702-706. [PMID: 24990177 DOI: 10.1017/s0007485314000509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Insect artificial diets are the foundation for mass production of insect predators. Whether there is an influence of long-term rearing with artificial diet on the control ability of predators should be considered. Here, we focused on the effect of nutritional history on the functional response of Geocoris pallidipennis to Myzus persicae. The influence of nutritional history (artificial diet versus natural prey, M. persicae) on the functional response of third to fifth instar nymphs and female G. pallidipennis was examined in the laboratory. The results showed that the functional response curve of both the nymphs and the adult female of G. pallidipennis to M. persicae reflected similar trends on both nutritional histories and confirmed the type II response. Adult female G. pallidipennis reared on either M. persicae or artificial diet produced a significantly better performance than the juvenile stages tested. We estimated that adult female G. pallidipennis can consume 141.6 (artificial diet) or 131.6 (M. persicae) aphids per day, respectively. This indicated that G. pallidipennis reared on both artificial diet and M. persicae displayed high rates of predation.
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Affiliation(s)
- F Liu
- Institute of Plant Protection,Chinese Academy of Agricultural Sciences,Beijing,People's Republic of China
| | - F Zeng
- Institute of Plant Protection,Chinese Academy of Agricultural Sciences,Beijing,People's Republic of China
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32
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Calcagno V, Grognard F, Hamelin FM, Wajnberg É, Mailleret L. The functional response predicts the effect of resource distribution on the optimal movement rate of consumers. Ecol Lett 2014; 17:1570-9. [PMID: 25331167 DOI: 10.1111/ele.12379] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 08/18/2014] [Accepted: 09/11/2014] [Indexed: 11/29/2022]
Abstract
Understanding how often individuals should move when foraging over patchy habitats is a central question in ecology. By combining optimality and functional response theories, we show analytically how the optimal movement rate varies with the average resource level (enrichment) and resource distribution (patch heterogeneity). We find that the type of functional response predicts the effect of enrichment in homogeneous habitats: enrichment should decrease movement for decelerating functional responses, but increase movement for accelerating responses. An intermediate resource level thus maximises movement for type-III responses. Counterintuitively, greater movement costs favour an increase in movement. In heterogeneous habitats predictions further depend on how enrichment alters the variance of resource distribution. Greater patch variance always increases the optimal rate of movement, except for type-IV functional responses. While the functional response is well established as a fundamental determinant of consumer-resource dynamics, our results indicate its importance extends to the understanding of individual movement strategies.
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Affiliation(s)
- Vincent Calcagno
- INRA, Institut Sophia Agrobiotech (ISA), 400 route des Chappes, Sophia Antipolis, France
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33
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Morozov A, Petrovskii S. Feeding on multiple sources: towards a universal parameterization of the functional response of a generalist predator allowing for switching. PLoS One 2013; 8:e74586. [PMID: 24086356 PMCID: PMC3783441 DOI: 10.1371/journal.pone.0074586] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 08/06/2013] [Indexed: 11/18/2022] Open
Abstract
Understanding of complex trophic interactions in ecosystems requires correct descriptions of the rate at which predators consume a variety of different prey species. Field and laboratory data on multispecies communities are rarely sufficient and usually cannot provide an unambiguous test for the theory. As a result, the conventional way of constructing a multi-prey functional response is speculative, and often based on assumptions that are difficult to verify. Predator responses allowing for prey selectivity and active switching are thought to be more biologically relevant compared to the standard proportion-based consumption. However, here we argue that the functional responses with switching may not be applicable to communities with a broad spectrum of resource types. We formulate a set of general rules that a biologically sound parameterization of a predator functional response should satisfy, and show that all existing formulations for the multispecies response with prey selectivity and switching fail to do so. Finally, we propose a universal framework for parameterization of a multi-prey functional response by combining patterns of food selectivity and proportion-based feeding.
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Affiliation(s)
- Andrew Morozov
- Department of Mathematics, University of Leicester, Leicester, United Kingdom
| | - Sergei Petrovskii
- Department of Mathematics, University of Leicester, Leicester, United Kingdom
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