1
|
Deng Q, Zhang X, Zhao Z, Tang W. Conservation and restoration of riverine spawning habitats require fine-scale functional connectivity and functional heterogeneity. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 857:159571. [PMID: 36273565 DOI: 10.1016/j.scitotenv.2022.159571] [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: 08/04/2022] [Revised: 10/09/2022] [Accepted: 10/15/2022] [Indexed: 06/16/2023]
Abstract
A severe extinction crisis of migratory fish caused by extensive hydropower development and climate change has attracted widespread environmental concern. Conserving and restoring riverine spawning habitat for migratory species is advantageous for population recovery. Depending on the reproductive characteristics of fish with adhesive eggs, functionally heterogeneous spawning habitats are required to support different stages of reproductive activity. However, few aquatic assessment models are available to consider the fine-scale functional connectivity between heterogeneous spawning habitats. This study developed a function-based framework that linked fine-scale functional connectivity modeling to habitat quality evaluations for the population recovery of migratory fish. The function path tree (FPT) model within the framework could identified the spatiotemporal dynamics of fine-scale connectivity patterns by emphasizing the attribute-dependence of patch arrangements. Here, we used the Chinese sturgeon, a well-known endangered anadromous fish producing adhesive eggs in the Yangtze River, as an example to demonstrate the applicability of the framework. Additionally, the ecological effectiveness of river restorations to overcome the detrimental influence of climate change on discharge decrease was also investigated. Compared to prior research, our methodology effectively enhanced the predictive performance of spatiotemporal distributions and quality assessments of spawning habitats. A strong correlation was discovered between the ecological profit indicator (HQI) and the estimated fecundity (R2 = 0.941) and field-collected eggs (R2 = 0.918). The minimum spawning discharge decreased from 8400 m3/s to 7000 m3/s by substrate restoration, with the optimal HQI growth rate of 52.7 % at Q < 8400 m3/s. This work will optimize long-term conservation for imperiled migratory species and help develop strategies to build resilience to ongoing environmental changes in flow-reduced rivers.
Collapse
Affiliation(s)
- Qing Deng
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
| | - Xinhua Zhang
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China.
| | - Zhizhou Zhao
- College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China
| | - Wei Tang
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
| |
Collapse
|
2
|
Zheng Y, Li X, Liu P, Chen Y, Guo C. The Armor of the Chinese Sturgeon: A Study of the Microstructure and Mechanical Properties of the Ventral Bony Plates. MICROMACHINES 2023; 14:256. [PMID: 36837956 PMCID: PMC9959584 DOI: 10.3390/mi14020256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/15/2023] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
Benefiting from their unique morphological characteristics and structural properties, the ventral bony plates of the Chinese sturgeon are excellent biological protective tissue. In this work, we studied the micro- and macro-morphology and mechanical properties of the ventral bony plates of the Chinese sturgeon to elucidate the special protective mechanisms of the bony plates. Experiments involving scanning electron microscopy and energy-dispersive X-ray spectroscopy revealed that the bony plates possess a hierarchical structure and a ridge-like shape. This structure comprises a surface layer containing mineralized nanocrystals and an internal layer containing mineralized collagen fibers. From the surface layer to the internal layer, the degree of mineralization decreases gradually. Nanoindentation, tension, and compression tests demonstrated that the bony plates feature excellent mechanical properties and a high specific tensile strength comparable to that of stainless steel. Moreover, water can significantly improve the fracture toughness and deformability of the bony plates and effectively enhance the damage tolerance of the structures. The obtained results concerning the microstructure-property-function relationships of the ventral bony plates of the Chinese sturgeon may provide novel insights for designing protective structures that are both lightweight and high strength.
Collapse
Affiliation(s)
- Yu Zheng
- College of Mechanical and Electrical Engineering, Suqian University, Suqian 223800, China
| | - Xin Li
- College of Mechanical and Electrical Engineering, Suqian University, Suqian 223800, China
| | - Ping Liu
- College of Mechanical and Electrical Engineering, Suqian University, Suqian 223800, China
| | - Ying Chen
- College of Mechanical and Electrical Engineering, Suqian University, Suqian 223800, China
| | - Ce Guo
- Institute of Bio-Inspired Structure and Surface Engineering, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| |
Collapse
|
3
|
Managing Water Level for Large Migratory Fish at the Poyang Lake Outlet: Implications Based on Habitat Suitability and Connectivity. WATER 2022. [DOI: 10.3390/w14132076] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
River–lake interaction is important for maintaining biodiversity, yet it is vulnerable to hydrological alteration. The connectivity of the channel connecting Poyang Lake and the Yangtze River not only ensures the regular migration of fish but also makes Poyang Lake a feeding and fattening ground for them. Unfortunately, human activities have dramatically changed the hydrodynamic conditions of Poyang Lake, which is experiencing severe drought due to the obvious decline in the water level in autumn and winter, especially since 2003. However, the possible impacts of the changes in the water level on the habitats of migratory fish remain unclear due to the limitation of traditional techniques in spatiotemporal analysis. Here, we combined a hydrodynamic model and habitat suitability model to simulate variations in the suitable habitat area and their connectivity under different water-level conditions. The conditions for the migration pathway of the target fish were obtained by a hydroacoustic survey using the Simrad EY60 echosounder. The results showed that the change in water level will significantly affect the spatiotemporal change in the suitable habitats and their connectivity. In particular, we found the existence of two thresholds that play a dominant role in illuminating the connectivity of effective suitable habitats (HC). Firstly, the maximum value of the weighted usable area (WUA) and HC can be achieved when the water level is more than 16 m. Secondly, when the water level is between 10 and 16 m, the changes in the HC are sensitive and rapid, and the area flooded at this stage is called the sensitive area. HC is a crucial element in fish migration and habitat conditions. Under the condition of continuous drought in the middle reaches of the Yangtze River, our research contributes to clarifying the influence of water level on key habitats for fish and optimizes the practice of river–lake ecological management.
Collapse
|
4
|
Zheng Y, Guo C, Li L, Ma Y. Unique morphology and mechanical property of Chinese sturgeon (Acipenser sinensis) fish skin. IET Nanobiotechnol 2020; 14:281-288. [DOI: 10.1049/iet-nbt.2019.0297] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Yu Zheng
- Institute of Bio‐inspired Structure and Surface EngineeringCollege of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016People's Republic of China
| | - Ce Guo
- Institute of Bio‐inspired Structure and Surface EngineeringCollege of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016People's Republic of China
| | - Longhai Li
- Institute of Bio‐inspired Structure and Surface EngineeringCollege of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016People's Republic of China
| | - Yaopeng Ma
- Institute of Bio‐inspired Structure and Surface EngineeringCollege of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016People's Republic of China
| |
Collapse
|
5
|
Huang Z. Drifting with Flow versus Self-Migrating-How Do Young Anadromous Fish Move to the Sea? iScience 2019; 19:772-785. [PMID: 31494493 PMCID: PMC6734002 DOI: 10.1016/j.isci.2019.08.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 07/18/2019] [Accepted: 08/19/2019] [Indexed: 12/03/2022] Open
Abstract
The downriver migration process of young anadromous fish has a far-reaching impact on their survival rate and the efficacy of hatchery-reared fish release, but it is poorly understood. Moreover, the impact of dams on the fish remains unclear. The Chinese sturgeon is an anadromous and dam-affected fish in the Yangtze River. Here, we propose a novel theoretical framework to reveal the migration process of young Chinese sturgeon. We clarify the effects of active swimming of fish and water flow on the downriver migration and the parametric traits of the migrational stages. Then, we show that the young fish migrate downriver along the inshore waters in a gradually transforming manner from passive drift to active swimming. Lastly, we evaluate the impact of the Gezhouba Dam (GD) on the migration of the young fish, as well as demonstrate the life cycles of Chinese sturgeon in the Yangtze River pre- and post-GD. The migration process of young fish depends on their age and the local water flow Weak swing or swimming of larvae plays a crucial role in fish survival in the river Young fish move in a gradually transforming manner—passive drift to active swimming The Dam causes juveniles to reach the estuary earlier, which pose a mortality risk
Collapse
Affiliation(s)
- Zhenli Huang
- China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
| |
Collapse
|
6
|
Zhang H, Kang M, Wu J, Wang C, Li J, Du H, Yang H, Wei Q. Increasing River Temperature Shifts Impact the Yangtze Ecosystem: Evidence from the Endangered Chinese Sturgeon. Animals (Basel) 2019; 9:ani9080583. [PMID: 31434296 PMCID: PMC6720547 DOI: 10.3390/ani9080583] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 08/13/2019] [Accepted: 08/14/2019] [Indexed: 11/24/2022] Open
Abstract
Simple Summary A river thermal regime is critically influencing the aquatic ecosystem and human-induced water temperature alteration occurs commonly worldwide. In large river systems, thermal alterations do not readily arise because of the huge water volume. The Yangtze River has the third greatest water flow, is the third longest river, and is one of the most human-influenced rivers in the world. Here, we found that the entire water temperature regime in the Yangtze River has been changed by damming and will shift further under future dam construction. We think that this, in conjunction with the impacts of global warming, means that saving the Chinese sturgeon by regulating water temperature is critically difficult. Also, river thermal shifts not only threaten fish but also affect the whole Yangtze aquatic ecosystem. Abstract The Yangtze River has the third greatest water flow and is one of the most human-influenced rivers in the world. Since 1950, this river system has experienced drastic human interventions, leading to various environmental changes, including water temperature. In this study, based on observations during the past sixty years, we found that the seasonal temperature regime has been altered, both temporally (1–5 °C variation) and spatially (>626 km distance). Temperature shifts not only delay the timing of fish spawning directly, but also lead to degeneration in gonad development. Temperature regime alterations have delayed the suitable spawning temperature window by approximately 29 days over a decade (2003–2016). It confirmed that a period of lower temperature, higher cumulative temperature, and relatively higher temperature differences promoted the maturation of potential spawners based on the correlation analysis (p < 0.05). Also, thermal alterations were highly correlated with reservoir capacity upstream (R2 = 0.866). On-going cascade dam construction and global warming will lead to further temperature shifts. Currently, rigorous protection measures on the breeding population of the Chinese sturgeon and its critical habitats is urgently needed to prevent the crisis of the species extinction. Increasing river thermal shifts not only threaten the Chinese sturgeon but also affect the entire Yangtze aquatic ecosystem.
Collapse
Affiliation(s)
- Hui Zhang
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture and Rural Affairs of P. R. China, Wuhan 430223, Hubei Province, China.
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, Hubei Province, China.
| | - Myounghee Kang
- Department of Maritime Police and Production System, The Institute of Marine Industry, Gyeongsang National University, Tongyeong-si 53064, Gyeongsangnam-do, Korea
| | - Jinming Wu
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture and Rural Affairs of P. R. China, Wuhan 430223, Hubei Province, China
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, Hubei Province, China
| | - Chengyou Wang
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture and Rural Affairs of P. R. China, Wuhan 430223, Hubei Province, China
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, Hubei Province, China
| | - Junyi Li
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture and Rural Affairs of P. R. China, Wuhan 430223, Hubei Province, China
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, Hubei Province, China
| | - Hao Du
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture and Rural Affairs of P. R. China, Wuhan 430223, Hubei Province, China
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, Hubei Province, China
| | - Haile Yang
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture and Rural Affairs of P. R. China, Wuhan 430223, Hubei Province, China
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, Hubei Province, China
| | - Qiwei Wei
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture and Rural Affairs of P. R. China, Wuhan 430223, Hubei Province, China.
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, Hubei Province, China.
| |
Collapse
|
7
|
Zheng Y, Guo C, Li L, Ma Y. Morphology and mechanical properties of the dorsal bony plates in the Chinese sturgeon (
Acipenser sinensis
). Microsc Res Tech 2019; 82:1083-1091. [DOI: 10.1002/jemt.23256] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 01/20/2019] [Accepted: 03/02/2019] [Indexed: 11/06/2022]
Affiliation(s)
- Yu Zheng
- College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and Astronautics Nanjing, 210016 China
- Institute of Bio‐inspired Structure and Surface EngineeringNanjing University of Aeronautics and Astronautics Nanjing, 210016 China
| | - Ce Guo
- College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and Astronautics Nanjing, 210016 China
- Institute of Bio‐inspired Structure and Surface EngineeringNanjing University of Aeronautics and Astronautics Nanjing, 210016 China
| | - Longhai Li
- College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and Astronautics Nanjing, 210016 China
- Institute of Bio‐inspired Structure and Surface EngineeringNanjing University of Aeronautics and Astronautics Nanjing, 210016 China
| | - Yaopeng Ma
- College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and Astronautics Nanjing, 210016 China
- Institute of Bio‐inspired Structure and Surface EngineeringNanjing University of Aeronautics and Astronautics Nanjing, 210016 China
| |
Collapse
|
8
|
Huang Z, Wang L. Yangtze Dams Increasingly Threaten the Survival of the Chinese Sturgeon. Curr Biol 2018; 28:3640-3647.e18. [DOI: 10.1016/j.cub.2018.09.032] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 07/26/2018] [Accepted: 09/13/2018] [Indexed: 10/28/2022]
|
9
|
Monitoring seasonal distribution of an endangered anadromous sturgeon in a large river using environmental DNA. Naturwissenschaften 2018; 105:62. [PMID: 30306348 DOI: 10.1007/s00114-018-1587-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 09/20/2018] [Accepted: 09/20/2018] [Indexed: 10/28/2022]
Abstract
Monitoring dynamic distribution is crucial to conservation management of anadromous sturgeons, but traditional survey methods are less efficient for low-density populations in a large river. Natural propagation of Chinese sturgeon has been monitored annually mainly at the spawning ground using netting for eggs and hydroacoustics for broodstock. However, absence of spawning was observed sporadically in recent years, indicating further crises for the declining population. We analyzed eDNA of water samples collected from 24 sites across 1360 km of the migratory route of anadromous Chinese sturgeon in the middle and lower reaches of the Yangtze River. Chinese sturgeon was detected at 9 sites during the spawning season and 14 sites after the spawning season. We found that positive eDNA detection rates remained constant in the middle reaches but dramatically changed in the lower reaches, reflecting seasonal migration pattern of Chinese sturgeon. Invasive sturgeons were detected in the river, indicating their possible escape from aquaculture facilities. This study established a protocol for the use of eDNA to monitor distribution of Chinese sturgeon and could be valuable in making better policies for the conservation of this endangered species.
Collapse
|
10
|
Xi MD, Li P, Du H, Qiao XM, Liu ZG, Wei WQ. Geranylgeranylacetone induction of HSP90α exerts cryoprotective effect on Acipenser sinensis sperm. Anim Reprod Sci 2018; 193:19-25. [PMID: 29724523 DOI: 10.1016/j.anireprosci.2018.03.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 03/21/2018] [Accepted: 03/27/2018] [Indexed: 10/17/2022]
Abstract
Heat Shock Protein 90 (HSP90) is a fertility-associated protein, the expression of which positively correlates with sperm quality in many species. Geranylgeranylacetone (GGA) is reported to induce expression of HSP90. The present study aimed to investigate whether GGA induced expression of HSP90 in Acipenser sinensis sperm to exert a cryoprotective effect. Sperm from five male A. sinensis was combined with extender containing 20 mmol/L tris pH = 8.1, 10% v/v methanol, 2-5 mmol/L KCl, 15 mmol/L lactose, and 15 mmol/L trehalose, with GGA at 0, 14, 67, 135, 673, 1346, or 6731 μmol/L. After cryopreservation and thawing, the percentage of motile spermatozoa, spermatozoon curvilinear velocity (VCL), straight-line velocity (VSL), average path velocity (VAP), acrosome integrity, and membrane integrity, as well as fertility were evaluated. Sperm quality increased with the increase of GGA to 673 μmol/L, but decreased at higher concentrations. Expression levels of HSP90α were detected by Western blot in sperm frozen with GGA at 673 μmol/L (highest obtained sperm quality), 6731 μmol/L (highest GGA concentration), and a control without GGA. The expression of HSP90α increased with the increase in GGA, with lowest expression observed in the control. GGA was found to induce increase of HSP90α, and this increase was associated with higher quality cryopreserved sperm at concentrations ≤673 μmol/L. This research suggests a viable technique to increase the quality of cryopreserved A. sinensis sperm by adding GGA to induce expression of HSP90α.
Collapse
Affiliation(s)
- Meng Dan Xi
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Science, Beijing 100049, China; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Ping Li
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China; Sino-Czech Joint Laboratory for Fish Conservation and Biotechnology, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China; University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zátiší 728/II, 389 25 Vodňany, Czech Republic
| | - Hao Du
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China; Sino-Czech Joint Laboratory for Fish Conservation and Biotechnology, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Xin Mei Qiao
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China; Sino-Czech Joint Laboratory for Fish Conservation and Biotechnology, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Zhi Gang Liu
- Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China; Sino-Czech Joint Laboratory for Fish Conservation and Biotechnology, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Wei Qi Wei
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China; Sino-Czech Joint Laboratory for Fish Conservation and Biotechnology, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China.
| |
Collapse
|
11
|
Yoshioka H. A simple game-theoretic model for upstream fish migration. Theory Biosci 2017; 136:99-111. [PMID: 28470443 DOI: 10.1007/s12064-017-0244-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 04/25/2017] [Indexed: 11/24/2022]
Abstract
A simple game-theoretic model for upstream fish migration, which is a key element in life history of diadromous fishes, is proposed. Foundation of the model is a minimization problem on the cost of migration with the swimming speed and school size as the variables to be simultaneously optimized. Finding the optimizer ultimately reduces to solving a self-consistency equation without explicit solutions. Mathematical analytical results lead to the sufficient condition that the self-consistency equation has a unique solution, which turns out to be identified with the condition where the unique optimizer exists. Behavior of the optimizer is analyzed both mathematically and numerically to show its biophysical and ecological consequences. The analytical results demonstrate reasonable agreement between the present mathematical model and the theoretical and experimental results of upstream migration of fish schools reported in the past research.
Collapse
Affiliation(s)
- Hidekazu Yoshioka
- Faculty of Life and Environmental Science, Shimane University, Nishikawatsu-cho 1060, Matsue, Shimane, 690-8504, Japan.
| |
Collapse
|
12
|
Koster WM, Dawson DR, Liu C, Moloney PD, Crook DA, Thomson JR. Influence of streamflow on spawning-related movements of golden perch Macquaria ambigua in south-eastern Australia. JOURNAL OF FISH BIOLOGY 2017; 90:93-108. [PMID: 27734494 DOI: 10.1111/jfb.13160] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 08/30/2016] [Indexed: 06/06/2023]
Abstract
In this study, linkages were examined between movement and spawning behaviour for golden perch Macquaria ambigua in a lowland river by integrating acoustic telemetry and egg and larval drift sampling over 4 years. Movement was strongly seasonal, being most prevalent during the spawning season (spring to early summer), and occurred primarily downstream into the lower river reaches during elevated flows. A very strong association was found between the occurrence of spawning and long-distance M. ambigua movement. The results also revealed that targeted environmental water allocation can promote movement and spawning of this species. By integrating multiple analytical approaches and focusing on key life-history events, this study provides an improved picture of the life history and flow requirements of M. ambigua. The findings can help guide the development of effective environmental flow recommendations.
Collapse
Affiliation(s)
- W M Koster
- Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, 123 Brown Street, Heidelberg, VIC, 3084, Australia
| | - D R Dawson
- Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, 123 Brown Street, Heidelberg, VIC, 3084, Australia
| | - C Liu
- Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, 123 Brown Street, Heidelberg, VIC, 3084, Australia
| | - P D Moloney
- Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, 123 Brown Street, Heidelberg, VIC, 3084, Australia
| | - D A Crook
- Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, 123 Brown Street, Heidelberg, VIC, 3084, Australia
| | - J R Thomson
- Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, 123 Brown Street, Heidelberg, VIC, 3084, Australia
| |
Collapse
|
13
|
Nelson TC, Doukakis P, Lindley ST, Schreier AD, Hightower JE, Hildebrand LR, Whitlock RE, Webb MAH. Research tools to investigate movements, migrations, and life history of sturgeons (Acipenseridae), with an emphasis on marine-oriented populations. PLoS One 2013; 8:e71552. [PMID: 23990959 PMCID: PMC3750015 DOI: 10.1371/journal.pone.0071552] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 07/02/2013] [Indexed: 11/18/2022] Open
Abstract
Worldwide, sturgeons (Acipenseridae) are among the most endangered fishes due to habitat degradation, overfishing, and inherent life history characteristics (long life span, late maturation, and infrequent spawning). As most sturgeons are anadromous, a considerable portion of their life history occurs in estuarine and marine environments where they may encounter unique threats (e.g., interception in non-target fisheries). Of the 16 marine-oriented species, 12 are designated as Critically Endangered by the IUCN, and these include species commercially harvested. We review important research tools and techniques (tagging, electronic tagging, genetics, microchemistry, observatory) and discuss the comparative utility of these techniques to investigate movements, migrations, and life-history characteristics of sturgeons. Examples are provided regarding what the applications have revealed regarding movement and migration and how this information can be used for conservation and management. Through studies that include Gulf (Acipenser oxyrinchus desotoi) and Green Sturgeon (A. medirostris), we illustrate what is known about well-studied species and then explore lesser-studied species. A more complete picture of migration is available for North American sturgeon species, while European and Asian species, which are among the most endangered sturgeons, are less understood. We put forth recommendations that encourage the support of stewardship initiatives to build awareness and provide key information for population assessment and monitoring.
Collapse
Affiliation(s)
- Troy C. Nelson
- Fraser River Sturgeon Conservation Society, Vancouver, British Columbia, Canada
- * E-mail:
| | - Phaedra Doukakis
- Scripps Institution of Oceanography, University of California San Diego, San Diego, California, United States of America
| | - Steven T. Lindley
- National Marine Fisheries Service, Southwest Fisheries Science Center, Santa Cruz, California, United States of America
| | - Andrea D. Schreier
- Department of Animal Science, University of California Davis, Davis, California, United States of America
| | - Joseph E. Hightower
- U. S. Geological Survey, NC Cooperative Fish and Wildlife Research Unit, Department of Applied Ecology, NC State University, Raleigh, North Carolina, United States of America
| | | | - Rebecca E. Whitlock
- Stanford University, Hopkins Marine Station, Pacific Grove, California, United States of America
| | - Molly A. H. Webb
- U. S. Fish and Wildlife Service, Bozeman Fish Technology Center, Bozeman, Montana, United States of America
| |
Collapse
|
14
|
Metcalfe J, Craig JF. Fish migration in the 21st century: opportunities and challenges. JOURNAL OF FISH BIOLOGY 2012; 81:361-364. [PMID: 22803714 DOI: 10.1111/j.1095-8649.2012.03388.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
|