4.5 Article

Portfolio theory as a management tool to guide conservation and restoration of multi-stock fish populations

期刊

ECOSPHERE
卷 6, 期 12, 页码 -

出版社

WILEY
DOI: 10.1890/ES15-00237.1

关键词

early life stages; ecosystem-based fisheries management; Great Lakes; Lake Erie; population demographics; Sander vitreus; stock discrimination; walleye

类别

资金

  1. National Oceanic and Atmospheric Administration [NA090AR4170182]
  2. Federal Aid in Sport Fish Restoration Program [F-69-P]
  3. U.S. Fish and Wildlife Service [FADR67, FADR68, FADR70]
  4. ODNR-DOW [FADR67, FADR68, FADR70]
  5. Great Lakes Restoration Initiative Project Template 70 Developing Fish Habitat Enhancement Strategies for the Huron-Erie Corridor
  6. USGS Great Lakes Science Center

向作者/读者索取更多资源

Habitat degradation and harvest have upset the natural buffering mechanism (i.e., portfolio effects) of many large-scale multi-stock fisheries by reducing spawning stock diversity that is vital for generating population stability and resilience. The application of portfolio theory offers a means to guide management activities by quantifying the importance of multi-stock dynamics and suggesting conservation and restoration strategies to improve naturally occurring portfolio effects. Our application of portfolio theory to Lake Erie Sander vitreus (walleye), a large population that is supported by riverine and open-lake reef spawning stocks, has shown that portfolio effects generated by annual inter-stock larval fish production are currently suboptimal when compared to potential buffering capacity. Reduced production from riverine stocks has resulted in a single open-lake reef stock dominating larval production, and in turn, high inter-annual recruitment variability during recent years. Our analyses have shown (1) a weak average correlation between annual river and reef larval production ((rho) over bar = 0.24), suggesting that a natural buffering capacity exists in the population, and (2) expanded annual production of larvae (potential recruits) from riverine stocks could stabilize the fishery by dampening inter-annual recruitment variation. Ultimately, our results demonstrate how portfolio theory can be used to quantify the importance of spawning stock diversity and guide management on ecologically relevant scales (i.e., spawning stocks) leading to greater stability and resilience of multi-stock populations and fisheries.

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