Ken H. Andersen
- Published in print:
- 2019
- Published Online:
- January 2020
- ISBN:
- 9780691192956
- eISBN:
- 9780691189260
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691192956.003.0013
- Subject:
- Biology, Aquatic Biology
This chapter outlines four future research questions where the size- and trait-based theory can be applied: stochasticity, behavioral ecology, coupling to primary production, and thermal ecology and ...
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This chapter outlines four future research questions where the size- and trait-based theory can be applied: stochasticity, behavioral ecology, coupling to primary production, and thermal ecology and climate change. The chapter first argues that differences in growth can be modeled with the size-based framework by introducing stochasticity into the feeding interaction. Next, the chapter contends that the behavioral response to food and predation risk has potentially big implications for community dynamics because it changes a key element in the model—namely, the interaction between individuals. On the matter of production, the chapter demonstrates that changing the carrying capacity or the productivity of the resource changes the food environment for the fish and that changes in the primary–secondary production would also have an impact on the carrying capacity of the stock-recruitment relation. Finally, the chapter looks at how increasing temperatures affect fish populations and communities on at least two time scales: on the short term is the direct physiological response to a temperature increase in terms of increasing metabolic demands. On the longer time scale is the ecological response where some species in a community will be replaced by other, better adapted, species.Less
This chapter outlines four future research questions where the size- and trait-based theory can be applied: stochasticity, behavioral ecology, coupling to primary production, and thermal ecology and climate change. The chapter first argues that differences in growth can be modeled with the size-based framework by introducing stochasticity into the feeding interaction. Next, the chapter contends that the behavioral response to food and predation risk has potentially big implications for community dynamics because it changes a key element in the model—namely, the interaction between individuals. On the matter of production, the chapter demonstrates that changing the carrying capacity or the productivity of the resource changes the food environment for the fish and that changes in the primary–secondary production would also have an impact on the carrying capacity of the stock-recruitment relation. Finally, the chapter looks at how increasing temperatures affect fish populations and communities on at least two time scales: on the short term is the direct physiological response to a temperature increase in terms of increasing metabolic demands. On the longer time scale is the ecological response where some species in a community will be replaced by other, better adapted, species.
Ken H. Andersen
- Published in print:
- 2019
- Published Online:
- January 2020
- ISBN:
- 9780691192956
- eISBN:
- 9780691189260
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691192956.003.0006
- Subject:
- Biology, Aquatic Biology
This chapter develops a basic evolutionary impact assessment of fishing. It does so by combining the size-based theory developed in chapters 3 and 4 with classic quantitative genetics. The impact ...
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This chapter develops a basic evolutionary impact assessment of fishing. It does so by combining the size-based theory developed in chapters 3 and 4 with classic quantitative genetics. The impact assessment estimated the selection responses resulting from size-selective fishing on three main life-history traits: size at maturation, growth rate, and investment in reproduction. The predicted selection responses from a fishing mortality comparable to Fmsy are on the order of magnitude of 0.1 percent per year, smallest for size at maturation and largest for the investment in reproduction. The responses increase roughly proportional to the fishing mortality, so overfishing will not only result in depleted stocks and suboptimal yield production, but it will also lead to faster fisheries-induced evolution.Less
This chapter develops a basic evolutionary impact assessment of fishing. It does so by combining the size-based theory developed in chapters 3 and 4 with classic quantitative genetics. The impact assessment estimated the selection responses resulting from size-selective fishing on three main life-history traits: size at maturation, growth rate, and investment in reproduction. The predicted selection responses from a fishing mortality comparable to Fmsy are on the order of magnitude of 0.1 percent per year, smallest for size at maturation and largest for the investment in reproduction. The responses increase roughly proportional to the fishing mortality, so overfishing will not only result in depleted stocks and suboptimal yield production, but it will also lead to faster fisheries-induced evolution.
