Brown_etal2008_(Darwin_fish_sci).pdf (251.11 kB)
Darwinian fisheries science needs to consider realistic fishing pressures over evolutionary time scales
journal contribution
posted on 2023-05-26, 15:25 authored by Brown, CJ, Hobday, AJ, Philippe ZieglerPhilippe Ziegler, Welsford, DCThe apparently intense selective differentials imposed by many fisheries may drive the rapid evolution of growth rates. In a widely-cited laboratory experiment, Conover & Munch (2002; Science 297:94‚Äö-96) found considerable evolutionary change in the size of harvested fish over 4 generations. Their empirical model has since been used to estimate the impact of fishery-driven evolution on fishery sustainability. Using a mathematical, individual-based model (IBM) that simulates that experiment, we showed that the selection imposed in the Conover & Munch (2002) model is unrealistically strong when compared to harvest rates in wild fisheries. We inferred the evolutionary change that could be expected over the timescale used by Conover & Munch (2002), had they simulated more realistic harvest regimes, and found that the magnitude in their original experiment was 2.5 to 5 times greater. However, over evolutionary timescales of 30 generations and with realistic fishing pressure, the results of Conover & Munch (2002) are comparable to wild fisheries. This simulation result provides support for the use of empirical models to predict the impacts of fishery-driven evolution on yields and sustainability. Future models should consider the timing of fishing events, the trade-off between size, maturation and growth, and density-dependent effects for a comprehensive analysis of the consequences of fishery-driven evolution.
History
Publication title
Marine Ecology Progress SeriesVolume
369Pagination
257-266ISSN
0171-8630 / 1616-1599Publication status
- Published
Rights statement
Copyright Copyright 2008 InterResearchRepository Status
- Open
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