Darwinian fisheries science needs to consider realistic fishing pressures over evolutionary time scales

Marine Ecology Progress Series

Philippe E. Ziegler¹  Dirk C. Welsford¹  Alistair J. Hobday¹  Christopher J. Brown¹ 

关键词: Fishery-driven evolution;    Evolution;    Fisheries;    Heritability;    Life history;    Selection;    Individual-based model;   

DOI  :  10.3354/meps07601

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: The 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 297:94–96) 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.

【 授权许可】

Unknown