Fishing effects on age and spatial structures undermine population stability of fishes

Chih hao Hsieh, Atsushi Yamauchi, Takefumi Nakazawa, Wei Fen Wang

研究成果: Review article同行評審

134 引文 斯高帕斯(Scopus)

摘要

Overfishing has caused dramatic changes in structures of exploited populations as well as ecosystems. In this article, we focus on fishing effects on age (size) and spatial structures of exploited fishes. Accumulating evidence has shown that large and experienced spawning individuals are able to produce higher quality and quantity of eggs, known as maternal effects, and that individuals of different age classes tend to spawn in different locations and times. These behaviors are associated with a healthy age structure and contribute to bet-hedging capacity that is important in smoothing out short-term environmental variability. Here, we document a widespread phenomenon of age (size)-truncation of exploited populations driven by size-selective fishery removals. Such size-selective fishing may have evolutionary consequence and may be difficult to reverse. In addition, fishing often reduces population spatial heterogeneity that also contributes importantly to bet-hedging. We review studies showing that the effects of age truncation and reduction of spatial heterogeneity have reduced resilience and elevated the fluctuation amplitude of exploited populations facing a changing environment. Recent analyses indicated that fish populations often exhibit nonlinear nature and have potential to shift dramatically in a short time. All the evidence suggests that fishing, by altering age or spatial structures, may make exploited fishes, more prone to catastrophic shifts. Therefore, to achieve sustainable fisheries, management should conserve the age and spatial structure in addition to viable spawning biomass.

原文English
頁(從 - 到)165-178
頁數14
期刊Aquatic Sciences
72
發行號2
DOIs
出版狀態Published - 2010

All Science Journal Classification (ASJC) codes

  • 生態學、進化論、行為學與系統學
  • 海洋科學
  • 生態學
  • 水科學與技術

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