| 摘要: |
| 本研究从刺网选择性对鱼类表型性状的影响入手, 应用数值模拟方法, 模拟了一个具有一定体长特征的鱼类种群, 利用具有多项选择参数( 曲线标准差σ, 最适体长l0, 选择性因素R0) 的刺网曲线对其进行长期捕捞作用, 并在去除捕捞的情况下探讨这种影响的稳定性。结果表明, 刺网捕捞作业长期作用于鱼类种群, 会对种群体长组成产生深远的影响, 开发率( E ) 越大, 效果越明显。当刺网最适捕捞体长与初始种群优势体长重合时( l0 = 15), 造成种群体长分布峰值的分化; 如果l0>15, 则导致种群体长组成向小型化方向偏移; 反之则会造成种群体长组成向大型化方向偏移; 而且这种影响可能伴随遗传因素, 具有不可逆性。 |
| 关键词: 刺网选择性, 表型性状, 标准差, 开发率 |
| DOI：10.11693/hyhz201202021021 |
| 分类号: |
| 基金项目:国家科技支撑计划项目, 2006BAD09A05 号; 农业部项目“渔具渔法专项调查与渔具选择性专题研究”资助, 2007.01—2008.12 |
附件 |
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| A STUDY ON THE IMPACT OF GILLNET ON THE PHENOTYPIC TRAITS OF FISH POPULATION |
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LIANG Zhen-Lin1,2, YAN Wei1, SUN Peng1, HUANG Liu-Yi1, TANG Yan-Li1
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1.Fisheries College, Ocean University of China;2.Marine College, Shandong University at Weihai
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| Abstract: |
| Based on models used in fishery biology, quantitative genetics, as well as numerical simulation methods , we developed a numerical simulation model to investigate whether long-term use of gillnet may affect the phenotypic traits (such as body length) of a fish population. In our simulation, we modeled a fish population that had a certain body length; then by varying a host of variables (σ, l0, R0), we explored the effect of long-term gillnet fishing as well as examined the stability of such effect after the fishing pressure was removed. The simulation results suggested that long-term fishing pressure was able to affect the characteristics of th e fish population, i.e., the lager the exploitation rate (E), the more distinct the effect. Furthermore, this impact was probably irreversible for a population that had experienced long-term fishing pressure. |
| Key words: Selectivity of gillnet, Phenotypic traits, Standard deviation, Exploitation rate |
