POPULATION-DYNAMICS OF EXPLOITED FISH STOCKS AT LOW POPULATION-LEVELS
POPULATION-DYNAMICS OF EXPLOITED FISH STOCKS AT LOW POPULATION-LEVELS
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DOI：
10.1126/science.269.5227.1106
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发表时间：
1995-08-25
期刊：
影响因子：
56.9
通讯作者：
ROSENBERG, AA
中科院分区：
文献类型：
--
作者：
MYERS, RA;BARROWMAN, NJ;ROSENBERG, AA
在低人口水平下，人均生殖成功率下降的人口动力学模型（各种称为依赖，Allee效应和逆密度依赖）预测人口可以有多个平衡，并可能突然从一个平衡转移到另一个平衡。如果存在这种依赖性动力学，减少死亡率可能不足以使恢复后，丰富的人口已严重减少收获。对128个鱼类种群的产卵丰度和存活后代数量的估计表明，只有3个种群具有显著的减少。估计的统计能力的测试加强的结论，depensatory动态是不明显的鱼类种群在研究的水平。
Models of population dynamics in which per capita reproductive success declines at low population levels (variously known as depensation, the Allee effect, and inverse density-dependence) predict that populations can have multiple equilibria and may suddenly shift from one equilibrium to another. If such depensatory dynamics exist, reduced mortality may be insufficient to allow recovery of a population after abundance has been severely reduced by harvesting. Estimates of spawner abundance and number of surviving progeny for 128 fish stocks indicated only 3 stocks with significant depensation. Estimates of the statistical power of the tests strengthen the conclusion that depensatory dynamics are not apparent for fish populations at the levels studied.