Geographic variation in density, demography, and life history traits of a harvested, sex-changing, temperate reef fish
Geographic variation in density, demography, and life history traits of a harvested, sex-changing, temperate reef fish
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DOI：
10.1139/f10-140
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发表时间：
2011-02-01
影响因子：
2.4
通讯作者：
Sosa-Nishizaki, Oscar
中科院分区：
文献类型：
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作者：
Caselle, Jennifer E.;Hamilton, Scott L.;Sosa-Nishizaki, Oscar
生态和环境因素的地理差异可能导致种群之间的种内差异。对于加州羊头羊（Semicossyphus pulcher），海带森林中的重要捕食者以及商业和休闲渔业的目标，我们评估了不同种群在密度、人口统计和生活史特征方面表现出差异的程度。我们通过水下目视普查评估了 39 个地点的生物地理丰富度，涵盖了大部分物种范围（美国加利福尼亚州南部到墨西哥下加利福尼亚州），并从 7 个重点地点进行了采集，以调查人口统计和生活史的地理差异。加州羊头密度在其活动范围南部和近海岛屿上明显高于大陆海岸。在焦点地点，我们发现密度、繁殖力、大小结构、生长率、年存活率以及成熟和性别变化的时间存在显着的空间变化。密度和温度依赖性效应有助于解释这些参数的种内差异。诸如此类的研究将允许将人口可塑性纳入未来的库存评估中。随着我们对种群间地理差异的了解不断加深，温带珊瑚礁鱼类的管理最好在较小的空间尺度上实现。
Geographic variation in ecological and environmental factors may lead to intraspecific differences among populations. For the California sheephead (Semicossyphus pulcher), an important predator in kelp forests and a target of commercial and recreational fisheries, we evaluated the degree to which different populations exhibited variation in density, demography, and life history traits. We assessed biogeographic patterns of abundance through underwater visual census at 39 sites spanning a major portion of the species range ( southern California, USA, to Baja California, Mexico) and made collections from seven focal sites to investigate geographic differences in demography and life histories. California sheephead densities were significantly greater in the southern part of their range and at offshore islands than along the mainland coast. At the focal sites, we found significant spatial variation in density, fecundity, size structure, growth rates, annual survivorship, and the timing of maturation and sex change. Density- and temperature-dependent effects helped to explain the intraspecific differences in these parameters. Studies such as this one will allow for demographic plasticity to be incorporated into future stock assessments. Management of temperate reef fishes may best be achieved on smaller spatial scales as we increase our understanding of geographic variation among populations.