Seasonal changes in distribution and habitat differences among dolphins in the eastern tropical Pacific
Seasonal changes in distribution and habitat differences among dolphins in the eastern tropical Pacific
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热带东太平洋海豚分布季节变化及栖息地差异
DOI：
10.3354/meps066001
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发表时间：
1990
影响因子：
2.5
通讯作者：
S. Reilly
中科院分区：
文献类型：
--
作者：
S. Reilly
1982年、1986年和1987年6月至11月在热带东太平洋中上层进行的调查船调查研究了海豚分布和海洋学的大规模格局。观察到与以前报道的斑点海豚和/或飞旋海豚群（Stenella attenuata和/或S. 1 ongirostris）和条纹海豚群（S. coeruleoalba）。这些海豚物种在沿着10“N的120“W以西大量出现，与温跃层脊的季节性变浅相一致。没有季节性分布的变化，观察到常见的海豚学校（Delphinus delphis），在冬季，他们占据了该地区的上升流修改的沃茨。最高密度区的3个学校类型在空间上有明显的分离，和温跃层深度和sigma-t的目击地点之间的spottedlspinner海豚学校和普通海豚学校的统计学差异。根据这些生境变量，条纹海豚群不能与其他2种类型区分开来，表明其他因素或过程有助于观察到的3种分布的空间分离。
Large-scale patterns of dolphin distribution and oceanography were studied from research-vessel surveys conducted in the pelagic eastern tropical Pacific dunng June to November 1982, 1986 and 1987. Substantial changes were observed in relation to previously reported winter distributions for spotted and/or spinner dolphin schools (Stenella attenuata and/or S. 1ongirostris)and for striped dolphin schools (S. coeruleoalba). These dolphin species were sighted in abundance west of 120"W along 10"N coincident with seasonal shoaling of a thermocline ridge. No seasonal distribution changes were observed for common dolphin schools (Delphinus delphis); as in the winter, they occupied upwelling-modified waters of the region. Highest-density areas for the 3 school types were clearly separated spatially, and the thermocline depths and sigma-t's of sighting localities were statistically different between spottedlspinner dolphin schools and common dolphin schools. Striped dolphin schools could not be discriminated from the other 2 types based on these habitat variables, indicating other factors or processes contribute to the observed spatial separation of the 3 distributions.