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首页> 外文期刊>Estuarine Coastal and Shelf Science >Influence of El Nino-Southern Oscillation on the population structure of a sea lion breeding colony in the Gulf of California
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Influence of El Nino-Southern Oscillation on the population structure of a sea lion breeding colony in the Gulf of California

机译：厄尔尼诺现象-南方涛动对加利福尼亚湾海狮繁殖地种群结构的影响

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摘要

The El Nino-Southern Oscillation (ENSO) phenomenon has a significant influence on Pacific marine ecosystems from primary trophic levels to top predators that cause fluctuations in their populations. Based on this fact we analyzed the sea lion Zalophus califomianus population structure variability using censuses performed from 1979 to 2004 in Los Islotes breeding colony located at La Paz Bay as well as concomitant the ENSO phenomenon variability. To discriminate variations in the population structure not ascribable to the population attributes, a virtual population was created and compared to the census population. The residuals obtained from this comparison were correlated with the MEI (Multivariate ENSO Index) and BEST (Bivariate ENSO Time Series) indices, descriptors of the ENSO variability. The results showed that the population structure is an adequate descriptor of the conditions of the population instead of the abundance, and the total population is affected by the ENSO. The adult, subadult and pup male groups were the most sensitive groups to this phenomenon due to their intrinsic development and behavior. Likewise the BEST index is a better descriptor than the MEI index of the ENSO influence in the region where the breeding colony Los Islotes resides. Therefore we demonstrate in this work that changes caused by the ENSO not directly affect the sea lion due to its homeothermic capacity but affects the habitat where this organism performs its biological functions, producing behavioral changes in the population. (C) 2015 Elsevier Ltd. All rights reserved.
机译：El Nino-Southern Oscillation（ENSO）现象对太平洋海洋生态系统产生了重大影响，从主要营养级别到造成种群波动的主要掠食者。基于这一事实，我们使用1979年至2004年在位于拉巴斯湾的Los Islotes繁殖群体中进行的普查，分析了海狮Zalophus califomianus种群结构的变异性，并分析了ENSO现象的变异性。为了区分人口结构中不归因于人口属性的变化，创建了虚拟人口并将其与普查人口进行比较。从此比较中获得的残差与MEI（多元ENSO指数）和BEST（二元ENSO时间序列）指数相关，它们是ENSO变异性的描述。结果表明，人口结构是人口状况的充分描述，而不是人口的丰度，总人口受ENSO影响。由于其内在的发育和行为，成年，亚成年和幼小男性群体是对该现象最敏感的群体。同样，在繁殖群体洛斯伊索洛特斯居住的地区，BEST指数比ENSO影响的MEI指数更好。因此，我们在这项工作中证明，由ENSO引起的变化不会因海狮的恒温能力而直接影响海狮，而是会影响该生物体履行其生物学功能的栖息地，从而在种群中产生行为变化。 （C）2015 Elsevier Ltd.保留所有权利。

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