Influence of environmental variability on the distribution and abundance of the pantropical spotted dolphin (Stenella attenuata) in the Mexican Central Pacific

IF 0.5 4区生物学 Q4 MARINE & FRESHWATER BIOLOGY

Ciencias Marinas Pub Date : 2022-03-31 DOI:10.7773/cm.y2022.3215

Evelyn R Díaz-Torres, Emigdio Marín-Enríquez, A. Corgos, A. Olivos-Ortiz, Christian D. Ortega‐Ortiz

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引用次数: 1

Abstract

The Mexican Central Pacific (MCP) has complex oceanographic dynamics, with a well-defined seasonal pattern and influence of interannual sea surface temperature anomalies. The present study investigated the relationship between the distribution/abundance of spotted dolphins and the environmental conditions in the MCP. Dolphin sighting data were collected during January 2010–December 2015; distance to coast, sea surface temperature, and chlorophyll a (Chla) were obtained for each sighting location through georeferenced maps and satellite images. A total of 746 spotted dolphin sightings were obtained with a survey effort of 31,695 km. Spotted dolphins in the MCP showed a predominantly coastal distribution regardless of environmental conditions. Significant differences were detected concerning regional seasonal variation, with higher mean sighting rate during the stratified periods and higher density/abundance estimates during the mixed periods. Spotted dolphins showed preference for warmer conditions, with higher mean sighting rate, abundance, and distance to coast during the neutral and warm interannual periods. During the coolest conditions (cold periods), mean sighting rate and abundance decreased and spotted dolphins were located closer to the coast, where Chla concentration increased. These results suggest that changes in the distribution/abundance of these dolphins could be associated with habitat quality related to tropical (El Niño/Southern Oscillation) and extratropical (The Blob) oceanographic phenomena, which could be modulating their foraging activities.

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环境变异对墨西哥中太平洋泛热带斑海豚分布和丰度的影响

墨西哥中太平洋（MCP）具有复杂的海洋动力学，具有明确的季节模式和年际海面温度异常的影响。本研究调查了斑海豚的分布/丰度与MCP环境条件之间的关系。海豚目击数据是在2010年1月至2015年12月期间收集的；通过地理参考地图和卫星图像获得了每个观测位置到海岸的距离、海面温度和叶绿素a。在31695公里的调查中，共发现746只斑点海豚。无论环境条件如何，MCP中的斑点海豚都主要分布在沿海。区域季节变化存在显著差异，分层期的平均观测率较高，混合期的密度/丰度估计值较高。斑点海豚表现出对温暖条件的偏好，在中性和温暖的年际期间，平均目击率、丰度和到海岸的距离都较高。在最冷的条件下（寒冷时期），平均目击率和丰度下降，斑点海豚位于离海岸更近的地方，那里的叶绿素a浓度增加。这些结果表明，这些海豚的分布/丰度变化可能与热带（厄尔尼诺/南方涛动）和温带（Blob）海洋现象相关的栖息地质量有关，这可能会调节它们的觅食活动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ciencias Marinas 生物-海洋与淡水生物学

CiteScore

1.10

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： A bilingual open-access publication, Ciencias Marinas (CM) is an international peer-reviewed journal that contains original research findings in all areas of marine science. It is published quarterly by the Autonomous University of Baja California, Mexico, and all its contents are publicly available on our journal website. Though a limited number of copies are still printed, the journal is mainly distributed in its electronic format. CM was conceived in 1973 as part of an academic project aimed to entice local researchers to publicly disclose their findings by adopting the culture of peer-review publishing. This academic project evolved into an international journal after accepting papers from researchers in the United States and, eventually, other parts of the world. Because of the diversity in authorship, CM issues were initially published in either Spanish or English, and occasionally in both languages. It was not until 1984 when CM included both language versions of all its contents, and it then became the fully bilingual journal it still is today. At CM we believe our inclusive format allows us not only to address a wider range of submissions from international authors but also to make published findings available to a wider international audience. So whether you are looking for information on the redfish in Icelandic waters or the physical and biological properties of the Gulf of California, feel free to peruse CM contents. You may find them to provide source material for your research.