Spatial Ecology of Humpback Whales (Megaptera novaeangliae, Cetacea-Balaenopteridae) from the Mexican Central Pacific1

IF 0.7 4区生物学 Q4 MARINE & FRESHWATER BIOLOGY

Pacific Science Pub Date : 2022-09-22 DOI:10.2984/76.2.1

Christian D. Ortega‐Ortiz, Andrea B. Cuevas-Soltero, R. X. García-Valencia, Astrid Frisch‐Jordán, Katherina Audley, A. Olivos-Ortiz, M. Liñán-Cabello

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引用次数: 4

Abstract

Abstract: The Northeast Pacific subpopulation of the humpback whale migrates every winter-spring to Mexican waters to breed; however, their use of habitat in the Mexican Pacific remains unknown. We investigated the spatial ecology of the humpback whale in the Mexican Central Pacific (MCP) and connections with other Mexican areas. Surveys to search for humpback whales were conducted in winter-spring 2010–2019. The number of individuals, type of group, and activities were recorded, and flukes were photographed to differentiate individuals observed at Mexican areas. A total of 15,384.4 km were travelled in MCP waters and 462 groups of humpback whales were sighted. The dominant group were single and pairs, observed mainly off Colima coast. The principal activity was traveling, and the least frequent activity was likely-feeding. A total of 420 individuals were photo-identified, and through their sighting history, it was possible to calculate that only 2.14% (1.67–12.5%) of them showed site fidelity; this indicates that the MCP is a transit zone to other reproductive areas. A photographic catalog of 798 individuals from Socorro Island was also analyzed to compare with the MCP catalog, but there were no photo-recaptures between two areas. The comparison with catalogs of 302 individuals from the Guerrero coast and 1,459 individuals from Banderas Bay resulted in interchange indices of 1.02E–06 and 2.93E–07, respectively. The MCP is part of the breeding ground of humpback whales, but it seems to be a transit area that does not offer optimum conditions for permanence and sustained habitat use, possibly due to regional anthropogenic activities.

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墨西哥中太平洋座头鲸的空间生态学1

摘要:东北太平洋座头鲸亚群每年冬春洄游到墨西哥水域繁殖;然而，它们在墨西哥太平洋的栖息地的用途仍然未知。我们调查了墨西哥中太平洋(MCP)座头鲸的空间生态及其与墨西哥其他地区的联系。搜寻座头鲸的调查于2010-2019年冬春进行。记录了个体数量、群体类型和活动，并拍摄了吸虫照片，以区分在墨西哥地区观察到的个体。在MCP水域共行驶15,384.4公里，发现462群座头鲸。主要分布在科利马海岸，以单、对为主。最主要的活动是旅行，最不频繁的活动可能是进食。通过对420个个体的照片识别，可以计算出只有2.14%(1.67 ~ 12.5%)的个体具有站点保真度;这表明MCP是通往其他生殖区域的过渡区。对来自索科罗岛的798个个体的照片目录也进行了分析，以与MCP目录进行比较，但没有两个地区之间的照片重现。格雷罗海岸302个个体和班德拉斯湾1459个个体的交换指数分别为1.02E-06和2.93E-07。MCP是座头鲸繁殖地的一部分，但它似乎是一个中转区，可能由于区域人为活动，它不提供永久和持续使用栖息地的最佳条件。

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

Pacific Science 生物-动物学

CiteScore

1.40

自引率

14.30%

发文量

审稿时长

3 months

期刊介绍： Pacific Science: A Quarterly Devoted to the Biological and Physical Sciences of the Pacific Region The official journal of the Pacific Science Association. Appearing quarterly since 1947, Pacific Science is an international, multidisciplinary journal reporting research on the biological and physical sciences of the Pacific basin. It focuses on biogeography, ecology, evolution, geology and volcanology, oceanography, paleontology, and systematics. In addition to publishing original research, the journal features review articles providing a synthesis of current knowledge.