Feeding of humpback whales in low latitudes of the Southeast Pacific Ocean

IF 0.9 Q4 ECOLOGY Neotropical Biodiversity Pub Date : 2021-01-01 DOI:10.1080/23766808.2021.1971041
Ana García Cegarra, Cristina Castro, K. Van Waerebeek
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引用次数: 2

Abstract

ABSTRACT Humpback whales perform long migrations from their breeding and nursing areas at low latitudes to feeding grounds at high latitudes. Nonetheless, this strictly dichotomous paradigm of migration is challenged by accumulating examples of occasional or regular feeding at low latitudes for several stocks worldwide. Here, we report multiple evidences of “Stock G” humpback whales feeding in coastal waters, at low latitudes of the Southeast Pacific Ocean. Lunge feeding behavior and defecation were observed in Ecuador, while both lunge- and trap feeding in pursuit of Peruvian anchovy was documented in northern Chile. A photographically re-sighted individual feeding at different latitudes of Chile suggested potential site fidelity to two foraging areas. Whether these feeding behaviours are novel due to changes in prey distribution, intensifying competition from a growing humpback whale population, or simply reflect vastly increased research effort remains unknown. Further research into the feeding ecology of Stock G should help reveal historic and potentially new feeding grounds, prey composition and precise migration paths. Competition from anchovy fisheries, vessel collision and net entanglement are suspected threats.
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东南太平洋低纬度地区座头鲸的进食
摘要座头鲸从低纬度的繁殖和哺乳区到高纬度的觅食地进行长时间迁徙。尽管如此,这种严格的二分法移民模式受到了挑战,因为世界各地不断积累的几种种群在低纬度偶尔或定期觅食的例子。在这里,我们报告了“G种群”座头鲸在东南太平洋低纬度沿海水域觅食的多种证据。在厄瓜多尔观察到了箭步进食行为和排便,而在智利北部记录到了追逐秘鲁凤尾鱼的箭步和陷阱进食。一张在智利不同纬度觅食的照片表明,该地点可能与两个觅食区相似。这些进食行为是由于猎物分布的变化、来自不断增长的座头鲸种群的竞争加剧而产生的,还是仅仅反映了研究工作的大幅增加,目前尚不清楚。对G种群觅食生态的进一步研究应有助于揭示历史和潜在的新觅食地、猎物组成和精确的迁徙路径。来自凤尾鱼渔业的竞争、船只碰撞和渔网缠绕都是可疑的威胁。
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来源期刊
Neotropical Biodiversity
Neotropical Biodiversity Environmental Science-Ecology
CiteScore
1.80
自引率
0.00%
发文量
39
审稿时长
24 weeks
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