Spatial segregation and interspecific killing of common dolphins (Delphinus delphis) by bottlenose dolphins (Tursiops truncatus)

IF 1.1 4区 生物学 Q4 BEHAVIORAL SCIENCES acta ethologica Pub Date : 2021-03-12 DOI:10.1007/s10211-021-00363-0
Séverine Methion, Bruno Díaz López
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引用次数: 6

Abstract

We described the spatial segregation of two species of cetaceans, the common dolphin and the bottlenose dolphin. We also document the first direct observation of interspecific killing of a common dolphin by bottlenose dolphins and of interspecific necrophilia in cetaceans. The study was conducted from 2014 to 2019 in the Ría de Arousa (Northwest Spain). This study highlights that both species use this area as a foraging ground, although they show different patterns of occurrence (bottlenose dolphins were always observed in the ria and common dolphins were mostly observed outside). During the study period, bottlenose dolphins and common dolphins were only observed on five occasions at the same time and in the same area, including three occasions which led to the displacement of the common dolphin(s), and one lethal interaction. In this event, several bottlenose dolphins, including adults and calves, and males and females, aggressively herded, chased, and assaulted a common dolphin. After approximatively 10 min, the common dolphin corpse appeared floating at the surface, and several adult male bottlenose dolphins repeatedly pushed the body underneath the water surface and an (attempted) copulation was witnessed. We suggest that the common dolphin could have been killed for competition for food resources or practice for infanticide, and sexual arousal might have been triggered by expression of dominance. Further information about the occurrence of such behaviors, and the outcomes through specific studies on fitness would be crucial to further understand the implication of such events.

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宽吻海豚(Tursiops truncatus)对普通海豚(Delphinus delphis)的空间隔离和种间杀戮
我们描述了两种鲸目动物,普通海豚和宽吻海豚的空间隔离。我们还记录了第一次直接观察到宽吻海豚的种间杀戮和鲸目动物的种间恋尸癖。该研究于2014年至2019年在Ría de阿拉瓦(西班牙西北部)进行。这项研究强调,这两个物种都将这一地区作为觅食地,尽管它们表现出不同的出现模式(宽吻海豚总是在ria中观察到,而普通海豚大多在室外观察到)。在研究期间,宽吻海豚和普通海豚在同一时间和同一区域只观察到五次,其中包括三次导致普通海豚流离失所的情况,以及一次致命的相互作用。在这次事件中,几只宽吻海豚,包括成年海豚和幼海豚,雄性和雌性,积极地聚集在一起,追逐并袭击了一只普通的海豚。大约10分钟后,普通海豚的尸体漂浮在水面上,几只成年雄性宽吻海豚反复将尸体推到水面下,并目睹了(试图)交配。我们认为,普通的海豚可能是为了争夺食物资源或杀婴而被杀死的,而性唤起可能是由统治地位的表达引发的。进一步了解此类行为的发生,以及通过特定的适应度研究得出的结果,对于进一步理解此类事件的含义至关重要。
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来源期刊
acta ethologica
acta ethologica 生物-动物学
CiteScore
1.90
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: acta ethologica publishes empirical and theoretical research papers, short communications, commentaries, reviews and book reviews as well as methods papers in the field of ethology and related disciplines, with a strong concentration on the behavior biology of humans and other animals. The journal places special emphasis on studies integrating proximate (mechanisms, development) and ultimate (function, evolution) levels in the analysis of behavior. Aspects of particular interest include: adaptive plasticity of behavior, inter-individual and geographic variations in behavior, mechanisms underlying behavior, evolutionary processes and functions of behavior, and many other topics. acta ethologica is an official journal of ISPA, CRL and the Portuguese Ethological Society (SPE)
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