Occurrence of long-finned pilot whales (Globicephala melas) and killer whales (Orcinus orca) in Icelandic coastal waters and their interspecific interactions

IF 1.1 4区 生物学 Q4 BEHAVIORAL SCIENCES acta ethologica Pub Date : 2022-06-07 DOI:10.1007/s10211-022-00394-1
Anna Selbmann, Charla J. Basran, Chiara G. Bertulli, Tess Hudson, Marie-Thérèse Mrusczok, Marianne H. Rasmussen, Jonathan N. Rempel, Judith Scott, Jörundur Svavarsson, Paul J. Wensveen, Megan Whittaker, Filipa I. P. Samarra
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引用次数: 5

Abstract

Long-finned pilot whales and killer whales are widely distributed across the North Atlantic, but few studies have reported their occurrence in Icelandic coastal waters. Here, we use sightings data from research platforms and whale watching tours in six regions of Iceland from 2007 to 2020 to show that the occurrence of long-finned pilot and killer whales varied with region and season. Killer whales were regularly encountered in the south of Iceland during summer and west of Iceland during winter/spring. Long-finned pilot whales were only seen during the summer and were most often encountered in the south, west, and northwest of Iceland. Long-finned pilot whale occurrence in the south of Iceland appeared to increase during the study period but killer whale occurrence showed no noticeable changes. Long-finned pilot whales were sighted often in the areas that were also frequented by killer whales and interspecific interactions were commonly observed when both species co-occurred. Interactions appeared to be antagonistic, with killer whales often avoiding long-finned pilot whales and sometimes fleeing at high speed, similar to what has been described elsewhere in the North Atlantic. In the majority of interactions observed (68%), killer whales avoided long-finned pilot whales by moving away, but in 28% avoidance was at high speed with both species porpoising. This variability in the type of behavioural responses indicates that interactions may be more complex than previously described. We discuss regional trends in long-finned pilot whale and killer whale sightings and potential drivers of the observed interactions.

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冰岛沿海水域长鳍领航鲸(Globicephala melas)和虎鲸(Orcinus orca)的发生及其种间相互作用
长鳍领航鲸和虎鲸广泛分布在北大西洋,但很少有研究报告它们在冰岛沿海水域出现。在这里,我们利用2007年至2020年在冰岛六个地区的研究平台和观鲸游的观测数据,表明长鳍领航鲸和虎鲸的出现随地区和季节而变化。夏季在冰岛南部和冬季/春季在冰岛西部经常会遇到虎鲸。长鳍领航鲸只在夏季出现,最常出现在冰岛的南部、西部和西北部。在研究期间,冰岛南部长鳍领航鲸的数量似乎有所增加,但虎鲸的数量没有明显变化。长鳍领航鲸经常出现在虎鲸经常出没的地区,当两个物种共同出现时,通常会观察到种间的相互作用。相互作用似乎是敌对的,虎鲸经常避开长鳍领航鲸,有时会高速逃跑,类似于北大西洋其他地方的描述。在观察到的大多数相互作用中(68%),虎鲸通过移动来避开长鳍领航鲸,但在28%的情况下,两种鼠海豚都以高速躲避。这种行为反应类型的可变性表明,相互作用可能比先前描述的更为复杂。我们讨论了长鳍领航鲸和虎鲸目击的区域趋势以及观察到的相互作用的潜在驱动因素。
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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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