隐藏的对手:鲯鳅对海鸟觅食行为的负面影响。

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-08-01 Epub Date: 2024-08-07 DOI:10.1098/rsbl.2024.0223
Shiho Koyama, Yusuke Goto, Seishiro Furukawa, Takuya Maekawa, Ken Yoda
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引用次数: 0

摘要

海洋捕食者经常在海空边界层聚集,追捕共同的猎物。在这种情况下,海鸟可能会从水下捕食者将鱼群赶到紧密的集群中获益,从而提高海鸟发现猎物的能力和捕获猎物的潜力。然而,这种共存可能会导致竞争,不仅影响直接的觅食策略,还会影响它们的分布和种间动态。我们研究了捕食日本鳀鱼(Engraulis japonicus)的条纹剪鸥(Calonectris leucomelas)和普通鲯鳅(Coryphaena hippurus)之间的纵向关系和瞬时相互作用。利用 2011 年至 2021 年的 GPS 数据,我们计算了条纹剪嘴鸥的行为参数,作为花费时间和飞行距离的指数。尽管日本鳀鱼数量众多,但我们发现条纹剪嘴鸥可能会在有水下捕食者的情况下增加觅食时间。此外,视频记录器提供了条纹剪鸥和普通鲯鳅攻击同一鱼群的直接证据,这可能会干扰鲯鳅觅食。我们的研究结果表明,在特定区域出现水下捕食者可能会增加海鸟的觅食时间,但不会影响海鸟的飞行距离。这突出表明,今后的研究需要考虑其他顶级捕食者对海鸟猎物供应的潜在不利影响。
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Hidden rivals: the negative impacts of dolphinfish on seabird foraging behaviour.

Marine predators often aggregate at the air-sea boundary layer to pursue shared prey. In such scenarios, seabirds are likely to benefit from underwater predators herding fish schools into tight clusters thereby enhancing seabirds' prey detectability and capture potential. However, this coexistence can lead to competition, affecting not only immediate foraging strategies but also their distribution and interspecies dynamics. We investigated both the longitudinal relationships and instantaneous interactions between streaked shearwaters (Calonectris leucomelas) and common dolphinfish (Coryphaena hippurus), both preying on Japanese anchovy (Engraulis japonicus). Using GPS data from 2011 to 2021, we calculated behavioural parameters for streaked shearwaters as an index of time spent and distance travelled. Despite the abundance of Japanese anchovies, we found that streaked shearwaters might increase their foraging time in the presence of underwater predators. Moreover, video loggers provided direct evidence of streaked shearwaters and common dolphinfish attacking the same fish schools, potentially interfering with bird foraging by dolphinfish. Our results suggest that the presence of underwater predators in a given patch might increase the time spent by seabirds foraging without affecting the distance travelled. This highlights the need for future studies that consider the potential adverse effects of other top predators on seabird prey availability.

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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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