Subsurface Behaviors of Hector's Dolphins Could Increase Their Risk of Bycatch

IF 7.7 1区环境科学与生态学 Q1 BIODIVERSITY CONSERVATION

Conservation Letters Pub Date : 2025-09-14 DOI:10.1111/conl.13144

Ilias Foskolos, Mark Johnson, Deanna Clement, Olga Belonovich, Simon Childerhouse, Anton van Helden, Darryl MacKenzie, Mike Ogle, Heloise Pavanato, Roger Williams, Rochelle Constantine

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引用次数: 0

Abstract

Hector's dolphins, endemic to New Zealand, suffer from bycatch in fishing gear. Fishing restrictions in inshore areas have reduced bycatch, although dolphins have been recorded outside these areas. We studied the subsurface movements and foraging behavior of 11 Hector's dolphins using high-resolution biologging tags to gain insight into their bycatch risk. Tagged dolphins traveled up to 15 km offshore, well beyond the boundaries of fishery exclusion zones, and regularly dove to the seafloor to forage at depths of up to 122 m. During these dives, the dolphins exhibited specific body postures that could increase their risk of bycatch. In addition, some dolphins produced very few echolocation clicks while traveling throughout the water column, potentially limiting their ability to detect nets. These subsurface behaviors may make Hector's dolphins more vulnerable to bycatch than previously thought, highlighting the need to reassess the efficacy of current protection measures.

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海克特海豚的水下行为可能会增加它们被误捕的风险

新西兰特有的赫克托耳海豚正遭受着渔具附带捕获的痛苦。近海地区的捕鱼限制减少了副渔获量，尽管在这些地区之外也有海豚的记录。我们使用高分辨率的生物标签研究了11只赫克托耳海豚的地下运动和觅食行为，以了解它们的副捕获风险。带标签的海豚可以游到离岸15公里的地方，远远超出了渔业禁区的界限，并定期潜入海底，在122米深的地方觅食。在这些潜水过程中，海豚表现出特定的身体姿势，这可能会增加它们被副捕获的风险。此外，一些海豚在水柱中游动时很少发出回声定位声，这可能限制了它们探测渔网的能力。这些水下行为可能使赫克托海豚比以前认为的更容易受到副渔获物的伤害，这凸显了重新评估当前保护措施有效性的必要性。

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来源期刊

Conservation Letters BIODIVERSITY CONSERVATION-

CiteScore

13.50

自引率

2.40%

发文量

审稿时长

>12 weeks

期刊介绍： Conservation Letters is a reputable scientific journal that is devoted to the publication of both empirical and theoretical research that has important implications for the conservation of biological diversity. The journal warmly invites submissions from various disciplines within the biological and social sciences, with a particular interest in interdisciplinary work. The primary aim is to advance both pragmatic conservation objectives and scientific knowledge. Manuscripts are subject to a rapid communication schedule, therefore they should address current and relevant topics. Research articles should effectively communicate the significance of their findings in relation to conservation policy and practice.