Spatiotemporal variation in harbor porpoise distribution and foraging across a landscape of fear

Spatiotemporal variation in harbor porpoise distribution and foraging across a landscape of fear
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港湾鼠海豚分布和在恐惧景观中觅食的时空变化

DOI:
10.1111/mms.12839
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发表时间:
2021
影响因子:
2.3
通讯作者:
Williamson L
Williamson L
中科院分区:
生物学3区
文献类型:
--
作者:
Williamson L

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了解时空变化的动物分布可以为物种行为的生态学理解提供信息(例如,觅食和捕食者/猎物的相互作用),并支持管理和保护措施的发展。利用贝叶斯时空模型分析了回声定位-点击探测器(C-POD)阵列的数据,以研究港湾鼠海豚(Phocoena phocoena)发生和觅食活动的时空变化,以及这种变化如何受到日光和短吻海豚(Tursiops truncatus)的影响。江豚出现的概率是最高的离岸沙洲,在那里的比例与觅食点击检测相对较低。江豚的整体分布在整个夏季和秋季发生变化,可能受到季节性猎物供应的影响。在靠近海岸的地区,海豚出现的概率最低,海豚检测最高,并在海豚检测之前下降,从而可能避免海豚和海豚之间的时空重叠。对江豚的季节性分布、主要觅食区域以及它们与竞争对手的关系的进一步了解,可以为管理选择和与离岸产业的潜在互动提供帮助。
Understanding spatiotemporally varying animal distributions can inform ecological understanding of species' behavior (e.g., foraging and predator/prey interactions) and support development of management and conservation measures. Data from an array of echolocation‐click detectors (C‐PODs) were analyzed using Bayesian spatiotemporal modeling to investigate spatial and temporal variation in occurrence and foraging activity of harbor porpoises (Phocoena phocoena) and how this variation was influenced by daylight and presence of bottlenose dolphins (Tursiops truncatus). The probability of occurrence of porpoises was highest on an offshore sandbank, where the proportion of detections with foraging clicks was relatively low. The porpoises' overall distribution shifted throughout the summer and autumn, likely influenced by seasonal prey availability. Probability of porpoise occurrence was lowest in areas close to the coast, where dolphin detections were highest and declined prior to dolphin detection, leading potentially to avoidance of spatiotemporal overlap between porpoises and dolphins. Increased understanding of porpoises' seasonal distribution, key foraging areas, and their relationship with competitors can shed light on management options and potential interactions with offshore industries.
将灰色海豹暴露为港口海豚的主要捕食者。
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