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Ocean warming impairs the predator avoidance behaviour of elasmobranch embryos
Conservation Physiology ( IF 2.7 ) Pub Date : 2021-05-25 , DOI: 10.1093/conphys/coab045
Daniel M Ripley 1 , Sara De Giorgio 1 , Kirstin Gaffney 1 , Lowri Thomas 1 , Holly A Shiels 1
Affiliation  

Embryogenesis is a vulnerable stage in elasmobranch development due in part to high predation mortality. Embryonic elasmobranchs respond to potential predators by displaying a freezing behaviour, characterized by the cessation of pharyngeal respiration followed immediately by coiling of the tail around the body. We hypothesized that the duration of this freeze response is limited by the embryo’s requirement for oxygen. Here, Scyliorhinus canicula embryos were incubated at either 15°C or 20°C during embryogenesis and tested for the duration of, and metabolic consequence of, the freeze response at their respective incubation temperature. Freeze response duration was negatively impacted by routine metabolic rate; embryos at 20°C had 7-fold shorter freeze duration than those at 15°C, potentially increasing their susceptibility to predation. These data demonstrate the capacity for climate change stressors to affect animal behaviour and suggest that this may occur by eliciting changes in the organism’s metabolism. We suggest altered predator avoidance behaviour is a new factor to consider when assessing the impact of climate change on the conservation and management of oviparous elasmobranch species.

中文翻译:

海洋变暖损害了软骨鱼胚胎的捕食者回避行为

胚胎发生是弹性鳃发育的一个脆弱阶段,部分原因是高捕食死亡率。胚胎弹性鳃通过表现出冻结行为来对潜在的捕食者做出反应,其特征是咽呼吸停止,随后立即将尾巴缠绕在身体周围。我们假设这种冷冻反应的持续时间受到胚胎对氧气的需求的限制。在这里,Scyliorhinus canicula 胚胎在胚胎发生过程中在 15°C 或 20°C 下孵育,并在其各自的孵育温度下测试冷冻反应的持续时间和代谢后果。冷冻反应持续时间受到常规代谢率的负面影响;20°C 的胚胎的冷冻时间比 15°C 的胚胎短 7 倍,这可能会增加它们对捕食的敏感性。这些数据证明了气候变化压力源影响动物行为的能力,并表明这可能通过引发生物体新陈代谢的变化而发生。我们建议,在评估气候变化对卵生软骨鱼类保护和管理的影响时,改变的捕食者回避行为是一个需要考虑的新因素。
更新日期:2021-05-25
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