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低温暴露对三种潮间捕食者的致命和次致命影响
Danja Currie-Olsen1, Amelia V Hesketh1, Jaime Grimm1
1Department of Zoology, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.
Journal of thermal biology
|May 27, 2023
概括
冬季的低潮对潮间的捕食者构成重大威胁. 暴露于寒冷会影响海星和狗,降低生存率和食率,对捕食者-猎物动态产生影响.
科学领域:
- 海洋生态海洋生态学
- 潮间区生物学 潮间区生物学
- 无脊椎动物生理学 无脊椎动物生理学
背景情况:
- 潮间掠食者调节生态系统,但冬季寒冷的压力影响还没有得到充分研究.
- 这些捕食者的夏季热量压力得到了充分研究,与冬季寒冷不同.
- 了解冬季的影响对于潮间生态系统的健康至关重要.
研究的目的:
- 研究冬季寒冷暴露对关键的潮间掠食者的影响.
- 评估海星和狗的超冷点,生存率和食率.
- 为了检查微息地使用和体温在冬季低潮期间的变化.
主要方法:
- 在暴露于寒冷后测量了Pisaster ochraceus,Evasterias troschelii和Nucella lamellosa的超冷点和生存率.
- 在次致命的寒冷压力后评估养率.
- 在冬季低潮期间,在不同的微生境中量化掠食者体温.
主要成果:
- 捕食者在温和的零下温度下表现出内部结 (海星: -2.5°C,狗: -3.99°C).
- 暴露于-8°C后的生存率中等至低.
- 在暴露至 -0.5°C后的两周内,食率显著下降.
结论:
- 潮间的捕食者对冷的耐受性有限,因此它们很容易受到冬季条件的影响.
- 减少食和生存可能会改变潮区的捕食者-猎物动态.
- 息地微气候影响掠食者的体温,但没有观察到行为温度调节.
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