息地复杂性和捕食者气味对珊瑚礁鱼的压力反应和反捕食行为产生影响
Eric P Fakan1,2, Bridie J M Allan3, Björn Illing1,4
1ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD, Australia.
PloS one
|June 28, 2023
概括
珊瑚礁退化减少了息地复杂性,改变了猎物.
科学领域:
- 海洋生物学 海洋生物学
- 生态生态学 生态生态学
- 行为生态学 行为生态学
背景情况:
- 大规模的珊瑚漂白和局部压力因素导致广泛的珊瑚损失,减少了珊瑚礁的结构复杂性.
- 减少息地复杂性会影响掠食风险和猎物对威胁的感知.
- 了解息地复杂性和风险评估如何相互作用对于退化生态系统至关重要.
研究的目的:
- 调查不同息地复杂性如何影响猎物对掠食风险的反应.
- 检查息地复杂性,捕食者线索和猎物逃生反应之间的相互作用.
- 探索这些行为变化背后的荷尔蒙机制 (皮质醇).
主要方法:
- 幼 *Pomacentrus chrysurus* 在不同息地复杂度的环境中养.
- 在模拟掠食者袭击之前,猎物暴露在嗅觉捕食者风险线索中.
- 分析了全身皮质醇水平,以评估荷尔蒙反应.
主要成果:
- 通过捕食者线索和日益复杂的息地增强了快速启动逃生反应.
- 在逃跑反应中,复杂性和嗅觉线索之间没有发现相互作用.
- 皮质醇水平与息地复杂性和风险线索相互作用,当捕食者线索存在时,皮质醇在低复杂性中升高.
结论:
- 减少息地复杂性可能会导致猎物更好地评估掠食风险,因为视觉信息增加.
- 猎物可以根据环境背景调整它们的反应,从而潜在地减轻在退化息地的风险.
- 这种适应能力表明,在结构更简单的珊瑚礁中,猎物可能部分抵消了捕食者-猎物相互作用的增加.
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