Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, 5090000, Valdivia, Chile.
Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, 5090000, Valdivia, Chile; Centro FONDAP de Investigación de Dinámicas de Ecosistemas Marinos de Altas Latitudes (IDEAL), 5090000, Valdivia, Chile.
Mar Environ Res. 2022 Mar;175:105573. doi: 10.1016/j.marenvres.2022.105573. Epub 2022 Feb 2.
Predators can influence prey through direct consumption as well as through non-consumptive effects (NCEs). NCEs usually occur mediated by behavioral changes in the prey upon detection of predator cues. Such changes may involve reduction of feeding with a variety of physiological consequences. We evaluated NCEs from an intertidal predatory snail (Acanthina monodon) on a dominant habitat-forming mussel species (Perumytilus purpuratus) from the southeastern Pacific coast. We tested whether A. monodon exerts negative NCEs on clearance rate, oxygen consumption rate, biodeposit production, and between-valve gap size in P. purpuratus. We found that waterborne predator cues triggered a decrease in these variables except biodeposit production. However, the organic content of the biodeposits increased in the presence of predator cues. The snail's physical contact with the mussels strengthened the negative NCEs on between-valve gap size. Since P. purpuratus is a dominant filter-feeder and foundation species in rocky intertidal habitats, predator NCEs on this species might indirectly influence ecosystem-level processes and community structure.
掠食者可以通过直接捕食以及非消耗性影响（NCE）来影响猎物。NCE 通常通过猎物在检测到捕食者线索时发生的行为变化来介导。这种变化可能涉及减少进食，并伴有各种生理后果。我们评估了来自东南太平洋海岸优势生境形成贻贝物种（Perumytilus purpuratus）的潮间带掠食性蜗牛（Acanthina monodon）的 NCE。我们测试了 A. monodon 是否对 P. purpuratus 的清除率、耗氧率、生物沉积物产量和两壳之间的间隙大小产生负 NCE。我们发现，水载捕食者线索触发了这些变量的减少，除了生物沉积物的产生。然而，在存在捕食者线索的情况下，生物沉积物的有机含量增加。蜗牛与贻贝的物理接触增强了两壳之间间隙的负 NCE。由于 P. purpuratus 是潮间带岩石栖息地中的优势滤食者和基础物种，因此对该物种的捕食者 NCE 可能会间接影响生态系统水平的过程和群落结构。
