Departamento de Ecología y Biodiversidad, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile; Centro de Investigación Marina Quintay (CIMARQ), Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile.
Centro de Investigación e Innovación para el Cambio Climático (CiiCC), Facultad de Ciencias, Universidad Santo Tomás, Ejercito 146, Santiago, Chile.
Chemosphere. 2022 Feb;288(Pt 1):132410. doi: 10.1016/j.chemosphere.2021.132410. Epub 2021 Sep 29.
Widespread intertidal mussels are exposed to a variety of natural and anthropogenic stressors. Even so, our understanding of the combined influence of stressors such as predation risk and ocean acidification (OA) on these species remains limited. This study examined the response of the purple mussel (Perumytilus purpuratus), a species distributed along Pacific southeastern rocky shores, to the effects of predation risk and OA. Using a laboratory 2 × 2 cross design, purple mussels were either devoid or exposed to predator cues from the muricid snail Acanthina monodon, while simultaneously exposing them to current (500 ppm) or projected OA conditions (1500 ppm). The response of purple mussels to these factors was assessed using growth, calcification, clearance, and metabolic rates, in addition to byssus production. After 60 d, the presence of predator cues reduced mussel growth in width and length, and in the latter case, OA enhanced this response making the effects of predator cues more severe. Calcification rates were driven by the interaction between the two stressors, whereas clearance rates increased only in response to OA, likely explaining some of the growth results. Mussel byssus production also increased with pCO but interacted with predation risk: in the absence of predator cues, byssus production increased with OA. These results suggest that projected levels of OA may alter and in some cases prevail over the natural response of purple mussels to predation risk. Considering the role played by this mussel as a dominant competitor and ecosystem engineer in rocky shores, these results have community-wide implications.
广泛分布的潮间带贻贝暴露于多种自然和人为胁迫因素之下。即便如此，我们对于捕食风险和海洋酸化（OA）等胁迫因素综合影响这些物种的理解仍然有限。本研究检测了贻贝（Perumytilus purpuratus）对捕食风险和 OA 的响应，贻贝分布于太平洋东南沿海的岩石海岸。采用实验室 2×2 交叉设计，贻贝要么暴露于斑纹骨螺（Acanthina monodon）的捕食者线索下，要么没有暴露，同时将其暴露于当前（500ppm）或预测的 OA 条件（1500ppm）下。使用生长、钙化、清除和代谢率以及足丝生产来评估贻贝对这些因素的响应。60d 后，捕食者线索的存在降低了贻贝在宽度和长度上的生长，在后者的情况下，OA 增强了这种响应，使捕食者线索的影响更加严重。钙化率受到两个胁迫因素的相互作用的驱动，而清除率仅响应于 OA 而增加，这可能解释了一些生长结果。贻贝足丝生产也随着 pCO 增加，但与捕食风险相互作用：在没有捕食者线索的情况下，足丝生产随着 OA 而增加。这些结果表明，预测的 OA 水平可能会改变并在某些情况下超过贻贝对捕食风险的自然响应。考虑到这种贻贝在岩石海岸作为优势竞争者和生态系统工程师的作用，这些结果具有广泛的社区意义。
