Biology Department, Loyola Marymount University, Los Angeles, CA, 90045, USA; Coastal Research Institute, Loyola Marymount University, Los Angeles, CA, 90045, USA.
Biology Department, Loyola Marymount University, Los Angeles, CA, 90045, USA.
Mar Environ Res. 2022 Jun;178:105665. doi: 10.1016/j.marenvres.2022.105665. Epub 2022 May 25.
The invasive mussel Mytilus galloprovincialis is a heat-tolerant species relative to its competative congener M. trossulus, that dominates warm seawater environments but it is unknown how multiple stressors (MS) may affect its physiology. Our study determined the effects of MS on the metabolic rate (MR), superoxide dismutase (SOD) antioxidant enzyme activity, and clearance rate (CR) of M. galloprovincialis. Mussels were exposed for 7 d to hyposalinity (20, 28, 34 ppt) then to heat shock (17, 20, 25 °C) after which MR and SOD activity were determined. CR was quantified following a 30 min MS exposure. We found a significant influence of MS on MR, SOD, and CR. We identified synergistic effects on MR under the most extreme treatment. SOD activity was the greatest under 20 °C exposure while CR declined under heat shock. Thus, our study suggests that mussels experiencing MS may become energy limited as MR increases and feeding rates decrease.
入侵贻贝厚壳贻贝相对于其竞争种贻贝 M. trossulus 而言是一种耐热物种，它在温暖的海水环境中占主导地位，但尚不清楚多种胁迫（MS）如何影响其生理机能。本研究旨在确定 MS 对厚壳贻贝代谢率（MR）、超氧化物歧化酶（SOD）抗氧化酶活性和清除率（CR）的影响。贻贝在低渗（20、28、34 ppt）条件下暴露 7 天后，再进行热休克（17、20、25°C），然后测定 MR 和 SOD 活性。在经历 30 分钟 MS 暴露后，量化 CR。我们发现 MS 对 MR、SOD 和 CR 有显著影响。在最极端的处理下，我们发现了对 MR 的协同作用。SOD 活性在 20°C 暴露下最大，而在热冲击下 CR 下降。因此，我们的研究表明，经历 MS 的贻贝可能会因 MR 增加和摄食率下降而变得能量有限。
