Lassoued Jihene, Padín X A, Comeau Luc A, Bejaoui Nejla, Pérez Fiz F, Babarro Jose M F
Instituto de Investigaciones Marinas, IIM-CSIC, Eduardo Cabello 6, 36208 Vigo (Pontevedra), Spain.
Institut National Agronomique de Tunisie, INAT, Université de Carthage, 43 Avenue Charles Nicolle, 1082 Tunis, Tunisia.
Conserv Physiol. 2021 Feb 4;9(1):coaa114. doi: 10.1093/conphys/coaa114. eCollection 2021.
The impact of simulated seawater acidification and warming conditions on specimens of the mussel locally adapted to very distinct, widely separated sites in the Mediterranean Sea (Tunisia) and Atlantic Sea (Galicia, NW Spain) was evaluated in relation to key behavioural and eco-physiological parameters. Over the 2-month exposure to the experimental conditions, mussels were fed optimally to ensure that there are no synergistic interactions between climate change drivers and energetic status of the individuals. In general, regardless of origin (Atlantic or Mediterranean), the mussels were rather resilient to acidification for most of the parameters considered and they were able to grow in strongly acidified seawater through an increased feeding activity. However, shell strength decreased (40%) consistently in both mussel populations held in moderately and highly acidified seawater. The observed reduction in shell strength was not explained by slight alterations in organic matter, shell thickness or aragonite:calcite ratio. The combined effects of high acidification and warming on the key response of byssus strength caused a strong decline in mussel performance, although only in Galician mussels, in which the valve opening time decreased sharply as well as condition index (soft tissue state) and shell growth. By contrast, the observed negative effect of highly acidified scenario on the strength of Tunisian mussel shells was (partly but not totally) counterbalanced by the higher seawater temperature. Eco-physiological and behavioural interactions in mussels in relation to climate change are complex, and future scenarios for the ecology of the species and also the feasibility of cultivating them in Atlantic and Mediterranean zones are discussed.
评估了模拟海水酸化和变暖条件对分别适应地中海（突尼斯）和大西洋（西班牙西北部加利西亚）截然不同、相距甚远地点的贻贝样本关键行为和生态生理参数的影响。在为期2个月的实验条件暴露期间，贻贝被给予最佳喂养，以确保气候变化驱动因素与个体能量状态之间不存在协同相互作用。总体而言，无论来源（大西洋或地中海）如何，在所考虑的大多数参数方面，贻贝对酸化具有相当的适应能力，并且它们能够通过增加摄食活动在强酸化海水中生长。然而，在中度和高度酸化海水中养殖的两个贻贝种群中，贝壳强度均持续下降（40%）。观察到的贝壳强度降低不能用有机质、贝壳厚度或文石：方解石比例的轻微变化来解释。高酸化和变暖对足丝强度关键反应的综合影响导致贻贝性能大幅下降，不过仅在加利西亚贻贝中出现这种情况，其中瓣膜张开时间急剧减少，同时状况指数（软组织状态）和贝壳生长也受到影响。相比之下，高酸化情景对突尼斯贻贝贝壳强度的负面影响（部分但并非完全）被较高的海水温度所抵消。贻贝中与气候变化相关的生态生理和行为相互作用是复杂的，并且讨论了该物种生态学的未来情景以及在大西洋和地中海区域养殖它们的可行性。
