Ocean acidification shifts carbonate chemistry heterogeneity in molluscan respiratory microenvironments

文献类型： 外文期刊

第一作者： Li, Jiaqi

作者： Li, Jiaqi

作者机构：

关键词： Ocean acidification; Mollusc; Microenvironment; Carbonate system; Spatial heterogeneity

期刊名称：MARINE POLLUTION BULLETIN （ 影响因子：4.9； 五年影响因子：5.6 ）

ISSN： 0025-326X

年卷期： 2025 年 216 卷

页码：

收录情况： SCI

摘要： Ocean acidification (OA) poses a threat to marine calcifiers by modifying carbonate chemistry in ambient seawater, where localized fluctuations exert more immediate physiological impacts than bulk seawater changes. We investigated the heterogeneity of carbonate chemistry parameters (pH, DIC, pCO(2), TA-DIC) within the respiratory microenvironments (RE) of four molluscan species (Mytilus galloprovincialis, Haliotis discus hannai, Chlamys farreri, Crassostrea gigas) under ambient (pH 8.1) and OA conditions (pH 7.8). Our results demonstrated that regardless of bulk seawater pH, RE consistently exhibited significantly elevated dissolved inorganic carbon (DIC) and pCO(2) levels, coupled with reduced pH and lower TA-DIC ratios compared to bulk seawater (P < 0.05). Notably, H. discus hannai displayed the most pronounced RE modifications, with the highest DIC and pCO(2), alongside the lowest pH and TA-DIC values among studied species, revealing distinct interspecific variability. Acute OA exposure significantly increased pCO(2) heterogeneity (P < 0.05) while decreasing pH, DIC, and TA-DIC heterogeneity within the RE of three species (C. farreri, C. gigas, and H. discus hannai), suggesting suppressed CO2 excretion capacity under rapid acidification stress. Prolonged OA exposure progressively enhanced spatial heterogeneity in DIC and pCO(2) levels, indicating physiological acclimation to facilitate metabolic CO2 excretion. A critical finding was the accelerated pCO(2) increasing rate in RE compared to bulk seawater during OA stress, this steep elevation in pCO(2) level in RE may require extra-efforts to facilitate CO2 excretion. These findings provide insights into the mechanistic links between OA-driven carbonate chemistry modifications and molluscan respiratory physiology, highlighting species-specific vulnerability patterns and adaptive responses.

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