期刊
MARINE ENVIRONMENTAL RESEARCH
卷 135, 期 -, 页码 103-113出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2017.12.017
关键词
Extracellular pH; Hemolymph; PCO2; Oxygen consumption; Gill; Mantle; Molluscs; Saccostrea glomerata; Growth; Adaptation
资金
- DAAD (German Academic Exchange Service) scholarship
- German Federal Ministry of Education and Research (BMBF) [FKZ 03F0655B]
- Australian Research Council [IN140100025]
- Australian Research Council [IN140100025] Funding Source: Australian Research Council
Understanding mechanisms of intraspecific variation in resilience to environmental drivers is key to predict species' adaptive potential. Recent studies show a higher CO2 resilience of Sydney rock oysters selectively bred for increased growth and disease resistance ('selected oysters') compared to the wild population. We tested whether the higher resilience of selected oysters correlates with an increased ability to compensate for CO2-induced acid-base disturbances. After 7 weeks of exposure to elevated seawater PCO2 (1100 mu atm), wild oysters had a lower extracellular pH (pH(e) = 7.54 +/- 0.02 (control) vs. 7.40 +/- 0.03 (elevated PCO2)) and increased hemolymph PCO2 whereas extracellular acid-base status of selected oysters remained unaffected. However, differing pH, values between oyster types were not linked to altered metabolic costs of major ion regulators (Na+/K+-ATPase, H+-ATPase and Na+/H+-exchanger) in gill and mantle tissues. Our findings suggest that selected oysters possess an increased systemic capacity to eliminate metabolic CO2, possibly through higher and energetically more efficient filtration rates and associated gas exchange. Thus, effective filtration and CO2 resilience might be positively correlated traits in oysters.
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