Impact of acute ocean acidification on survival and condition index in Pinctada mazatlanica, Megapitaria squalida and Modiolus capax.
Keywords:
ocean acidification, bivalves, LC50, survival, condition indexAbstract
Climate change and ocean acidification have emerged as global concerns, with mollusks identified as particularly susceptible to their impacts. The initial method to assess animal responses to acute stress involves evaluating their survival and Condition Index (CI). In this study, we investigated these responses in three high-value shellfish species —Pacific pearl oyster Pinctada mazatlanica (Pteriidae), Chocolate clam Megapitaria squalida (Veneridae), and Fat horse mussel Modiolus capax (Mytilidae)— across three seawater pH levels (8.1, 7.5, and 6.9). Survival rates in the pearl oyster remained unaffected by acute exposure to acidified seawater, whereas survival in the chocolate clam decreased to 91.7% at the lowest pH level, and in the mussel, it further declined to 75%. Although significant differences in CI were observed between species, no differences were noted across pH treatments. This suggests that, at least in the short term, these bivalve species appear capable of tolerating ocean acidification.
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