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THE HYPOXIC TOLERANCE OF THE PROTOBRANCH BIVALVE NUCULA SULCATA BRONN

Abstract Examination of the hypoxic tolerance of Nucula sulcata determined that the mean survival time under hypoxia was 9.57 d with a maximum longevity of 30 d. Comparison between the three species, N. sulcata, N. nitidosa, and N. nucleus reveals that N. sulcata is the most tolerant of hypoxia followed by N. nucleus and N. nitidosa. It is suggested that the hypoxic tolerance of the species is a reflection of the normal habitat they occupy.