A note on the effects of abnormally low temperature on the Carolina marsh clam |
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| Authors: | Courtney T Hackney |
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| Institution: | 1. Department of Biological Sciences, University of North Carolina at Wilmington, 28406, Wilmington, North Carolina
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| Abstract: | Populations of the Carolina Marsh Clam,Polymesoda caroliniana, suffered high mortality in southeastern North Carolina during the winters of 1983–84 and 1984–85. Adult populations in brackish marshes in the Cape Fear estuary suffered 33% mortality in 1983 and 38% in 1985. Some data suggest that more flooded areas suffered less mortality. A laboratory experiment found that some clams died after only 4 h exposure to 0 to ?1°C. LT50 occurred after only 6.3 h and no individuals survived 24 h exposure. Cold intolerance is suggested as the primary limiting factor in its northern distribution. |
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