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Salinity tolerances of eastern oysters bred from native Louisiana broodstock
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2021
[PDF-453.41 KB]
Details:
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Alternative Title:UROP Project
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Personal Author:
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NOAA Program & Office:
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Sea Grant Program:
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Description:The objective of this project was to compare the tolerance of eastern oysters from different populations and of different ploidies to low salinity events that are increasing in frequency in Louisiana estuaries. Oysters from three different stocks, collected from three different sites in Louisiana, as well as diploid and triploid oysters for each stock, for a total of 6 groups, were placed in tanks with salinities of 2, 4, 20, and 36. The oysters’ cumulative mortality, condition index, and osmolality was tracked over a 52-day period. Mortality was significantly higher in the tank with a salinity of 2 but there were no significant differences observed between groups within that tank. Oyster health, evaluated by measuring condition index and osmolality, was also not affected by stock or ploidy in most of the salinity treatments. The lack of difference between stocks for cumulative mortality indicates that adaptive evolution due to different salinity conditions among sites did not have a large enough effect to impact mortality at set salinities. The physiological differences between diploids and triploids additionally did not have a large enough effect to impact mortality at set salinities. Future experiments could examine if these observations would hold true with rapid changes in salinity or with consistent salinity changes.
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Document Type:
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Rights Information:Public Domain
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Compliance:Submitted
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