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Biol Bull 127: 108-118. (August 1964)
© 1964 Marine Biological Laboratory
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THE SALINITY TOLERANCES OF SOME ESTUARINE PLANKTONIC CRUSTACEANS

JOAN LANCE 1

1 Department of Zoology, University of Hull, England

1. The salinity tolerances of copepods varied according to the stage in the life-history. Adult males were less resistant to dilution than females (Acartia discaudata, A. clausi, Centropages hamatus), while copepodites appeared to be slightly less tolerant than adult females (Acartia tonsa, A. bifilosa).

2. Carcinus maenas zoeae showed a higher mortality in diluted sea water than the megalopa stages, whereas Porcellana longicornis zoeae were more tolerant than the post larvae.

3. The moulting of Carcinus megalopas and Porcellana zoeae into crabs and post larvae, respectively, and the development of Elminius modestus nauplii into cyprids were prevented or delayed by water of low salinity.

4. The salinity tolerances of important members of the zooplankton of Southampton Water were compared.






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Copyright © 1964 by the Marine Biological Laboratory.