Graduate Thesis Or Dissertation
 

Experimental interbreeding between Atlantic and Pacific populations of the marine calanoid copepod Acartia clausi Giesbrecht

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  • An attempt has been made to experimentally interbreed Atlantic and Pacific populations of the marine calanoid copepod Acartia clausi Giesbrecht. Breeding between individuals from each population produced many successive generations in the laboratory, but interbreeding between populations failed to produce viable offspring. This result is strong evidence that the Atlantic and Pacific populations of A. clausi have diverged enough to become reproductively isolated. Assignment of specific rank to differentiate both populations is suggested. Some morphological and ecological differences between Atlantic and Pacific populations of A. clausi were observed. Further studies are proposed to evaluate the constancy of these differences, and their possible use for the recognition of Pacific and Atlantic A. clausi. Observations are presented on the general problems of copepod culture work.
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