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Biol Bull 168: 419-431. (June 1985)
© 1985 Marine Biological Laboratory
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LATITUDINAL DIFFERENTIATION IN EMBRYONIC DURATION, EGG SIZE, AND NEWBORN SURVIVAL IN A HARPACTICOID COPEPOD

DARCY J. LONSDALE 1 and JEFFREY S. LEVINTON 1

1 Ecology and Evolution Department, State University of New York at Stony Brook, Stony Brook, New York 11794

We demonstrate significant genetically based differentiation in embryonic duration (h), egg size (µm3), and newborn survival (number/h) in the harpacticoid copepod, Scottolana canadensis (Crustacea), taken from a broad range of latitudes (°N) and reared in the laboratory for several generations under the same conditions. Egg development times of the northern-derived (ME) individuals were significantly longer at all test temperatures, and thus did not demonstrate compensation at low temperature. Maine development times may be due to the larger egg size.

Submitted on November 16, 1984
Accepted on March 15, 1985






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