LATITUDINAL DIFFERENTIATION IN EMBRYONIC DURATION, EGG SIZE, AND NEWBORN SURVIVAL IN A HARPACTICOID COPEPOD

Open Access

1 June 1985

journal article
research article
Published by University of Chicago Press in The Biological Bulletin

Vol. 168 (3) , 419-431
https://doi.org/10.2307/1541522

Abstract

Significant genetically based differentiation in embryonic duration (h), egg size (.mu.m3) and newborn survival (number/h) is demonstrated in the harpacticoid copepod, Scottolana canadensis (Crustacea), taken from a broad range of latitudes (.degree.N [north]) 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 [USA] development times may be due to the larger egg size.

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