, Volume 7, Issue 1, pp 11-24

On the reproductive biology of Ceratoserolis trilobitoides (crustacea: isopoda): Latitudinal variation of fecundity and embryonic development

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The embryonic development of Ceratoserolis trilobitoides (Crustacea: Isopoda) is described. It is estimated that breeding lasts nearly 2 years. In comparison with non-polar isopods 3 causes for the retardation of embryonic development are discussed: genetically fixed adaptations to the polar environment, the physiological effect of temperature and the effect of egg size. The latter seems to be of minor importance. Intraspecific variations of fecundity are found in populations from the Weddell Sea, the largest eggs occur in the coldest region. The distribution of physiological races corresponds to the distribution of morphotypes.