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The Biological Bulletin, Vol 187, Issue 1 99-111, Copyright © 1994 by Marine Biological Laboratory

SEX CHANGE IN INVERTEBRATES

Protogynous Sex Change in the Intertidal Isopod Gnorimosphaeroma oregonense (Crustacea: Isopoda)

H. J. Brook, T. A. Rawlings and R. W. Davies
Bamfield Marine Station, Bamfield, British Columbia, Canada, VOR IBO of Biological Sciences, University of Calgary, Calgary, Alberta, Canada T2N 1N4

In Crustacea, the dominant pattern of sequential hermaphroditism is protandry (sex change from male to female). Here we provide the first evidence from external morphology and population structure that Gnorimosphaeroma oregonense, an abundant, sexually dimorphic intertidal isopod, undergoes protogynous (female to male) sex change. In the field, 31% of females had rudimentary penes, suggesting sex change and laboratory growth experiments confirmed that females produced one brood of juveniles, then passed through a variable number of molts as immature males before becoming sexually mature males. Contrary to reports for other protogynous Crustacea, this study suggests that in G. oregonense sex change is not socially mediated, although it may be facultative, because a large percentage of laboratory-reared juvenile isopods developed directly into males. Potential adaptive explanations for protogyny are discussed in relation to protandry--the more common strategy in Crustacea.




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Copyright © 1994 by the Marine Biological Laboratory.