Sexual Form Alternation Occurs in Female
Red Swamp Crayfish
Adult males of Procambarus clarkii
exhibit a unique reproductive strategy, showing a cyclical dimorphism
between two sexual morphotypes; reproductive form I has large chelae
and non-reproductive form II has small chelae. However, whether P. clarkii females have two sexual
morphotypes and exhibit form alternation has not been resolved. We
employed allometric growth analysis on the chelae dimensions of P. clarkii females and males. Our
analysis demonstrated the existence of two sexual forms in P. clarkii females and highlighted
the intra- and inter-sexual dimorphisms in the chelae of this species.
We successfully traced the reproductive cycle of the P. clarkii population by examining
the occurrence patterns of sexual forms and suggested that crayfish may
exhibit the size-dependent moulting and form alternations.
Read the full article, published by Zoological
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