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Laboratory of Entomology, Wageningen University, P. Hunt exeter. Use the link below to share a full-text version of this article with your friends and colleagues. Learn more.

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Crassostrea oysters show intraspecific variation in sexuality, including dioecy as well as sequential and simultaneous hermaphroditism, but their sexuality under natural conditions has rarely been reported. We examined sexuality and the effects of body size and gregariousness on sexuality in a natural population of the Pacific oyster C. First, monthly samplings were made during their reproductive season May—August to study the sex of wild individuals.
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A properly dressed male guppy, with its gaudy blue spots and brilliant splashes of orange, can't help but stand out. But for a fish that spends its life swimming among predators, it seems that good camouflage would have a big advantage over colors that attract attention. If flashiness is a liability, why are these little guys such exhibitionists? To see the range of coloration that guppies exhibit in the wild, and to see their predators and habitats, check out the Guppy Gallery. When evolutionary biologist John Endler began studying Trinidad's wild guppies in the s, he was struck by the wide variation among guppies from different streams, even among guppies living in different parts of the same stream.
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