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Female adult of the water flea Daphnia magna by Hajime Watanabe | by dullhunk
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Female adult of the water flea Daphnia magna by Hajime Watanabe

Daphnia magna is a freshwater crustacean. Normal, healthy populations are entirely parthenogenetic female. However, decline in environmental quality of the habitat leads to the clonal production of males, which allows sexual reproduction. This is known as environmental sex determination (see Kato et al., dx.doi.org/10.1371/journal.pgen.1001345

 

Image Credit: Hajime Watanabe dx.doi.org/10.1371/image.pgen.v07.i03 see en.wikipedia.org/wiki/Daphnia_magna

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Taken on March 15, 2011