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Parthenogenetic Alien Crayfish (Decapoda: Cambaridae) Spreading in Madagascar

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Abstract Invasion of an alien freshwater crayfish is newly confirmed in Madagascar. The invasive crayfish is determined as the parthenogenetic Marmorkrebs (marbled crayfish) (Cambaridae: Decapoda) on the basis of morphological features and the fact that all collected specimens were females regardless of their size. As this is a worrisome finding, the public should be alerted so that spread on the island can be prevented before it affects the vulnerable native crayfish biodiversity and the rice field business in Madagascar.

Affiliations: 1: a Hokkaido Wakkanai Fisheries Experimental Station, 4-5-15 Suehiro, Wakkanai, Hokkaido 097-0001, Japan ; 2: b Humboldt-Universität zu Berlin, Institut für Biologie/Vergleichende Zoologie, Philippstr. 13, 10115 Berlin, Germany ; 3: c Japan International Research Centre for Agricultural Sciences, Owashi 1-1, Tsukuba 305-8686, Japan ; 4: d Hafakeyly, Lot 177 bis cite des 67ha sud, Antananarivo 101, Madagascar ; 5: e Gotenstr. 16, 71336 Bittenfeld, Germany


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