Taxonomic uncertainty of a highly endangered brook damselfly, Copera tokyoensis Asahina, 1948 (Odonata: Platycnemididae), revealed by the mitochondrial gene genealogy
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In the Japanese main islands, two brook damselfly species are sympatrically distributed. One is highly endangered damselfly, Copera tokyoensis, Asahina, 1948, and the other is a congeneric common species, C. annulata (Selys, 1863). Mitochondrial gene genealogy reconstructed by the maximum likelihood method showed that they are not reciprocally monophyletic. These two congeneric species might have experienced mitochondrial introgressions possibly through hybridizations. The effect of hybridization against endangered species is generally poorly understood. Taxonomic uncertainty might also explain this situation because extremely dispersed pattern of the haplotype network could not be appeared by once or twice hybridization. Three closely located populations of C. tokyoensis in the Kanto district showed significant population differentiation. It might suggest the low dispersal tendency of this endangered species.
KeywordsCopera Brook damselfly Odonata Taxonomic uncertainty
Kiyoshi, Takahashi and Tsubaki were financially supported in part by the Global Center of Excellence Program “Formation of a Strategic Base for Biodiversity and Evolutionary Research: from Genome to Ecosystem” of the Ministry of Education, Culture, Sports and Technology (MEXT), Japan. Yamanaka, Tanaka and Hamasaki were supported in part by a Grant-in-Aid for project research on Developing Technology for Coexisting with Nature within Agro-forest and Aquatic Watershed Landscapes, from the Ministry of Agriculture, Forestry and Fisheries of Japan.
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