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1 October 2011 Geographical Distributions of Mitochondrial DNA Lineages Reflect Ancient Directions of River Flow: A Case Study of the Japanese Freshwater Shrimp Neocaridina denticulata denticulata (Decapoda: Atyidae)
Junta Fujita, Kouji Nakayama, Yoshiaki Kai, Masahiro Ueno, Yoh Yamashita
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Abstract

The mitochondrial DNA phylogeographical structure of the freshwater atyid shrimp Neocaridina denticulata denticulata was investigated near the Yura and Kako Rivers in western Japan. To assess the biological significance of drainage evolution, fragments of 390 base pairs (bp) extending from the NADH dehydrogenase subunit 2 gene to the tryptophan transfer RNA gene were sequenced for 246 specimens from twenty locations. The phylogenetic tree detected two distinct clades corresponding to the region along the Sea of Japan and Seto Inland Sea, respectively. Geographical mapping of the two clades well reflected the river capture, in which the upper reaches of the Yura River draining into the Sea of Japan had been captured from the Kako River into the Seto Inland Sea. The clear pattern of mitochondrial DNA distribution may be accounted for by the ecological characteristics of species that minimize passive downstream drift, local adaptation, and mountain topography.

© 2011 Zoological Society of Japan
Junta Fujita, Kouji Nakayama, Yoshiaki Kai, Masahiro Ueno, and Yoh Yamashita "Geographical Distributions of Mitochondrial DNA Lineages Reflect Ancient Directions of River Flow: A Case Study of the Japanese Freshwater Shrimp Neocaridina denticulata denticulata (Decapoda: Atyidae)," Zoological Science 28(10), 712-718, (1 October 2011). https://doi.org/10.2108/zsj.28.712
Received: 3 January 2011; Accepted: 1 March 2011; Published: 1 October 2011
KEYWORDS
dispersal ability
freshwater shrimp
great divide
mitochondrial DNA phylogeography
Neocaridina denticulata denticulata
river capture
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