Multiregional introgressions inferred from the mitochondrial DNA phylogeny of a hybridizing species complex of gobiid fishes, genus Tridentiger |
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Authors: | Mukai T; Naruse K; Sato T; Shima A; Morisawa M |
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Institution: | Misaki Marine Biological Station, University of Tokyo, Kanagawa, Japan. mukai@mmbs.s.u-tokyo.ac.jp |
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Abstract: | Partial sequences of the cytochrome b gene (402 bp) in mtDNA were
determined for brackishwater gobiid fishes, genus Tridentiger, collected
from geographically distant locations in the Japanese Archipelago, and
their interspecific and geographic variations were analyzed and compared.
Contrary to the results of a previous allozyme analysis which revealed the
existence of considerable genetic divergence (Nei's genetic distance >
0.5) between T. obscurus and T. brevispinis, the mtDNA haplotypes
(mitotypes) of these two species were very similar and could not be
distinguished by any of the neighbor- joining, maximum-likelihood or
parsimony analyses. Hybrid individuals between the two species were also
found, with several mitotypes being shared by both species and their
hybrids. The phylogenetic relationships of mitotypes were divided into
three subgroups, the geographical distributions of the latter being allied
to geographical features of the Archipelago. These results suggested the
occurrence of multiregional introgression between the two species, with
mitotypes transferring from one species to the other.
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