Genetic and Morphological Characteristics in the Local Population of the Landlocked Salmon Oncorhynchus masou Originally Distributed in Kanagawa Prefecture, Japan
Oncorhynchus masou , including subspecies of Oncorhynchus masou masou (yamame) and Oncorhynchus masou ishikawae (amago), is one of the salmonid groups impacted by human activity such as dam construction and release of non-native salmonids. In this study, we investigated the genetic structure of O. m...
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Published in | Marine biotechnology (New York, N.Y.) Vol. 22; no. 6; pp. 812 - 823 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.12.2020
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Oncorhynchus masou
, including subspecies of
Oncorhynchus masou masou
(yamame) and
Oncorhynchus masou ishikawae
(amago), is one of the salmonid groups impacted by human activity such as dam construction and release of non-native salmonids. In this study, we investigated the genetic structure of
O. masou
populations in the Sakawa and Sagami Rivers, Japan, by sequencing the mitochondrial control region. We hoped to identify genetically the
O. masou
populations specific to and originally native to Kanagawa Prefecture, where the two subspecies are thought to be present. The populations found in the upstream tributaries, where there has been no human impact and no upstream migration of fishes, were assumed to be descendants of the local
O. masou
populations in both river systems, and the morphological features seen here were similar to amago and yamame. However, both populations were genetically related to amago. In addition, only six haplotypes were detected in 315 individuals collected from 20 localities in the two river systems. Furthermore, haplotype diversity and nucleotide diversity of these populations were low, and high
F
st
values were observed. These results suggest that the population size is restricted and genetic diversity is decreasing in the
O. masou
populations of the Sakawa and Sagami Rivers. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1436-2228 1436-2236 |
DOI: | 10.1007/s10126-020-09975-2 |