Genetic divergence, variation and zoogeography of a freshwater goby, Odontobutis obscura

Gene products of 18 allozyme loci from 995 Japanese donko (Odontobutis obscura, a freshwater goby) from 80 localities, were analyzed so as to determine the extent of genetic divergence and variation. The zoogeography of donko is discussed based on cluster and cladistic analyses. The first colonizati...

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Bibliographic Details
Published in:Ichthyological research 1998-01, Vol.45 (4), p.363-376
Main Authors: Sakai, H. (Shimonoseki Univ. of Fisheries, Yamaguchi (Japan)), Yamamoto, C, Iwata, A
Format: Article
Language:English
Subjects:
ALLOZYME
ALLOZYMES
ALOZIMAS
Aquatic ecosystems
BIOGEOGRAFIA
BIOGEOGRAPHIE
BIOGEOGRAPHY
Colonization
COURS D'EAU
CURSOS DE AGUA
Distribution records
Fish
Freshwater
Gene products
Genetic diversity
GENETIC VARIATION
Inland water environment
Marine biology
Marine fishes
Miocene
Odontobutis obscura
PALAEONTOLOGY
PALEONTOLOGIA
PALEONTOLOGIE
PERCOIDEI
Pliocene
RIVERS
VARIACION GENETICA
VARIATION GENETIQUE
Zoogeography
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Summary:Gene products of 18 allozyme loci from 995 Japanese donko (Odontobutis obscura, a freshwater goby) from 80 localities, were analyzed so as to determine the extent of genetic divergence and variation. The zoogeography of donko is discussed based on cluster and cladistic analyses. The first colonization of Japan by donko is thought to have occurred directly from China to the Second Setouchi Basin, a large freshwater system that existed in the Miocene and Pliocene epochs. Japanese donko subsequently formed five geographic groups:viz. West Kyushu, West Seto, East Seto, Sanin·Biwa·Ise and Hikimi Groups. The West and East Seto Groups apparently occurred in the West and East Setouchi Paleorivers, respectively, that flowed during the glacial age. Similarly, the Ariake Paleoriver might have included the West Kyushu Group. The Sanin·Biwa·Ise Group is heterogeneous, each population in the group being thought to have been isolated for a longer time than populations of the other groups, except the Hikimi Group. the last-mentioned, probably a relatively specialized group, has also been isolated for a long time. Some population invasions from the West and East Seto Groups toward the rivers of the San-in·Biwa·Ise and Hikimi Groups, probably caused by relatively recent piracies or spill-over between rivers, are recognized.
ISSN:1341-8998
1616-3915
DOI:10.1007/bf02725189