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MICROSATELLITE MARKERS REVEAL POPULATION GENETIC STRUCTURE OF THE TOXIC DINOFLAGELLATE ALEXANDRIUM TAMARENSE (DINOPHYCEAE) IN JAPANESE COASTAL WATERS 1
Author(s) -
Nagai Satoshi,
Lian Chunlan,
Yamaguchi Sanae,
Hamaguchi Masami,
Matsuyama Yukihiko,
Itakura Shigeru,
Shimada Hiroshi,
Kaga Shinnosuke,
Yamauchi Hiroyuki,
Sonda Yoshiko,
Nishikawa Tetsuya,
Kim ChangHoon,
Hogetsu Taizo
Publication year - 2007
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.2006.00304.x
Subject(s) - biology , biological dispersal , genetic structure , alexandrium tamarense , gene flow , dinophyceae , genetic diversity , isolation by distance , population , microsatellite , ecology , dinoflagellate , population genetics , evolutionary biology , zoology , genetic variation , genetics , allele , gene , algal bloom , phytoplankton , demography , sociology , nutrient
This is the first report to explore the fine‐scale diversity, population genetic structure, and biogeography of a typical planktonic microbe in Japanese and Korean coastal waters and also to try to detect the impact of natural and human‐assisted dispersals on the genetic structure and gene flow in a toxic dinoflagellate species. Here we present the genetic analysis of Alexandrium tamarense (Lebour) Balech populations from 10 sites along the Japanese and Korean coasts. We used nine microsatellite loci, which varied widely in number of alleles and gene diversity across populations. The analysis revealed that Nei's genetic distance correlated significantly with geographic distance in pair‐wise comparisons, and that there was genetic differentiation in about half of 45 pair‐wise populations. These results clearly indicate genetic isolation among populations according to geographic distance and restricted gene flow via natural dispersal through tidal currents among the populations. On the other hand, high P ‐values in Fisher's combined test were detected in five pair‐wise populations, suggesting similar genetic structure and a close genetic relationship between the populations. These findings suggest that the genetic structure of Japanese A. tamarense populations has been disturbed, possibly by human‐assisted dispersal, which has resulted in gene flow between geographically separated populations.