Temporal variation of population genetic structure of the Japanese eel (Anguilla japonica) elvers in the estuary of northern Taiwan
Date Issued
2005
Date
2005
Author(s)
Chang, Kai-Chieh
DOI
zh-TW
Abstract
Japanese eel Anguilla japonica is a catadromous fish, widely distributed in northeastern Asia, south from Taiwan, through mainland China, Korea and north to Japan. The spawning ground of the eel is located in the west of Mariana Islands (15°N, 140°E). The leaf-like larve leptocephali are drifted westward with North Equatorial Current and then turn northward with Kuroshio near Philippines. At arriving continental shelf, they metamorphose to glass eel, and become pigmented elver in the estuaries. Japanese eel is presumed not a single population due to their broad distribution. Previous studies based on Isozymes analyses found a geographic decline in the population of Japanese eel, but the results from mitochondrial DNA analyses found no significant differences among population genetic structure and concluded that Japanese eel is a panmictic population. Moreover, recent study by microsatellite DNA indicates that they may have different spawning populations among different locations but the temporal genetic variation still remained controversial.
According to the otolith daily growth increments study, backcalculated hatching date discovered that elvers recruit to Taiwan coast at different winter months were spawned by different stocks. Therefore, present study aims to use polymorphic microsatellite loci in the genomic DNA to examine the temporal variation of population genetic structure of the eel in Taiwan. The Japanese eel elvers were collected at 4 consecutive months between November 2000 and March 2001 from the estuary of Tanshui River in Taiwan. The mean observed heterozygosity (H0) and change in the total number of alleles were compared among months. The genetic differentiation indices indicate that the difference in genetic structure was not significant among months (FST=0.001, P= 0.482). This implies that the elvers recruited to the estuary of north Taiwan in the different months were coming from the same spawning population. The population structure of Japanese eel elvers appearing in northern Taiwan remained temporally constant in the same geographic region among months.
Subjects
日本鰻
微衛星
DNA 族群
Japanese eel
microsatellites DNA
population
Type
other
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