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Morphological differences yet genetic similarity among seasonal cohorts of Japanese anchovy during the early life stages in the Kii Channel

Published online by Cambridge University Press:  29 October 2024

Naotaka Yasue*
Affiliation:
Wakayama Prefectural Fisheries Experimental Station, Wakayama, Japan
Takashi Yanagimoto
Affiliation:
Fisheries Stock Assessment Center, Fisheries Resource Institute, Fisheries Research and Education Agency, Kanagawa, Japan
Daiki Noguchi
Affiliation:
Laboratory of DNA Polymorphism, Nippon Total Science Inc., Hiroshima, Japan
Akinori Takasuka
Affiliation:
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, the University of Tokyo, Tokyo, Japan
*
Corresponding author: Naotaka Yasue; Email: yasue_n0001@pref.wakayama.lg.jp

Abstract

Species in the genus Engraulis show extensive intraspecific as well as interspecific morphological and genetic diversity. Since morphological differences do not necessarily correspond to genetic differences, it is necessary to clarify the relationship between morphological differences and genetic differences for a better understanding of the population structure. Fish morphology at a given standard length differs between cohorts of Japanese anchovy Engraulis japonicus during the early life stages in the Kii Channel, but it is unknown whether the differences are caused by genetic differences or not. The Kii Channel includes the boundary between the Pacific (southern side of the Kii Channel) and the Seto Inland Sea stocks (northern side), but stock separation is based primarily on demographic characteristics. In the present study, genetic analyses were conducted to examine the genetic differences among samples (month and area) based on mitochondrial DNA cytochrome b region (Cyt b), control region (CR) and microsatellite markers. AMOVA revealed that the percentage of genetic variation among samples was low at 0.11% for Cyt b, 0.30% for CR and 0.00% for microsatellite, and no significant genetic variation was observed among samples. Although two clades were identified in the unrooted neighbour-joining tree for Cyt b and CR, both Cyt b and CR sequences were similar between months and between areas. Accordingly, the morphological differences among cohorts can be attributed to phenotypic plasticity. Additionally, there were no genetic differences between samples from the southern side and the northern side of the Kii Channel, suggesting strong genetic connectivity in these areas.

Information

Type
Research Article
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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