Fine scale relationships between sex, life history, and dispersal of masu salmon

Ecology and Evolution

Shigeru Kitanishi¹  Toshiaki Yamamoto⁴  Itsuro Koizumi³  Jason B. Dunham² 

[1] College of Life Sciences, Ritsumeikan University, Noji-higashi, Kusatsu, Shiga 525-8577, Japan;U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, Corvallis, Oregon 97331;Creative Research Institution, Hokkaido University, N21W10 Sapporo, Hokkaido 001-0021, Japan;Department of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Musashino, Tokyo 180-8602, Japan

关键词: Alternative strategy;    gene flow;    life‐history polymorphism;    microsatellite DNA;    Oncorhynchus masou;    sex‐biased dispersal;    spatial genetic structure;   

DOI  :  10.1002/ece3.228

来源: Wiley

【 摘 要 】

Abstract

Identifying the patterns and processes driving dispersal is critical for understanding population structure and dynamics. In many organisms, sex-biased dispersal is related to the type of mating system. Considerably, less is known about the influence of life-history variability on dispersal. Here we investigated patterns of dispersal in masu salmon (Oncorhynchus masou) to evaluate influences of sex and life history on dispersal. As expected, assignment tests and isolation by distance analysis revealed that dispersal of marine-migratory masu salmon was male-biased. However, dispersal of resident and migratory males did not follow our expectation and marine-migratory individuals dispersed more than residents. This may be because direct competition between marine-migratory and resident males is weak or that the cost of dispersal is smaller for marine-migratory individuals. This study revealed that both sex and migratory life-history influence patterns of dispersal at a local scale in masu salmon.

【 授权许可】

CC BY-NC   
© 2011 The Authors. MicrobiologyOpen published by Blackwell Publishing Ltd.

Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.