Effect of parental phenotype on dispersal, growth and maturation of offspring in wild masu salmon (Oncorhynchus masou)

Yamamoto, T., Kitanishi, S. and Metcalfe, N. B. (2021) Effect of parental phenotype on dispersal, growth and maturation of offspring in wild masu salmon (Oncorhynchus masou). Evolutionary Ecology, 35(2), pp. 253-269. (doi: 10.1007/s10682-020-10098-2)

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Offspring traits are influenced by complex interactions among parent genotypes and phenotypes. However, ecological studies of these effects have tended to focus on one of either maternal or paternal influences. In this study, we investigated the effects of both parental phenotypes on offspring dispersal, growth and early sexual maturity in masu salmon. We used wild-caught parental fish in a half-sib mating design that allowed comparison of offspring from males of two different life-history types (precocious males that had lived only in fresh water and anadromous males that had migrated to the sea). These males were mated with anadromous females and the eggs planted in natural streams in three different years. Natal dispersal distance depended on offspring sex, body size and paternal life history: female offspring moved further downstream than males, whilst daughters of precocious fathers tended to move further downstream than those of anadromous sires. There was a maternal effect on offspring growth, with larger eggs resulting in larger offspring at least until these became precociously mature at the end of the first summer. However, while faster growing male offspring were more likely to become precociously mature, there was no evidence that the probability of precocious maturation was influenced by parental life history. We conclude that, although body size of young salmon was significantly influenced by egg size and there were sex differences in dispersal, their growth rate and divergence in life history types were mainly environmentally driven.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Metcalfe, Professor Neil and Yamamoto, Dr Toshiaki
Authors: Yamamoto, T., Kitanishi, S., and Metcalfe, N. B.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
Journal Name:Evolutionary Ecology
ISSN (Online):1573-8477
Copyright Holders:Copyright © The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature 2021
First Published:First published in Evolutionary Ecology 35(2): 253-269
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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