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Individual variation in early life‐history traits in brown trout
Author(s) -
Vøllestad L. A.,
Lillehammer T.
Publication year - 2000
Publication title -
ecology of freshwater fish
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 55
eISSN - 1600-0633
pISSN - 0906-6691
DOI - 10.1111/j.1600-0633.2000.eff090407.x
Subject(s) - biology , brown trout , salmo , life history theory , hatching , reproduction , human fertilization , selection (genetic algorithm) , maternal effect , heritability , zoology , genetic variation , ecology , life history , fish <actinopterygii> , offspring , evolutionary biology , genetics , gene , fishery , pregnancy , artificial intelligence , computer science
– We studied the variability of early life history traits in individually raised progeny of brown trout Salmo trutta L. Eggs from two dams were each fertilized with sperm from 10 sires, producing 20 full‐sib families. Each individual progeny was followed from fertilization until death without exogenous food. Egg size was positively correlated with a number of life‐history traits, especially length and yolk sac volume at hatching and length at death, and these traits were strongly influenced by maternal effects. We found significant additive genetic variance for growth rate, length at death and life span without external food. Thus these early life‐history traits may be modulated by natural selection. We found positive phenotypic and genetic correlations between most early life‐history traits. However, life span without external food was negatively correlated with growth rate, indicating a genetic trade‐off. Note