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Sexual maturity increases mobility and heterogeneity in individual space use in Atlantic salmon ( Salmo salar ) parr
Author(s) -
Bouchard Colin,
Lange Frédéric,
Guéraud François,
Rives Jacques,
Tentelier Cédric
Publication year - 2020
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.14282
Subject(s) - salmo , biology , sexual maturity , facultative , ecology , range (aeronautics) , upstream (networking) , demography , zoology , fishery , fish <actinopterygii> , materials science , composite material , computer network , sociology , computer science
We assessed the effects of sexual maturity on space use in Atlantic salmon ( Salmo salar ) parr as facultative early maturation enables us to work on individuals belonging to the same cohort. We monitored the space use of 40 1‐year‐old males in natura throughout a breeding season. First, mature individuals covered longer distances (absolute and upstream) and located within broader home ranges than immature parr. Second, sexual maturity also generated a higher interindividual variability in space use. Finally, mature individuals exhibited a higher probability of association with likely breeding sites on average. However, some mature individuals experienced a lower probability than immature individuals, suggesting that the space use of some mature individuals may not be optimal. Moreover, mature parr exploiting a broader home range or covering longer upstream distances had a higher probability of association with likely breeding sites. Covering longer upstream distances may therefore increase the reproductive success of mature parr, while involving higher energetic costs and a greater risk of predation.