Sexual maturity increases mobility and heterogeneity in individual space use in Atlantic salmon (Salmo salar) parr.

Abstract:

: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.

journal_name

J Fish Biol

journal_title

Journal of fish biology

authors

Bouchard C,Lange F,Guéraud F,Rives J,Tentelier C

doi

10.1111/jfb.14282

subject

Has Abstract

pub_date

2020-04-01 00:00:00

pages

925-938

issue

4

eissn

0022-1112

issn

1095-8649

journal_volume

96

pub_type

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