Sex-specific patterns of lifetime reproductive success in single and repeat breeding steelhead trout (Oncorhynchus mykiss)

All other things being equal, the lifetime reproductive success (LRS) of iteroparous and semelparous individuals should scale with the number of breeding seasons. Deviations from this relationship may occur for many reasons, including age- or size-related fecundity or life history trade-offs, which...

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Bibliographic Details
Published in:Behavioral ecology and sociobiology 2010-03, Vol.64 (4), p.505-513
Main Authors: Seamons, Todd R, Quinn, Thomas P
Format: Article
Language:English
Subjects:
Anadromous fishes
Animal Ecology
Animal populations
Animal reproduction
Behavioral Sciences
Biomedical and Life Sciences
Body size
Brackish
Breeding seasons
Evolution
Fecundity
Female animals
Females
Fish scales
Freshwater
Gender
Life history
Life Sciences
Male animals
Marine
Marine fishes
Offspring
Oncorhynchus mykiss
Original Paper
Reproduction
Reproductive success
Salmon
Seasons
Spawning
Trout
Zoology
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Summary:All other things being equal, the lifetime reproductive success (LRS) of iteroparous and semelparous individuals should scale with the number of breeding seasons. Deviations from this relationship may occur for many reasons, including age- or size-related fecundity or life history trade-offs, which may differ between sexes. We used 19 brood years of DNA parentage analysis in a small (N = 4-143 year⁻¹) wild, unexploited population of steelhead trout (Oncorhynchus mykiss) to compare the LRS of individuals that spawned only once [“one time spawners” (OTS), N = 355 male, 371 female] to those spawning twice [“repeat spawners” (RPS), N = 13 male, 49 female]. Female RPS had nearly twice the LRS of female OTS (1.17 offspring per female vs 0.91 offspring per female), whereas male RPS had nearly three times the LRS of male OTS (1.54 offspring per male vs 0.57 offspring per male). Female RPS produced slightly more adult offspring during their second breeding season than their first (0.78 vs 0.82 offspring per female); however, male RPS produced all of their adult offspring in their second breeding season (0 vs 1.54 offspring per male). The additional growth in body size of males between breeding seasons may give them an advantage in their second breeding season, but the lack of offspring produced in their first season suggests a trade-off between survival and future reproduction that was not expressed in females.
ISSN:0340-5443
1432-0762
DOI:10.1007/s00265-009-0866-7