Patterns of sperm swimming behaviour depend on male mating tactic and spawning environment in chinook salmon

Many species exhibit alternative mating tactics (ARTs), with larger socially dominant males competing for females and smaller males adopting “sneaker” strategies to exploit fertilisation opportunities without competition or courtship. Females typically prefer larger socially dominant males, but thei...

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Bibliographic Details
Published in:Scientific reports 2024-10, Vol.14 (1), p.25680-8, Article 25680
Main Authors: Rosengrave, Patrice C., Lymbery, Rowan A., Evans, Jonathan P.
Format: Article
Language:English
Subjects:
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Alternative male mating tactics, cryptic female choice
Animals
Courtship
Female
Females
Fertilization
Humanities and Social Sciences
Male
Males
Mating
Mating behavior
multidisciplinary
Reproduction - physiology
Rivers
Salmon
Salmon - physiology
Science
Science (multidisciplinary)
Sexual Behavior, Animal - physiology
Sexual selection, sperm motility
Spawning
Sperm
Sperm competition
Sperm Motility - physiology
Spermatozoa - physiology
Swimming behavior
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Summary:Many species exhibit alternative mating tactics (ARTs), with larger socially dominant males competing for females and smaller males adopting “sneaker” strategies to exploit fertilisation opportunities without competition or courtship. Females typically prefer larger socially dominant males, but their ability to manipulate mating or fertilisation outcomes is largely unknown. Here, using chinook salmon Oncorhynchus tshawytscha , we examined whether the female’s ovarian fluid (OF) differentially influences the temporal patterns of sperm swimming traits in ejaculates from non-preferred sneaker (‘parr’) and preferred (dominant) males. Results demonstrate that OF improves sperm swimming speed and linearity compared to river water, regardless of male mating tactic. We report a novel tactic-specific difference in sperm linearity in which parr male sperm initially maintain straighter trajectories in river water, compared to dominant males, but then rapidly change to less linear and more circular paths over time. Intriguingly, we show that OF counteracts this change in sperm linearity in parr males so that patterns become indistinguishable from dominants when parr sperm swim in OF. Together, these results show that male chinook salmon exhibit differential sperm trait investment strategies depending on reproductive tactic.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-024-76115-4