Data from: Sperm longevity and salinity – the overlooked importance of spawning environment for alternative reproductive tactics
- 1. University of Borås
- 2. University of Gothenburg
Description
Studies on adaptive responses to sperm competition have focused on mating modes and mating roles. The main mating modes studied are external and internal fertilization and spermcasting. The focus of male mating roles assumes one advantageous 'bourgeois' role and another disadvantageous 'parasitic' role regarding the probability of fertilization. However, sperm longevity between teleost fishes spawning in hypoosmotic freshwater and species spawning in hyperosmotic saltwater differs markedly. We argue that this can have major impacts on sperm adaptations in relation to sperm competition, due to physiological constraints and different outcomes of trade-offs. To test this hypothesis, we extracted sperm longevity data from studies on species with alternative reproductive tactics. We show that spawning salinity affects sperm longevity by orders of magnitudes and that this affects the direction in which male tactics differ in sperm longevity: parasitic males' sperm lived shorter than bourgeois males' sperm in freshwater spawners, but longer than bourgeois males' sperm in saltwater spawners. These results highlight a need to take spawning salinity into account in intraspecific as well as interspecies comparisons of adaptations to sperm competition in external fertilizers.
Notes
Key of definitions of variable names, column headings and row labels:
Species: The species of the study and for Salmo salar study location
Salinity: The salinity in which sperm longevity was measured (same as male native salinity)
Temperature: The temperature in which sperm longevity was measured
ART_highest_longevity: which of the two alternative reprocuctive tactics which has significantly higher sperm longevity than the other. Sneaker = sneaker male and dominant = dominant male. NS = no significant difference
Longevity_sneaker_s: Sperm longevity of sneaker males
Longevity_dominant_s: Sperm longevity of dominant males
Longevity_sneak_log10: Sperm longevity of sneaker males log10 transformed
Longevity_dominant_log10: Sperm longevity of dominant males log10 transformed
Longevity_sneaker_s_Ss_pooled: Sperm longevity of sneaker males Salmo salar from same temeperature pooled (Salmo salar 1 and Salmo salar 2 as well as Salmo salar 3 and Salmo salar 4)
Longevity_dominant_s_Ss_pooled: Sperm longevity of dominant males Salmo salar from same temeperature pooled (Salmo salar 1 and Salmo salar 2 as well as Salmo salar 3 and Salmo salar 4)
Longevity_sneak_log10_Ss_pooled: Sperm longevity of sneaker males Salmo salar from same temeperature pooled (Salmo salar 1 and Salmo salar 2 as well as Salmo salar 3 and Salmo salar 4) log10 transformed
Longevity_dominant_log10_Ss_pooled: Sperm longevity of dominant males Salmo salar from same temeperature pooled (Salmo salar 1 and Salmo salar 2 as well as Salmo salar 3 and Salmo salar 4) log 10 tranformed
Reference: The study with the original data
Dominant: The sperm longevity was significantly higher for dominant bourgeois males than for sneaker parasitic males
Sneaker: The sperm longevity was significantly lower for dominant bourgeois males than for sneaker parasitic males
NS: No significant difference in sperm longevity between dominant bourgeois males and sneaker parasitic males
n/a: Not available. This is because Salmo salar tested in the same temperature intervall were pooled and that we also give the dta for all Salmo salar studies
Funding provided by: The Swedish research council*
Crossref Funder Registry ID:
Award Number: 2016-03343
Funding provided by: The Swedish Environmental Protection Agency and the Swedish Research Council Formas*
Crossref Funder Registry ID:
Award Number: 2020-00055
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