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- W2891626667 abstract "Sexual selection continues after copulation via either sperm competition or cryptic female choice, and favors sperm traits that maximize sperm competitiveness. Both sperm swimming velocity and longevity are important determinants of the outcome of sperm competition. Theoretically, sperm morphology can influence sperm velocity at least in three different non-exclusive ways: (i) longer sperm may generate more propelling thrust, (ii) bigger midpieces may produce more energy, and/or (iii) larger flagella or mid-pieces relative to the head size may compensate for the drag forces around the head. A growing number of studies have investigated the relationship of sperm morphology with sperm performance, which remains equivocal at both the inter- and intra-specific levels. Here, we used House Sparrows to test the functional relationship between sperm morphology with sperm velocity and longevity. Based on a previous study showing that sperm swimming ability covaries with social rank, we predicted that -if a functional relationship exists-1) sperm morphology should differ across social ranks, and 2) correlations between sperm morphology and sperm velocity and/or sperm longevity should be constant across social ranks.We found no differences in sperm morphology across social ranks. Moreover, we found that sperm morphology may be correlated with sperm velocity, but such relationship varied across social ranks. This result contradicts the hypothesis of a functional relationship between sperm morphology and sperm performance. Finally, after experimentally manipulating social ranks, we observed that relationships between sperm morphology and sperm velocity and/or sperm longevity disappeared or changed direction.We suggest that in species with internal fertilization, while sperm morphology is likely constrained by the morphology of the female sperm storage organs, selection may act upon physiological traits that enhance sperm performance. Hence, these two selection forces could decouple sperm performance from sperm morphology." @default.
- W2891626667 created "2018-09-27" @default.
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- W2891626667 creator A5062324093 @default.
- W2891626667 creator A5090341600 @default.
- W2891626667 date "2018-09-19" @default.
- W2891626667 modified "2023-10-12" @default.
- W2891626667 title "Is sperm morphology functionally related to sperm swimming ability? A case study in a wild passerine bird with male hierarchies" @default.
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- W2891626667 doi "https://doi.org/10.1186/s12862-018-1260-8" @default.
- W2891626667 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6146611" @default.
- W2891626667 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30231935" @default.
- W2891626667 hasPublicationYear "2018" @default.
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