Associations between ovarian fluid and sperm swimming trajectories in marine and freshwater teleosts: a meta-analysis

Myers, Jaelen Nicole, Senior, Alistair, Zadmajid, Vahid, Sørensen, Sune Riis, and Butts, Ian Anthony Ernest (2020) Associations between ovarian fluid and sperm swimming trajectories in marine and freshwater teleosts: a meta-analysis. Reviews in Fisheries Science & Aquaculture, 28 (3). pp. 322-339.

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Marine and freshwater spawning environments present fish sperm with unique challenges, but for both, gametes often signal prior to contact via biochemical interactions through maternally-derived compounds (i.e. eggs and ovarian fluid; OF). For example, when OF is incorporated into the fertilization environment, sperm have been observed to exhibit changes in swimming trajectories (e.g. motility and velocity), yet it remains unclear whether the presence of this OF consistently improves sperm performance. The objectives of this study were to determine the overall effect of OF on sperm performance using meta-analysis. Published literature was searched for studies comparing sperm motility and/or velocity in the presence and absence of OF. For each study, the log response ratios (lnRR) was calculated, in which positive values indicate improved performance in the presence of OF. For motility, the overall effect size was non-significant (lnRR = 0.09, CL = −0.06, 0.24), whereas velocity was positively affected by OF (lnRR = 0.10; CL = 0.04, 0.17). When segregated by environment, for freshwater species there was a significant positive effect of the OF on velocity (lnRR = 0.18, CL = 0.07, 0.29), which translated to an increase in velocity of 20%. In contrast, no effect was detected for velocity in marine species (lnRR = −0.01, CL = −0.02, 0.01). Overall, there is evidence that OF improves sperm performance, although spawning environment and/or taxonomic factors are likely to moderate these sperm-OF interactions. Together, these results further our understanding of natural reproductive processes governing sperm performance, mating systems, and fertilization dynamics.

Item ID: 64597
Item Type: Article (Research - C1)
ISSN: 2330-8257
Keywords: fertilization dynamics; reproduction; cryptic female choice; gamete biology; sexual selection
Copyright Information: © 2020 Taylor & Francis Group, LLC
Funders: Alabama Agricultural Experimental Station, USDA National Institute of Food and Agriculture (NIFA), Australian Research Council (ARC)
Projects and Grants: NIFA Hatch project (1013854), ARC Discovery Early Career Researcher Award DE180101520
Date Deposited: 28 Oct 2020 04:24
FoR Codes: 31 BIOLOGICAL SCIENCES > 3101 Biochemistry and cell biology > 310199 Biochemistry and cell biology not elsewhere classified @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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