Experimental evidence for antagonistic effects of sperm competition in two sea urchin species
Kumpitsch, L.; Beckmann, L. M.; Hanson, S. E.; Paredes, E.; Gonzalez Fernandez, J.; Langer, L.; Lifjeld, J. T.; Leder, E. H.; Havenhand, J. N.
Show abstract
Sperm competition can occur when sperm from two or more males compete for fertilization of a batch of eggs. While it has been extensively studied in internal fertilizers, it remains poorly under-stood in external fertilizers. To investigate how sperm competition affects fertilization under sperm limitation, we conducted controlled experiments on two sea urchin species: Paracentrotus lividus and Dendraster excentricus. Eggs from a single female were exposed to sperm from three individ-ual males separately (non-competitive treatment) or to a pooled sample from three males (competi-tive treatment). We measured fertilization success as proportion of eggs fertilized after two hours and assessed sperm motility as percentage of motile sperm and curvilinear velocity. For P. lividus , we estimated the sperm concentrations where fertilization success was 50% of maximum observed fertilization success (F50), and the fertilization efficiency of the sperm (Fe), i.e. the likelihood that a sperm - egg encounter results in a fertilizing contact, using the fertilization kinetics model of Styan (1998). For D. excentricus, fertilization success was measured at a sperm concentration expected to produce 50% fertilization success. Sperm competition reduced fertilization success and increased F50 compared to non-competitive treatments, suggesting antagonistic effects that may compromise fertilization under sperm-limited conditions in external fertilizers.
Matching journals
The top 5 journals account for 50% of the predicted probability mass.
Similar papers in this journal
- Reproductive fluids enabling cryptic female choice of paternity do not induce concomitant gamete-mediated paternal effects in embryos of hybridizing salmonid fishes 94%
- Sperm competition favours intermediate sperm size in a hermaphrodite 92%
- Rare morph Lake Malawi mbuna cichlids benefit from reduced aggression from con- and hetero-specifics 91%
Similar papers in this journal
- The dynamics of spawning acts by a semelparous fish and its associated energetic expenses 92%
- Bimodal breeding phenology in the parsley frog Pelodytes punctatus as a bet-hedging strategy in an unpredictable environment despite strong priority effects 91%
- Evolution of sperm morphology in a crustacean genus with fertilization inside an open brood pouch. 90%
Similar papers in this journal
- Environmental stress maintains trioecy in nematode worms 91%
- Interspecific introgression reveals a role of male genital morphology during the evolution of reproductive isolation in Drosophila 90%
- A constellation of dysfunctional hybrid phenotypes enforces reproductive isolation between Caenorhabditis nematode species 90%
Similar papers in this journal
- Social clues in risky pools: Perceived conspecific rivals strongly modify individual oviposition decisions in response to larval predation and competition 92%
- Sexual selection on a female copulatory device in an insect with nuptial gifts 90%
- No reproductive benefits of dear enemy recognition in a territorial songbird 90%
"Similar papers" are the closest papers from that journal in the model's embedding space. They show what the match is built on, but the ranking comes mostly from a classifier over the whole training set, not from these examples alone.