Reproductive Interference Alters Species Coexistence in Nematodes due to Asymmetric Sperm-Induced Harm.

ABSTRACT: Species coexistence is shaped by a range of biotic and abiotic factors. Beyond predation, parasitism and competition, one species may interfere with another's reproduction to induce sexual exclusion from a habitat. Here, we test for reproductive interference from inter-species mating between sympatric nematodes Caenorhabditis macrosperma and C. nouraguensis. Higher intrinsic population growth of C. nouraguensis arises from greater reproductive output by both sexes, predicting it to be superior in resource competition. Mate discrimination between species is incomplete, however, with inter-species mating errors reducing lifespan and reproductive fitness of female C. nouraguensis only. These asymmetric costs arise within hours, due to ectopic migration of C. macrosperma's giant sperm cells. W

SUBMITTER: Schalkowski R 

PROVIDER: S-EPMC11791382 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature