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dc.contributor.authorKobayashi, Kazuyaen
dc.contributor.alternative小林, 和也ja
dc.description性淘汰が生物多様性を維持することを解明 --身勝手な競争が集団サイズを安定化させる--. 京都大学プレスリリース. 2018-11-14.ja
dc.description.abstract1. Mechanisms for maintaining biodiversity are still mysterious despite the considerable amount of research. The classic theory predicts that stable co‐occurrence of competitive species requires niche differentiation. In fact, the co‐occurring species are often differentiated from each other. However, the neutral theory assuming equivalence of the reproductive rate of all individuals regardless of the species in a biological community has successfully recreated the observed patterns of species abundance distribution. This success is based on the unrealistic assumption suggesting that some mechanisms eliminate interspecific differences in the reproductive rates. 2. Here, I present sexual harassment as a candidate of the mechanisms by constructing analytical and simulation models. Sexual harassment includes the traits that increase mating success even at the expense of fecundity when the species is abundant. By contrast, when the species is at a relatively low density, this negative effect on fecundity is mitigated because less competition for mating occurs in the rare species. 3. The analytical model of this effect on fecundity predicted that sexual organisms stop population growth before exhausting resources due to the effect. This prediction was confirmed by simulation models. The simulations also showed that hundreds of competitive species with interspecific differences in reproductive potential can coexist over 10, 000 generations. Moreover, species abundance distributions obtained from the simulations were similar to the patterns observed in field data. Given the generality of sexual reproduction in nature, sexual harassment is likely to play a significant role in sustaining biodiversity over a broad range of environments. 4. Synthesis. Evolution does not always maximize population growth rate. This study shows that evolution of sexual harassment controls the population growth rate according to density and stabilizes the population size. This stabilizing effect has a potential to rescue endangered species from extinction, prevent overgrowth of common species, promote coexistence of competitive species, and successfully recreate the observed patterns of species abundance distribution.en
dc.rightsThis is the accepted version of the following article: Kobayashi, K. Sexual selection sustains biodiversity via producing negative density‐dependent population growth. J Ecol. 2019; 107: 1433– 1438, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.en
dc.rightsThe full-text file will be made open to the public on 15 April 2020 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.en
dc.rightsThis is not the published version. Please cite only the published version.en
dc.subjectDensity dependenceen
dc.subjecteco‐evolutionary dynamicsen
dc.subjectevolutionary ecologyen
dc.subjectgame theoryen
dc.subjectmating competitionen
dc.subjectneutral theoryen
dc.subjectpopulation dynamicsen
dc.subjectrank–abundance diagramen
dc.titleSexual selection sustains biodiversity via producing negative density‐dependent population growthen
dc.typejournal article-
dc.type.niitypeJournal Article-
dc.identifier.jtitleJournal of Ecologyen
dcterms.accessRightsopen access-
dcterms.alternativeSexual harassment sustains biodiversity via producing negative density-dependent population growthen
jpcoar.funderName.alternativeJapan Society for the Promotion of Science (JSPS)en
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