Sex ratio effects on reproductive success of male and female Daphnia
| Autor: | Andrey V. Tchabovsky, Christoph R. Haag, Yan R. Galimov, Andrey R. Tukhbatullin |
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| Přispěvatelé: | Koltzov Institute of Developmental Biology, the Russian Academy of Sciences [Moscow, Russia] (RAS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Male
0106 biological sciences media_common.quotation_subject Parthenogenesis Zoology Biology 010603 evolutionary biology 01 natural sciences Daphnia Competition (biology) Sexual Behavior Animal 03 medical and health sciences 5. Gender equality Animals Sex Ratio Operational sex ratio Mating 10. No inequality Ecology Evolution Behavior and Systematics ComputingMilieux_MISCELLANEOUS 030304 developmental biology media_common 0303 health sciences [SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE] Reproductive success Reproduction biology.organism_classification Sexual reproduction Sexual selection Female Sex ratio |
| Zdroj: | Journal of Evolutionary Biology Journal of Evolutionary Biology, Wiley, 2021, 34 (11), pp.1817-1826. ⟨10.1111/jeb.13942⟩ |
| ISSN: | 1010-061X 1420-9101 |
| Popis: | The intensity of mating competition and the opportunity for sexual selection are thought to depend on the operational sex ratio, the ratio of sexually active males to fertilizable females. Cyclic parthenogens, organisms that alternate between sexual reproduction and female-only parthenogenesis, show particularly high variation in sex ratios in natural populations but the effects of this variation on mating competition and reproductive success of each sex are poorly understood. In a series of experiments with Daphnia magna, we experimentally imposed five sex ratio categories, varying from one male per 81 females to an even sex ratio. We found that, in males, reproductive success strongly and monotonically decreased with decreasing number of females per male. In females, in contrast, mating success and reproductive success were reduced only at the most female-biased sex ratio (1:81), when many females remained unmated and unfertilized, and then again at equal sex ratios, probably due to negative effects of high density or stress induced by numerous males. Our results suggest that females experienced male limitation at heavily female-biased sex ratios below one male to about 50 females. As this is well within the sex ratio variation observed in natural Daphnia populations, we conclude that mating competition and the opportunity for sexual selection may exist not only in males but, at least periodically, also in females. |
| Databáze: | OpenAIRE |
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