Sherbrooke mature sex

Added: Keitha Dubreuil - Date: 26.02.2022 02:20 - Views: 34676 - Clicks: 6218

Sexual selection has a critical role in evolution, and it is fundamental to identify what ecological factors drive its variation. Disentangling the ecological correlates of sexual selection over the long term, however, is challenging and has rarely been done in nature.

We sought to assess how demographic changes influenced the intensity, direction and form of sexual selection and whether selective pressures varied with age. We tested whether breeder sex ratio, of competitors and age structure influenced selection differentials on horn length of wild bighorn rams Ovis canadensis of different age classes on Ram Mountain, Alberta.

We used 21 years of data including a detailed pedigree, demographic parameters and repeated morphological measurements. Sexual selection on horn length of males of all ages was directional and positive. Selection intensity increased with the of competitors, reflecting male-male encounter rate during the rut, but was independent of breeder sex ratio or age structure.

This result can also be linked to changes in population size because the of competitors was highly correlated to total of sheep. This demographic effect likely arises from age-dependent mating tactics. Males aged years are weakly competitive and experienced stronger sexual selection as they ed for a greater proportion of all males. Selection experienced by mature males appeared independent of demography. Our study provides a rare description of the demographic determinants of sexual selection in nature. Keywords: drivers of selection; linear selection; selection analysis; sexual selection; sexually selected characters; target of selection.

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Abstract Sexual selection has a critical role in evolution, and it is fundamental to identify what ecological factors drive its variation. Similar articles Comparing measures of breeding inequality and opportunity for selection with sexual selection on a quantitative character in bighorn rams. Martin AM, et al. J Evol Biol. Epub Dec PMID: Sexually antagonistic association between paternal phenotype and offspring viability reinforces total selection on a sexually selected trait. Biol Lett. Print Feb. Whole-genome resequencing uncovers molecular atures of natural and sexual selection in wild bighorn sheep.

Kardos M, et al. Mol Ecol. Epub Nov 6. Male sex drive and the maintenance of sex: evidence from Drosophila. Singh RS, et al. J Hered. Epub Mar 8. PMID: Review. Sexual selection in males and females. Clutton-Brock T. See all similar articles. Coleoptera: Coccinellidae. Wang YL, et al. Determinants and long-term costs of early reproduction in males of a long-lived polygynous mammal.

Ritchot Y, et al. Ecol Evol. Marine protected areas rescue a sexually selected trait in European lobster. Evol Appl. Zheng XL, et al. J Insect Sci. The genetic legacy of 50 years of desert bighorn sheep translocations. Jahner JP, et al. See all "Cited by" articles. Alberta Actions. Animals Actions. Horns Actions. Male Actions. Reproduction Actions. Selection, Genetic Actions.

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Sherbrooke mature sex

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Demographic drivers of age-dependent sexual selection