BaetaBelisleGarant2012a

Référence

Baeta, R., Belisle, M. and Garant, D. (2012) Importance of breeding season and maternal investment in studies of sex-ratio adjustment: A case study using tree swallows. Biology Letters, 8(3):401-404. (Scopus )

Résumé

The control of primary sex-ratio by vertebrates has become a major focus in biology in recent years. Evolutionary theory predicts that a differential effect of maternal characteristics on the fitness of sons and daughters is an important route, whereby selection is expected to favour a bias towards the production of one sex. However, despite experimental evidence for adaptive brood sex-ratio manipulation, support for this prediction remains a major challenge in vertebrates where inconsistencies between correlative studies are frequently reported. Here, we used a large dataset (2215 nestlings over 3 years) from a wild population of tree swallows (Tachycineta bicolor) and show that variations in breeding conditions affect female sex allocation in this species. Our results also suggest that such variation in sex allocation, owing to breeding season heterogeneity, modifies the relationships between maternal characteristics and maternal investment. Indeed, we detect a positive effect of maternal age on brood sex-ratio when age also affects offspring condition (in a low-quality breeding season). Our results indicate that including measures of both breeding season quality and maternal investment will help to better understand sex allocation patterns. © 2011 The Royal Society.

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@ARTICLE { BaetaBelisleGarant2012a,
    AUTHOR = { Baeta, R. and Belisle, M. and Garant, D. },
    TITLE = { Importance of breeding season and maternal investment in studies of sex-ratio adjustment: A case study using tree swallows },
    JOURNAL = { Biology Letters },
    YEAR = { 2012 },
    VOLUME = { 8 },
    PAGES = { 401-404 },
    NUMBER = { 3 },
    ABSTRACT = { The control of primary sex-ratio by vertebrates has become a major focus in biology in recent years. Evolutionary theory predicts that a differential effect of maternal characteristics on the fitness of sons and daughters is an important route, whereby selection is expected to favour a bias towards the production of one sex. However, despite experimental evidence for adaptive brood sex-ratio manipulation, support for this prediction remains a major challenge in vertebrates where inconsistencies between correlative studies are frequently reported. Here, we used a large dataset (2215 nestlings over 3 years) from a wild population of tree swallows (Tachycineta bicolor) and show that variations in breeding conditions affect female sex allocation in this species. Our results also suggest that such variation in sex allocation, owing to breeding season heterogeneity, modifies the relationships between maternal characteristics and maternal investment. Indeed, we detect a positive effect of maternal age on brood sex-ratio when age also affects offspring condition (in a low-quality breeding season). Our results indicate that including measures of both breeding season quality and maternal investment will help to better understand sex allocation patterns. © 2011 The Royal Society. },
    COMMENT = { Cited By (since 1996): 2 Export Date: 20 February 2013 Source: Scopus doi: 10.1098/rsbl.2011.1009 },
    ISSN = { 17449561 (ISSN) },
    KEYWORDS = { Birds, Breeding season heterogeneity, Sex allocation, Sex-ratio, Tree swallow, breeding season, data set, fitness, heterogeneity, parental investment, reproductive behavior, sex allocation, sex ratio, adaptation, aging, animal, article, body composition, Canada, female, male, physiology, reproduction, season, sex ratio, songbird, Adaptation, Physiological, Aging, Animals, Body Composition, Female, Male, Quebec, Reproduction, Seasons, Sex Ratio, Songbirds, Aves, Tachycineta, Tachycineta bicolor, Vertebrata },
    OWNER = { Luc },
    TIMESTAMP = { 2013.02.20 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-84860505979&partnerID=40&md5=5d900d58c7c9a68e9095435a7998bfcb },
}

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