ThomasShipleyBlondelEtAl2007

Référence

Thomas, D.W., Shipley, B., Blondel, J., Perret, P., Simon, A. and Lambrechts, M.M. (2007) Common paths link food abundance and ectoparasite loads to physiological performance and recruitment in nestling blue tits. Functional Ecology, 21(5):947-955. (Scopus )

Résumé

1. Identifying how selection shapes life-history traits by causally relating environment to phenotype, performance and fitness has often proven elusive due to limitations of classical analysis methods, which only identify covariance in traits, and to the difficulties in experimentally manipulating environment to expose cause and effect in wild populations. 2. In an approach resembling the experimental method common to all modern research, structural equation modelling can not only identify covariance in traits, but also test hypotheses of direct and indirect causal paths that tie environment to phenotypes and fitness through natural selection. Here, we use novel confirmatory path analyses and a long-term study of Corsican blue tits to analyse the interactions between environmental variables (prey abundance and ectoparasite load), phenotypic traits (mass and haematocrit), physiological performance (aerobic capacity) and nestling recruitment. 3. Our analyses show that an antagonistic interaction between ectoparasites and food abundance sets tissue development and oxygen carrying capacity of blood at fledging, and that identical paths link these variables to physiological performance and recruitment. 4. This study suggests that metabolic capacity at fledging may be important in determining subsequent recruitment and unmasks subtle fitness costs of an ectoparasite. © 2007 The Authors.

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@ARTICLE { ThomasShipleyBlondelEtAl2007,
    AUTHOR = { Thomas, D.W. and Shipley, B. and Blondel, J. and Perret, P. and Simon, A. and Lambrechts, M.M. },
    TITLE = { Common paths link food abundance and ectoparasite loads to physiological performance and recruitment in nestling blue tits },
    JOURNAL = { Functional Ecology },
    YEAR = { 2007 },
    VOLUME = { 21 },
    PAGES = { 947-955 },
    NUMBER = { 5 },
    ABSTRACT = { 1. Identifying how selection shapes life-history traits by causally relating environment to phenotype, performance and fitness has often proven elusive due to limitations of classical analysis methods, which only identify covariance in traits, and to the difficulties in experimentally manipulating environment to expose cause and effect in wild populations. 2. In an approach resembling the experimental method common to all modern research, structural equation modelling can not only identify covariance in traits, but also test hypotheses of direct and indirect causal paths that tie environment to phenotypes and fitness through natural selection. Here, we use novel confirmatory path analyses and a long-term study of Corsican blue tits to analyse the interactions between environmental variables (prey abundance and ectoparasite load), phenotypic traits (mass and haematocrit), physiological performance (aerobic capacity) and nestling recruitment. 3. Our analyses show that an antagonistic interaction between ectoparasites and food abundance sets tissue development and oxygen carrying capacity of blood at fledging, and that identical paths link these variables to physiological performance and recruitment. 4. This study suggests that metabolic capacity at fledging may be important in determining subsequent recruitment and unmasks subtle fitness costs of an ectoparasite. © 2007 The Authors. },
    ADDRESS = { Centre d'E?cologie Fonctionnelle et E?volutive, CNRS, 1919 Route de Mende, 34293 Montpellier Cedex 5, France },
    COMMENT = { Export Date: 21 September 2007 Source: Scopus CODEN: FECOE doi: 10.1111/j.1365-2435.2007.01301.x Language of Original Document: English Correspondence Address: Thomas, D.W.; De?partement de Biologie; Universite? de Sherbrooke Sherbrooke, Que. J1 K 2R1, Canada; email: Donald.Thomas@USherbrooke.ca },
    ISSN = { 02698463 (ISSN) },
    KEYWORDS = { Blue tits, Ectoparasites, Food abundance, Metabolic capacity, Parasite load },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
    URL = { http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-34548382233&partnerID=40&rel=R6.5.0 },
}

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