SimonThomasBlondelEtAl2004

Référence

Simon, A., Thomas, D.W., Blondel, J., Perret, P. and Lambrechts, M.M. (2004) Physiological ecology of mediterranean blue tits (Parus caeruleus L.): Effects of ectoparasites (Protocalliphora spp.) and food abundance on metabolic capacity of nestlings. Physiological and Biochemical Zoology, 77(3):492-501.

Résumé

The consequences of nest ectoparasites, such as Protocalliphora larvae, on nestling birds have been the subject of numerous studies. Despite observed reductions in mass and hematocrit of chicks from parasitized nests, no studies have found any effect of Protocalliphora on nestling survival, suggesting that fitness consequences of Protocalliphora are either weak or occur after fledging. From experiments on the metabolic performance of chicks, we found that parasitized chicks suffer from reduced thermogenic and metabolic capacities as a result of decreased mass and hematocrit. Hence, Protocalliphora may potentially affect nestling survival after fledging, when energetically costly activities such as flight and moult are undertaken. Previous studies have demonstrated an increase in parental feeding rate to compensate for the detrimental consequences of parasite infestation. We tested whether parasite effects on nestling aerobic capacity were dependent on food availability during the feeding period. Measures of caterpillar densities and experimental manipulations of parasite loads allowed us to investigate relationships among host, parasite, and environment. A positive relationship between chick aerobic and thermogenic performances and caterpillar density suggests that negative effects of parasitism may be offset by increased food availability. This study provides the first measurement of the effects of an ectoparasite on metabolic competence in wild birds and documentation of the effect of food availability on ectoparasite virulence using a quantitative measure of food abundance.

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@ARTICLE { SimonThomasBlondelEtAl2004,
    AUTHOR = { Simon, A. and Thomas, D.W. and Blondel, J. and Perret, P. and Lambrechts, M.M. },
    TITLE = { Physiological ecology of mediterranean blue tits (Parus caeruleus L.): Effects of ectoparasites (Protocalliphora spp.) and food abundance on metabolic capacity of nestlings },
    JOURNAL = { Physiological and Biochemical Zoology },
    YEAR = { 2004 },
    VOLUME = { 77 },
    PAGES = { 492-501 },
    NUMBER = { 3 },
    NOTE = { 15222152 (ISSN) Cited By (since 1996): 11 Export Date: 26 April 2007 Source: Scopus CODEN: PBZOF Language of Original Document: English Correspondence Address: Simon, A.; Grp. Rech. Ecologie, Nutr., E.; Ctr. de Rech. en Biol. Forestiere; Universite? de Sherbrooke Sherbrooke, Que. J1K 2R1, Canada; email: aurelie@hermes.usherb.ca References: Anderson, R.M., May, R.M., Regulation and stability of host-parasite population interactions. I. Regulatory processes (1978) J Anim Ecol, 47, pp. 219-247; Population biology of infectious diseases. 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    ABSTRACT = { The consequences of nest ectoparasites, such as Protocalliphora larvae, on nestling birds have been the subject of numerous studies. Despite observed reductions in mass and hematocrit of chicks from parasitized nests, no studies have found any effect of Protocalliphora on nestling survival, suggesting that fitness consequences of Protocalliphora are either weak or occur after fledging. From experiments on the metabolic performance of chicks, we found that parasitized chicks suffer from reduced thermogenic and metabolic capacities as a result of decreased mass and hematocrit. Hence, Protocalliphora may potentially affect nestling survival after fledging, when energetically costly activities such as flight and moult are undertaken. Previous studies have demonstrated an increase in parental feeding rate to compensate for the detrimental consequences of parasite infestation. We tested whether parasite effects on nestling aerobic capacity were dependent on food availability during the feeding period. Measures of caterpillar densities and experimental manipulations of parasite loads allowed us to investigate relationships among host, parasite, and environment. A positive relationship between chick aerobic and thermogenic performances and caterpillar density suggests that negative effects of parasitism may be offset by increased food availability. This study provides the first measurement of the effects of an ectoparasite on metabolic competence in wild birds and documentation of the effect of food availability on ectoparasite virulence using a quantitative measure of food abundance. },
    KEYWORDS = { Parus caeruleus Protocalliphora },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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