Food supplementation by an invasive fleshy-fruited shrub sustains body condition of a native frugivorous bird during winter  

作　　者：Tobias Nicolas ROJAS David Lautaro VERGARA-TABARES Diego Javier VALDEZ Marina Flavia PONZIO Susana Inés PELUC 

机构地区：[1]Institute of Diversity and Animal Eology(IDEA-CONICET),National University of Córdoba,Córdoba,Argentina [2]Institute of Health Science Research(INICSA-CONICET),Faculty of Medical Sciences,National University of Córdoba,Córdoba,Argentina [3]Faculty of Exacts,Physics and Nature Sciences,National University of Córdoba,Córdoba,Argentina [4]Instituto de Ecología Regional(IER-CONICET),National University of Tucumán,Tucumán,Argentina.

出　　处：《Integrative Zoology》2019年第3期259-269,共11页整合动物学（英文版）

基　　金：the“Secretaría de Ambiente de la Provincia de Córdoba”(authorization number:430625-053-913);the institution responsible for the regula­tion and control of the use of wild animals in scientific activities;Ruf­ford Foundation under a Rufford Small Grants(Num­ber 13090-1 to DLVT);the Association of Field Or­nithologists under a Bergstrom Award to DLVT.

摘　　要：Birds tend to adjust their behavior and physiology to changes in food availability in their environment.Season­al fluctuation of food resources may act as an energetic challenge,augmenting hypothalamus-pituitary-adre­nal axis(HPA axis)activity,leading to an increase in corticosterone concentrations and promoting the metab­olism of energy stores.Plant invasions may alter seasonal food fluctuations by providing a food supply during scarce seasons.This could attenuate the energetic challenge,reducing HPA axis activity and the metabolism of reserves.Using a system with seasonal fluctuation in food availability,we tested if fruit supplementation by the invasive fleshy-fruited Pyracantha angustifolia during the season of native fruit scarcity decreases the con­sumption of energy stores through activity attenuation of the HPA axis.We measured changes in body condition and circulating corticosterone(CORT)concentration in Turdus chiguanco occurring at sites both invaded and not invaded by P.angustifolia over 3 time periods that correspond to the periods prior to,during and after high­est fruit production of the plant.Fruit scarcity in the ecosystem appears as an energetic challenge for T.chiguan­co,given that body mass,fat score and residuals of body mass/tarsus length decreased during winter in a site not invaded by the exotic shrub.Conversely,the presence of the invasive plant seemed to attenuate the metab­olism of energetic reserves,as we did not record changes in body condition in birds inhabiting the invaded site.Unexpectedly,plasma CORT concentration did not vary between sites or periods.Further evaluation is required to elucidate how enhanced body condition,resulting from the consumption of a fleshy-fruited invasive plant,af­fects survivorship and reproductive performance in T.chiguanco.

关 键 词：biological invasion energetic reserves food fluctuation FRUGIVORY plasma corticosterone 

分 类 号：O57[理学—粒子物理与原子核物理]