Sources of Variation in Enterococci and Enterobacteriaceae Loads in Nestlings of a Hole-Nesting Passerine

Ardea

Rafael Ruiz-de-Castañeda¹  Sonia González-Braojos¹  Ana I. Vela²  Víctor Briones²  Juan Moreno¹ 

[1] 1 Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales-CSIC, José Gutiérrez Abascal 2, 28006 Madrid, Spain;2 Centro de Vigilancia Sanitaria Veterinaria, Universidad Complutense de Madrid, Avda Puerta del Hierro s/n, 28040 Madrid, Spain 3 Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Avda Puerta del Hierro s/n, 28040 Madrid, Spain

关键词: Hatching Date;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

Gutbacterialloadsinaviannestlingsmaybeaffectedbyfactorssuchasclimate,seasonalityandbroodsize.Thereisnopublishedinformationonthissubjectforwildbirds,despiteitspotentialimportancefornestlingwelfareandgrowth.Westudiedtheassociationsofthesefactorswithabundancesoftwocommongutbacterialtypes,enterococciandEnterobacteriaceae,innestlingPiedFlycatchersFicedulahypoleucaincentralSpain.Tothatend,weobtainedfaecalsamplesfrom54broods(102nestlings)onday7and13afterhatching,fordetectionandestimationofbacterialabundance.Enterobacteriaceaeloadsonday7werepositivelycorrelatedwithmeantemperatureduringtheprecedingsevendaysandnegativelycorrelatedwithrainfallandhatchingdate.ThenegativeassociationsofEnterobacteriaceaeloadswithrainfallwereonlyfoundforearlybroods,atlowtemperatures.Enterococciloadsonday7werepositivelyassociatedwithmeantemperature.Onday13,Enterobacteriaceaeloadswerenegativelycorrelatedwithhatchingdate,whileenterococciloadswerepositivelycorrelatedwithmeantemperature.Enterobacteriaceaeareapparentlymoresensitivetoseasonalchangesandclimaticvariationthanenterococci,possiblyinrelationtovariationindietandnutrition.Bycontrast,enterococciareonlysensitivetothermalvariation.TheattainmentoffullthermoregulatorycapacitybynestlingsreducesclimaticeffectsonEnterobacteriaceaeloads.

【 授权许可】

Unknown