Habitat Edges Have Weak Effects on Duck Nest Survival at Local Spatial Scales
[摘要] Edgeeffectsonnestingsuccesshavebeendocumentedinbreedingbirdsinavarietyofcontexts,butthereisstilluncertaintyinhowedgetypeandspatialscaledeterminethemagnitudeanddetectabilityofedgeeffects.Habitatedgesareoftenviewedaspredatorcorridorsthatsurroundorpenetratecorehabitatandincreasetheriskofpredationfornearbynests.Westudiedtheeffectsofthreedifferenttypesofpotentialpredatorcorridors(mainperimeterroads,fieldboundaries,andATVtrailswithinfields)onwaterfowlnestsurvivalinCalifornia.Wemeasuredthedistancefromduckneststothenearestedgeofeachtype,anduseddistanceasacovariateinalogisticexposureanalysisofnestsurvival.Wefoundonlyweakevidenceforedgeeffectsduetopredation.Thebestsupportedmodelofnestsurvivalincludedallthreedistancecategories,andwhileallcoefficientestimateswerepositive(indicatingthatsurvivalincreasedwithdistancefromedge),85%coefficientconfidenceintervalsapproachedorboundedzeroindicatinganoverallweakeffectofhabitatedgesonnestsuccess.Wesuggestthatgiventheconfigurationofedgesatoursite,theremaybefewareasfarenoughfromhardedgestobeconsidered‘core’habitat,makingedgeeffectsonnestsurvivalparticularlydifficulttodetect.
[发布日期] [发布机构]
[效力级别] [学科分类] 动物科学
[关键词] Waterfowl [时效性]
