Reproduction of the Middle Spotted Woodpecker Dendrocopos medius in the Nerussa-Desna Woodland, SW Russia, with Particular Reference to Habitat Fragmentation, Weather Conditions and Food Supply

Ardea

Serguei M. Kossenko¹  Evgeniya Yu. Kaygorodova¹ 

[1] 1 “Bryansky Les” State Nature Reserve, Nerussa Station, Suzemka District, Bryansk Region 242180, Russia

关键词: Food Supply;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

TheNerussa-Desnawoodland(south-westernRussia)isoneofthecoreareasfortheMiddleSpottedWoodpeckerDendrocoposmedius,ahabitatspecialistrestrictedmainlytomatureoakforests.Recentstudieshaveshownalowerbreedingdensityofthespeciesinfragmentedcomparedwithcontinuoushabitat.Toevaluatereproductionasapossiblemechanismunderlyingthefragmentationeffects,westudiedreproductiveperformanceofthespeciesinbothcontinuoushabitatandfragmentedhabitatintheforestedlandscapesoftheNerussa-Desnawoodland.During1997–2001,annualvariationofreproductiveindicesinbothcontinuousandfragmentedhabitatwasinsignificant.Noneoftheindiceswassignificantlylowerinfragmentedhabitatthoughnestlinglossesweresignificantlyhigherinfragments.Timingofbreedingin2000waslaterinfragmentedthancontinuoushabitat,probablyduetodifferentiallandscapephenology.Infragments,fledgingsuccessinayearwasinverselyrelatedtothemeanamountofrain.Onthebasisofindividualpairs,fledglingproductionalsocorrelatedsignificantlyandnegativelywiththeamountofrainduringthenestlingperiodinfood-poorfragmentsonly.In1999–2001,abundanceofLepidopteralarvae,mainfoodfortheMiddleSpottedWoodpeckerduringnestlingphase,variedsignificantlyincontinuoushabitat,whereasinfragmentedhabitatthepatternsofvariationdifferedbetweenfragments.Nosignificantcorrelationwasfoundbetweenlarvaldensityandreproductiveperformanceofindividualpairsineitherhabitat.Largeoakdensity,ahabitatfeaturerelatedtopotentialfoodabundance,washigherinfragmentsthanincontinuoushabitatbutwasnotrelatedtothereproductiveperformance.Thelowerlarvaldensitywithinsometerritoriesinfragmentsasopposedtocontinuoushabitatislikelytoexplainhighernestlingmortalityinfragmentedcomparedtocontinuoushabitat.Generally,wefoundlittleevidenceforloweredreproductiveperformanceinrelationtofragmentation.Therefore,thisseemsunlikelytoberesponsibleforthefragmentation-sensitivepatternsofdensity.

【 授权许可】

Unknown