Space use by Black-Necked Stilts Himantopus mexicanus in the San Francisco Bay Estuary

Ardea

Nicole D. Athearn²  Nils Warnock¹  Catherine Hickey¹  John Y. Takekawa² 

[1] 1 PRBO Conservation Science, 3820 Cypress Drive #11, Petaluma, CA 94954, USA;2 U.S. Geological Survey, Western Ecological Research Center, San Francisco Bay Estuary Field Station, 505 Azuar Drive, Vallejo, CA 94592, USA

关键词: Wetlands;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

WeexaminedspaceusebyBlack-neckedStiltsHimantopusmexicanusintheSanFranciscoBayestuary,USA,tobetterunderstandhowshorebirdsusetheirPacificFlywaylandscape.TheseeffortsareparticularlyimportantintheSanFranciscoBayestuarywhereongoinglarge-scalerestorationprojectsarerapidlychangingthemosaicofwetlandhabitats.Weradio-marked59stiltsandtrackedindividualsforuptofourmonthsandfoundnodifferenceinhomerangesizebysexorbetweenNorthandSouthBaysubrogions.Wedidfinddifferencesinhomerangesizebycapturesite.Meanhomerangewas283.5haandmovementfromcapturesiteswas4.5km.Weusedclusteranalysistocalculatenumberoffocalareasforindividualsandfoundthatoverallspacerequirementswerelargerforstiltswithmultiplecentresofactivity.Birdswithmultipleuseareaswereoftenthosethatbredinvegetatedmarshesandmovedintosaltpondswhentheirnestsfailedorafterchickshatched.IntheSouthBaysubregion,saltpondusewasgreaterthanavailabilityincoreusehomerangeareasdespitecomprisingthelargestproportionofavailablehabitat.Tidalsaltmarshrestorationfromformersaltpondsmayreduceavailablehabitatofinvertebratepreyspeciesthatdependonhypersalinehabitats;retentionofsomeshallow,mid-salinitymanagedpondsmaymitigatethisloss.Abetterunderstandingofthespaceuseandhabitatrequirementsofstiltswillprovideformorespecifichabitatandmanagementrecommendationsinareastargetedforwetlandrestoration,contributingtobetterconservationofshorebirdpopulationsalongthePacificFlyway.

【 授权许可】

Unknown