Winter Survivorship and Site Fidelity of Nelson's, Saltmarsh, and Seaside Sparrows in North Carolina

The condor

Virginia L. Winder¹ 

关键词: Ammodramus caudacutus;    Ammodramus maritimus;    Ammodramus nelsoni;    migration;    recapture;    site fidelity;    survival;   

DOI  :  10.1525/cond.2012.110088

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. Three species of coastal sparrows (Ammodramus nelsoni, Nelson's Sparrow; A. caudacutus, Saltmarsh Sparrow; and A. maritimus, Seaside Sparrow) reside in North Carolina salt marshes in winter during their nonbreeding periods. We analyzed the timing of migration, survivorship, and site fidelity of these species with mark—recapture data from five winters (2006–2010). By determining the percentage of individuals captured more than once, we documented a shift from transient to settled individuals during and following migration and used linear regressions to test whether this shift was related to mean monthly minimum temperatures. We also used MARK and capture histories over five winters to estimate probabilities of apparent survival and capture. On the basis of recapture data, the three species' populations were composed largely of transient individuals from October until the sparrows settled for the winter by late November. Our recapture data indicate that when coastal sparrows settle for the winter ...

【 授权许可】

CC BY