Annual survival of an endangered passerine, The florida grasshopper sparrow

摘要

We sought to determine annual survivorship for adult male and juvenile Florida Grasshopper Sparrows (Ammodramus savannarum floridanus), a federally endanagered taxon whose range is limited to central Florida. We captured, banded, and resighted 161 birds at two study sites, Avon Park Air Force Range and Three Lakes Wildlife Management Area, from 1995-1998. For the period 1995-1998, we estimated mean adult annual Male survivorship with program JOLLY to be 48.2/100 and 53.5/100 at these tow sites. Because sample size of Banded juveniles was small, we were unable to use the JOLLY program for this age group.