JUVENILE AND ADULT SURVIVAL OF SWAINSON’S THRUSH (CATHARUS USTULATUS) IN COASTAL CALIFORNIA: ANNUAL ESTIMATES USING CAPTURE-RECAPTURE ANALYSES

Swainsons Thrush (Catharus ustulatus) Science Article 1

abstract

We estimated annual rates of survival for juvenile and adult Swainson’s Thrushes (Catharus ustulatus) using capture-recapture analyses from 22 years of mist-netting data in coastal California (n = 2,651 individual captures). Our apparent survival estimate was 56% for adults and 25% for juveniles. We are the first to estimate an annual juvenile survival rate for a Neotropical migrant using capture-recapture probability estimates. Like most estimates of annual survival, we could not distinguish between dispersal away from our study area (which is likely high for juveniles) and mortality.

Thomas Gardali et al., The Auk 120(4):1-30, 2003

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