THE IMPORTANCE OF PRODUCTIVITY TO THE DYNAMICS OF A SWAINSON’S THRUSH POPULATION

Swainsons Thrush (Catharus ustulatus) Science Article 3

abstract

We analyzed the population dynamics of Swainson’s Thrushes (Catharus ustulutus) breeding at the Palomarin Field Station of the Point Reyes Bird Observatory using 15 yearsbreeding at the Palomarin Field Station of the Point Reyes Bird Observatory using 15 years (1980-1994) of long-term, standardized mist-net data. The capture rates of adults and hatching-year birds provided indices of adult abundance and productivity respectively. Annual variation of these indices was high, and linear regression analysis revealed no longterm trend.

MATTHEW D. JOHNSON AND GEOFFREY R. GEUPEL, The Condor 98:133-141

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