Repeats, returns, and estimated flight ranges of neotropical migratory birds in Utah riparian habitat
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We present data on capture and recapture of neotropical migrants at constant-effort mist net sampling locations in Utah between 1994 and 2002. Data were collected in accordance with MAPS (Monitoring Avian Productivity and Survivorship) protocols. Since 1994, a total of 23,789 birds have been captured (i.e., total captures include new captures, recaptures, and unbanded individuals) representing 149 species. Data collected thus far provide some measure of site fidelity and longevity for species breeding in and migrating through Utah. Of the 18,358 birds banded, 2,367 (12.9 percent) were subsequently recaptured at least once. The longest interval between initial capture and recapture was over eight years. Assessments of subcutaneous fat carried by each bird captured were also made in accordance with MAPS protocols. Using Yellow Warbler (Dendroica petechia) as an example, we calculated an estimated maximum travel distance (EMTD) that migrants can fly from Utah on the energy derived from fat metabolism. Based on our calculations, juvenile Yellow Warblers could potentially outdistance adults and travel almost 1,000 km from Utah without refueling.