North American Birds

VOLUME 70 NO2 2018

A Quarterly Journal of Ornithological Record Published by the American Birding Association. The mission of the journal is to provide a complete overview of the changing panorama of our continent’s birdlife.

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Page 14 of 115

149 V O L U M E 7 0 ( 2 0 1 8 ) • N U M B E R 2 PRESUMED COLIMA x VIRGINIA'S WARBLER HYBRIDS IN TEXAS Colima Warblers were detected during this period. Whether or not Colima Warbler oc- curred more frequently at some point in the past is unknown. However, the considerable variation in plumage characteristics of inter- mediate birds suggests that there were mul- tiple generations of birds present providing evidence that back-crossing with individuals of both parental types was ongoing. Given the populations in the Davis Mountains, "pure" parental types that chose to breed in this range have a high probability of pairing with a hybrid individual. Another twenty-three birds of interest were captured in 2016 and 2017 at a band - ing station (at 6,300 ft. elevation) established on private property in upper Limpia Canyon adjacent to and just southeast of the Davis Mountains Preserve, providing additional in- hand data and confirmation that presumed hybrids persist to present; see Appendix A for morphometrics, assessment of plumage characteristics, and suggested identifications of these individuals. In examining these data, Spectrograms of Colima Warbler songs (13a) recorded 18 June 1999 (Cut 004-A4 by Kelly B. Bryan); and (13b) recorded 23 June 2001( Cut 014-B6 by Kelly B. Bryan) both recorded in Tobe Canyon, Davis Mountains Preserve, Jeff Davis County, Texas. 13a 13b Figure 12 • Adult male Colima Warbler in Boot Canyon, Big Bend National Park, Brewster County, Texas on 25 April 2015. This individual has strong brown tones on the back and flanks typical of this species. Photo by © Mark W. Lockwood.

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