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Providing evidence to improve practice

Individual study: Marked population increase in pale-headed brush-finch Atlapetes pallidiceps in response to cowbird control

Published source details

Krabbe N., Juiña M. & Sornoza A.F. (2011) Marked population increase in pale-headed brush-finch Atlapetes pallidiceps in response to cowbird control. Journal of Ornithology, 152, 219-222


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Remove/control adult brood parasites Bird Conservation

A before-and-after trial in arid scrubland in the Yunguilla Valley, Ecuador (Krabbe et al. 2011), found a large increase in the number of territorial male pale-headed brush finches Atlapetes pallidiceps following the control of brown-headed cowbirds Molothrus ater, starting in 2003 (12-29 birds recorded in 1999-2002 vs. 27-50 in 2003-7). In addition, parasitism rates appeared lower, with only a single nest being parasitised in 2003 and none in 2005. Between 18 and 69 cowbirds were shot each year at the site.