CONTINUED RANGE EXPANSION BY BRONZED COWBIRDS IN THE SOUTHWESTERN UNITED STATES

Richard M. Kostecke; Kevin Ellison; Scott G. Summers

doi:10.1894/0038-4909(2004)049<0487:CREBBC>2.0.CO;2

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Richard M. Kostecke,^1,2 Kevin Ellison,³ Scott G. Summers¹

¹The Nature Conservancy of Texas, P.O. Box 5190, Fort Hood, TX 76544-0190
²Correspondent: rkostecke@tnc.org
³Department of Zoology, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada

Abstract

The brood-parasitic bronzed cowbird (Molothrus aeneus,) continues to expand its range in New Mexico and Texas. The current breeding range is 280 km outside of the historic breeding range. In Texas, spread rate increased from 6.22 km per year prior to 1956 to 13.75 km per year after 1956. Spread rate in New Mexico was constant at 12.72 km per year. Flight-range estimates based on fat indices of spring migrant cowbirds trapped at their northern range boundary in Texas suggest the potential for migration 341 km further north. We discuss factors that might limit or promote further range expansion.

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Richard M. Kostecke, Kevin Ellison, and Scott G. Summers "CONTINUED RANGE EXPANSION BY BRONZED COWBIRDS IN THE SOUTHWESTERN UNITED STATES," The Southwestern Naturalist 49(4), 487-492, (1 December 2004). https://doi.org/10.1894/0038-4909(2004)049<0487:CREBBC>2.0.CO;2

Accepted: 16 February 2004; Published: 1 December 2004

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