Post-migration weight gain of Swainson's Hawks in Argentina Academic Article

abstract

• Swainson's Hawks (Buteo swainsoni; Aguilucho Langostero) were captured and banded in La Pampa, Argentina from 28 November 1996 through 25 January 1997. We collected morphometric measurements to determine if hawks gained weight on the austral (non-breeding) grounds. Hawks in apparently healthy condition weighed 819.7 11.1 g (mean SE, n = 127, range 540-1090 g). Weight increased significantly over the length of the non-breeding season in Argentina (P = 0.0059), but wingspan (124.9 0.5 cm, n = 127, range 105.7-137.1 cm) and tail (19.8 0.1 cm, n = 127, range 16.5-23.1 cm) did not. When separated by age, weight increased significantly for juveniles (P = 0.0083) but was marginally non-significant for adults (P = 0.0555).

authors

• Lacher, Thomas

published proceedings

• WILSON BULLETIN

author list (cited authors)

• Goldstein, M. I., Bloom, P. H., Sarasola, J. H., & Lacher, T. E.

complete list of authors

• Goldstein, MI||Bloom, PH||Sarasola, JH||Lacher, TE

publication date

• September 1999

published in

• WILSON BULLETIN  Journal

start page

• 428

end page

• 432

volume

• 111

issue

• 3