INVESTIGADORES
SARASOLA jose Hernan
artículos
Título:
Post-migration weight gain of Swainsons hawk on the wintering grounds in Argentina
Autor/es:
GOLDSTEIN, M.I., P.H. BLOOM, J.H. SARASOLA AND T. E. LACHER
Revista:
WILSON BULLETIN
Referencias:
Año: 1999 vol. 111 p. 428 - 432
ISSN:
0043-5643
Resumen:
Swainsons 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 aunal (non-breeding) grounds. Hawks in appatently 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 2 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).