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Feather Molt by Swainson's Hawks ( Buteo Swainsoni ) on the Austral Grounds of Argentina
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bechard, Marc Joseph Weidensaul, C. Scott |
| Copyright Year | 2005 |
| Abstract | Feather molt in birds that undertake shortdistance migrations typically begins during the breeding season and reaches completion prior to the time of departure for migration (Stresemann & Stresemann 1966). For many species of birds that undertake long-distance migrations such as Arctic Peregrine Falcons (Falco peregrinus) and shorebirds, there is insufficient time to finish molting during the breeding season so feather molt is interrupted during the migration period, and it resumes on the wintering grounds where it can last for several more months (Welty & Baptista 1988, Gill 1999). Like Arctic species, the Swainson’s Hawk (Buteo swainsoni) is highly migratory and nearly the entire North American population migrates during the boreal winter to areas in southern South America, a round trip that exceeds 20,000 km (England et al. 1997, Fuller ______________ Corresponding author E-mail: mbechard@boisestate. edu et al. 1998). On their North American breeding grounds for as few as five months, Swainson’s Hawks can begin their annual molt but there is insufficient time to complete the molt process prior to departing on migration. In their descriptions of the timing of molt in the Swainson’s Hawk, Palmer (1988) and England et al. (1997) have assumed that, like other long-distance migrants, Swainson’s Hawks suspend their molt while on migration, and then resume the process of feather replacement for several months in Argentina during the austral summer. However, there have never been any details published documenting molt in Argentina, and which feathers are actually replaced to corroborate this assumption. With this in mind, we undertook this study to document the occurrence of feather molt in Swainson’s Hawks in Argentina, and to describe those remiges that are replaced prior its return to the North American breeding grounds. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://sora.unm.edu/sites/default/files/journals/on/v016n02/p0267-p0270.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
