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Evaluation of methods for gender determination of Lesser Kestrel nestlings

AuthorsRodríguez, Carlos ; Bustamante, Javier ; Martínez-Cruz, Begoña; Negro, Juan J.
Issue Date2005
PublisherRaptor Research Foundation
CitationJournal of Raptor Research 39: 127- 133 (2005)
AbstractThe traditional method of determining gender of Lesser Kestrel (Falco naumanni) nestlings by visual assessment was tested for accuracy by using data from birds banded as nestlings and recaptured as adults. Concordance between gender assignment by different observers, and between visual and molecular gender determination was also evaluated. We tested whether color measurement of rumps and tails could improve gender determination. Based on recaptured kestrels, gender determination by eye had a 9.7% error, and was significantly greater for males than for females. Observers mostly relied on rump and tail color to assign gender to nestlings. Assessment of head, shoulders, tail, and rump patterns did not provide additional information that could improve gender determination in nestlings at the time of banding. Gender assignment based on color measurement on digital photos of rumps and tails did not improve determination by eye, but color measurement from a scanned rump feather approached 100% accuracy. We provide a discriminant function equation based on red, green, and blue brightness values (RCB) of a scanned rump feather and propose this as an efficient and effective method for gender determination in Lesser Kestrel nestlings. © 2005 The Raptor Research Foundation, Inc.
Identifiersissn: 0892-1016
Appears in Collections:(EBD) Artículos
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