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Specimen Shrinkage in Tennessee Warblers and "Traill's" Flycatchers (Se Encojen Especímenes de Vermivora peregrina y Empidonax traillii)

Kevin Winker
Journal of Field Ornithology
Vol. 64, No. 3 (Summer, 1993), pp. 331-336
Published by: Wiley on behalf of Association of Field Ornithologists
Stable URL: http://www.jstor.org/stable/4513827
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Specimen Shrinkage in Tennessee Warblers and "Traill's" Flycatchers (Se Encojen Especímenes de Vermivora peregrina y Empidonax traillii)
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Abstract

Guidelines for morphometric sexing of monochromatic species are frequently based on museum specimens. These specimens tend to shrink when they dry, introducing a potential source of error that is typically ignored when sexing guidelines are applied to living birds. Shrinkage can amount to as much as 4% of the length of living body components, and investigators should correct their field data before applying museum-derived sexing criteria. Studies in the literature and data from Tennessee Warblers (Vermivora peregrina) and "Traill's" flycatchers (Empidonax "traillii") suggest that suitable correction factors will vary with taxon and body component. /// Las guías para el sexado morfométrico de especies monocromáticas se basan frecuentemente en especímenes de museo. Estos especímenes tienden a encogerse cuando se secan, introduciendo una fuente potencial de error que es típicamente ignorada cuando se aplican las guías de sexado a individuos vivos. Las pieles pueden encogerse hasta un 4% del largo de sus componentes en un organismo vivo por lo que los investigadores deben hacer las correcciones pertinentes en sus datos de campo antes de aplicar los mismos a los criterios de sexado con pieles de museos. Estudios en la literatura y datos tomados en especímenes frescos y luego de secarse de las especies Vermivora peregrina y Empidonax traillii sugieren que los factores de corrección pueden variar de un taxón a otro al igual que en los componentes corporales.

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