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Phenology and sequence of the complete prealternate molt of Bobolinks in South America

2011; Association of Field Ornithologists; Volume: 82; Issue: 1 Linguagem: Inglês

10.1111/j.1557-9263.2010.00312.x

1557-9263

Rosalind B. Renfrew, Sarah J. K. Frey, Juan Klavins,

Wildlife Ecology and Conservation

Journal of Field OrnithologyVolume 82, Issue 1 p. 101-113 Phenology and sequence of the complete prealternate molt of Bobolinks in South America El ritmo y secuencia de la muda prealterna completa de Dolichonyx oryzivorus en Sudamérica Rosalind B. Renfrew, Corresponding Author Rosalind B. Renfrew Vermont Center for Ecostudies, P.O. Box 420, Norwich, Vermont 05055, USA Current address: Department of Forest Ecosystems and Society, 321 Richardson Hall, Oregon State University, Corvallis, OR 97331, USA Current address: Relinchos, Calle publica sin numero, (5182) Cruz Grande, Cordoba Prov., Argentina Corresponding author. Email: rrenfrew@vtecostudies.orgSearch for more papers by this authorSarah J. K. Frey, Corresponding Author Sarah J. K. Frey Vermont Center for Ecostudies, P.O. Box 420, Norwich, Vermont 05055, USA Current address: Department of Forest Ecosystems and Society, 321 Richardson Hall, Oregon State University, Corvallis, OR 97331, USA Current address: Relinchos, Calle publica sin numero, (5182) Cruz Grande, Cordoba Prov., Argentina Corresponding author. Email: rrenfrew@vtecostudies.orgSearch for more papers by this authorJuan Klavins, Corresponding Author Juan Klavins Vermont Center for Ecostudies, P.O. Box 420, Norwich, Vermont 05055, USA Current address: Department of Forest Ecosystems and Society, 321 Richardson Hall, Oregon State University, Corvallis, OR 97331, USA Current address: Relinchos, Calle publica sin numero, (5182) Cruz Grande, Cordoba Prov., Argentina Corresponding author. Email: rrenfrew@vtecostudies.orgSearch for more papers by this author Rosalind B. Renfrew, Corresponding Author Rosalind B. Renfrew Vermont Center for Ecostudies, P.O. Box 420, Norwich, Vermont 05055, USA Current address: Department of Forest Ecosystems and Society, 321 Richardson Hall, Oregon State University, Corvallis, OR 97331, USA Current address: Relinchos, Calle publica sin numero, (5182) Cruz Grande, Cordoba Prov., Argentina Corresponding author. Email: rrenfrew@vtecostudies.orgSearch for more papers by this authorSarah J. K. Frey, Corresponding Author Sarah J. K. Frey Vermont Center for Ecostudies, P.O. Box 420, Norwich, Vermont 05055, USA Current address: Department of Forest Ecosystems and Society, 321 Richardson Hall, Oregon State University, Corvallis, OR 97331, USA Current address: Relinchos, Calle publica sin numero, (5182) Cruz Grande, Cordoba Prov., Argentina Corresponding author. Email: rrenfrew@vtecostudies.orgSearch for more papers by this authorJuan Klavins, Corresponding Author Juan Klavins Vermont Center for Ecostudies, P.O. Box 420, Norwich, Vermont 05055, USA Current address: Department of Forest Ecosystems and Society, 321 Richardson Hall, Oregon State University, Corvallis, OR 97331, USA Current address: Relinchos, Calle publica sin numero, (5182) Cruz Grande, Cordoba Prov., Argentina Corresponding author. Email: rrenfrew@vtecostudies.orgSearch for more papers by this author First published: 23 February 2011 https://doi.org/10.1111/j.1557-9263.2010.00312.xCitations: 8Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstracten ABSTRACT Molt phenology plays an important role in the annual cycles and energetic budgets of migratory birds. The timing and sequence of molt of Nearctic-Neotropical migratory passerines is generally known for species that undergo a complete prebasic molt on or near the breeding grounds. However, for the few passerine species such as Bobolinks (Dolichonyx oryzivorus) that undergo a complete prealternate molt, the phenology of this molt on the wintering grounds has received little attention. Most studies evaluate prebasic molt, often carried out in conjunction with a different set of competing energetic demands and under dramatically different conditions (e.g., climate and food availability). The prebasic molt of Bobolinks has been described based on limited museum collections, but the sequence and phenology of the prealternate molt have not been examined. We collected molt data from 242 Bobolinks captured from January to March in Bolivia (2005–2007) and Argentina (2008). We quantified prealternate molt sequence and used a maximum likelihood approach to estimate molt initiation date and duration. We used AIC model selection to evaluate the potential effects of region, year, and sex on prealternate molt phenology. Onset and duration of molt did not differ among years or between males and females. Estimated molt duration was 13 d longer at Bolivia sites than at sites 1200 km further southeast in Argentina, but molt duration in Argentina varied and the difference was not statistically significant. Molt sequence was consistent among populations, and showed only slight deviations from what has been previously reported for Bobolinks. Our results suggest that regional wintering populations of Bobolinks do not mix in a given year, and local factors such as climate and food availability may influence molt phenology. RESUMENes El ritmo de la muda juega un rol importante en los ciclos anuales y en el reparto energético de las aves migratorias. El ritmo y secuencia de la muda de aves migratorias Nearcticas-Neotropicales del orden Passeriformes es generalmente conocido para especies que tienen una muda prebásica completa en o cerca de su distribución reproductiva. Sin embargo, para las pocas especies de passeriformes como Dolichonyx oryzivorus que tienen una muda prealterna completa, el ritmo de esta muda en su distribución no-reproductiva ha recibido poca atención. La mayoría de los estudios evalúan la muda prebásica, cual es a menudo realizado simultáneamente con un grupo de gastos energéticos diferentes, y bajo condiciones dramáticamente diferentes (ej., clima y disponibilidad de comida). La muda prebásica de D. oryzivorus ha sido descrita en base de una limitada serie de colecciones de mueso, pero la secuencia y el ritmo de la muda prealterna no han sido examinadas. Colectamos datos de muda de 242 D. oryzivorus capturados desde Enero hasta Marzo en Bolivia (2005–2007) y Argentina (2008). Cuantificamos la secuencia de la muda prealterna y usamos un método de máxima verosimilitud para estimar la fecha de la iniciación de la muda y su duración. Usamos el Criterio de Información de Akaike para seleccionar modelos y evaluar los efectos potenciales de la región, año y sexo sobre el ritmo de la muda prealterna. El inicio y la duración de la muda no varió entre años o entre machos y hembras. La duración estimada de la muda fue 13 días mas largo en sitios en Bolivia que en sitios 1200 km al sudeste en Argentina, pero la duración de la muda en Argentina varió y la diferencia no fue estadísticamente significante. La secuencia de la muda fue consistente entre poblaciones y demostró solo una leve variación de lo que se ha reportado previamente para D. oryzivorus. Nuestros resultados sugieren que las poblaciones regionales de D. oryzivorus de la época no-reproductiva no se mezclan en un año dado, y que factores locales como el clima y la disponibilidad de comida podrían influenciar el ritmo de la muda. Citing Literature Volume82, Issue1March 2011Pages 101-113 RelatedInformation