Portal de Periódicos da CAPES

Effects of habitat, season, and age on winter fat storage by migrant and resident birds in Jamaica

2019; Association of Field Ornithologists; Volume: 90; Issue: 2 Linguagem: Inglês

10.1111/jofo.12294

1557-9263

Bradley J. Bergstrom, Matthew D. Johnson, Jared C. Harris, Thomas W. Sherry,

Wildlife Ecology and Conservation

Journal of Field OrnithologyVolume 90, Issue 2 p. 162-175 Feature Article Effects of habitat, season, and age on winter fat storage by migrant and resident birds in Jamaica Bradley J. Bergstrom, Corresponding Author Bradley J. Bergstrom bergstrm@valdosta.edu orcid.org/0000-0003-4264-8115 Department of Biology, Valdosta State University, Valdosta, Georgia, 31698 USACorresponding author. Email: bergstrm@valdosta.eduSearch for more papers by this authorMatthew D. Johnson, Matthew D. Johnson Department of Wildlife, Humboldt State University, Arcata, California, 95521 USASearch for more papers by this authorJared C. Harris, Jared C. Harris Department of Biology, Valdosta State University, Valdosta, Georgia, 31698 USASearch for more papers by this authorThomas W. Sherry, Thomas W. Sherry Department of Ecology and Evolutionary Biology, 400 Boggs Hall, Tulane University, New Orleans, Louisiana, 70118 USASearch for more papers by this author Bradley J. Bergstrom, Corresponding Author Bradley J. Bergstrom bergstrm@valdosta.edu orcid.org/0000-0003-4264-8115 Department of Biology, Valdosta State University, Valdosta, Georgia, 31698 USACorresponding author. Email: bergstrm@valdosta.eduSearch for more papers by this authorMatthew D. Johnson, Matthew D. Johnson Department of Wildlife, Humboldt State University, Arcata, California, 95521 USASearch for more papers by this authorJared C. Harris, Jared C. Harris Department of Biology, Valdosta State University, Valdosta, Georgia, 31698 USASearch for more papers by this authorThomas W. Sherry, Thomas W. Sherry Department of Ecology and Evolutionary Biology, 400 Boggs Hall, Tulane University, New Orleans, Louisiana, 70118 USASearch for more papers by this author First published: 23 April 2019 https://doi.org/10.1111/jofo.12294Citations: 1Read 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 onFacebookTwitterLinkedInRedditWechat Abstracten Most small birds wintering in the tropics should show little subcutaneous fat deposition (SFD), except in habitats where food availability may decline in late winter or, for some resident species, to prepare for incubation or brooding fasts. However, these predictions need re-examination in light of a new, precise, cross-validated method to compare SFD among habitats and species. We sampled 170 Nearctic-Neotropical migrant and 279 resident birds during early and late winter in 1993 and 1994 in Jamaica, West Indies. Habitats, from greatest to least expected availability of insect prey, were (1) mangrove forest, (2) montane/foothills forest and cultivation, (3) dry limestone forest, and (4) acacia scrub. Percent lipid, estimated from multiple-regression models using visual fat scoring (0–8 scale), total-body electrical conductivity, and a variety of morphometrics, was categorized by percentile ranks to determine if SFD varied by habitat, season, or age for all species, resident species, migrant species, and several individual species. SFD averaged ~ 13% total mass for all birds, ranging from 8–24% for well-sampled species. The few bird species in acacia scrub, primarily two facultative long-distance migrants, averaged ~ 26% lipid content, significantly more than birds in other habitats. Most birds did not vary in SFD in the other three habitats, although Common Yellowthroats (Geothlypis trichas) had greater SFD in dry limestone habitat than in montane habitat. Bananaquits (Coereba flaveola) and Jamaican Euphonias (Euphonia jamaica) in montane habitat, especially in early winter, had higher SFD than other resident species. Contrary to our prediction, adults and juveniles had similar SFD, with the exception of juveniles having more SFD than adults in acacia scrub habitat. Winter fat deposition (or, in some cases, muscle-protein catabolism) in the tropics may be an overlooked strategy, potentially important as a hedge against fasting for floaters, facultative migrants, some territorial migrants in habitats with seasonal declines in food resources, and some resident species prior to breeding. Resumenes Efectos del hábitat, la estación y la edad en el almacenamiento de grasa en invierno por aves migratorias y residentes en Jamaica La mayoría de las aves pequeñas que pasan el invierno en los trópicos deben mostrar poca deposición de grasa subcutánea (SFD), excepto en los hábitats donde la disponibilidad de alimentos puede disminuir al fin del invierno, o para algunas especies residentes que prepararan para los ayunos durante la incubación. Sin embargo, estas predicciones requieren un nuevo examen a la luz de un método nuevo, preciso y con validación cruzada para comparar el SFD entre hábitats y especies. Tomamos muestras de 170 aves migratorias Neotropicales y 279 aves residentes durante el invierno temprano y tardío en 1993 y 1994 en Jamaica, Indias Occidentales. Los hábitats, de mayor a menor disponibilidad de presas de insectos, fueron (1) bosque de manglar, (2) bosque montano / laderas y campos de cultivo, (3) bosque seco de piedra caliza y (4) matorrales de acacia. El porcentaje de lípidos, estimado a partir de modelos de regresión múltiple que utilizan la puntuación visual de la grasa (escala 0-8), la conductividad eléctrica total del cuerpo y una variedad de morfometría, se clasificó por rangos percentiles para determinar si el SFD varió según el hábitat, la estación o la edad de todas las especies, especies residentes, especies migratorias y varias especies individuales. El SFD promedió fue ~ 13% de la masa total para todas las aves, con un rango de 8 a 24% para las especies bien muestreadas. Las pocas especies de aves en matorrales de acacia, principalmente dos migrantes facultativos de larga distancia, promediaron un contenido de lípidos de aproximadamente 26%, significativamente más que las aves en otros hábitats. La mayoría de las aves no variaron en SFD en los otros tres hábitats, aunque Mascaritas comunes (Geothlypis trichas) tuvieron mayor SFD en el hábitat seca de piedra caliza que en el hábitat montano. Las Reinita-mieleras (Coereba flaveola) y las Euphonia jamaica en hábitat montano, especialmente al principio del invierno, tuvieron mayor SFD que otras especies residentes. Contrariamente a nuestra predicción, los adultos y los juveniles tenían SFD similar, con la excepción de los juveniles que tienen más SFD que los adultos en el hábitat de matorral de acacia. La deposición de grasa en el invierno (o, en algunos casos, el catabolismo de proteínas musculares) en los trópicos puede ser una estrategia pasada por alto, potencialmente importante como una cobertura contra el ayuno para flotadores, migrantes facultativos, algunos migrantes territoriales en hábitats con disminuciones estacionales en los recursos alimenticios, y algunas especies residentes antes de la reproducción. Citing Literature Supporting Information Filename Description jofo12294-sup-0001-AppendixS1.xlsxMS Excel, 86.1 KB Appendix S1. Raw data spreadsheet for birds sampled in Jamaica 1993–1994. jofo12294-sup-0002-AppendixS2.pdfPDF document, 2.1 MB Appendix S2. Photographs of habitats and field sites, and TOBEC equipment. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. Volume90, Issue2June 2019Pages 162-175 RelatedInformation