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Experimental fruit removal does not affect territory structure of wintering Hermit Thrushes

2006; Association of Field Ornithologists; Volume: 77; Issue: 4 Linguagem: Inglês

10.1111/j.1557-9263.2006.00071.x

1557-9263

David R. Brown, Jennifer A. Long,

Forest Insect Ecology and Management

Journal of Field OrnithologyVolume 77, Issue 4 p. 404-408 Experimental fruit removal does not affect territory structure of wintering Hermit Thrushes Remoción experimental de frutas, no afecta la estructura territorial de individuos invernales deCatharus guttatus David R. Brown, Corresponding Author David R. Brown Department of Biological Sciences, Southeastern Louisiana University, Hammond, Louisiana 70402 USA Corresponding author. Current address: Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, USA. Email: [email protected] Current address: Department of Biology, 5751 Murray Hall, University of Maine, Orono, Maine 04469, USA.Search for more papers by this authorJennifer A. Long, Corresponding Author Jennifer A. Long Department of Biological Sciences, Southeastern Louisiana University, Hammond, Louisiana 70402 USA Corresponding author. Current address: Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, USA. Email: [email protected] Current address: Department of Biology, 5751 Murray Hall, University of Maine, Orono, Maine 04469, USA.Search for more papers by this author David R. Brown, Corresponding Author David R. Brown Department of Biological Sciences, Southeastern Louisiana University, Hammond, Louisiana 70402 USA Corresponding author. Current address: Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, USA. Email: [email protected] Current address: Department of Biology, 5751 Murray Hall, University of Maine, Orono, Maine 04469, USA.Search for more papers by this authorJennifer A. Long, Corresponding Author Jennifer A. Long Department of Biological Sciences, Southeastern Louisiana University, Hammond, Louisiana 70402 USA Corresponding author. Current address: Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, USA. Email: [email protected] Current address: Department of Biology, 5751 Murray Hall, University of Maine, Orono, Maine 04469, USA.Search for more papers by this author First published: 20 November 2006 https://doi.org/10.1111/j.1557-9263.2006.00071.xCitations: 10Read 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 onEmailFacebookTwitterLinkedInRedditWechat Abstracten ABSTRACT Food is generally considered to be the primary resource structuring winter territories in migrant songbirds, but there is little experimental evidence to support this. In southeastern Louisiana, ripe fruits, consumed opportunistically in the absence of preferred arthropod resources, are a primary food resource for wintering Hermit Thrushes (Catharus guttatus). To test the possible role of food in controlling space use during the winter, we reduced fruit availability in the territories of wintering Hermit Thrushes and compared responses of these thrushes to those in control territories where fruit availability was not altered. We found that thrushes did not adjust either territory size or location in response to midwinter reduction of fruit availability. One possible explanation for this lack of response is that sufficient food, including arthropods, was available in thrush territories even after removal of fruit. Another possibility is that the removal of fruit did reduce food levels below the level needed to meet energetic needs, but social constraints on territory structure, dictated by fall settlement spacing and maintained by agonistic interactions, prevented birds from adjusting territories to match food supply later in the season. SINOPSISes El alimento es generalmente considerado la fuente principal que estructura los territorios de invierno de aves canoras migratorias. Sin embargo, hay poca evidencia experimental para sostener dicha hipótesis. En el suroeste de Louisiana, en ausencia de los artrópodos de su predilección, la fuente principal de alimentos de individuos invernales del zorzal Catharus guttatus lo son frutas. Para poner a pruebas el posible rol del alimento en el control de espacio durante el invierno, se redujo la disponibilidad de frutas en el territorio de los zorzales y comparamos sus respuestas con individuos en territorios controles, en donde no se altero la disponibilidad de frutas. Encontramos que los zorzales no ajustaron el tamaño del territorio o la localizacion en respuesta a la reducción de frutas. Una posible explicación es que todavía quedaba en los territorios suficiente alimento, incluyendo artrópodos, para cumplir con la demanda energética de las aves. Otra posibilidad es que la remoción de frutas, sí redujo de forma crítica la cantidad de alimento. Sin embargo, los zorzales, ya tarde en la temporada, no pudieron ajustar el tamaño del territorio para cumplir con sus demandas energéticas, por las limitaciones sociales en la estructura del territorio dictado por la magnitud de los espacios otoñales y mantenido por interacciones agresivas entre vecinos. 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