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Abstract:

Many species of birds exhibit a latitudinal gradient in annual reproductive investment, laying more eggs and producing more nestlings at higher latitudes. However, few studies have evaluated the mechanisms that underlie such patterns and such differences in grassland birds specifically. We monitored nests of Fork-tailed Flycatchers (Tyrannus savana) over two breeding seasons at a tropical site in Bolivia (in 2010-11 and 2011-12) and three breeding seasons at a southern temperate site in Argentina (2010-11, 2011-12 and 2012-13), testing two hypotheses explaining variation in clutch-size among populations: the food-limitation hypothesis and the nest-predation hypothesis. Mean clutch-size and mean brood-size were significantly larger at the temperate study site than at the tropical site. Availability of arthropod food per individual bird was significantly higher at the temperate site. There was no relationship, positive or negative, between rates of nest predation and either clutch- or brood-size, and thus no support for the nest-predation hypothesis. We conclude that food availability explains much of the latitudinal variation in clutch-size in this species. We discuss avenues for future research on the mechanisms underlying geographical variation in the life histories of Neotropical birds. © 2014 BirdLife Australia.

Registro:

Documento: Artículo
Título:Drivers of clutch-size in Fork-tailed Flycatchers (Tyrannus savana) at temperate and tropical latitudes in South America
Autor:Jahn, A.E.; Tuero, D.T.; Mamani, A.M.; Bejarano, V.; Masson, D.A.; Aguilar, E.
Filiación:Departamento de Zoologia, Universidade Estadual Paulista - Rio Claro, Avenida 24a 1515, Rio-Claro-São-Paulo, CEP 13506-900, Brazil
Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Int. Güiraldes 2160 - Pabellón II, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Museo de Historia Natural Noel Kempff Mercado, Avenida Irala 565, Santa-Cruz-de-la-Sierra, Bolivia
Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Avenida 122 y 60, La Plata, Buenos Aires, B1904CCA, Argentina
Palabras clave:arthropod; breeding season; brood size; clutch size; food availability; geographical variation; latitudinal gradient; life history trait; Neotropical Region; passerine; temperate environment; tropical environment; Argentina; Bolivia; Tyrannus savana
Año:2014
Volumen:114
Número:4
Página de inicio:337
Página de fin:342
DOI: http://dx.doi.org/10.1071/MU13084
Título revista:Emu
Título revista abreviado:Emu
ISSN:01584197
CODEN:EMUMA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01584197_v114_n4_p337_Jahn

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Citas:

---------- APA ----------
Jahn, A.E., Tuero, D.T., Mamani, A.M., Bejarano, V., Masson, D.A. & Aguilar, E. (2014) . Drivers of clutch-size in Fork-tailed Flycatchers (Tyrannus savana) at temperate and tropical latitudes in South America. Emu, 114(4), 337-342.
http://dx.doi.org/10.1071/MU13084
---------- CHICAGO ----------
Jahn, A.E., Tuero, D.T., Mamani, A.M., Bejarano, V., Masson, D.A., Aguilar, E. "Drivers of clutch-size in Fork-tailed Flycatchers (Tyrannus savana) at temperate and tropical latitudes in South America" . Emu 114, no. 4 (2014) : 337-342.
http://dx.doi.org/10.1071/MU13084
---------- MLA ----------
Jahn, A.E., Tuero, D.T., Mamani, A.M., Bejarano, V., Masson, D.A., Aguilar, E. "Drivers of clutch-size in Fork-tailed Flycatchers (Tyrannus savana) at temperate and tropical latitudes in South America" . Emu, vol. 114, no. 4, 2014, pp. 337-342.
http://dx.doi.org/10.1071/MU13084
---------- VANCOUVER ----------
Jahn, A.E., Tuero, D.T., Mamani, A.M., Bejarano, V., Masson, D.A., Aguilar, E. Drivers of clutch-size in Fork-tailed Flycatchers (Tyrannus savana) at temperate and tropical latitudes in South America. Emu. 2014;114(4):337-342.
http://dx.doi.org/10.1071/MU13084