Drivers of clutch-size in Fork-tailed Flycatchers (<i>Tyrannus savana</i>) at temperate and tropical latitudes in South America

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...

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Detalles Bibliográficos
Autores principales: Jahn, Alex E., Tuero, Diego Tomás, Mamani, Ana María, Bejarano, Vanesa, Masson, Diego Aníbal, Aguilar, Eluney
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Naturales
Tyrannus savana
Aves
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/101489
https://ri.conicet.gov.ar/11336/86054
https://www.tandfonline.com/doi/abs/10.1071/MU13084
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-101489
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Tyrannus savana
Aves
spellingShingle Ciencias Naturales
Tyrannus savana
Aves
Jahn, Alex E.
Tuero, Diego Tomás
Mamani, Ana María
Bejarano, Vanesa
Masson, Diego Aníbal
Aguilar, Eluney
Drivers of clutch-size in Fork-tailed Flycatchers (<i>Tyrannus savana</i>) at temperate and tropical latitudes in South America
topic_facet Ciencias Naturales
Tyrannus savana
Aves
description 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 (<i>Tyrannus savana</i>) 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.
format Articulo
Articulo
author Jahn, Alex E.
Tuero, Diego Tomás
Mamani, Ana María
Bejarano, Vanesa
Masson, Diego Aníbal
Aguilar, Eluney
author_facet Jahn, Alex E.
Tuero, Diego Tomás
Mamani, Ana María
Bejarano, Vanesa
Masson, Diego Aníbal
Aguilar, Eluney
author_sort Jahn, Alex E.
title Drivers of clutch-size in Fork-tailed Flycatchers (<i>Tyrannus savana</i>) at temperate and tropical latitudes in South America
title_short Drivers of clutch-size in Fork-tailed Flycatchers (<i>Tyrannus savana</i>) at temperate and tropical latitudes in South America
title_full Drivers of clutch-size in Fork-tailed Flycatchers (<i>Tyrannus savana</i>) at temperate and tropical latitudes in South America
title_fullStr Drivers of clutch-size in Fork-tailed Flycatchers (<i>Tyrannus savana</i>) at temperate and tropical latitudes in South America
title_full_unstemmed Drivers of clutch-size in Fork-tailed Flycatchers (<i>Tyrannus savana</i>) at temperate and tropical latitudes in South America
title_sort drivers of clutch-size in fork-tailed flycatchers (<i>tyrannus savana</i>) at temperate and tropical latitudes in south america
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/101489
https://ri.conicet.gov.ar/11336/86054
https://www.tandfonline.com/doi/abs/10.1071/MU13084
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