Ecological determinants of Tyrannus flycatcher nestling growth at north-And south-Temperate latitudes
An organism's life history strategy is made up of a suite of physiological, behavioral, and ecological traits, which vary at both the interspecific and intraspecific levels in accordance with selective pressures operating on individuals. For birds, 2 primary ecological factors have been propose...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v135_n3_p439_Tuero http://hdl.handle.net/20.500.12110/paper_00048038_v135_n3_p439_Tuero |
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paper:paper_00048038_v135_n3_p439_Tuero2023-06-08T14:29:42Z Ecological determinants of Tyrannus flycatcher nestling growth at north-And south-Temperate latitudes Argentina Growth rate Life history Oklahoma Predation Rain Tyrannidae growth rate growth response hypothesis testing insectivore interspecific variation intraspecific variation life history nestling passerine temperate environment Aves Tyrannidae Tyrannus Tyrannus forficatus Tyrannus savana An organism's life history strategy is made up of a suite of physiological, behavioral, and ecological traits, which vary at both the interspecific and intraspecific levels in accordance with selective pressures operating on individuals. For birds, 2 primary ecological factors have been proposed to explain intraspecific and interspecific variation in nestling growth: nest predation and food availability. Individual nestling growth rates have important consequences for overall fitness because growth speed could influence subsequent reproductive performance and survival. We studied the relationship between ecological factors (i.e. precipitation level and predation rate) and nestling growth patterns of 2 New World flycatcher species (Tyrannidae) of the genus Tyrannus (Fork-Tailed Flycatcher T. savana and Scissor-Tailed Flycatcher T. forficatus) breeding at south-And north-Temperate latitudes. We tested the hypothesis that nestling growth rates are driven by nest predation rates and predicted that nestling growth rates would be higher in species experiencing higher nest predation rates. We also tested the hypothesis that nestling growth rates are related to precipitation levels (a proxy for food abundance) and predicted that nestling growth rates would be higher at sites with higher precipitation levels. Growth rate was not associated with predation rate, but it varied with precipitation level, with faster nestling growth rates during wet years for the Scissor-Tailed Flycatcher living at north-Temperate latitudes. Among species, similar growth rates were found during wet years. These results indicate that, at least as proximate causes, precipitation explains intraspecific and interspecific growth rate variation in Tyrannus species to a larger degree than predation. Additionally, the variation in growth rate we observed between wet and dry years indicates a high level of plasticity in growth rate in this group of insectivorous birds. © 2018 American Ornithological Society. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v135_n3_p439_Tuero http://hdl.handle.net/20.500.12110/paper_00048038_v135_n3_p439_Tuero |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Growth rate Life history Oklahoma Predation Rain Tyrannidae growth rate growth response hypothesis testing insectivore interspecific variation intraspecific variation life history nestling passerine temperate environment Aves Tyrannidae Tyrannus Tyrannus forficatus Tyrannus savana |
| spellingShingle |
Argentina Growth rate Life history Oklahoma Predation Rain Tyrannidae growth rate growth response hypothesis testing insectivore interspecific variation intraspecific variation life history nestling passerine temperate environment Aves Tyrannidae Tyrannus Tyrannus forficatus Tyrannus savana Ecological determinants of Tyrannus flycatcher nestling growth at north-And south-Temperate latitudes |
| topic_facet |
Argentina Growth rate Life history Oklahoma Predation Rain Tyrannidae growth rate growth response hypothesis testing insectivore interspecific variation intraspecific variation life history nestling passerine temperate environment Aves Tyrannidae Tyrannus Tyrannus forficatus Tyrannus savana |
| description |
An organism's life history strategy is made up of a suite of physiological, behavioral, and ecological traits, which vary at both the interspecific and intraspecific levels in accordance with selective pressures operating on individuals. For birds, 2 primary ecological factors have been proposed to explain intraspecific and interspecific variation in nestling growth: nest predation and food availability. Individual nestling growth rates have important consequences for overall fitness because growth speed could influence subsequent reproductive performance and survival. We studied the relationship between ecological factors (i.e. precipitation level and predation rate) and nestling growth patterns of 2 New World flycatcher species (Tyrannidae) of the genus Tyrannus (Fork-Tailed Flycatcher T. savana and Scissor-Tailed Flycatcher T. forficatus) breeding at south-And north-Temperate latitudes. We tested the hypothesis that nestling growth rates are driven by nest predation rates and predicted that nestling growth rates would be higher in species experiencing higher nest predation rates. We also tested the hypothesis that nestling growth rates are related to precipitation levels (a proxy for food abundance) and predicted that nestling growth rates would be higher at sites with higher precipitation levels. Growth rate was not associated with predation rate, but it varied with precipitation level, with faster nestling growth rates during wet years for the Scissor-Tailed Flycatcher living at north-Temperate latitudes. Among species, similar growth rates were found during wet years. These results indicate that, at least as proximate causes, precipitation explains intraspecific and interspecific growth rate variation in Tyrannus species to a larger degree than predation. Additionally, the variation in growth rate we observed between wet and dry years indicates a high level of plasticity in growth rate in this group of insectivorous birds. © 2018 American Ornithological Society. |
| title |
Ecological determinants of Tyrannus flycatcher nestling growth at north-And south-Temperate latitudes |
| title_short |
Ecological determinants of Tyrannus flycatcher nestling growth at north-And south-Temperate latitudes |
| title_full |
Ecological determinants of Tyrannus flycatcher nestling growth at north-And south-Temperate latitudes |
| title_fullStr |
Ecological determinants of Tyrannus flycatcher nestling growth at north-And south-Temperate latitudes |
| title_full_unstemmed |
Ecological determinants of Tyrannus flycatcher nestling growth at north-And south-Temperate latitudes |
| title_sort |
ecological determinants of tyrannus flycatcher nestling growth at north-and south-temperate latitudes |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v135_n3_p439_Tuero http://hdl.handle.net/20.500.12110/paper_00048038_v135_n3_p439_Tuero |
| _version_ |
1768541778316623872 |