Niche shifts and energetic condition of songbirds in response to phenology of food-resource availability in a high-elevation sagebrush ecosystem
| Autor: | Nathan Korb, Scott R. McWilliams, Erik A. Beever, Kyle A. Cutting, Eric Klaphake, Michelle L. Anderson, Sean R. Schroff |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Vesper sparrow Sparrow biology Spizella Ecology Phenology 010604 marine biology & hydrobiology Niche biology.organism_classification 010603 evolutionary biology 01 natural sciences Productivity (ecology) Sympatric speciation biology.animal Animal Science and Zoology Ecosystem Ecology Evolution Behavior and Systematics |
| Zdroj: | The Auk. 133:685-697 |
| ISSN: | 1938-4254 0004-8038 |
| DOI: | 10.1642/auk-16-4.1 |
| Popis: | Seasonal fluctuations in food availability can affect diets of consumers, which in turn may influence the physiological state of individuals and shape intra- and inter-specific patterns of resource use. High-elevation ecosystems often exhibit a pronounced seasonal “pulse” in productivity, although few studies document how resource use and energetic condition by avian consumers change in relation to food-resource availability in these ecosystems. We tested the hypothesis that seasonal increases (pulses) in food resources in high-elevation sagebrush ecosystems result in 2 changes after the pulse, relative to the before-pulse period: (1) reduced diet breadth of, and overlap between, 2 sympatric sparrow species; and (2) enhanced energetic condition in both species. We tracked breeding-season diets using stable isotopes and energetic condition using plasma metabolites of Brewer's Sparrows (Spizella breweri), Vesper Sparrows (Pooecetes gramineus), and their food resources during 2011, and of only Brewe... |
| Databáze: | OpenAIRE |
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