The road to opportunities: landscape change promotes body-size divergence in a highly mobile species

Current Zoology
Carlos CamachoJaime Potti

Abstract

Landscape change provides a suitable framework for investigating population-level responses to novel ecological pressures. However, relatively little attention has been paid to examine the potential influence of landscape change on the geographic scale of population differentiation. Here, we tested for morphological differentiation of red-necked nightjarsCaprimulgus ruficollisbreeding in a managed property and a natural reserve situated less than 10 km apart. At both sites, we also estimated site fidelity over 5 years and quantified the potential foraging opportunities for nightjars. Breeding birds in the managed habitat were significantly larger in size-as indexed by keel length-than those in the natural one. However, there were no significant differences in wing or tail length. Immigration from neighboring areas was almost negligible and, furthermore, no individual (out of 1130 captures overall) exchanged habitats between years, indicating strong site fidelity. Food supply for nightjars was equally abundant in both habitats, but the availability of foraging sites was remarkably higher in the managed property. As a result, nightjars-particularly fledglings-in the latter habitat benefited from increased foraging opportunities i...Continue Reading

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Citations

Mar 18, 2020·Environmental Pollution·Silvia EspínAntonio J García-Fernández

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Software Mentioned

ArcGIS10
pscl
lme4
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