Geography, Environmental Conditions and Life History Shape Patterns of Within-Population Phenotypic Variation in North American Birds.

ABSTRACT: Intraspecific variation is a fundamental component of biodiversity, shaping species interactions and coexistence dynamics. While numerous mechanisms have been proposed to shape the degree of phenotypic variation within species, many remain largely untested or poorly explored at broad spatial and taxonomic scales. Using data from nearly 200,000 bird captures from 99 species across North America, we investigated hypothesized drivers of within-population phenotypic variation, using body mass and wing length as traits of interest. The magnitude of observed phenotypic variation was modulated by a combination of geographic, environmental, and life history factors. This was true whether considering differences in within-population phenotypic variation within or among species. The impact of these

SUBMITTER: Zulian V 

PROVIDER: S-EPMC12596938 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature