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Eco-Evolutionary Consequences of Dispersal Syndromes during Colonization in a Passerine Bird.

Authors
  • Nicolaus, Marion
  • Ubels, Richard
  • Both, Christiaan
Type
Published Article
Journal
The American Naturalist
Publisher
The University of Chicago Press
Publication Date
Apr 01, 2023
Volume
201
Issue
4
Pages
523–536
Identifiers
DOI: 10.1086/723214
PMID: 36958003
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

AbstractIn most animal species, dispersing individuals possess phenotypic attributes that mitigate the costs of colonization and/or increase settlement success in new areas (dispersal syndromes). This phenotypic integration likely affects population dynamics and the direction of selection, but data are lacking for natural populations. Using an approach that combines population dynamics, quantitative genetics, and phenotypic selection analyses, we reveal the existence of dispersal syndromes in a pied flycatcher (Ficedula hypoleuca) population in the Netherlands: immigrants were larger, tended to have darker plumage, bred earlier, and produced larger clutches than local recruits, and some of these traits were genetically correlated. Over time, the phenotypic profile of the population gradually changed: each generation advanced arrival and breeding and exhibited longer wings as a result of direct and indirect selection on these correlated traits. Although phenotypic attributes of immigrants were favored by selection during the early phase of colonization, observed phenotypic changes were similar for immigrants and local recruits. We propose that immigrants facilitated initial population establishment but that temporal changes likely resulted from climate change-induced large-scale selection. This study highlights that newly established populations are of nonrandom composition and that phenotypic architecture affects evolutionary population trajectories.

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