applyparastyle "fig//caption/p[1]" parastyle "FigCapt" AmericanOrnithology.org Volume 138, 2021, pp. 1–15 DOI: 10.1093/ornithology/ukab009 SPECIAL FEATURE: Species Limits and Taxonomy in Birds Downloaded from https://academic.oup.com/auk/advance-article/doi/10.1093/ornithology/ukab009/6222128 by Louisiana State University user on 12 April 2021 Integrative taxonomy and geographic sampling underlie successful species delimitation Carla Cicero,1,*, Nicholas A. Mason,1,2, Rosa Alicia Jiménez,1,3,4, Daniel R. Wait,1,3 Cynthia Y. Wang- Claypool,1,3 and Rauri C. K. Bowie1,3, 1 Museum of Vertebrate Zoology, University of California, Berkeley, California, USA 2 Museum of Natural Science and Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, USA 3 Department of Integrative Biology, University of California, Berkeley, California, USA 4 Escuela de Biología, Universidad de San Carlos de Guatemala, Guatemala * Corresponding author:
[email protected] Submission Date: February 22, 2020; Editorial Acceptance Date: January 15, 2021; Published April 12, 2021 ABSTRACT Species delimitation requires a broad assessment of population-level variation using multiple lines of evidence, a process known as integrative taxonomy. More specifically, studies of species limits must address underlying questions of what limits the distribution of populations, how traits vary in association with different environments, and whether the observed trait differences may lead to speciation through reproductive isolation. While genomic data have revolutionized the process of delimiting species, such data should be analyzed along with phenotypic, behavioral, and ecological traits that shape individuals across geographic and environmental space. The integration of multiple traits promotes taxonomic stability and should be a major guiding principle for species delimitation.