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oai:docta.ucm.es:20.500.14352/1212392025-06-11T23:55:16Zcom_20.500.14352_14col_20.500.14352_15

Climatic amplitude is a predictor of geographic range size in Mexican morning glories (Ipomoea L., Convolvulaceae) Deloya Brito, Erick C. Clay, Cameron McIntyre, Patrick J. Piña de la Rosa, Itzel A. Scotland, Robert W. Muñoz Rodríguez, Pablo Cacho, N. Ivalu 574.5 581.9(72) Biogeography Conservation Ecological niche Geographic distribution Niche breadth Range size limits Ecología (Biología) 2417.13 Ecología Vegetal 2505.01-1 Biogeografía Botánica Funding was provided by UNAM’s DGAPA-PAPIIT program (awards IN213220 and IN220323 to NIC) through projects "Diversidad, sistemática y evolución de camotes, campanillas y cazahuates (Ipomoea, Convolvulaceae), un enfoque integrativo, and Tendiendo puentes entre micro- y macroevolucióin: iden-tificando casos con alto potencial de especiación en Ipomoea, un clado diverso y poco estudiado". Background: Elucidating the determinants of species’ geographic distributions is a fundamental goal of ecology and biogeography, as they can inform about key biological processes, with implications for conservation. Goal: Evaluate whether realized climatic amplitude (a proxy for niche breadth) is an ecological correlate of geographic range size in morning glories in Mexico, a highly diverse group of plants of worldwide socio-economic relevance, but still poorly studied. Methods: Based on a dataset of > 30,000 records of which > 7,000 were manually georeferenced, we calculated geographic range size (using convex hull polygons and buffered occurrence points), and climatic amplitude (using three first axes of Principal Components based on 19 Worldclim variables, and focusing on temperature, precipitation, and seasonality), and explored their relationship using general linear models and phylogenetic generalized least squares. Results: All models show that climatic amplitude explains a high proportion of variation in geographic range size for our dataset (up to > 69 %). We find no evidence of tradeoffs related to temperature and precipitation niche breadths. Through review of reported records, we update the number of species of Ipomoea reported for Mexico to 178. Conclusions: Much of the variation in geographic range size in Mexican Ipomoea can be explained by realized climatic amplitude, and this result is not driven by phylogenetic history. We discuss cases where despite large geographic range sizes, narrow climatic amplitudes can signify higher risks for species in the face of changing environments. Universidad Nacional Autónoma de México Depto. de Biodiversidad, Ecología y Evolución Fac. de Ciencias Biológicas TRUE pub 2025-06-11T18:23:51Z 2025-06-11T18:23:51Z 2023-09 journal article VoR https://hdl.handle.net/20.500.14352/121239 2007-4298 10.17129/botsci.3322 2007-4476 eng Deloya Brito EC, Clay C, McIntyre PJ, Piña-de La Rosa IA, Scotland RW, Muñoz-Rodríguez P, Cacho NI. Climatic amplitude is a predictor of geographic range size in Mexican morning glories (Ipomoea L., Convolvulaceae). Bot Sci 2023;101:1016–33. https://doi.org/10.17129/botsci.3322. Attribution-NonCommercial 4.0 International http://creativecommons.org/licenses/by-nc/4.0/ open access application/pdf Sociedad Botánica de México