Geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a South American genus Lessingianthus H.Rob. (Vernonieae, Asteraceae)

The distribution of ploidy levels and their ecological associations were studied using the genus Lessingianthus (Vernonieae, Asteraceae) as a model system. This genus is very complex from a cytogenetic point of view, with high cytotype diversity at the interspecific and intraspecific levels and with...

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Autores principales: Angulo, María Betiana, Florentín, Javier Elías, Via Do Pico, Gisela Mariel
Formato: Artículo
Lenguaje:Inglés
Publicado: Elsevier 2025
Materias:
Chromosome counts
Ecological niche modeling
Ecoregions
Neotropics
Niche overlap
Polyploidy
Phylogenetic niche conservatism
Vernonieae
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/58883
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
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spelling I48-R184-123456789-588832025-11-03T13:51:06Z Geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a South American genus Lessingianthus H.Rob. (Vernonieae, Asteraceae) Angulo, María Betiana Florentín, Javier Elías Via Do Pico, Gisela Mariel Chromosome counts Ecological niche modeling Ecoregions Neotropics Niche overlap Polyploidy Phylogenetic niche conservatism Vernonieae The distribution of ploidy levels and their ecological associations were studied using the genus Lessingianthus (Vernonieae, Asteraceae) as a model system. This genus is very complex from a cytogenetic point of view, with high cytotype diversity at the interspecific and intraspecific levels and with a continuous distribution throughout South America. So far, no previous studies have summarized chromosome count data for Lessingianthus or addressed the cytogeography of the genus. In this study, the ploidy levels of Lessingianthus species were determined by chromosome counts during mitosis and ecological niche modelling (ENM) was used to compare the environmental associations ofthe diploid and polyploid cytotypes. In total, 28 chromosome counts and six ploidy levels (2x, 4x, 6x, 8x, 10x, and 11x) were recorded. Among these counts, the chromosome numbers for three hexaploids with 2 n = 96 (L. parvifolius, L. vepretorum and L. “bolivianensis” sp. ined.) and one decaploid taxon with 2 n = 160 (L. roseus) were reported for the first time. In addition, a new cytotype for L. laniferus (2 n = 6x = 96) was also reported. The cytogeographic analysis resulted in detecting two geographic zones with high diversity of cytotypes and species. The ENMs showed that the areas of climatic suitability of diploids and polyploids are similar in extent, as well as the climatic requirements, showing high values of niche overlap within the environmental space. Our findings suggested that polyploidization in Lessingianthus has not caused expansion to novel environmental conditions and phylogenetic niche conservatism (PNC) may explain the lack of niche differentiation between diploids and polyploids. 2025-11-03T12:07:32Z 2025-11-03T12:07:32Z 2023-01 Artículo Angulo, María Betiana, Florentín, Javier Elías y Via Do Pico, Gisela Mariel, 2023. Geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a South American genus Lessingianthus H.Rob. (Vernonieae, Asteraceae). Perspectives in Plant Ecology, Evolution and Systematics. Países Bajos: Elsevier, no. 58, p. 1-13. E-ISSN 1618-0437. DOI https://doi.org/10.1016/j.ppees.2023.125719 1433-8319 http://repositorio.unne.edu.ar/handle/123456789/58883 eng https://doi.org/10.1016/j.ppees.2023.125719 openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 1-13 application/pdf Elsevier Perspectives in Plant Ecology, Evolution and Systematics, 2023, no. 58, p. 1-13.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Chromosome counts
Ecological niche modeling
Ecoregions
Neotropics
Niche overlap
Polyploidy
Phylogenetic niche conservatism
Vernonieae
spellingShingle Chromosome counts
Ecological niche modeling
Ecoregions
Neotropics
Niche overlap
Polyploidy
Phylogenetic niche conservatism
Vernonieae
Angulo, María Betiana
Florentín, Javier Elías
Via Do Pico, Gisela Mariel
Geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a South American genus Lessingianthus H.Rob. (Vernonieae, Asteraceae)
topic_facet Chromosome counts
Ecological niche modeling
Ecoregions
Neotropics
Niche overlap
Polyploidy
Phylogenetic niche conservatism
Vernonieae
description The distribution of ploidy levels and their ecological associations were studied using the genus Lessingianthus (Vernonieae, Asteraceae) as a model system. This genus is very complex from a cytogenetic point of view, with high cytotype diversity at the interspecific and intraspecific levels and with a continuous distribution throughout South America. So far, no previous studies have summarized chromosome count data for Lessingianthus or addressed the cytogeography of the genus. In this study, the ploidy levels of Lessingianthus species were determined by chromosome counts during mitosis and ecological niche modelling (ENM) was used to compare the environmental associations ofthe diploid and polyploid cytotypes. In total, 28 chromosome counts and six ploidy levels (2x, 4x, 6x, 8x, 10x, and 11x) were recorded. Among these counts, the chromosome numbers for three hexaploids with 2 n = 96 (L. parvifolius, L. vepretorum and L. “bolivianensis” sp. ined.) and one decaploid taxon with 2 n = 160 (L. roseus) were reported for the first time. In addition, a new cytotype for L. laniferus (2 n = 6x = 96) was also reported. The cytogeographic analysis resulted in detecting two geographic zones with high diversity of cytotypes and species. The ENMs showed that the areas of climatic suitability of diploids and polyploids are similar in extent, as well as the climatic requirements, showing high values of niche overlap within the environmental space. Our findings suggested that polyploidization in Lessingianthus has not caused expansion to novel environmental conditions and phylogenetic niche conservatism (PNC) may explain the lack of niche differentiation between diploids and polyploids.
format Artículo
author Angulo, María Betiana
Florentín, Javier Elías
Via Do Pico, Gisela Mariel
author_facet Angulo, María Betiana
Florentín, Javier Elías
Via Do Pico, Gisela Mariel
author_sort Angulo, María Betiana
title Geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a South American genus Lessingianthus H.Rob. (Vernonieae, Asteraceae)
title_short Geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a South American genus Lessingianthus H.Rob. (Vernonieae, Asteraceae)
title_full Geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a South American genus Lessingianthus H.Rob. (Vernonieae, Asteraceae)
title_fullStr Geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a South American genus Lessingianthus H.Rob. (Vernonieae, Asteraceae)
title_full_unstemmed Geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a South American genus Lessingianthus H.Rob. (Vernonieae, Asteraceae)
title_sort geographic distribution and climatic niche comparison between diploid updates and polyploid cytotypes of a south american genus lessingianthus h.rob. (vernonieae, asteraceae)
publisher Elsevier
publishDate 2025
url http://repositorio.unne.edu.ar/handle/123456789/58883
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