Producción CyT
Congreso
Autoría
Aagesen Lone
;
Salariato, Diego Lionel
;
SCATAGLINI, MARIA AMALIA
;
Acosta, Juan
;
Fortunato, Renee Hersilia
Fecha
2024
Editorial y Lugar de Edición
Fase 20 Ediciones
ISSN
978-84-09-63656-3
Resumen
Información suministrada por el agente en
SIGEVA
Inspired by large scale studies from all over the world, researches at the Darwinion Botanical Institute are currently assembling spatial and phylogenetic datasets, aiming to analyze the distribution of the native Southern Cone vascular flora in a phylogenetic context. Working at generic level, we will explore several diversity metrics and randomization tests within the framework of Phylogenetic Diversity. We aim to identify which areas contain the largest amount of vascular plant evolution, wh...
Inspired by large scale studies from all over the world, researches at the Darwinion Botanical Institute are currently assembling spatial and phylogenetic datasets, aiming to analyze the distribution of the native Southern Cone vascular flora in a phylogenetic context. Working at generic level, we will explore several diversity metrics and randomization tests within the framework of Phylogenetic Diversity. We aim to identify which areas contain the largest amount of vascular plant evolution, which areas contain the oldest lineages and where new ones are evolving. However, the history of individual plant families inevitably gets lost, when the big picture of spatial phylogenetic diversity patterns is assembled for all vascular plants. We therefor plan to analyze selected families such as Poaceae, Fabaceae, and Asteraceae on their own, because of their unique evolutions within different timeframes and/or in distinct ecoregions of the Southern Cone. We have recently concluded the analysis of the grass family. Grasses appear to have been present in South America since its early evolution as tropical understory species more than 60 My years ago. We found that tropical humid regions hold the highest phylogenetic diversity with no observed bias in branch lengths, indicating that niche conservatism dominates the diversity pattern of grasses in the Southern Cone. We found significantly low phylogenetic diversity in the Arid Chaco and in the Patagonian Steppe, which suggest ecological filtering in both warm and cold arid regions. The Patagonian Steppe also holds significantly longer branches than expected by chance, as the native grass flora is mainly composed of distantly related Pooideae genera with a northern hemisphere origin. Short branches are found in the Uruguayan Savanna suggesting that these grasslands could be a cradle for grass diversity within the Southern Cone. We are currently assembling the data for Legumes that appear to tell a different history.
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Palabras Clave
SOUTHERN CONENATIVE FLORASPATIAL PHYLOGENETICSSOUTH AMERICA