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Dryad

Data from: Historical reconstruction of climatic and elevation preferences and the evolution of cloud forest-adapted tree ferns in Mesoamerica

Cite this dataset

Sosa, Victoria; Ornelas, Juan Francisco; Ramírez-Barahona, Santiago; Gándara, Etelvina (2017). Data from: Historical reconstruction of climatic and elevation preferences and the evolution of cloud forest-adapted tree ferns in Mesoamerica [Dataset]. Dryad. https://doi.org/10.5061/dryad.709t8

Abstract

Background. Cloud forest, characterized by a persistent, frequent or seasonal low-level cloud cover and a fragmented distribution, is one of the most threatened habitats especially in the Neotropics. Tree ferns are among the most conspicuous elements in these forests and ferns are restricted to regions in which minimum temperatures rarely drop below freezing and rainfall is high and evenly distributed around the year. Current phylogeographic data suggest that some of the cloud forest-adapted species remained in situ or expanded to the lowlands during glacial cycles and contracted allopatrically during the interglacials. Although the observed genetic signals of population size changes of cloud forest-adapted species including tree ferns correspond to predicted changes by Pleistocene climate change dynamics, the observed patterns of intraspecific lineage divergence showed temporal incongruence. Methods. Here we combined phylogenetic analyses, ancestral area reconstruction, and divergence time estimates with climatic and altitudinal data (environmental space) for phenotypic traits of tree fern species to make inferences about evolutionary processes in deep time. We used phylogenetic Bayesian inference and geographic and altitudinal distribution of tree ferns to investigate the ancestral area and elevation and environmental preferences of Mesoamerican tree ferns. The phylogeny was then used to estimate divergence times and ask whether the ancestral area and elevation and environmental shifts were linked to climatic events and historical climatic preferences. Results. Bayesian trees retrieved Cyathea, Alsophila, Gymnosphaera and Sphaeropteris in monophyletic clades. Splits for species in these genera found in the Mesoamerican cloud forests are recent, from the Neogene to the Quaternary. Australia was identified as the ancestral area for the clades of these genera, except for Gymnosphaera that was Mesoamerica. Climate tolerance was not divergent from hypothesized ancestors for the four most significant variables or elevation. For elevational shifts we found repeated changes from low to high elevations. Conclusions. Our data suggest that representatives of Cyatheaceae main lineages migrated from Australia to Mesoamerican cloud forests in different times and have persisted in these environmentally unstable areas but extant species diverged recently from their ancestors.

Usage notes

Location

Mesoamerica