Data from: Environmental niche conservatism explains the accumulation of species richness in Mediterranean-hotspot plant genera
| Main Authors: | Skeels, Alex, Cardillo, Marcel, Skeels, Alexander |
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| Format: | info dataset Journal |
| Terbitan: |
, 2017
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/4939200 |
Daftar Isi:
- The causes of exceptionally high plant diversity in Mediterranean-climate biodiversity hotspots are not fully understood. We asked whether a mechanism similar to the tropical niche conservatism hypothesis could explain the diversity of four large genera (Protea, Moraea, Banksia, and Hakea) with distributions within and adjacent to the Greater Cape Floristic Region (South Africa) or the Southwest Floristic Region (Australia). Using phylogenetic and spatial data we estimated the environmental niche of each species, and reconstructed the mode and dynamics of niche evolution, and the geographic history, of each genus. For three genera there were strong positive relationships between the diversity of clades within a region and their inferred length of occupation of that region. Within genera, there was evidence for strong evolutionary constraint on niche axes associated with climatic seasonality and aridity, with different niche optima for hotspot and non-hotspot clades. Evolutionary transitions away from hotspots were associated with increases in niche breadth and elevated rates of niche evolution. Our results point to a process of "hotspot niche conservatism" whereby the accumulation of plant diversity in Mediterranean-type ecosystems results from longer time for speciation, with dispersal away from hotspots limited by narrow and phylogenetically-conserved environmental niches.
- banksia.climateOccurrence data from AVH and climate data from CLiMOND for the genus Banksia.hakea.climateOccurence data from AVH and climate data from CLiMond for the genus Hakeaprotea.climateOccurrence records from SANBi and climate data from CLiMond for the genus Proteamoraea.climateOccurrence records from SANBi and climate data from CLiMond for the genus MoraeaOUwie_model_comparison_results_all_generaThis compressed folder contains results from an evolutionary model comparison of 5 OU (OU1, OUM, OUMA, OUMV, OUMVA) and 2 BM (BMS, BMM) models in the R package OUwie. We investiagted 9 environmental niche axes in each of the four genera. for each niche axis we reran the model comparison 50 times across 50 different stochastic maps derived from a BioGeoBEARS analysis in R. So here we present, for each genus, nine .csv files containing the results of 50 different model comparisons.