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4 results for “OCBILs”
Is the age of plant communities predicted by the age, stability and soil composition of the underlying landscapes? An investigation of OCBILs
<p></p><p>Old, climatically buffered, infertile landscapes (OCBILs) have been hypothesized to harbour an elevated number of persistent plant lineages and are predicted to occur across different parts of the globe, interspersed with other types of landscapes. We tested whether the mean age of a plant community is associated with occurrence on OCBILs, as predicted by climatic stability and poor soil environments. Using digitized occurrence data for seed plants occurring in Australia (7033 species), sub-Saharan Africa (3990 species) and South America (44 482 species), regions that comprise commonly investigated OCBILs (Southwestern Australian Floristic Region, Greater Cape Floristic Region and campos rupestres), and phylogenies pruned to match the species occurrences, we tested for associations between environmental data (current climate, soil composition, elevation and climatic stability) and two novel metrics developed here that capture the age of a community (mean tip length and mean node height). Our results indicate that plant community ages are influenced by a combination of multiple environmental predictors that vary globally; we did not find statistically strong associations between the environments of OCBIL areas and community age, in contrast to the prediction for these landscapes. The Cape Floristic Region was the only OCBIL that showed a significant, although not strong, overlap with old communities.</p><p></p>
Is the age of plant communities predicted by the age, stability and soil composition of the underlying landscapes? An investigation of OCBILs
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Inselberg, taxa, environment data for Inselberg floristics exemplify coast to inland OCBIL transition in a global diversity hotspot
<p>We examined floristics of granitoid inselbergs in the hitherto poorly documented southeastern region of the Southwest Australian Floristic Region (SWAFR) and adjacent Great Western Woodlands, addressing several hypotheses of OCBIL theory. We found exceptional taxon richness (1,550 taxa on 89 inselbergs, with 58 well-sampled inselbergs and 1493 taxa chosen for detailed analyses). Granite inselberg endemism declines towards the arid inland, though taxon richness does not. OCBILs are likely found up to 500 km inland, not ca. 300 km as previously hypothesized. Hybrids are extremely rare on the 58 inselbergs analysed, whereas rare species, including singletons, are abundant. Conversely, exotic weeds are less common than in the whole SWAFR flora (8.2% vs 12.8%). Granite plant communities are distributed in parallel bands to the south coast, approximating the general transition from the Esperance and Boylya Floristic Districts across the SWAFR boundary north into the Arid Zone's Great Western Woodlands. Positive correlations exist between several plant life forms and inselberg area, save for geophytes. There is a decrease from the coast inland for most life forms, except for annual and graminoid herbs that increase in taxa inland. Thus, inselberg floristics exemplify the coast-to-inland OCBIL transition in this global biodiversity hotspot.</p>
Inselberg, taxa, environment data for Inselberg floristics exemplify coast to inland OCBIL transition in a global diversity hotspot
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