12/17/2022 0 Comments Team reis idm patch downloadThe data were analysed by frequency histograms, factor analysis of mixed data, and regression trees. In the same plots, we collected data on edaphic, topographic, and land-use variables. We randomly allocated 14,100 × 100 m plots, where all palms had the diameter at breast height (dbh) and the total height (th) measured. Here, we investigated how environmental variables impact the structure of B. A vast area of its natural habitat has been lost by land-use changes, placing the species at high risk of extinction. is a subtropical endemic palm tree that occurs in the Southern Brazilian Highlands. Although this study highlights the importance of analyzing both population ecology parameters and genetic data to better understand the level of risk facing threatened species, we emphasize that policy actions are urgently needed for effective conservation of this vulnerable biological resource.īutia eriospatha (Mart. With no recruitment and a mortality rate of 2.0%, we show that the populations investigated in this study would be at an extremely high risk of local extinction, with a greater than 50% reduction in the effective population size, in the next 40 years. The amount of observed heterozygosity differed significantly between small (H O = 0.329) and large populations (H O = 0.461), indicating that small populations can be more susceptible to genetic drift. eriospatha showed high levels of genetic differentiation (F ST adult plants = 0.287, F ST seedlings = 0.175). For 1 population, we describe and quantify for the first time the occurrence of 6 ontogenetic stages for this threatened palm species. eriospatha populations showed a bimodal age structure made up of adult plants and seedlings and high rates (>77%) of livestock herbivory. eriospatha population areas severely affect their demographic structure. Our results indicate that cattle grazing in B. To estimate the risk of population decline for the threatened palm species Butia eriospatha, we investigated the patterns of demography, natural regeneration, herbivory, and the levels of genetic diversity using 9 microsatellite loci from both adults and seedlings sampled from 4 populations in Southern Brazil (n = 330).
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