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Phylogenetic and functional relationships in pastures and meadows from the North Adriatic Karst
Pipenbaher, Nataša ...
Probably due to its phytogeographic position, the grasslands in the North Adriatic Karst are among the richest grasslands in the world and harbour the highest small-scale density of plant species ...found in terrestrial habitats. Different moisture and soil conditions determine distinct vegetation types, such as meadows, composed by mesophyllous plants and on mesic conditions, and semi-natural pastures, composed by sclerophyllous plants and on oligotrophic conditions. Even though plants in these two vegetation types differ in some of their attributes, their functional and phylogenetic relationships remain to be tested. We used a dataset comprising 180 species, in which 48 plots in the meadows and 52 plots in the pastures had been sampled, and tested the phylogenetic and functional relationships between the two vegetation types. The pastures contained more original species, but both the pastures and the meadows are expected to be important to increase biodiversity at landscape level. Different community assembly processes occurred in the two vegetation types, with limiting similarity leading to functional overdispersion in the meadows and environmental filtering leading to functional clustering in the pastures. Overall, traits were convergent, leading to a clustered phylogenetic structure in the meadows, probably due to pair-wise competition, and an overdispersed phylogenetic structure in the pastures, where species from different clades were filtered by the oligotrophic conditions. Transhumance may have contributed to the random pattern of trait diversity we found across the nodes of the phylogenetic tree.
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