ARPHA Conference Abstracts : Conference Abstract
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Corresponding author: Maja Zagmajster (maja.zagmajster@bf.uni-lj.si)
Received: 12 Oct 2018 | Published: 19 Oct 2018
© 2018 Petra Bregović, Cene Fišer, Maja Zagmajster
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Bregović P, Fišer C, Zagmajster M (2018) Contribution of range restricted and widespread species to biodiversity patterns in the Western Balkans in Southern Europe. ARPHA Conference Abstracts 1: e30500. https://doi.org/10.3897/aca.1.e30500
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Species richness patterns (SRP) emerge due to overlap in species distributions. They critically depend on two parameters of species ranges: geographic position and size. An important question is which species contribute more to the observed SRP, range restricted or widespread species. Most studies concluded that the widespread species tend to influence SRP more. However, the relative importance of either may strongly depend on the study system. Here we investigated how subterranean species of different range sizes contribute to SRP in the Western Balkans. We studied spatially defined datasets of terrestrial and aquatic troglobionts, represented by beetles (Cholevidae, Carabidae, 425 species) and amphipod crustaceans (Niphargidae, 150 species), respectively. The two groups differ in dispersal capacities, and indeed distribution of their range sizes differed. The proportion of single site species reached 30% in beetles, and 21% in niphargids. Maximum linear extent (MLE) of the range exceeded 200 km in only 1% of beetles, but in nearly 20% of niphargids. SRP of both taxonomic groups only partly overlapped. To assess the contribution of species with different ranges on SRP, we created different subsets and compared their SRPs with full dataset SRP. Subsets were first formed by adding species one-by-one, in ascending and descending order according to range size. We used correlation analysis, with significance assessed using null models generated from randomly generated subsets. In the second analysis, we assigned species info four classes according to range size, and modelled which size class best explains SRP. The results showed certain differences among the two taxonomic groups, which make generalizations difficult. We find it important to evaluate the contribution of species with different ranges to overall SRP, but also to identification of local hotspots.
Maja Zagmajster
24th International Conference on Subterranean Biology 2018, Aveiro, Portugal