Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Drivers of plant diversity in Bulgarian dry grasslands vary across spatial scales and functional‐taxonomic groups
Authors: Dembicz, Iwona
Velev, Nikolay
Boch, Steffen
Janišová, Monika
Palpurina, Salza
Pedashenko, Hristo
Vassilev, Kiril
Dengler, Jürgen
et. al: No
DOI: 10.1111/jvs.12935
Published in: Journal of Vegetation Science
Issue Date: Sep-2020
Publisher / Ed. Institution: Wiley
ISSN: 1100-9233
1654-1103
Language: English
Subjects: Alpha‐diversity; Beta diversity; Bryophyte; Diversity–environment relationship; Dry grassland; Lichen; Nested plot; Raunkiaer life form; Scale dependence; Species richness; Species–area relationship; Vascular plant
Subject (DDC): 577: Ecology
580: Plants (Botany)
Abstract: Questions: Studying dry grasslands in a previously unexplored region, we asked: (a) which environmental factors drive the diversity patterns in vegetation; (b) are taxonomic groups (vascular plants, bryophytes, lichens) and functional vascular plant groups differently affected; and (c) how is fine-grain beta diversity affected by environmental drivers? Location: Northwestern and Central Bulgaria. Methods: We sampled environmental data and vascular plant, terricolous bryophyte and lichen species in 97 10-m2 plots and 15 nested-plot series with seven grain sizes (0.0001–100 m2) of ten grassland sites within the two regions. We used species richness as measure of alpha-diversity and the z-value of the power-law species–area relationship as measure of beta-diversity. We analysed effects of landscape, topographic, soil and land-use variables on the species richness of the different taxonomic and functional groups. We applied generalised linear models (GLMs) or, in the presence of spatial autocorrelation, generalised linear mixed-effect models (GLMMs) in a multi-model inference framework. Results: The main factors affecting total and vascular plant species richness in 10-m2 plots were soil pH (unimodal) and inclination (negative). Species richness of bryophytes was positively affected by rock cover, sand proportion and negatively by inclination. Inclination and litter cover were also negative predictors of lichen species richness. Elevation negatively affected phanerophyte and therophyte richness, but positively that of cryptophytes. A major part of unexplained variance in species richness was associated with the grassland site. The z-values for total richness showed a positive relationship with elevation and inclination. Conclusions: Environmental factors shaping richness patterns strongly differed among taxonomic groups, functional vascular plant groups and spatial scales. The disparities between our and previous findings suggest that many drivers of biodiversity cannot be generalised but rather depend on the regional context. The large unexplained variance at the site level calls for considering more site-related factors such as land-use history.
URI: https://digitalcollection.zhaw.ch/handle/11475/20532
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Appears in Collections:Publikationen Life Sciences und Facility Management

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