Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-18224
Title: Species–area relationships in continuous vegetation : Evidence from Palaearctic grasslands
Authors : Dengler, Jürgen
Matthews, Thomas J.
Steinbauer, Manuel J.
Wolfrum, Sebastian
Boch, Steffen
Chiarucci, Alessandro
Conradi, Timo
Dembicz, Iwona
et. al : Yes
Published in : Journal of Biogeography
Publisher / Ed. Institution : Wiley
Issue Date: 19-Sep-2019
License (according to publishing contract) : CC BY 4.0: Attribution 4.0 International
Type of review: Peer review (publication)
Language : English
Subjects : Species-area relationship; Grassland
Subject (DDC) : 577: Ecology
Abstract: Aim: Species-area relationships (SARs) are fundamental scaling laws in ecology although their shape is still disputed. At larger areas power laws best represent SARs. Yet, it remains unclear whether SARs follow other shapes at finer spatial grains in continuous vegetation. We asked which function describes SARs best at small grains and explored how sampling methodology or the environment influence SAR shape. Location: Palaearctic grasslands and other non-forested habitats. Taxa: Vascular plants, bryophytes and lichens. Methods: We used the GrassPlot database, containing standardised vegetation-plot data from vascular plants, bryophytes, and lichens spanning a wide range of grassland types throughout the Palaearctic and including 2057 nested-plot series with at least seven grain sizes ranging from 1 cm2 to 1024 m². Using non-linear regression, we assessed the appropriateness of different SAR functions (power, power quadratic, power breakpoint, logarithmic, Michaelis-Menten). Based on AICc, we tested whether the ranking of functions differed among taxa, methodological settings, biomes or vegetation types. Results: The power function was the most suitable function across the studied taxonomic groups. The superiority of this function increased from lichens to bryophytes to vascular plants to all three taxonomic groups together. The sampling method was highly influential as rooted-presence sampling decreased the performance of the power function. By contrast, biome and vegetation type had practically no influence on the superiority of the power law. Main conclusions: We conclude that SARs of sessile organisms at smaller spatial grains are best approximated by a power function. This coincides with several other comprehensive studies of SARs at different grain sizes and for different taxa, thus supporting the general appropriateness of the power function for modelling species diversity over a wide range of grain sizes. The poor performance of the Michaelis-Menten function demonstrates that richness within plant communities generally does not approach any saturation, thus calling into question the concept of minimal area.
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Publication type: Article in scientific journal
DOI : 10.1111/jbi.13697
10.21256/zhaw-18224
ISSN: 0305-0270
1365-2699
URI: https://digitalcollection.zhaw.ch/handle/11475/18224
Appears in Collections:Publikationen Life Sciences und Facility Management

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