Please use this identifier to cite or link to this item:

Title: Environmental filtering and limiting similarity as main forces driving diatom community structure in Mediterranean and continental temporary and perennial streams
Authors: Várbíró, Gábor
Borics, Gábor
Novais, Maria Helena
Morais, Maria Manuela
Rimet, Frédéric
Bouchez, Agnès
Tapolczai, Kálmán
Bácsi, István
Usseglio-Polatera, Philippe
B-Béres, Viktória
Editors: Sabater, Sergi
Keywords: Temporary streams
Mediterranean and continental regions
Limiting similarity
Environmental filtering
Issue Date: 23-Jun-2020
Publisher: Elsevier
Citation: Várbíró G., Borics G., Novais M.H., Morais M.M., Rimet F., Bouchez A., Tapolczai K., Bácsi I., Usseglio-Polatera P. & V. B-Béres (2020). Environmental filtering and limiting similarity as main forces driving diatom community structure in Mediterranean and continental temporary and perennial streams. Science of the Total Environment 741: 140459
Abstract: Climatic extreme events such as droughts (unpredictable), dry periods (predictable) or even flush floods, threaten freshwater ecosystemsworldwide. The filtering mechanisms of these events and their strength on communities, however, can be different among regions. While time-for-adaptation theory defines whether or not water scarcity can be considered as disturbance, the stress-dominance theory predicts an increase in importance of environmental filtering and a decrease in the role of biotic interactions in communities with increasing environmental stress. Here, we testedwhether environmental filtering (leading to trait convergence) or limiting similarity (leading to trait divergence) is the main assembly rule shaping the structure and trait composition of benthic diatom assemblages in Mediterranean (Portuguese) and continental (Hungarian) temporary and perennial streams.We assumed that the trait composition of diatomassemblages in the two stream typeswould be less different in the Mediterranean than in the continental region (addressed to time-for-adaptation theory). We also hypothesized that trait composition would be shaped by environmental filtering in the Hungarian streams while by biotic interactions in Portuguese streams (addressed to stress-dominance theory). Our results supported our first hypothesis since traits, which associated primarily to temporary streams were found only in the continental region. Our findings, however, only partially proved the stress-dominance hypothesis. In the continental region,where drying up of streamswere induced by unpredictable droughts, biotic interactionswere the main assembly rules shaping community structure. In contrast, environmental filtering was nearly as important as limiting similarity in structuring trait composition in the Mediterranean region during the predictable dry phasewith no superficial flow. These analyses also highlighted that drought events (both predictable and unpredictable ones) have a complex and strong influence on benthic diatom assemblages resulting even in irreversible changes in trait composition and thereby in ecosystem functioning.
Type: article
Appears in Collections:ICT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

Files in This Item:

File Description SizeFormat
Varbiro et al 2020 STOTEN 741 140459_Environmental filtering and limiting similarity as main forces.pdf2.46 MBAdobe PDFView/Open
FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpaceOrkut
Formato BibTex mendeley Endnote Logotipo do DeGóis 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Dspace Dspace
DSpace Software, version 1.6.2 Copyright © 2002-2008 MIT and Hewlett-Packard - Feedback
UEvora B-On Curriculum DeGois