High diatom species turnover in a Baltic Sea rock pool metacommunity

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http://hdl.handle.net/10138/309092

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Aarnio , S , Teittinen , A & Soininen , J 2019 , ' High diatom species turnover in a Baltic Sea rock pool metacommunity ' , Marine Biodiversity , vol. 49 , no. 6 , pp. 2887-2899 . https://doi.org/10.1007/s12526-019-01016-z

Title: High diatom species turnover in a Baltic Sea rock pool metacommunity
Author: Aarnio, Sonja; Teittinen, Anette; Soininen, Janne
Other contributor: University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Geosciences and Geography
Date: 2019-12
Language: eng
Number of pages: 13
Belongs to series: Marine Biodiversity
ISSN: 1867-1616
DOI: https://doi.org/10.1007/s12526-019-01016-z
URI: http://hdl.handle.net/10138/309092
Abstract: Different metacommunity perspectives have been developed to describe the relationship between environmental and spatial factors and their relative roles for local communities. However, only little is known about temporal variation in metacommunities and their underlying drivers. We examined temporal variation in the relative roles of environmental and spatial factors for diatom community composition among brackish-watered rock pools on the Baltic Sea coast over a 3-month period. We used a combination of direct ordination, variation partition, and Mantel tests to investigate the metacommunity patterns. The studied communities housed a mixture of freshwater, brackish, and marine species, with a decreasing share of salinity tolerant species along both temporal and spatial gradients. The community composition was explained by both environmental and spatial variables (especially conductivity and distance from the sea) in each month; the joint effect of these factors was consistently larger than the pure effects of either variable group. Community similarity was related to both environmental and spatial distance between the pools even when the other variable group was controlled for. The relative influence of environmental factors increased with time, accounting for the largest share of the variation in species composition and distance decay of similarity in July. Metacommunity organization in the studied rock pools was probably largely explained by a combination of species sorting and mass effect given the small spatial study scale. The found strong distance decay of community similarity indicates spatially highly heterogeneous diatom communities mainly driven by temporally varying conductivity gradient at the marine-freshwater transition zone.
Subject: Brackish
Conductivity
Mass effect
Microbial
Species sorting
Temporal
COMMUNITY STRUCTURE
RELATIVE IMPORTANCE
DISTURBANCE REGIME
BETA-DIVERSITY
MODEL SYSTEMS
DISPERSAL
MICROORGANISMS
BIOGEOGRAPHY
NICHE
INVERTEBRATE
1171 Geosciences
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