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      Composition, diversity and distribution of microbenthos across the intertidal zones of Ryazhkov Island (the White Sea).

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          Abstract

          The composition and distribution of the main unicellular eukaryotic groups (diatom algae, ciliates, dinoflagellates (DF), other phototrophic (PF) and heterotrophic flagellates (HF)) were investigated in sandy sediments at five stations allocated across the tidal sheltered beach of the White Sea. Overall, 75 diatoms, 98 ciliates, 16 DF, 3 PF and 34 HF species were identified; some are new records for the White Sea. Common species for each group are illustrated. Diatoms and ciliates showed high alpha-diversity (species richness per sample), whereas flagellates were characterized by high beta-diversity (species turnover across the intertidal flat). Each group demonstrated its own spatial pattern that was best matched with its own subset of abiotic variables, reflecting group-specific responses to environmental gradients. Species richness increased from the upper intertidal zone seaward for ciliates but decreased for HF, whereas autotrophs showed a relatively uniform pattern with a slight peak at the mid-intertidal zone. Across the littoral zone, all groups showed distinct compositional changes; however, the position of the boundary between "upper" and "lower" intertidal communities varied among groups. Most of the species found at Ryazhkov Island are known from many other regions worldwide, indicating a wide geographic distribution of microbial eukaryotic species.

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          Author and article information

          Journal
          Eur. J. Protistol.
          European journal of protistology
          Elsevier BV
          1618-0429
          0932-4739
          Nov 2013
          : 49
          : 4
          Affiliations
          [1 ] Department of Hydrobiology, Lomonosov Moscow State University, Moscow 119899, Russia. Electronic address: aiazovsky@mail.ru.
          Article
          S0932-4739(13)00048-5
          10.1016/j.ejop.2013.05.002
          23871644
          ec343287-bbd4-44b3-be34-bcef34ea4b75
          Copyright © 2013 Elsevier GmbH. All rights reserved.
          History

          Ciliates,Diatoms,Diversity,Flagellates,Microbenthos,White Sea
          Ciliates, Diatoms, Diversity, Flagellates, Microbenthos, White Sea

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