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Hydrochemical and microbiological distinction and function of ombrotrophic peatland lagg as ecotone between Sphagnum peatland and forest catchment (Poleski National Park, eastern Poland)

Published online by Cambridge University Press:  06 August 2012

Tomasz Mieczan ,
Monika Tarkowska-Kukuryk  and
Irena Bielańska-Grajner
Tomasz Mieczan*
Affiliation:
Department of Hydrobiology, University of Life Sciences, Dobrzańskiego 37, 20-262 Lublin, Poland
Monika Tarkowska-Kukuryk
Affiliation:
Department of Hydrobiology, University of Life Sciences, Dobrzańskiego 37, 20-262 Lublin, Poland
Irena Bielańska-Grajner
Affiliation:
Department of Hydrobiology, University of Silesia, Bankowa 9, 40-007 Katowice, Poland
*
*Corresponding author: tomasz.mieczan@up.lublin.pl
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Abstract

The testate amoeba, ciliate and rotifera communities living in interstitial waters in peatbog in eastern Poland were studied. Sampling was done on a monthly basis from April to November 2007–2008. Microbial communities were examined in a transect including three sites: (1) pine forest (site located 5 m from the lagg/forest contact zone), (2) lagg, (3) open peatbog (the centre of the peatbog). At each of the sites, interstitial water was sampled by means of piezometric wells placed to a depth of 1 m. The species richness and abundance of protozoa and rotifers significantly differed between the studied stations, with the lowest numbers in the pine forest and the highest in the lagg. These differences between macro-habitats may be due to differences in environmental conditions. The distribution of samples in ordination space led to conclude that studied habitats are distributed along the falling gradient of pH and rising gradient of total organic carbon, water table depth and nitrate nitrogen. Assemblages of all three groups showed a strong compositional gradient correlated with water-table depth, conductivity and total phosphorus. However, species composition of ciliates and rotifers was explained by nitrate nitrogen and/or phosphates concentrations. The results suggest that lagg zone of a raised bog can fulfil the function of an ecotone zone, distinguished by a significant increase in biodiversity, abundance and species specificity of micro-organisms. It can also be a place of very efficient matter and energy flow in a peat bog ecosystem.

Keywords

peatlandslaggecotonetestate amoebaeciliatesrotifers
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 48 , Issue 3 , 2012 , pp. 323 - 336
Copyright
© EDP Sciences, 2012

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