Differential Response of Aquatic Oligochaete Species to Increased Nutrient Availability – a Comparative Study between Estonian and Dutch Raised Bogs |
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Authors: | G A van Duinen T Timm A J P Smolders A M T Brock W C E P Verberk H Esselink |
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Institution: | (1) Bargerveen Foundation, Radboud University Nijmegen, P.O. Box 9010, 6500, GL, Nijmegen, The Netherlands;(2) Department of Environmental Science, Institute for Water and Wetland Research, Radboud University Nijmegen, P.O. Box 9010, 6500, GL, Nijmegen, The Netherlands;(3) Estonian University of Life Sciences, Centre for Limnology, 61101 Rannu, Tartumaa, Estonia;(4) Department of Animal Ecology and Ecophysiology, Institute for Water and Wetland Research, Radboud University Nijmegen, P.O. Box 9010, 6500, GL, Nijmegen, The Netherlands;(5) Department of Aquatic Ecology and Environmental Biology, Institute for Water and Wetland Research, Radboud University Nijmegen, P.O. Box 9010, 6500, GL, Nijmegen, The Netherlands |
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Abstract: | To assess the effects of increased nutrient availability on aquatic oligochaetes in raised bogs, species assemblages were
compared within and between fairly pristine raised bogs in Estonia and raised bog remnants in The Netherlands. Within the
pristine bog landscape a distinct pattern in the species assemblage is present. In the most nutrient-poor water bodies, in
the ombrotrophic raised bog, only the fragmenting, almost never mature, acid-tolerant species Cognettia sphagnetorum is present. In pristine Estonian raised bogs Nais variabilis, Lumbriculus variegatus and sexually reproducing species are limited to more minerotrophic water bodies, which have a higher decomposition rate of
dead organic matter and, consequently, higher nutrient availability. With ten species the lagg zone is the most species-rich
part of a pristine raised bog landscape. Most of these lagg zone species are not present in Dutch bog remnants as this part
of the bog landscape has long been cultivated. Nais variabilis occurs in the Dutch bog remnants much more frequently than in Estonian bogs, whereas the frequency of C. sphagnetorum and L. variegatus is similar between both countries. These three species respond differently to the increased nutrient availability in The
Netherlands, which could be linked to differences in their diets. In contrast to pristine bog pools, N. variabilis in Dutch raised bog remnants is present in water bodies not influenced by minerotrophic water. In Dutch raised bog remnants
the occurrence of oligochaetes is not limited anymore by nutrient availability, due to the higher atmospheric nitrogen and
sulphur loads in The Netherlands. Overall, it can be concluded that the degradation of Dutch raised bogs has resulted in the
loss of both the nutrient-poor parts of the landscape and the special lagg conditions. |
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Keywords: | oligochaeta nitrogen phosphorus sulphur deposition algae detritus organic matter peat decomposition |
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