Effects of a retaining wall and an artificial embankment on nearshore littoral habitats and biota in a large Alpine lake
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The littoral zones of many Central European lakes are severely altered by lake-side retaining walls. These are suspected to impair littoral biota due to the reflection of incoming wave energy. We conducted a comparative study (armoured shore with a retaining wall and a restored shore with a wedge-shaped cobble embankment vs. a pristine shore) at a wind-exposed shore section of Lake Constance. The retaining wall had a number of significant remote effects on the littoral zone, i.e. increased near-bottom current velocities, higher bed-load transport rates, coarsening of surface sediments, reduction in phytomass density, reduction in total densities and number of taxa of macroinvertebrates as well as a significant decline in the percentages of Limnomysis benedeni Czerniavsky, 1882, Ostracoda, Corbicula fluminea O.F. Müller, 1774, Dreissenapolymorpha (Pallas, 1771) and other Bivalvia. However, the significantly affected zone had a rather narrow width of ~ 3 m. Shore restoration measures are needed to remediate negative effects of retaining walls and re-establish ecological conditions that are comparable to those of pristine shores. We recommend a more site sensitive sampling strategy, e.g. for macroinvertebrates in context with the ecological quality assessment under the European Water Framework Directive.
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OSTENDORP, Wolfgang, Hilmar HOFMANN, Lisa TEUFEL, Oliver MILER, 2020. Effects of a retaining wall and an artificial embankment on nearshore littoral habitats and biota in a large Alpine lake. In: Hydrobiologia. Springer Science and Business Media. 2020, 847(2), pp. 365-389. ISSN 0018-8158. eISSN 1573-5117. Available under: doi: 10.1007/s10750-019-04099-8BibTex
@article{Ostendorp2020-01Effec-47664,
year={2020},
doi={10.1007/s10750-019-04099-8},
title={Effects of a retaining wall and an artificial embankment on nearshore littoral habitats and biota in a large Alpine lake},
number={2},
volume={847},
issn={0018-8158},
journal={Hydrobiologia},
pages={365--389},
author={Ostendorp, Wolfgang and Hofmann, Hilmar and Teufel, Lisa and Miler, Oliver}
}
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<dcterms:abstract xml:lang="eng">The littoral zones of many Central European lakes are severely altered by lake-side retaining walls. These are suspected to impair littoral biota due to the reflection of incoming wave energy. We conducted a comparative study (armoured shore with a retaining wall and a restored shore with a wedge-shaped cobble embankment vs. a pristine shore) at a wind-exposed shore section of Lake Constance. The retaining wall had a number of significant remote effects on the littoral zone, i.e. increased near-bottom current velocities, higher bed-load transport rates, coarsening of surface sediments, reduction in phytomass density, reduction in total densities and number of taxa of macroinvertebrates as well as a significant decline in the percentages of Limnomysis benedeni Czerniavsky, 1882, Ostracoda, Corbicula fluminea O.F. Müller, 1774, Dreissenapolymorpha (Pallas, 1771) and other Bivalvia. However, the significantly affected zone had a rather narrow width of ~ 3 m. Shore restoration measures are needed to remediate negative effects of retaining walls and re-establish ecological conditions that are comparable to those of pristine shores. We recommend a more site sensitive sampling strategy, e.g. for macroinvertebrates in context with the ecological quality assessment under the European Water Framework Directive.</dcterms:abstract>
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