Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments

Assessments of the ecological status of freshwater ecosystems, such as mandated by the EU Water Framework Directive, are routinely conducted by monitoring macroinvertebrates. However, for the quality assessment of fine sediments, macroinvertebrates are of limited suitability. In such habitats they s...

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Autores principales:	Henrike Brüchner-Hüttemann, Sebastian Höss, Christoph Ptatscheck, Marvin Brinke, Janina Schenk, Walter Traunspurger
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Macrofauna Meiofauna Nematodes Bioindicator Sediment quality Stream Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/62836c328d994150a3c26e153e6140b6
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spelling	oai:doaj.org-article:62836c328d994150a3c26e153e6140b62021-12-01T04:32:30ZAdded value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments1470-160X10.1016/j.ecolind.2020.107015https://doaj.org/article/62836c328d994150a3c26e153e6140b62021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20309547https://doaj.org/toc/1470-160XAssessments of the ecological status of freshwater ecosystems, such as mandated by the EU Water Framework Directive, are routinely conducted by monitoring macroinvertebrates. However, for the quality assessment of fine sediments, macroinvertebrates are of limited suitability. In such habitats they show a low species diversity and often low densities, whereas a more diverse meiofauna can be found. Among the meiofaunal groups in benthic habitats, nematodes are one of the most abundant and species-rich. Fine, cohesive sediments considerably contribute to many ecosystem services, but they are often hotspots of chemical contamination as well. In the present study, the added value of the recently developed and validated NemaSPEAR[%]-index was evaluated by directly comparing it to routinely used macrofauna-based indices. Macrofaunal and nematode communities were synchronously monitored at seven sites in six different streams. The results of a chemical analysis of sediment pollutants combined with sediment quality guidelines revealed widely diverging toxic potentials at the seven investigated locations. The seasonal robustness of the NemaSPEAR[%]-index compared with macrofauna-based indices was also determined, by additionally obtaining synchronous samples of macrofauna and nematodes over the course of one year at one of the seven sites, a reference stream with very low toxic potential.The NemaSPEAR[%] performed robustly despite seasonal variations in the nematode community in the sediment of the unpolluted stream. At the seven sampling sites, representing a pollution gradient, the NemaSPEAR[%]-index correlated well with the toxic potential of the sediments. By contrast, the macrofauna-based indices did not correlate significantly with either the toxic potential of the sediments or with the results of NemaSPEAR[%] at the seven sites. For many non– endobenthic macroinvertebrates, chemical exposure is mostly through the water phase, such that the toxic potential of the sediments will not necessarily be reflected directly by macrofaunal indices. Accordingly, identifying the stressors that contribute to degrading the ecological status of a water body requires the inclusion of methods that examine different types of stressors, targets, and exposure pathways. Our study shows that the NemaSPEAR[%]-index provides added value to routinely used macrofaunal-based indices.Henrike Brüchner-HüttemannSebastian HössChristoph PtatscheckMarvin BrinkeJanina SchenkWalter TraunspurgerElsevierarticleMacrofaunaMeiofaunaNematodesBioindicatorSediment qualityStreamEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107015- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Macrofauna Meiofauna Nematodes Bioindicator Sediment quality Stream Ecology QH540-549.5
spellingShingle	Macrofauna Meiofauna Nematodes Bioindicator Sediment quality Stream Ecology QH540-549.5 Henrike Brüchner-Hüttemann Sebastian Höss Christoph Ptatscheck Marvin Brinke Janina Schenk Walter Traunspurger Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments
description	Assessments of the ecological status of freshwater ecosystems, such as mandated by the EU Water Framework Directive, are routinely conducted by monitoring macroinvertebrates. However, for the quality assessment of fine sediments, macroinvertebrates are of limited suitability. In such habitats they show a low species diversity and often low densities, whereas a more diverse meiofauna can be found. Among the meiofaunal groups in benthic habitats, nematodes are one of the most abundant and species-rich. Fine, cohesive sediments considerably contribute to many ecosystem services, but they are often hotspots of chemical contamination as well. In the present study, the added value of the recently developed and validated NemaSPEAR[%]-index was evaluated by directly comparing it to routinely used macrofauna-based indices. Macrofaunal and nematode communities were synchronously monitored at seven sites in six different streams. The results of a chemical analysis of sediment pollutants combined with sediment quality guidelines revealed widely diverging toxic potentials at the seven investigated locations. The seasonal robustness of the NemaSPEAR[%]-index compared with macrofauna-based indices was also determined, by additionally obtaining synchronous samples of macrofauna and nematodes over the course of one year at one of the seven sites, a reference stream with very low toxic potential.The NemaSPEAR[%] performed robustly despite seasonal variations in the nematode community in the sediment of the unpolluted stream. At the seven sampling sites, representing a pollution gradient, the NemaSPEAR[%]-index correlated well with the toxic potential of the sediments. By contrast, the macrofauna-based indices did not correlate significantly with either the toxic potential of the sediments or with the results of NemaSPEAR[%] at the seven sites. For many non– endobenthic macroinvertebrates, chemical exposure is mostly through the water phase, such that the toxic potential of the sediments will not necessarily be reflected directly by macrofaunal indices. Accordingly, identifying the stressors that contribute to degrading the ecological status of a water body requires the inclusion of methods that examine different types of stressors, targets, and exposure pathways. Our study shows that the NemaSPEAR[%]-index provides added value to routinely used macrofaunal-based indices.
format	article
author	Henrike Brüchner-Hüttemann Sebastian Höss Christoph Ptatscheck Marvin Brinke Janina Schenk Walter Traunspurger
author_facet	Henrike Brüchner-Hüttemann Sebastian Höss Christoph Ptatscheck Marvin Brinke Janina Schenk Walter Traunspurger
author_sort	Henrike Brüchner-Hüttemann
title	Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments
title_short	Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments
title_full	Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments
title_fullStr	Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments
title_full_unstemmed	Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments
title_sort	added value of the nemaspear[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/62836c328d994150a3c26e153e6140b6
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Added value of the NemaSPEAR[%]-index to routinely used macrofauna-based indices for assessing the quality of freshwater sediments

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