Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 341455
Title Analyzing the causes for the persistence of chironomids in flood plain lake sediments
Author(s) Haas, E.M. de; Haaren, R. van; Koelmans, A.A.; Kraak, M.H.S.; Admiraal, W.
Source Archiv für Hydrobiologie 162 (2005)2. - ISSN 0003-9136 - p. 211 - 228.
Department(s) Aquatic Ecology and Water Quality Management
Publication type Refereed Article in a scientific journal
Publication year 2005
Keyword(s) sediment - verontreinigende stoffen - chironomus riparius - benthos - waterverontreiniging - stroomvlakten - zware metalen - meren - biotesten - nederland - ecotoxicologie - waterbodems - rijn - waal - sediment - pollutants - chironomus riparius - benthos - water pollution - floodplains - heavy metals - lakes - bioassays - netherlands - ecotoxicology - water bottoms - river rhine - river waal - quality triad approach - benthic invertebrates - community composition - marine sediment - riparius larvae - toxicity - diptera - river - deformation
Categories Aquatic Ecology / Environmental Toxicology, Ecotoxicology
Abstract The aim of the present study was to analyse the causes for the absence and persistence of chironomids in sediments with a complex pollution history. Observations on the benthic community composition in floodplain lake sediments of the River Rhine, differing in contaminant level and food quality, were combined with laboratory and in situ bioassays, using the midge Chironomus riparius as a model species. The positive relation between food quality and the diversity of the communities indicated that food quality is an important factor regulating benthic community composition, overriding the potential effects of contaminants. Nevertheless, in sediments with high contaminant levels, high densities of species classified as 'pollution-tolerant', such as Chironomus sp., were observed. The laboratory bioassays verified that the contaminant concentrations in these sediments had no direct effect on survival and growth of C. riparius, although higher contaminant concentrations in the sediment resulted in a higher incidence of mentum deformities. Also, the high growth rate of C. riparius in the in situ enclosures in two of the most contaminated sediments indicated chemical stress and mentum deformities did not exclude rapid growth. This observation agrees with the abundance of the resident pollution-tolerant chironomids of the Chironomus plumosus group. In addition, the in situ bioassay pointed out that predation on chironomids added to the field enclosures was significant and is also an important factor in regulating the abundance of chironomids. In sediments with the highest food quality and low levels of contaminants the opportunistic chironomids may have been outcompeted by benthic invertebrate taxa that are not able to persist at more contaminated sites. It is concluded that tolerance of opportunistic chironomids, such as Chironomus sp., combined with their rapid rate of development, enables them to persist in contaminated sediments that are organically enriched avoiding competition with other invertebrates
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