Results of 10 years sampling of Chironomidae from German lowland running waters differing in degradation

Based on data from monitoring in north-east Germany (Land Brandenburg) over a decade, chironomid taxa and their abundances were analysed for their preferences for certain running water types and degradation levels. A detrended correspondence analysis (DCA) revealed that the distribution of the taxa was determined by both, degradation level and water body type. A series of taxa was positively or negatively correlated to degradation, however, frequently only in certain water body types. In other types, they played no major role or were evenly distributed along the degradation gradient. Higher correlations were found for taxa favouring ‘good’ and 'poor' or 'bad' conditions than for preferers of ‘moderate’ status. The results allow to validate indices and weigths of indicators derived from high frequencies of the taxa in certain one or more quality class(es). The preferred ocurrencies elaborated have to be discussed or tested for plausiblity before using or evaluating powerful indicator taxa for classifications or revisions in assessment practice. A reduction of the taxonomical precision to genus level lowered the statistical significance and requires careful examination of the species preferences of the genus

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Invertebrate communities in soft sediments along a pollution gradient in a Mediterranean river (Llobregat, NE Spain)

Cesar Lopez-Doval J, Grossschartner M, Hoess S, et al. Invertebrate communities in soft sediments along a pollution gradient in a Mediterranean river (Llobregat, NE Spain). LIMNETICA. 2010;29(2):311-322.The Llobregat is a highly-perturbed Mediterranean river affected by a wide range of pollutants. High concentrations of soluble reactive phosphorus and chloride are the clearest indicators of pollution in this basin. Seven sites in the mid and lower Llobregat basin were sampled in June 2005 to examine the invertebrate community inhabiting the soft sediments along this pollution gradient. Spatial distribution analysis revealed differences in chemical parameters, and in the composition and biomass of the invertebrate community. Most of the taxa found are opportunistic and reflect low or unacceptable biological water quality. Nevertheless, changes in their abundance, biomass and diversity reflect the longitudinal pollution gradient in the river

Invertebrate communities in soft sediments along a pollution gradient in a Mediterranean river (Llobregat, NE Spain)

ABSTRACT Invertebrate communities in soft sediments along a pollution gradient in a Mediterranean river (Llobregat, NE Spain) The Llobregat is a highly-perturbed Mediterranean river affected by a wide range of pollutants. High concentrations of soluble reactive phosphorus and chloride are the clearest indicators of pollution in this basin. Seven sites in the mid and lower Llobregat basin were sampled in June 2005 to examine the invertebrate community inhabiting the soft sediments along this pollution gradient. Spatial distribution analysis revealed differences in chemical parameters, and in the composition and biomass of the invertebrate community. Most of the taxa found are opportunistic and reƀect low or unacceptable biological water quality. Nevertheless, changes in their abundance, biomass and diversity reƀect the longitudinal pollution gradient in the river. Key words: Llobregat river, soft sediment, pollution gradient, invertebrates, multivariate analysis. RESUMEN Comunidades de invertebrados en sedimentos a lo largo de un gradiente de contaminació

An annotated checklist of macrozoobenthic species in German waters of the North and Baltic Seas

Abstract The present compilation is the first attempt to generate a comprehensive list of all macrozoobenthic species recorded at least once in the German regions of the North Sea and Baltic Sea including non-indigenous species and freshwater species which occurred in brackish waters (estuaries, bays, fjords etc.). Based on the data of several research institutes and consultancies, the macrozoobenthic species inventory comprises a total of 1.866 species belonging to 16 phyla including 193 threatened species. The most common groups were: malacostracan crustaceans (21%), Polychaeta (19%), and Gastropoda (12%). Even though the two major marine regions are separated by only 50 km of land, the composition of the respective communities was different. The two seas shared only 36.6% of the recorded species which should have profound and far-reaching consequences for conservation purposes. Considering all macroinvertebrates listed 96 species, or the equivalent of 5.2%, were introduced mainly during the last two centuries. Both seas are heavily affected by human activities and are sensitive to climate change displayed by effects on the faunal compositions. The present checklist is an important step to document these changes scientifically and may act as a base for political and management decisions

MOESM1 of An annotated checklist of macrozoobenthic species in German waters of the North and Baltic Seas

Additional file 1. Checklist (data table) of all macrozoobenthic species occurring in the investigation area (North Sea, Baltic Sea)