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Environmental monitoring in Baden-Württemberg with special reference to biocoenotic trend-monitoring of macrozoobenthos in rivers and methodical requirements for evaluation of long-term biocoenotic changes
Marten, M. (2001). Environmental monitoring in Baden-Württemberg with special reference to biocoenotic trend-monitoring of macrozoobenthos in rivers and methodical requirements for evaluation of long-term biocoenotic changes. Aquat. Ecol. 35(2): 159-171
In: Aquatic Ecology. Springer: Dordrecht; London; Boston. ISSN 1386-2588, more
Peer reviewed article  

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Keyword
    Fresh water

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  • Marten, M.

Abstract
    Biomonitoring methods from a comprehensive study of man-made impacts on urban and on the near-natural environment are presented. Part of the environmental monitoring in Baden-Württemberg is a biocoenotic trend-monitoring project on macrozoobenthos in running waters which has resulted in a database enabling long-term trend assessment of biocoenosis in diverse rivers and streams in the future. About 561 species of macrozoobenthos have been recorded (21 species for the first time in Baden-Württemberg). Data are analysed for different purposes: methodological requirements for aquatic trendbiomonitoring, status of endangerment according to the Red Data Book, and first assessment of faunistic long-term changes in the River Rhine.Calculation of cumulative species numbers over number of samples offers sampling success and therefore represents a good way to show how sure or complete results of a given faunistic approach are at a given time. One sample provides less than 25% of the fauna recorded within a three years period of quarterly inspections. To collect the main fraction (90%) of species, it takes 3 years of quarterly collections if all species recorded only once during the whole period are neglected. Several rare species were recorded within the project. 34% of mayflies, stoneflies and caddisflies are endangered.The River Rhine and its changes in faunal composition within the last century is the example to illustrate the principle of biocoenotic trend-monitoring. The more recent samples of the macrobenthic fauna of the River Rhine indicate an improved quality and diversity because of improved water quality. Several species, indicative of good water quality have returned, and invasion of neozoans is still high, too. However, with respect to extinct species of macrozoobenthos, especially stoneflies, mayflies and caddisflies, mentioned by former authors, there is still a marked absence of indigenous species in the River Rhine.

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