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                                <gco:CharacterString>Bericht: "Langzeitveränderungen des eulitoralen Makrozoobenthos im Mesohalinikum der Wesermündung"</gco:CharacterString>
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                                        <gco:CharacterString>Kolbe, K., Michaelis, H., Jaklin, S. (2004): Langzeitveränderungen
des eulitoralen Makrozoobenthos im Mesohalinikum der Wesermündung
Berichte der Forschungsstelle Küste Band 42; Norderney
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                        <gco:CharacterString>In die Wesermündung werden seit 1969 Abwässer aus einer 
Titandioxidfabrik eingeleitet. Im Rahmen eines Überwachungsprogrammes wurden die langfristigen Veränderungen 
des eulitoralen Benthos im mesohalinen Abschnitt des Ästuars anhand von Kartierungsdaten der Jahre 1968, 1980 und 1992 
untersucht. Mit Hilfe von Clusteranalysen konnten acht Benthos-Assoziationen definiert und beschrieben werden, deren Anzahl sich 
von 1968 (7) bis 1992 (3) verringerte. Dieser Verlust an Vielfalt von Gemeinschaften dürfte auf einen Verlust an Umweltqualität 
hindeuten, ohne dass die direkten Ursachen genannt werden könnten. Parallel dazu hatten sich Verbreitungsareale vieler Arten 
wie auch der gesamten Benthosbiozönose stromaufwärts verlagert, was auf den langfristigen Anstieg der Salinität zurück-zuführen ist. 
Als besonders auffällige Veränderungen sind zu nennen: 1) ein starker Rückgang der Brackwasseralge Vaucheria sp., nachweislich 
nicht durch Abwässer aus der TiO2-Produktion verursacht, und 2) eine Etablierung des Polychaeten Marenzelleria c.f. wireni seit 
1986, der im Laufe der 80er Jahre in viele Ästuare der südlichen Nordsee eingewandert ist. Since 1969, the Weser estuary is recipient of wastewater from a 
titanium-dioxide factory. In the framework of environmental control investigations, the long-term changes of intertidal benthic 
assemblages in the mesohalinic section of the estuary have been studied by a comparison of survey data from 1968, 1980 and 1992.
By means of cluster-analysis eight benthos assemblages could be identified and described, the number of which declined from 1968 
(7) through 1992 (3). This loss of assemblage diversities 
presumably indicates an environmental deterioration without direct 
reasons being recognisable. It was accompanied by a shift of 
individual species distribution and of the whole estuarine benthic 
community in the upstream direction which clearly is induced by a 
long-term increase of salinity. Two of the most conspicuous changes were 1) A strong decrease of the brackishwater algae 
Vaucheria sp. in the period 1968 to 1980 which, as could be ascertained, was not an effect of the wastes from TiO2-production,
 and 2) an immigration of the polychaete Marenzelleria c.f. wireni since 1986, which is a new species in many estuaries of the 
southern North Sea.</gco:CharacterString>
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