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Macrobenthic community response to theMarenzelleria viridis(Polychaeta) invasion of a Danish estuary
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Macrobenthic community response to theMarenzelleria viridis(Polychaeta) invasion of a Danish estuary
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Macrobenthic community response to theMarenzelleria viridis(Polychaeta) invasion of a Danish estuary
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Journal Article
Macrobenthic community response to theMarenzelleria viridis(Polychaeta) invasion of a Danish estuary
2012
Overview
We investigated the invasion of the non-native polychaeteMarenzelleria viridisin a shallow Danish estuary, Odense Fjord. Three datasets with different spatial and temporal resolution were examined to describe the invasion ofM. viridisand to investigate its effect on the native benthic community with focus on the 2 common polychaetes,Nereis (Hediste) diversicolorandArenicola marina.Marenzelleria viridiscolonized Odense Fjord rapidly, and within 3 yr it had spread to ~50% of the estuary. The population development ofM. viridisin Odense Fjord followed the ‘boom-bust’ pattern that is typical for many invaders.M. viridisis now firmly established and has reached an overall abundance of 100 to 200 individuals (ind.) m−2with local maxima of up to 1200 ind. m−2. Its distribution is apparently regulated by abiotic parameters that prevent its establishment in the oligohaline and more silty parts of Odense Fjord. There was a positive interaction betweenM. viridisand the nativeA. marina. Otherwise the introduction ofM. viridiswas synchronous with a decrease of several macroinvertebrates species, especiallyN. diversicolor. The latter is still the dominant species in Odense Fjord, but its density has decreased by >60% in areas colonised byM. viridis. We do not expect thatN. diversicolordisappears completely in this estuary, but it will probably be displaced to refuge areas whereM. viridiscannot survive. Decrease in the population size of a key native species such asN. diversicolormight have significant ecological implications at the eco system level with respect to biodiversity and nutrient cycling.
Publisher
Inter-Research
Subject
