Macrobenthic community response to the Marenzelleria viridis (Polychaeta) invasion of a Danish estuary

Marine Ecology Progress Series

Gil Penha-Lopes¹  Thomas Valdemarsen¹  Matthieu Delefosse¹  Erik Kristensen¹  Gary T. Banta¹  Paula Canal-Verg#xe9s¹  Cintia O. Quintana¹ 

关键词: Invasive species;    Marenzelleria viridis;    Nereis (Hediste) diversicolor;    Arenicola marina;    Benthic communities;    Biological interactions;    Polychaetes;    Regime shift;   

DOI  :  10.3354/meps09821

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: We investigated the invasion of the non-native polychaete Marenzelleria viridis in a shallow Danish estuary, Odense Fjord. Three datasets with different spatial and temporal resolution were examined to describe the invasion of M. viridis and to investigate its effect on the native benthic community with focus on the 2 common polychaetes, Nereis (Hediste) diversicolor and Arenicola marina. Marenzelleria viridis colonized Odense Fjord rapidly, and within 3 yr it had spread to ~50% of the estuary. The population development of M. viridis in Odense Fjord followed the ‘boom-bust’ pattern that is typical for many invaders. M. viridis is now firmly established and has reached an overall abundance of 100 to 200 individuals (ind.) m⁻² with 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 between M. viridis and the native A. marina. Otherwise the introduction of M. viridis was synchronous with a decrease of several macroinvertebrates species, especially N. diversicolor. The latter is still the dominant species in Odense Fjord, but its density has decreased by >60% in areas colonised by M. viridis. We do not expect that N. diversicolor disappears completely in this estuary, but it will probably be displaced to refuge areas where M. viridis cannot survive. Decrease in the population size of a key native species such as N. diversicolor might have significant ecological implications at the ecosystem level with respect to biodiversity and nutrient cycling.

【 授权许可】

Unknown