Assessment of biogeochemical changes in the sediments of the Eastern part of the Gulf of Finland due to invasion of polychaetes Marenzelleria spp. on evidence from observation data and modeling results
Abstract
Species Marenzelleria spp. that invaded the Baltic Sea for several years became a leader of significant biogeochemical changes in the sediments that affect cycles of nutrients, nitrogen and phosphorus, that play a major role in eutrophication. Field observations of pore water and solid phase of the sediments were held in the Eastern part of the Gulf of Finland for assess changes of biogeochemical processes due to polychaetes invasion. For the projection of possible future changes as a consequence of Marenzelleria spp. impact, diagenetic model CANDI (carbon and nutrient diagenesis) is used. The simulation results show that in 5 years there might be lower stores of phosphates (in 2.6 times), ammonium (1.6 times), as well as higher stores of sulphate (1.5 times) in pore water and iron in the sediments (7 times) on the station with high abundance of polychaetes compared to the station with low density of Marenzelleria spp. The stores of nitrates in two stations are practically the same. Concluded, that in conditions of high and low abundance of invasive species different mechanisms are working in the ecosystems.
About the Authors
T. R. Eremina
Russian State Hydrometeorological University
Russian Federation
Russian Federation
E. V. Voloshchuk
Russian State Hydrometeorological University
Russian Federation
Russian Federation
A. A. Maximov
Zoological Institute of Russian Academy of Sciences
Russian Federation
Russian Federation
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Review
For citations:
Eremina T.R., Voloshchuk E.V., Maximov A.A. Assessment of biogeochemical changes in the sediments of the Eastern part of the Gulf of Finland due to invasion of polychaetes Marenzelleria spp. on evidence from observation data and modeling results. Proceedings of the Russian Geographical Society. 2016;148(1):55-71. (In Russ.)
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