Meiofaunal and bacterial community response to diesel additions in a microcosm study

作者：Lindgren J Fredrik^*; Hassellov Ida Maja; Dahllof Ingela

来源：Marine Pollution Bulletin, 2012, 64(3): 595-601.

DOI：10.1016/j.marpolbul.2011.12.014

• Community response
• Meiofauna
• Bacteria
• PAH
• Nutrient fluxes
• Non-lethal effects

Effects of low PAR-containing diesel were studied in a 60-day microcosm experiment at PAH concentrations 130, 1300 and 13,000 mu g/kg sediment. Nutrient fluxes, potential nitrification and meiofaunal community composition were analysed at three time points. Changed Sigma NOx-fluxes indicated reduced sediment nitrification in Medium and High with time, in agreement with lowered potential nitrification rates in all treatments. Reduction in silicate and phosphate fluxes over time suggested severe effects on activity of meiofauna. Reduced activity increased the anoxic sediment layer, which could have contributed to the changed Sigma NOx-fluxes. There were significant differences in meiofaunal community composition after 30 and 60 days in Medium and High. Changes were due to increasing numbers of harpacticoids and the foraminiferan group Rotaliina, as well as decreasing numbers of Nematodes and the foraminiferan group Reophax. In spite of the low PAH-level, small additions of this diesel can still have pronounced effects on meiofaunal and bacterial communities.

• 出版日期2012-3