Nitrogen isotope fractionation in a continuous culture system containing phytoplankton and blue mussels

MARINE POLLUTION BULLETIN

卷:150

Article

Pruell, Richard J.¹  Taplin, Bryan K.¹  Oczkowski, Autumn J.¹  Grear, Jason S.¹  Mendoza, Wilson G.^2,4  Pimenta, Adam R.¹  Hanson, Alana R.¹  Miller, Kenneth M.³ 

[1] US EPA, Off Res & Dev, Ctr Environm Measurement & Modeling, Atlantic Coastal Environm Sci Div, 27 Tarzwell Dr, Narragansett, RI 02882 USA

[2] Oak Ridge Associated Univ, Oak Ridge Inst Sci & Educ, 100 ORAU Way, Oak Ridge, TN 37830 USA

[3] Gen Dynam Informat Technol, 6361 Walker Lane,Suite 300, Alexandria, VA 22310 USA

[4] Broward Cty Environm Monitoring Lab, Environm Planning & Community Resilience Div, 3211 Coll Ave, Davie, FL 33314 USA

关键词: Nitrogen stable isotopes;    Fractionation;    Phytoplankton;    Blue mussels;   

DOI  :  10.1016/j.marpolbul.2019.110745

来源: Elsevier

【 摘 要 】

An experiment was conducted to examine the fractionation of nitrogen stable isotopes in a continuous culture system containing field collected estuarine phytoplankton and blue mussels, Mytilus edulis. Nitrate and phosphate were added to culture vessels at concentrations above ambient levels and nitrogen isotope ratios (delta N-15) were measured in particulate matter (PM) and blue mussels over the course of the 15-day experiment. The added nutrients resulted in large productivity and chlorophyll increases in the system. Study results indicate that rapid and significant nitrogen isotope fractionation can occur during incorporation by phytoplankton grown under conditions of excess dissolved inorganic nitrogen, as shown by delta N-15 values depleted by as much as 9 parts per thousand in PM from the higher nutrient treatments. These lower delta N-15 values were also reflected in mussels exposed to culture vessels effluents. Therefore, nitrogen concentration needs to be considered when using delta N-15 values in biota as indicators of anthropogenic nitrogen inputs.

【 授权许可】

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