کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4397745 | 1305904 | 2007 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Density of Monoporeia affinis and biogeochemistry in Baltic Sea sediments
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This study focused on effects from Monoporeia affinis reworking and ventilation activities on benthic fluxes and mineralization processes during a simulated bloom event. The importance of M. affinis density for benthic solute (O2, ΣNO2â + NO3â, NH4+ and HPO42â) fluxes and sediment reactivity (mobilization of NH4+ and HPO42â) following additions of organic material to the sediment surface was experimentally investigated using sediment-water and closed sediment (jar) incubations. Three different densities of M. affinis were used to resemble a low, medium and high density situation (1300, 2500 and 6400 ind. mâ 2, respectively) of a natural amphipod community. The degradation of phytodetritus (Tetraselmis sp., 5 g C mâ 2) added to the sediment surface was followed over a period of 20 days. Benthic solute fluxes of O2, ΣNO2â + NO3â and NH4+ were generally progressively stimulated with increasing number of M. affinis, while no such correlation was found for HPO42â. Solute fluxes were initially enhanced 1 to 2 days after the addition of phytodetritius, caused by mineralization of the most labile organic material and a food-stimulated irrigation by the amphipods. There was no effect from the activity of M. affinis on total denitrification (Dtot = Dn + Dw) or denitrification utilizing nitrate from coupled nitrification/denitrification (Dn) for any of the densities examined. Denitrification utilizing overlying water nitrate (Dw) was only about 10% of Dtot. Dw was significantly enhanced for the highest M. affinis density investigated. The reactivity of the sediment decreased progressively with increasing density of M. affinis and with time of the experiment. However, enhanced ammonium production at least 6 days after the organic addition indicated excretion of N-containing organic compounds by M. affinis. In conclusion, large spatial and temporal variations in density of M. affinis may be of significant importance for benthic solute fluxes and overall mineralization of organic material in Baltic Sea sediments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Experimental Marine Biology and Ecology - Volume 344, Issue 2, 15 June 2007, Pages 123-135
Journal: Journal of Experimental Marine Biology and Ecology - Volume 344, Issue 2, 15 June 2007, Pages 123-135
نویسندگان
Karin Karlson, Stefan Hulth, Rutger Rosenberg,