کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4396576 | 1618469 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diatom derived dissolved organic matter as a driver of bacterial productivity: The role of nutrient limitation
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
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چکیده انگلیسی
Variable inorganic nutrient concentrations were used to generate silicate (Si) or nitrogen (N) limited conditions in cultures of the marine diatom Skeletonema costatum. Dissolved organic matter (DOM) harvested in the nutrient limited phase of these cultures was added to a natural bacterial community. Enhanced bacterial abundance and bacterial production were observed, in comparison to un-supplemented controls, when Si-limited (Si-DOM) rather than N-limited (N-DOM) diatom derived DOM or inorganic nutrients was added. This indicates that the bacterial population was limited by organic rather than inorganic resources but only Si-DOM had sufficient lability to alleviate this. Within the bacterial assemblage, a notable increase in the proportion of γ-Proteobacteria was evident on receipt of only Si-DOM. Assessment of the composition of the added DOM suggested that the observed dynamics were related to organic matter composition rather than molecular size as, within the Si- and N-DOM, the proportions of low and high molecular weight compounds were similar, but the polysaccharide and protein signatures were different.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Experimental Marine Biology and Ecology - Volume 391, Issues 1â2, 15 August 2010, Pages 20-26
Journal: Journal of Experimental Marine Biology and Ecology - Volume 391, Issues 1â2, 15 August 2010, Pages 20-26
نویسندگان
Romain Pete, Keith Davidson, Mark C. Hart, Tony Gutierrez, Axel E.J. Miller,