کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4528401 | 1324305 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of UV radiation and nitrate limitation on the production of biogenic sulfur compounds by marine phytoplankton
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We tested the effects of UV radiation (UVR) and nitrate limitation on the production of dimethylsulfide (DMS), particulate dimethylsulfoniopropionate (DMSPp), and particulate dimethylsulfoxide (DMSOp) in natural seawater from the Gulf of Mexico and in phytoplankton cultures. DMS/Chl a ratios in PAR-only and PAR + UV-exposed seawater were 0.44-2.0 and 0.46-1.9 nmol DMS μgâ1 Chl a, respectively, whereas the ratios in cultures of Amphidinium carterae were 1.0-2.2 nmol μgâ1 in PAR-exposed samples and 0.91-2.1 nmol μgâ1 in PAR + UV-exposed samples. These results suggested that UVR did not substantially affect DMS/Chl a ratios in seawater and A. carterae culture samples. Similarly, UVR had no significant effect on DMSOp/Chl a in seawater samples (0.83-1.6 nmol DMSO μgâ1 Chl a for PAR + UV vs. 0.70-1.5 nmol μgâ1 for PAR-exposed seawater samples, respectively) or in A. carterae cultures (0.20-1.3 and 0.19-0.88 nmol DMSO μgâ1 Chl a in PAR + UV- and PAR-exposed cultures, respectively). In an experiment with the diatom, Thalassiosira oceanica, the culture was grown in high nitrate (30 μM) or low nitrate (6 μM) media and exposed to PAR-only or PAR + UV. The low nitrate, PAR-only samples showed an increase of intracellular dimethylsulfoniopropionate (DMSP) concentration from 2.1 to 15 mmol Lâ1 in 60 h, but the increase occurred only after cultures reached the stationary phase. Cultures of T. oceanica grown under UVR had lower growth rates than those under PAR-only (μâ²Â = 0.17 and 0.32 dâ1, respectively) and perhaps did not experience severe nitrate limitation even in the low nitrate treatment. These results suggest that the elevated UVR in low nitrate environments could result in reduction of DMSP in some species, whereas DMSP concentrations would not be affected in eutrophic areas.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquatic Botany - Volume 90, Issue 1, January 2009, Pages 37-42
Journal: Aquatic Botany - Volume 90, Issue 1, January 2009, Pages 37-42
نویسندگان
Hyakubun Harada, Maria Vila-Costa, Just Cebrian, Ronald P. Kiene,