کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4537516 | 1626497 | 2008 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Virioplankton dynamics and virally induced phytoplankton lysis versus microzooplankton grazing southeast of the Kerguelen (Southern Ocean)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
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چکیده انگلیسی
Viral dynamics, community structure, and the impact of viruses on phytoplankton mortality in comparison with microzooplankton grazing were determined in the natural iron-fertilized waters southeast of the Kerguelen Islands, Southern Ocean, during the austral summer (January-February 2005). The study area was characterized by a phytoplankton bloom above the Kerguelen Plateau and the high-nutrient low-chlorophyll waters surrounding it. During the Kerguelen Ocean and Plateau compared Study (KEOPS), viral abundance was relatively high (1-19Ã107 mLâ1) as compared to the few other studies in the Southern Ocean, significantly correlating with depth and system productivity. Viral abundance showed a strong positive relationship with the numerically dominant bacterial hosts, which in turn were correlated to phytoplankton biomass. In total, 13 different viral genome sizes were detected, with the lower-sized genomes 34 and 68 kb dominating at all stations. The viral community at the low chlorophyll C-transect grouped apart from the more productive transects A and B. Potential algal viruses were recorded for all stations, but only at very low intensities. Virally induced lysis of the smaller-sized (<10 μm) phytoplankton was a minor loss factor as compared to microzooplankton grazing (up to 6% and 45% of total <30 μm algal standing stock per day, respectively). Grazing was phytoplankton population-specific, but was in all cases able to keep the standing stock of the small-sized phytoplankton low (net growth rates between â0.2 and 0.2 dâ1). Microzooplankton regenerated on average 1.1 pM Fe dâ1 (present study), which represented approximately 30% of the total regeneration rate and at least 15% of the total biogenic Fe demand as calculated by [Sarthou, G., Vincent, D., Christaki, U., Obernosterer, I., Timmermans, K.R., Brussaard, C.P.D., 2008. The fate of biogenic iron during a phytoplankton bloom induced by natural fertilization: impact of copepod grazing. Deep-Sea Research II].
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Deep Sea Research Part II: Topical Studies in Oceanography - Volume 55, Issues 5â7, MarchâApril 2008, Pages 752-765
Journal: Deep Sea Research Part II: Topical Studies in Oceanography - Volume 55, Issues 5â7, MarchâApril 2008, Pages 752-765
نویسندگان
C.P.D. Brussaard, K.R. Timmermans, J. Uitz, M.J.W. Veldhuis,