کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4537598 | 1626499 | 2008 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Abundance, feeding and reproduction of Calanus finmarchicus in the Irminger Sea and on the northern Mid-Atlantic Ridge in June
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Measurements of hydrography, chlorophyll a, abundance, egg production rates and gut fluorescence of Calanus finmarchicus were made on the northern Mid-Atlantic Ridge, along a north-south transect extending from Iceland to the Azores (â¼60-44°N, 25-35°W) in June 2004. In addition, similar data were sampled in the Irminger Sea and on the Reykjanes Ridge in June 2003. The results show marked differences in abundance, phytoplankton ingestion rates and egg production rates from north to south. C. finmarchicus was most abundant in the central Irminger Sea (â¼80,000-160,000 individuals mâ2, 0-100 m), with abundance declining drastically (<20,000 individuals m) south of â¼58°N. By far, the majority of the animals resided in the upper 100 mâ2 of the water column. Egg production rates were generally the highest near the continental shelf slopes in the western and northeastern parts of the Irminger Sea and in slope waters south of Greenland (â¼40-60 eggs femaleâ1 dâ1). A trend of increasing egg production near the frontal area of the Charlie-Gibbs Fracture Zone also was observed. Phytoplankton ingestion rates, as based on gut fluorescence analysis, were the greatest in the northern Irminger Sea and in slope waters south of Greenland (â¼8-28 μg C female dâ1). The relationships between egg production rates and ingestion rates on the one hand and egg production rates and chlorophyll a concentrations on the other were described by Ivlev curves. The possible causes for the observed spatial variability in abundance and productivity of C. finmarchicus are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Deep Sea Research Part II: Topical Studies in Oceanography - Volume 55, Issues 1â2, January 2008, Pages 72-82
Journal: Deep Sea Research Part II: Topical Studies in Oceanography - Volume 55, Issues 1â2, January 2008, Pages 72-82
نویسندگان
A. Gislason, E. Gaard, H. Debes, T. Falkenhaug,