کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4532869 1325153 2010 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phytoplankton production and physiological adaptation on the southeastern shelf of the Agulhas ecosystem
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Phytoplankton production and physiological adaptation on the southeastern shelf of the Agulhas ecosystem
چکیده انگلیسی
An investigation of phytoplankton production and physiology was undertaken during two research cruises on the southeastern shelf of southern Africa. The data set included photosynthesis-irradiance and active fluorescence parameters, phytoplankton absorption coefficients and HPLC pigment concentrations. Primary production was estimated to vary over a similar range for both cruises within 0.27-3.69 g C m−2 d−1. Pigment indices indicated that diatoms were dominant on the first cruise and the communities were subject to conditions where the mixed layer was deeper than the euphotic zone and they optimized their photosynthesis to very low light intensities at the bottom and below the euphotic zone. Mixed diatom-flagellate populations were observed during the second cruise where the euphotic zone was deeper than the mixed layer and the populations adapted to irradiances higher in the euphotic zone. In response to a mean lower water column PAR, it was found that these mixed communities increased the proportion of chlorophyll a in the pigment pool and had a higher quantum yield of photochemistry and higher light-limited photosynthetic efficiency.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Continental Shelf Research - Volume 30, Issue 13, 31 July 2010, Pages 1472-1486
نویسندگان
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