کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4397769 1305905 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Immersed in situ microcosms: A tool for the assessment of pollution impact on phytoplankton
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Immersed in situ microcosms: A tool for the assessment of pollution impact on phytoplankton
چکیده انگلیسی

In situ phytoplankton microcosms were developed and characterized for use in toxicity testing. The microcosms contained 225 μm filtered seawater maintained in 1 liter glass bottles attached to a plastic frame and immersed at 3 m under the sea surface. Synechococcus and picoeukaryote population dynamics in microcosms and the surrounding water were compared. A bloom-like behaviour observed for Synechococcus in these phytoplankton microcosms was avoided when 10% of the culture volume was replaced, every two days, by filtered seawater. After 2 weeks, no significant difference in Synechococcus and picoeukaryotes cell counts was observed in microcosms compared to the surrounding free seawater. Synechococcus fluorescence at 545 nm (phycoerythrobilin) fluctuated with a similar pattern in such microcosms and in free seawater and were shown to be correlated to light intensity fluctuations over a two week experiment. The in situ microcosms were used to study the impact of low copper additions. Synechococcus populations were dramatically decreased by copper addition, while picoeukaryote populations were increased simultaneously. Our data show that drastic changes in species composition can occur at copper concentrations encountered in polluted coastal areas.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Experimental Marine Biology and Ecology - Volume 341, Issue 2, 5 March 2007, Pages 274–281
نویسندگان
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