کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6317362 1619191 2013 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Short communicationSensitivity of a green alga to atrazine is not enhanced by previous acute exposure
ترجمه فارسی عنوان
ارتباط کوتاه حساسیت جلبک سبز به آترازین با قرار گرفتن در معرض حاد پیشین افزایش نمی یابد
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- Exposures in aquatic ecosystems to many herbicides are episodic.
- Pulsed exposure to atrazine does not increase sensitivity of Pseudokirchneriella subcapitata in subsequent exposures.
- Recovery of algal growth from a pulsed exposure to atrazine occurs within 24 h.

Exposure to atrazine in small lotic systems can be episodic, with short-term pulses (peaks) followed by lower, decreasing concentrations. Algae and macrophytes recover rapidly from pulsed exposure to atrazine, but reported observations of population response to subsequent exposures are minimal and inconclusive. Consequently, the sensitivity of Pseudokirchneriella subcapitata to atrazine following a pulsed exposure was assessed. Exposure concentrations reflected amplifications of those observed in streams from highly vulnerable watersheds in regions of intense use. Initial pulsed atrazine exposure at 0, 150 or 300 μg/L for 24-h was followed by 72-h exposure to 0, 5, 10, 25, or 50 μg/L. Measured responses were cell density, growth rate, chlorophyll-a, and maximum quantum yield of photosystem II. Algal recovery was rapid and prior pulsed exposure to atrazine did not significantly affect subsequent sensitivity (EC10s, EC25s) for any endpoint, indicating no changes in tolerance at the population level for this species.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 181, October 2013, Pages 325-328
نویسندگان
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