کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6384702 1626633 2015 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Towards the classification of eutrophic condition in estuaries
ترجمه فارسی عنوان
به طبقه بندی شرایط آبزی در استون ها
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی

Water quality and ecological integrity of estuaries closely reflect activities within the entire upstream catchment. Much emphasis has been placed on the response of estuaries to anthropogenic stressors through the use of monitoring programmes. Key to the success of these programmes is the use of indicators, as they transform data into useful information. The aim of this study was to identify the eutrophic condition of selected estuaries along the southern coast of South Africa, using a multi-metric approach to classification. Four permanently open and five temporarily open/closed estuaries were studied. Initially, the daily nutrient loads and flushing time variability were assessed for each estuary. Next, the “state” of the estuaries was determined using a variety of indicators, including: dissolved oxygen, inorganic nutrients (N and P), phytoplankton, epiphytes and microphytobenthos. Specific indicator thresholds, obtained from existing assessment frameworks and literature, enabled an incremental rating of eutrophic condition. Using this approach, an equal number of estuaries were classified as oligotrophic ('Good'), mesotrophic ('Fair') and eutrophic ('Poor'). High daily nutrient loads and/or long flushing times were identified as the primary causes of eutrophic conditions. However, differentiating between naturally and anthropogenically induced symptoms was highlighted as an important consideration in such assessments. This study demonstrated the importance of adopting a holistic and adaptive approach to the assessment of eutrophication in estuaries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 164, 5 October 2015, Pages 221-232
نویسندگان
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