کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6324656 1619744 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ecotoxicity of sediments in rivers: Invertebrate community, toxicity bioassays and the toxic unit approach as complementary assessment tools
ترجمه فارسی عنوان
سموم زیستی رسوبات در رودخانه ها: جامعه بی مهرگان، آزمایش های زیستی سمیت و روش واحد سمی به عنوان ابزار ارزیابی مکمل
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- We performed a sediment toxicity risk assessment in four rivers of the Iberian Peninsula.
- The risk assessment included chemical, toxicological and ecological descriptors.
- Acute toxicity for unicellular organisms was detected in most of the samples.
- Lethal and sub-lethal effects were detected with the C. riparius long-term test.
- Organophosphate insecticides and metals were the main contributors to the toxicity.

The determination of the real toxicity of sediments in aquatic ecosystems is challenging and necessary for an appropriate risk assessment. Different approaches have been developed and applied over the last several decades. Currently, the joint implementation of chemical, ecological and toxicological tools is recommended for an appropriate and successful toxicity risk assessment. We chose the combination of the toxic unit approach with acute pore water tests (Vibrio fischeri, Pseudokirchneriella subcapitata and Daphnia magna) and whole-sediment exposure tests (V. fischeri, Chironomus riparius), together with invertebrate community composition (multivariate analyses) to detect short and long-term responses of the organisms in four rivers of the Iberian Peninsula. High toxicity was detected in three sites (the downstream sites of the Llobregat and the Júcar, and the most upstream site of the Ebro). We identified organophosphate insecticides and metals as the main variables responsible for this toxicity, particularly in the whole-sediment tests. In particular, chlorpyrifos was mostly responsible for the toxicity (TUs) of D. magna, coinciding with the C. riparius mortality (long-term toxicity) in the mentioned sites, and copper was the main pollutant responsible for the short-term toxicity of P. subcapitata. The combination of the different approaches allowed us to detect ecotoxicological effects in organisms and identify the main contributors to the toxicity in these multi-stressed rivers.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 540, 1 January 2016, Pages 297-306
نویسندگان
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