Limno-ecological assessment of Aras River surface waters in Turkey: application of diatom indices
| Autor: | Ömer Lekesiz, Abuzer Çelekli, Seda Kayhan, Tolga Çetin, Assane Anabi Toudjani |
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| Rok vydání: | 2018 |
| Předmět: |
Turkey
Health Toxicology and Mutagenesis 010501 environmental sciences 01 natural sciences Freshwater ecosystem Rivers Water Quality Environmental Chemistry media_common.cataloged_instance European union 0105 earth and related environmental sciences Trophic level media_common Diatoms biology Ecology Mediterranean Region Ecological assessment General Medicine Eutrophication biology.organism_classification Pollution Didymosphenia geminata Diatom Water Framework Directive Environmental science Environmental Monitoring |
| Zdroj: | Environmental science and pollution research international. 26(8) |
| ISSN: | 1614-7499 |
| Popis: | This study is the first attempt to evaluate the limno-ecological status of freshwater ecosystems in Aras River system (Turkey) using diatom metrics and multivariate analyses according to the European Union Water Framework Directive requirements. Samples were collected using the standard protocols from 17 sampling stations in August and October of 2014, and June of 2015. Deterioration of water quality in the Aras River catchment was remarked from the downstream of Karakoyunlu, Sarisu, and Bozkus creeks, which showed higher values of trophic index Turkey (TIT), trophic index (TI), and eutrophication and/or pollution index-diatom (EPI-D). These sites were also characterized by pollution tolerant taxa e.g., Cocconeis placentula, Gomphonema parvulum, Navicula cryptocephala, Navicula trivialis, and Tryblionella angustata. Sites S14–S17 had high ecological status according to TIT, supported by the score of EPI-D which indicated a good ecological condition for S14. The occurrence of pollution-sensitive species (e.g., Hannaea arcus, Cymbella affinis, Didymosphenia geminata, Meridion circulare, and Encyonema silesiacum) and the low nutrients like total phosphorus, orthophosphate and nitrate, conductivity, and BOD5 supported the high ecological status of S14–S17. The relationships between diatom assemblages and environmental variables were also illustrated by multivariate analyses. Spearman correlation analysis revealed that TIT had positive important correlations with total phosphorus (p |
| Databáze: | OpenAIRE |
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