Limno-ecological assessment of Aras River surface waters in Turkey: application of diatom indices

Çelekli, Abuzer; Kayhan, Seda; Lekesiz, Ömer; Toudjani, Assane Anabi; Çetin, Tolga

doi:10.1007/s11356-019-04295-y

Cited by 16 publications

(6 citation statements)

References 31 publications

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“…In some studies with rivers from different basins that were monitored using diatom indices, the TIT gave compatible results with environmental parameters and indicator species (Çelekli & Bilgi, 2019; Çelekli, Kayhan, et al, 2019; Çelekli, Lekesiz, & Yavuzatmaca, 2021). However, it has been determined that the TIT is not effective in the evaluation of water quality in the minimally disturbed rivers of the Asi, Akarçay and West Mediterrenian basins (Türkiye) studied within the scope of the project ‘Establishment of Reference Monitoring Network in Türkiye’ (Sevindik et al a, b, c; unpublished data) and in routine water quality monitoring study covering the entire Sakarya Basin (Solak et al, 2020).…”

Section: Discussionmentioning

confidence: 78%

Using diatom indices to estimate the ecological status of minimally disturbed rivers of the Sakarya River Basin (Türkiye)

et al. 2023

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In order to determine the ecological status of surface waters of different types in a particular ecoregion, the reference conditions for each type should be identified to compare with observed conditions, as suggested by the Water Framework Directive (WFD). In this study, 36 candidate reference river sites of the Sakarya Basin (Türkiye) were sampled three times in 2018, and the biological assessment of these sites was evaluated using 18 different diatom indices. In addition, nine different environmental variables were also sampled combined with epilithic diatoms. Based on the canonical correspondence analysis (CCA), alkalinity and pH were determined as the most significant environmental variables for diatom assemblages. Among the diatom indices, Biological Diatom Index (IBD), Artois‐Picardie Diatom Index (IDAP), Descy's Index (DES) and Sládeček's Index (SLA) showed significant correlations with alkalinity and pH according to multiple linear regression (MLR) results. IBD index showed the highest response to the pressures and indicated high or good ecological status of the sampling sites. Moreover, rivers with high water quality status have a high correlation with alkalinity, pH and pollution‐sensitive species. On the other hand, good water quality rivers were highly correlated with total phosphorus and intermediate pollution‐sensitive or pollution‐tolerant species. The 13 reference sites established in this study can be used to assess the ecological status by comparison with the same types of river bodies for further studies in the basins of Türkiye.

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Section: Discussionmentioning

confidence: 78%

Using diatom indices to estimate the ecological status of minimally disturbed rivers of the Sakarya River Basin (Türkiye)

et al. 2023

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“…Unless chemical assessment is done regularly, it does not reflect the changes that may occur over time, as it will only give instantaneous values. For this reason, it may not provide complete information on the real conditions of aquatic ecosystems (Bere and Tundisi, 2011;Brack et al, 2019;Çelekli et al, 2019a;Charles et al, 2021). Deterioration of aquatic ecosystems is not only based on factors such as pesticides, xenobiotic, salinity, turbidity, and smell but also there are hundreds of other chemical variables (Merga et al, 2020).…”

Section: Bioassessment Of Surface Watersmentioning

confidence: 99%

“…They provide crucial information about the environment where they live because each taxon has different environmental optima for different pollutants of ecosystems (Stevenson and Pan, 1999;Kelly et al, 2008). Consequently, diatoms are very useful in biological monitoring studies (Martin and Reyes, 2012;Çelekli et al, 2019a). Knowing the indicator characteristics of diatom assemblages is critical for the robust inferences of the environmental conditions in monitoring programs and paleolimnological applications (Juggins and Birks, 2012).…”

Section: Diatom Assemblages As Bioindicatormentioning

confidence: 99%

Bioassessment of water quality of surface waters using diatom metrics

Çelekli¹,

Lekesiz²,

Yavuzatmaca³

2021

Turk J Bot

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Bioassessment of surface waters is one of the most important approaches to predict the deterioration of ecosystems and achieve environmental sustainability according to the application of the European Water Framework Directive. The present review emphasizes the importance of the bioassessment of freshwater quality especially running waters based on diatom metrics. Nutrient enrichment and hydromorphological alternation driven by human activities are the main factors for the ecological compromise of freshwater ecosystems. Currently, the bioassessment of the ecological condition of inland water bodies is adopted worldwide. Bioassessment is complementary to physico-chemical and hydromorphological data for evaluating the ecological conditions of rivers; however, measuring all the physical and chemical changes is expensive and impractical. Therefore, monitoring biota helps to determine the changes occurring in ecosystems. Thus, diatoms are used as bioindicators to assess environmental conditions of the ecosystems, but their use requires great taxonomic knowledge, otherwise, the results will be biased. Many diatom indices have been developed based on the trophic weight and indicator values of diatoms in different ecoregions in the last decades. This review highlights the importance and advantages of using diatom metrics in the bioassessment of the ecological status of surface waters in the different ecoregions, especially running water. To analyze the complex response of diatom communities to environmental gradients and assess the quality of the ecosystem, multivariate statistical approaches are needed.The challenge here is how to define criteria for classes of water bodies in a biologically meaningful way. For this reason, Biological Condition Gradient is suggested as an appropriate and effective approach to develop trophic criteria based on the relationships between nutrient concentrations and biological indicators of ecological conditions.

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“…In Turkey, Çelekli et al (2017, 2019a) have created the Trophic Index Turkey (TIT) based on data collected from 225 running water bodies from eight basins of Turkey. TIT was successfully tested in Northern Aegean, Western Mediterranean, and Aras basins, and in Gaziantep regions (Toudjani et al, 2017;Çelekli et al, 2018, 2019bÇelekli and Kapı, 2019;Çelekli and Arslanargun, 2019).…”

Section: Introductionmentioning

confidence: 99%

Ecological status estimation of eight creeks in the Lake Sapanca Basin (Sakarya, Turkey) using diatom indices

Sevi̇ndi̇k

Uzun

Coşkun

et al. 2021

Ann. Limnol. - Int. J. Lim.

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It is important to determine the water quality of the creeks in the Lake Sapanca basin since it is used for drinking water supply. For this purpose, environmental parameters and diatom assemblages as biological quality components were investigated to determine the ecological status of eight creeks with monthly intervals between March 2015 and February 2016. During the studied period, 19 taxa increased their relative abundance higher than 30% in at least one sample and showed a different seasonal pattern. Main nutrients [(nitrate-nitrogen, orthophosphate, total phosphorus (TP)] and some other parameters (specific conductance, temperature, pH, and dissolved oxygen) had strong impacts on the distribution of diatom assemblages. The ecological status of the creeks was characterized by using four different diatom indices, however, only Trophic Index Turkey (TIT) represented significant positive correlations with log (TP) gradient and separated the creeks as good and moderate ecological status. According to TIT, the 4th and 6th stations had a good ecological condition and were characterized by pollution-sensitive species such as Cymbella affinis, Reimeria sinuata, and Nitzschia dissipata. On the other hand, TIT resulted in the other stations having moderate ecological conditions, which had high nutrient levels and EC. Moreover, the occurrence of pollution-tolerant taxa such as Gomphonema angustatum, Ulnaria ulna, and Achnanthidium affine endorsed the moderate ecological conditions in these creeks. Based on the results, the TIT as a biological metric could be a useful tool for the assessment of running waters in the Sakarya river basin.

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Limno-ecological assessment of Aras River surface waters in Turkey: application of diatom indices

Cited by 16 publications

References 31 publications

Using diatom indices to estimate the ecological status of minimally disturbed rivers of the Sakarya River Basin (Türkiye)

Using diatom indices to estimate the ecological status of minimally disturbed rivers of the Sakarya River Basin (Türkiye)

Bioassessment of water quality of surface waters using diatom metrics

Ecological status estimation of eight creeks in the Lake Sapanca Basin (Sakarya, Turkey) using diatom indices

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