Ecological quality assessment of running waters in the North Aegean catchment with diatom metrics and multivariate approach

Çelekli, Abuzer; Toudjani, Assane Anabi; Lekesiz, Hacı Ömer; Çetin, Tolga

doi:10.1016/j.limno.2018.09.001

Cited by 23 publications

(9 citation statements)

References 28 publications

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“…Among the European diatom indices, IPS having more diatom species has been commonly used to evaluate the surface waters of the Eastern Mediterranean Region such as Cyprus (Cantonati et al, 2020; Pissaridou et al, 2021) and Greece (Karaouzas et al, 2019). The European indices cannot efficiently adapt to the particular hydrological and climatic conditions of the Eastern Mediterranean Region (Çelekli et al, 2018; Çelekli & Bilgi, 2019; Çelekli & Lekesiz, 2020; Lazaridou et al, 2018) because ecoregional factors influence the trophic weight of diatom taxa. The species list of TIT did not include all of the taxa found in the streams and so the revision of the species list is necessary for better the bioassessment of streams.…”

Section: Discussionmentioning

confidence: 99%

Eco‐assessment of Değirmendere and Bulaklı streams using diatom indices from different ecoregions

Çelekli

Yıldız

2022

Ecological Research

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Diatom metrics are important tools for evaluating the environmental conditions of streams for the achievement of environmental sustainability. Aim of the present study was to assess the ecological status of De girmendere and Bulaklı streams using diatom indices developed in different ecoregions and to elucidate responses of diatom assemblages to stressors using multivariate approaches. Analysis of similarity percentage indicated a 74% dissimilarity between De girmendere and Bulaklı streams with the most contribution of Encyonopsis minuta, Achnanthidium minutissimum, Achnanthidium druartii, Amphora indistincta, and Gomphonema cuneolus species to this dissimilarity.The first two axes of canonical correspondence analysis exhibited a strong correlation (93.1%) between diatom assemblages and environment variables. Pollution-tolerant species were associated with Bulaklı stream, whereas pollution-sensitive species displayed relatedness to De girmendere stream. Conductivity, salinity, oxidation-reduction potential, total phosphorus (TP), and orthophosphate were the significant effective environmental factors on the spatiotemporal distribution of diatom assemblages. Used diatom indices showed significantly positive and negative correlations with TP gradient. The results of bioassessment exhibited that diatom indices have different scores for the ecological status of the sampling stations. European diatom indices except Trophic Diatom Index and Duero Diatom Index mainly showed similar behavior in the bioassessment of ecological conditions of De girmendere and Bulaklı streams. Among European diatom indices, Trophic Index Turkey was more competitive and could give better results in the bioassessment of streams. Results indicated that ecoregional specific diatom index could be used as a suitable tool to accurately evaluate the surface water quality.

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Section: Discussionmentioning

confidence: 99%

Eco‐assessment of Değirmendere and Bulaklı streams using diatom indices from different ecoregions

Çelekli

Yıldız

2022

Ecological Research

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“…Chlorococcales in Lake Bafa was the dominant order in the second dominant group of Chlorophyceae. Likely, Scenedesmus and Pediastrum species had been found abundantly in oligomesotrophic reservoirs and eutrophic lakes in Turkey (İşbakan- Taş et al, 2002;Kıvrak and Gürbüz, 2005;Ongun-Sevindik, 2010;Çelekli et al, 2018). Wetzel (1975) reported that members of the Euglenophyceae classis were mostly found in shallow waters rich in organic matter.…”

Section: Discussionmentioning

confidence: 99%

Untitled

2021

EgeJFAS

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Phytoplankton groups are one of the major quality element to be used in the evaluation of the trophic and ecological state of freshwater ecosystems according to the EU Water Framework Directive. This research was made to assess the trophic and ecological status of Lake Bafa in Turkey, on the basis of phytoplankton communities. Büyük Menderes River is one of the most important factor that carries pollutants to Lake Bafa. The eight sampling station were assigned to evaluate the ecological and trophic state of the lake. Phytoplankton species were collected monthly for 2 years study period. Most commonly used phtoplankton indices Q index and Carlson's Trophic State Index (TSI), and different versions of diversity indices were used to estimate trophic and ecological state of the lake. Similarities between the sampling stations were clustured by using the unweighted pair group method using arithmetic average (UPGMA), based on phytoplankton communities. Correlations between the applied indices were determined by using Pearson Correlation. After the identification of collected phytoplanktons, total of 63 taxa which belong to classis of Cyanophyceae (11.2%), Bacillariophyceae (49.2%), Chlorophyceae (23.8%), Xanthophyceae (1.5%), Euglenophyceae (11.2%) and Dinophyceae (3.1%) were detected. The 1 st and 2 nd stations were the most similar stations to each other (88%) according to phytoplankton communities. Secchi disc depth (SD) and TP played an important role in the distribution of phytoplankton species in Lake Bafa. The highest significant positive correlation was determined between Q and TSI (r = 0.987, p˂0.01). Considering the TDI values in the phytoplankton composition of the lake, it can be said that although the productivity status of the studied lake is still "mesotrophic", it has a tendency towards "eutrophic" state. According to the Q values, the first five stations reflect the moderate ecological state, while the 6 th , 7 th and 8 th stations represent the poor ecological state.

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“…All of them support that diatom assemblages as ecological indicators are widely used to estimate the ecological status of aquatic ecosystems in different ecoregions (Rott et al, 1999;Dell'Uomo, 2004;Smol and Stoermer, 2010;Lobo et al, 2016;Ruwer et al, 2018;Çelekli et al, 2019b;Pinheiro et al, 2020;Pham, 2020). Additionally, diatoms occur in almost all surface waters at all times of the year, which is the biggest advantage of the use of diatoms when determining the ecological quality of water bodies (Ács et al, 2004;Smol and Stoermer, 2010;Çelekli et al, 2018). Also, very strong correlations between stressors and diatoms confirm the highly accurate assessment of ecological conditions (Toudjani et al, 2017;Chen et al, 2019).…”

Section: Diatom Assemblages As Bioindicatormentioning

confidence: 94%

“…Therefore, an important endeavor has been put forward to assess water quality by using the combination of biological and physicochemical variables in recent decades (Rott et al 2003;Lobo et al 2015Lobo et al , 2016Çelekli et al 2018;Çelekli and Arslanargun, 2019).…”

Section: Bioassessment Of Surface Watersmentioning

confidence: 99%

“…The direct use of indices developed in different ecoregions for a specific country may produce erroneous results to assess the state of water quality (Tomas et al, 2017;Çelekli et al, 2018;Riato et al, 2018). Geographical variations among countries, differences in human population density, land uses extent (agricultural, industrial, urban), and climate can be shown as the obstacles for the direct use of these indices to accurately interpret the water quality (Soininen, 2007;Çelekli et al, 2018;Charles et al, 2021). Ecoregional variation (e.g., geology, climate, land-uses, and anthropogenic activities) in countries can constraint and regulate diatom composition and their abundance.…”

Section: Rhoicosphenia Abbreviata Ti Tittdilmentioning

confidence: 99%

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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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Ecological quality assessment of running waters in the North Aegean catchment with diatom metrics and multivariate approach

Cited by 23 publications

References 28 publications

Eco‐assessment of Değirmendere and Bulaklı streams using diatom indices from different ecoregions

Eco‐assessment of Değirmendere and Bulaklı streams using diatom indices from different ecoregions

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Bioassessment of water quality of surface waters using diatom metrics

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