Critical approach to diatom-based bioassessment of the regulated sections of urban flowing water ecosystems

Szczepocka, Ewelina; Żelazna-Wieczorek, Joanna; Nowicka-Krawczyk, Paulina

doi:10.1016/j.ecolind.2019.04.078

Cited by 12 publications

(14 citation statements)

References 26 publications

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“…The hydrochemical background of the stream was assessed during the present hydrobiological surveys similar to previous studies ( Szczepocka, Żelazna Wieczorek & Nowicka-Krawczyk, 2019 ). The ranges and mean values of the parameters are given in Table S1 .…”

Section: Methodsmentioning

confidence: 99%

“…Phytobenthic samples of diatoms were collected in October 2017, January, March, May, July and August 2018 from zones of mid-speed water current. Diatom material was collected according to the procedure described in Szczepocka, Żelazna Wieczorek & Nowicka-Krawczyk (2019) . In total, 23 fresh samples were collected.…”

Section: Methodsmentioning

confidence: 99%

“…These transformations strongly modify the hydrological regime and the hydrochemical conditions, thus altering the aquatic communities into a form far from ‘natural’ for the type of environment i.e., lotic ecosystems become full of lentic-type organisms. Therefore, any bioassessment of water quality and ecological status based on these modified communities may yield incorrect results, as demonstrated by Żelazna-Wieczorek & Nowicka-Krawczyk (2015) ; Szczepocka, Żelazna Wieczorek & Nowicka-Krawczyk (2019) .…”

Section: Introductionmentioning

confidence: 99%

“…As diatoms are used as indicators for such a wide range of purposes, the bioassessment procedures may incur some errors that cannot be avoided. Disturbances in river/stream continuity usually result in incorrect results being obtained for the ecological status assessment, indicated by large differences being observed between individual sections of the ecosystem ( Szczepocka, Żelazna Wieczorek & Nowicka-Krawczyk, 2019 ; Charles et al, 2021 ; Latinopoulos et al., 2021 ).…”

Section: Introductionmentioning

confidence: 99%

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Response of diatom assemblages to the disruption of the running water continuum in urban areas, and its consequences on bioassessment

Szczepocka

Nowicka-Krawczyk

Olszyński

et al. 2021

PeerJ

Self Cite

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Transformation of river and stream channels disrupts their natural ecological cycles and interrupts the continuum of their ecosystems. Changes in natural hydromorphological conditions transform lotic communities into those atypical of flowing waters, resulting in bioassessment procedures yielding incorrect results. This study shows how hydromorphological transformations of ecosystems affect the ecological status bioassessment results by disturbing diatom communities typical for rivers. Moreover, the article presents a new biological assessment procedure for urban transformed rivers including the verification of the community structure based on autecology and quantity of species. The ecological status of the ecosystem was assessed using benthic diatom assemblages and supported with results of hydrochemical analysis. The structure of the assemblages and their relationships between individual sampling sites were clarified by shade plot and multivariate data analyses. The analysis of dominant species vitality at sampling sites and their autecology gave the foundation for modification of taxa data matrix and recalculation the diatom indices. Biological assessment showed that one of the artificial ponds constructed at the stream channel was characterized by good ecological status, and its presence strongly affected the state of the downstream ecosystem following the development of a unique assemblage of diatoms that prefer oligosaprobic and oligotrophic waters. The presence of these species was also noted in the downstream sections, but most of the cells were dead. As the indicator values of these taxa are high, their presence artificially increased the ecological status of the stream, resulting in the hydrochemical assessment not being in line with the bioassessment. Therefore, a new procedure was adopted in which non-characteristic taxa for the downstream sections were excluded from analysis. This approach corrected the results of bioassessment characterizing the ecological status of the stream as poor along its entire course, with the exception of this unique pond. For hydromorphologically transformed streams and rivers with disturbed channel continuity, the correct result of an incorrect diatom-based bioassessment may be retrieved after excluding species unusual for the type of ecosystem from the studied assemblages, i.e., the species which are unable to reproduce in that area and are only carried into it by the water flow. Assessment of the ecological status of aquatic ecosystems based on biotic factors is an essential tool of aquatic ecosystems monitoring in many countries. This type of assessment requires a multifaceted approach, in particular, to identify factors that may disrupt this assessment. Standardization of biomonitoring methods is an important step in correct assessment; thus, the findings of this paper will be useful in routine biomonitoring around the world.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Response of diatom assemblages to the disruption of the running water continuum in urban areas, and its consequences on bioassessment

Szczepocka

Nowicka-Krawczyk

Olszyński

et al. 2021

PeerJ

Self Cite

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“…Research dealing with bioindicators has gained momentum to understand the responses of species to stressors and such kinds of studies indicate an uptrend. Many bioassessment studies deal with diatom metrics have been carried out in Europe, Asia, and America (e.g., Lavoie et al, 2009;Wachnicka et al, 2011;Bere, 2016;Vilmi et al, 2016;Xue et al, 2019;Szczepocka et al, 2019;Tapolczai et al, 2019;Edwards et al, 2020), while there are a few studies in Turkey, e.g., in the West Mediterranean basin (Çelekli and Lekesiz, 2020), Aras basin (Çelekli et al, 2019a), Sakarya basin (Çetin and Demir, 2019) and the southeast of Anatolia (Çelekli and Arslanargun, 2019;Çelekli and Bilgi, 2019;Çelekli and Kapı, 2019). Results indicated that the number of studies related to diatom indices based on the ecoregion should increase to obtain clearer and more accurate results in Turkey.…”

Section: Rhoicosphenia Abbreviata Ti Tittdilmentioning

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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Assessment of ecological state of serially impounded Himalayan River using diatoms-based matrices: Identification of critical stretches for management

Kumar

Nautiyal

2024

Ecological Frontiers

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Critical approach to diatom-based bioassessment of the regulated sections of urban flowing water ecosystems

Cited by 12 publications

References 26 publications

Response of diatom assemblages to the disruption of the running water continuum in urban areas, and its consequences on bioassessment

Response of diatom assemblages to the disruption of the running water continuum in urban areas, and its consequences on bioassessment

Bioassessment of water quality of surface waters using diatom metrics

Assessment of ecological state of serially impounded Himalayan River using diatoms-based matrices: Identification of critical stretches for management

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