ASSESSMENT OF WATER QUALITY USING EPIPHYTIC DIATOM ASSEMBLAGES ONCLADOPHORAFROM THE ST. LAWRENCE RIVER (CANADA)

Epilithic diatoms were sampled at 48 sites along the St. Lawrence River, from Salaberry de Valleyfield to Québec City, in an attempt to determine how diatom assemblages were related to measured water quality variables. Canonical correspondence analysis was used to explore the relationships between environmental variables and patterns in the epilithic diatom assemblages. "Distance downstream from Cornwall" was determined to be the strongest variable influencing the structure of epilithic diatom assemblages, likely due to the effect of tides (favouring aerophilic species) closer to the river outlet. Variables related to pollution (suspended solids, fecal coliforms, chlorophyll a) also explained significant (P < 0.05) amounts of variance in the diatom assemblages. The optima of common diatom species to suspended solids were explored further. Reconstructive models using weighted-averaging calibration and regression illustrated that "distance from Cornwall" and concentrations of suspended solids, fecal coliforms, and chlorophyll a, the most influential variables, could be inferred from the diatom assemblages. When compared with the inference models developed for pollution variables using epiphytic diatom assemblages (attached to macrophytes or Cladophora), the epilithon model appears to perform better.Key words: diatoms, rocks, epilithic, St. Lawrence River, water quality, calibration.

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Relationships between epipelic diatoms, aquatic macrophytes, and water quality in Akarçay Stream, Afyonkarahisar, Turkey

Oceanological and Hydrobiological Studies ◽

10.2478/s13545-012-0009-z ◽

2012 ◽

Vol 41 (1) ◽

Cited By ~ 5

Author(s):

Mustafa Kargıoğlu ◽

Ahmet Serteser ◽

Ersin Kıvrak ◽

Yılmaz İçağa ◽

Muhsin Konuk

Keyword(s):

Water Quality ◽

Correspondence Analysis ◽

Diatom Assemblages ◽

Diatom Indices ◽

Macrophyte Community ◽

Epipelic Diatoms ◽

Central Turkey ◽

Very High ◽

Macrophyte Index

AbstractThe Akarçay is the most important stream in the Afyonkarahisar region in central Turkey. In this study, the relationships between epipelic diatoms, macrophytes, and the water quality of Akarçay Stream are presented. According to Canonical Correspondence Analysis (CCA), BOD5, COD, TDS, NH4-N, NO2-N, and PO4-P had the most significant effects on the diatom and macrophyte community structures of the stream. According to CCA and Correspondence Analysis (CA), dominant diatom species and macrophytes constituted two groups, eutrophic and polluted. While eutraphentic taxa were abundant among upstream diatoms, hypereutraphentic taxa were found downstream in the Akarçay. The diatom assemblages in the sites upstream were generally characterized by an abundance of β-mesosaprobous and α-mesosaprobous species, while the diatom assemblages downstream had a very high abundance of polisaprobous species. Eutrophic and hypertrophic macrophyte taxa (such as Lemna trisulca, Potamogeton nodosus, and Ranunculus sp.) covered a high percentage of the stream bottom. Both diatom indices and macrophyte indices with the exception of the Biological Macrophyte Index of Rivers (IBMR) were correlated with BOD5, COD, TDS, NH4-N, NO2-N, PO4-P, and EC. Physicochemical variables, diatom and macrophyte taxa and the results of diatom and macrophyte indices indicated that the Akarçay stream basin is eutrophic and organically polluted.

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Tracking long-term human impacts on landscape, vegetal biodiversity and water quality in the Lake Aydat catchment (Auvergne, France) using pollen, non-pollen palynomorphs and diatom assemblages

Palaeogeography Palaeoclimatology Palaeoecology ◽

10.1016/j.palaeo.2015.02.016 ◽

2015 ◽

Vol 424 ◽

pp. 76-90 ◽

Cited By ~ 21

Author(s):

Yannick Miras ◽

Aude Beauger ◽

Marlène Lavrieux ◽

Vincent Berthon ◽

Karen Serieyssol ◽

...

Keyword(s):

Water Quality ◽

Human Impacts ◽

Diatom Assemblages

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The use of epilithic diatom assemblages in assessing land use in Silago, Southern Leyte, Philippines

10.26757/pjsb.2018b12008 ◽

2019 ◽

Vol 12 (2) ◽

Keyword(s):

Water Quality ◽

Land Use ◽

Tolerance Index ◽

Diatom Species ◽

Diatom Assemblages ◽

Pollution Tolerance ◽

Land Use Types ◽

Freshwater Bodies ◽

Forested Areas ◽

Epilithic Diatom

Silago is a municipality in Southern Leyte in which logging for high-quality timber and land clearing for agricultural purposes threaten stream ecosystems. The objective of this study was to assess the response of diatom assemblages in relation to land use. Diatoms and water quality sampling was done at 27 sites on two sampling occasions (June and July 2014). Multiple diatom metrics were calculated to measure the response of diatoms to changes in land use. In all, 135 diatom species distributed to 48 genera were recorded. The results showed that diatom species and their attributes gave similar responses to those obtained in environmental variables. Pollution tolerance index classified all sampling sites as oligo-b-mesosaprobic. Meanwhile, Cymbella richness, percent motile taxa, and percent Achnanthidium minutissimum indicated good water quality in forested areas, distinguishing them from other land use types. Contrary to other studies, species richness was found to increase with greater degrees of disturbance, thus giving unreliable evaluation of water quality. Overall, the study suggests that epilithic diatoms can be applied in biomonitoring of freshwater bodies in the country.

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Perspective of the diatom research in the Arctic

Issues of modern algology (Вопросы современной альгологии) ◽

10.33624/2311-0147-2019-2(20)-45-49 ◽

2019 ◽

pp. 45-49

Author(s):

Dmitrii B. Denisov ◽

Anna L. Kosova

Keyword(s):

Water Quality ◽

Lake Sediments ◽

Large Scale ◽

High Efficiency ◽

Arctic Region ◽

Water Quality Assessment ◽

The State ◽

The Arctic ◽

Diatom Assemblages ◽

Murmansk Region

Large-scale diatom communities and diatom complexes of lake sediments researches in the Euro-Arctic region have been carried out. The high efficiency of bioindication of water quality and the state of ecosystems based on diatoms have been shown for the water quality assessment and anthropogenic loads rationing on water resources of high latitudes. Diatom assemblages from lake sediments of different types of aquatic ecosystems reflect the present-day warming of the Arctic climate and the effects of aerotechnogenic pollution. Diatom assemblages of surface (0–1 cm) layers of lake sediments could well serve for the integral assessment of the state of ecosystems and water quality. Diatoms diversity of the Green Belt of Fennoscandia in the territory of the Murmansk region has been investigated.

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Linkages among land-use, water quality, physical habitat conditions and lotic diatom assemblages: A multi-spatial scale assessment

Hydrobiologia ◽

10.1023/b:hydr.0000027318.11417.e7 ◽

2004 ◽

Vol 515 (1-3) ◽

pp. 59-73 ◽

Cited By ~ 66

Author(s):

Yangdong Pan ◽

Alan Herlihy ◽

Philip Kaufmann ◽

Jim Wigington ◽

John van Sickle ◽

...

Keyword(s):

Water Quality ◽

Land Use ◽

Spatial Scale ◽

Physical Habitat ◽

Habitat Conditions ◽

Diatom Assemblages ◽

Scale Assessment

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Long-term water quality changes in a multiple-stressor system: a diatom-based paleolimnological study of Lake Simcoe (Ontario, Canada)

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f2011-134 ◽

2012 ◽

Vol 69 (1) ◽

pp. 24-40 ◽

Cited By ~ 23

Author(s):

Jessica Hawryshyn ◽

Kathleen M. Rühland ◽

Roberto Quinlan ◽

John P. Smol

Keyword(s):

Water Quality ◽

Regional Climate ◽

Sediment Cores ◽

Phosphorus Loading ◽

Diatom Assemblages ◽

Late 20Th Century ◽

System A ◽

Multiple Stressor ◽

Lake Simcoe

Diatom-based paleolimnological techniques were used to assess long-term changes in the water quality of Lake Simcoe (Ontario, Canada) using 210Pb-dated sediment cores from four sites across the lake. Modest lake-wide shifts in diatom community composition occurred in the late 19th and early 20th centuries, suggesting that early cultural disturbances (e.g., land clearance and canal construction) had relatively minor effects on Lake Simcoe water quality. However, starting in the 1930s, phosphorus loading to the lake increased, which was closely tracked by increases in diatom taxa indicative of eutrophic conditions. The most pronounced lake-wide shift in diatom assemblages occurred in the mid- to late 20th century, the nature and timing of which strongly suggested a response to regional climate warming. An additional and marked lake-wide shift in diatom assemblages occurred in the mid-1990s, coinciding with the invasion of dreissenid mussels in Lake Simcoe. Our results indicate that Lake Simcoe water quality has been affected by the interaction of numerous environmental stressors over the past two centuries, the complexity of which has been amplified by recent warming.

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Diatom diversity and water quality of a suburban stream: a case study of the Rzeszów city in SE Poland

Biodiversity Research and Conservation ◽

10.1515/biorc-2016-0004 ◽

2016 ◽

Vol 41 (1) ◽

pp. 19-34 ◽

Cited By ~ 1

Author(s):

Teresa Noga ◽

Jadwiga Stanek-Tarkowska ◽

Urszula Kloc ◽

Natalia Kochman-Kędziora ◽

Mateusz Rybak ◽

...

Keyword(s):

Water Quality ◽

Ecological Status ◽

Sensitivity Index ◽

Diatom Assemblages ◽

Diatom Index ◽

Se Poland ◽

Physicochemical Factors ◽

Index Index ◽

The City

Abstract The aim of this work was to investigate the diversity of diatom assemblages developed in the Przyrwa stream, to assess water quality based on benthic diatoms and to make an attempt at the identification of physicochemical factors having the greatest impact on the differentiation of diatom assemblages. Studies were conducted in 2011-2012 on the Przyrwa stream, a left-side tributary of the Wisłok River flowing through the city of Rzeszów and with its spring section located on the borders of the city. A total of 259 diatom taxa were identified in the Przyrwa stream during three studied seasons. At all investigated sites, the most abundant population consisted of Ulnaria ulna (Nitzsch) Compère, Cocconeis pediculus Ehrenb., Achnanthidium minutissimum (Kütz.) Czarnecki var. minutissimum, Navicula gregaria Donkin, Planothidium frequentissimum (Lange-Bert.) Lange-Bert., P. lanceolatum (Brébisson) Lange-Bert., Navicula lanceolata (C. Agardh) Ehrenb., Amphora pediculus (Kütz.) Grunow, Eolimna minima, (Grunow) Lange-Bert., Melosira varians C. Agardh and Cyclotella meneghiniana Kütz. Based on IPS (Specific Pollution Sensitivity Index) and GDI (Generic Diatom Index) indices, the ecological status of the Przyrwa stream was assessed as moderate to poor (mostly III-IV class of water quality), while the TDI (Trophic Diatom Index) index indicated a poor to bad ecological status (mainly IV-V class of water quality).

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