Impact of wastewater effluent on the diatom assemblages structure of a brackish small stream: Oued Hassar (Morocco)

Fawzi, Brahim; Loudiki, M.; Oubraim, Said; Sabour, Brahim; Chlaida, Mohamed

doi:10.1016/s0075-9511(02)80017-2

Cited by 16 publications

(14 citation statements)

References 5 publications

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“…These taxa have been described as highly tolerant and resistant to organic pollution (Vidal & Gentili 2000, Fawzi et al 2002, Soininen 2002, John 2004, Rakowska 2004. Low elevation stretches support high irradiances, slow-moving waters and naturally high nutrient concentrations.…”

Section: Discussionmentioning

confidence: 99%

Indicator taxa of benthic diatom communities: a case study in Mediterranean streams

Tornés

Cambra

Gomà

et al. 2007

Ann. Limnol. - Int. J. Lim.

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A key issue in the implementation of the Water Framework Directive is the classification of streams and rivers using biological quality parameters and type-specific reference conditions. Four groups of stream types were defined in NE Spain on the basis of 152 diatom samples by means of detrended correspondence analysis and classification techniques. Diatom analysis was restricted to epilithic taxa, and the sites included gradients ranging from near-natural streams to sites with poor ecological quality. The main gradient shows a clear separation of sites in relation to the degree of human influence: polluted streams (mainly located in the lowlands) differ from streams in mountainous areas and in the Pyrenees. A second gradient is related to physiographical features. Headwater streams can be distinguished by their catchment geology. The type-specific diatom taxa for the stream types studied were determined by using indicator species analysis (IndVal). The type-specific taxa from near-natural streams are coincident with the indicator taxa for high ecological status. Human impact reduced the typological heterogeneity of the diatom community composition. Overall, the diatom communities in NE Spain exhibit a regional distribution pattern that closely corresponds with that observed in river systems elsewhere. Physiographical differences are only evident in undisturbed sites, while nutrient enrichment and other human disturbances may mask the regional differences in the distribution of diatom communities.

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Section: Discussionmentioning

confidence: 99%

Indicator taxa of benthic diatom communities: a case study in Mediterranean streams

Tornés

Cambra

Gomà

et al. 2007

Ann. Limnol. - Int. J. Lim.

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“…At first, methods were devoted to monitoring organic pollution and afterwards for salinity, eutrophication, acidification, and general water quality (Ector & Rimet, 2005;Kelly, 1998;Prygiel et al, 1999;Rott et al, 2003). Numerous studies describing relationships between European diatoms indices and water chemistry have been carried out by specific programs (Lecointe et al, in Ector et al, 1999) and largely confirmed the validity of diatom indices for monitoring rivers in Europe (Dokulil et al, 1997;Eloranta & Soininen, 2002;Kwandrans et al, 1998;Montesanto et al, 1999) but also on other continents (Fawzi et al, 2002;Rott et al, 1998;Sgro & Johansen, 1998). It should be clear that if European indices can give a good indication of the river water quality, they have to be optimized.…”

Section: Introductionmentioning

confidence: 93%

Can diatom-based pollution indices be used for biomonitoring in South Africa? A case study of the Crocodile West and Marico water management area

Prygiel²,

et al. 2007

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The inclusion of diatoms into the current suite of biomonitoring tools in use in South Africa, as well as the use of European and other diatom indices in South Africa, and in particular the Crocodile and West Marico water management area, is discussed. The indices, when compared to chemical analyses, proved useful in providing an indication of the quality of the investigated waters. Several widely distributed diatom species were shown to have similar ecological tolerances in South Africa when compared to Europe. Although most of the diatoms encountered in the study were cosmopolitan, several possibly endemic species were recorded. The occurrence of endemic species, not included in existing diatom indices may lead to miscalculations of diatom indices. It is concluded that although diatom indices developed in Europe and elsewhere are useful at the present to indicate water quality, a diatom index unique to South Africa including endemic species will have to be formulated.

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“…This suggests that although land use and seasonal changes may be a factor that influences pH, other external factors may also be major determinants of pH measurements in rivers. A number of factors may affect the proportion of major ions (hence pH) in a landscape, including geological, atmospheric, biological and anthropogenic activities (Fawzi et al, 2002). For example, consumption of carbon dioxide by aquatic plants results in an increase in pH during photosynthesis, while during respiration and decomposition, released carbon dioxide results in decreased pH (Schneider et al, 2000).…”

Section: Ndarugumentioning

confidence: 99%

Spatio-temporal dynamics of land use practices on rivers in tropical regions: A case study of Ruiru and Ndarugu Basins, Kiambu County, Kenya

Wambugu¹,

Isaiah²,

Shadrack³

2017

Afr. J. Environ. Sci. Technol.

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Land use dynamics are known to cause considerable modifications to the environment with broad and sometimes severe impacts on water quality and aquatic natural resources. In this study, the impacts of land use practices on water quality were estimated during the dry and wet seasons in Ruiru and Ndarugu Rivers, Kenya using remote sensing, geographic information systems and statistical techniques. A total of 12 sampling sites associated with three different land use types (forest, agriculture and urban) were selected. All water quality parameters were measured in situ in two dry seasons and two wet seasons and subjected to Kruskal Wallis statistical analyses. Significant variations were seen in water quality parameters between land use types. Higher temperatures were associated with urban dominated sub-basins, while dissolved oxygen was highest in forest sites. Turbidity was highest in agricultural sites and lowest in forested sites, but pH did not differ significantly across all sites. Seasonal impacts were recorded for most water quality parameters tested in all land use types, with agriculture and urban land use showing stronger impacts on water quality in the wet season than in the dry season. This study indicates that both agricultural and urban land use are key factors that affect water quality change. Land-use specific water conservation measures should be enhanced to limit both point and non-point sources of pollution in the study area.

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Impact of wastewater effluent on the diatom assemblages structure of a brackish small stream: Oued Hassar (Morocco)

Cited by 16 publications

References 5 publications

Indicator taxa of benthic diatom communities: a case study in Mediterranean streams

Indicator taxa of benthic diatom communities: a case study in Mediterranean streams

Can diatom-based pollution indices be used for biomonitoring in South Africa? A case study of the Crocodile West and Marico water management area

Spatio-temporal dynamics of land use practices on rivers in tropical regions: A case study of Ruiru and Ndarugu Basins, Kiambu County, Kenya

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