Refinar búsqueda
Resultados 1-10 de 24
Diffuse urban pollution increases metal tolerance of natural heterotrophic biofilms
2012
Fechner, L.C. | Gourlay-Francé, C. | Bourgeault, A. | Tusseau-Vuillemin, M.H. | AgroParisTech | Hydrosystèmes et Bioprocédés (UR HBAN) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | Laboratoire d’Oéanographie Spatiale [Plouzané] (LOS) ; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)
[Departement_IRSTEA]Eaux [TR1_IRSTEA]BELCA | This study is a first attempt to investigate the impact of urban contamination on metal tolerance of heterotrophic river biofilms using a short-term test based on β-glucosidase activity. Tolerance levels to Cu, Cd, Zn, Ni and Pb were evaluated for biofilms collected at three sites along an urban gradient in the Seine river (France). Metallic pollution increased along the river, but concentrations remained low compared to environmental quality standards. Biofilm metal tolerance increased downstream from the urban area. Multivariate analysis confirmed the correlation between tolerance and contamination and between multi-metallic and physico-chemical gradients. Therefore, tolerance levels have to be interpreted in relation to the whole chemical and physical characteristics and not solely metal exposure. We conclude that community tolerance is a sensitive biological response to urban pressure and that mixtures of contaminants at levels lower than quality standards might have a significant impact on periphytic communities.
Mostrar más [+] Menos [-]Determination of chemical composition of natural waters on the territory of some townships of the central Serbia [Yugoslavia]
1998
Mihajlovic, R. | Plavsic, K. | Mihajlovic, Lj. | Mrdak, C. | Kovacevic, S. | Kanazir, Lj. (Prirodno-matematicki fakultet, Kragujevac (Yugoslavia))
In this paper the results of determination of natural waters from the territory of the township Smederevska Palanka and Rekovac (Serbia, Yugoslavia) are presented. The content of metals in waters was determined by the AAS method and other parameters were determined by spectrophotometric and potentiometric method.
Mostrar más [+] Menos [-]Bottom fauna of Susica fountainhead [Serbia, Yugoslavia]
1998
Markovic, Z. | Mitrovic-Tutundzic, V. (Univerzitet u Beogradu, Beograd - Zemun (Yugoslavia). Poljoprivredni fakultet, Institut za stocarstvo)
During the 1994-1995, seasonal investigations of the fountainhead and spring region of the river Susica, near Uzice in West Serbia (Yugoslavia) were carried out. The bottom fauna composition, termic properties of air and water as well as chemical parameters were also determined. By the study of bottom composition 26 taxa were determined. The most uniform fauna was found in the Susica fountainhead while its diversity was increasing farther downstream the spring region.
Mostrar más [+] Menos [-]Metal-pollution index (MPI) - proposal for freshwater monitoring
1999
Teodorovic, I. (Univerzitet u Novom Sadu, Novi Sad (Yugoslavia). Prirodno-matematicki fakultet, Institut za biologiju) | Djukic, N. | Maletin, S. | Miljanovic, B.
MPI - Metal Pollution Index is being proposed with an aim improving the freshwater pollution control, monitoring and classification based on fish metal body burden. This is a simple mathematical model which enables presentation of Cd, Pb, Cu, Zn and Al fish liver concentration as a single value. After thorough studies of bioaccumulation, biomagnification and tissue distribution patterns, liver of Carassius auratus gibelio has been chosen as sentinel organ. Normal distribution and biological variation assessment is being achieved by using normalizers - reference values (liver concentrations of selected elements in fish from reference sites Vruje and Moharac micro water reservoirs, Serbia (Yugoslavia)). Selected representative sites have been evaluated according to new classification of freshwater ecosystem based on MPI values.
Mostrar más [+] Menos [-]On the design and use of a fresh water sampling apparatus to concentrate and extract organic micropollutants on a continuous basis
1991
Turcotte, J. (Universite Laval, Quebec (Canada). Faculte des Sciences et de Genie, Departement de Chimie) | Cote, J.E. | Fraser, E.
Nitrogen in Dutch freshwater lakes: trends and targets
1998
Molen, D.T. van der | Portielje, R. | Nobel, W.T. de | Boers, P.C.M. (Institute for Inland Water Management and Waste Water Treatment, Lelystad (Netherlands))
Temporal trends of organochlorines in northern Europe, 1967-1995. Relation to global fractionation, leakage from sediments and international measures
1998
Bignert, A. | Olsson, M. | Persson, W. | Jensen, S. | Zakrisson, S. | Litzen, K. | Eriksson, U. | Haggberg, L. | Alsberg, T. (Contaminant Research Group, Swedish Museum of Natural History Box 50007, SE-104 05 Stockholm (Sweden))
The effects of acidification on the geochemistry of Al, Cd, Pb and Hg in freshwater environments: a literature review
1991
Nelson, W.O. | Campbell, P.G.C. (Univ. Quebec, Inst. National de la Recherche Scientifique, Sainte-Foy, Quebec G1V 4C7 (Canada))
Review of the biological studies on Laguna de Bay [Philippines] in relation to aquatic pollution
1997
Guerrero, R.D. III (Philippine Council for Aquatic Marine Research and Development, Los Banos, Laguna (Philippines))
Laguna de Bay is the largest freshwater body in the Philippines with multiple-use. The primary use of the lake is to serve as the future domestic water supply at Metro Manila. The biota of the lake consists of 25 species of fish, 24 species of zooplankton, two species of shrimps, 6 species of mollusks, 42 species of aquatic macrophytes and 154 species of algae. A total of 60 mesophilic anaerobic and facultative anaereobic bacteria and 453 bacterial strains belonging to 22 genera have been identified. A review of 12 papers dealing with biological studies on Laguna de Bay in relation to aquatic pollution is presented. Studies on the impact of heavy metal, pesticide and thermal pollution on the biota of the lake have been sporadic and cursory. There is need for a more comprehensive and systematic monitoring of the lake's pollutants to provide time-series for pollution abatement
Mostrar más [+] Menos [-]Freshwaters.. ed. 2
1992
Fish, Sir H. (Red Roofs, Newbury Road, Shefford Woodlands, Newbury, Berkshire RG16 7AJ (United Kingdom))