Affiner votre recherche
Résultats 1-7 de 7
Algological and saprobiological analysis of the river Dulenska [Serbia, Yugoslavia]
1997
Rankovic, B. | Simic, S. (Prirodno-matematicki fakultet, Kragujevac (Yugoslavia). Institut za biologiju)
During hydrobiological investigations of the river Dulenska (Serbia, Yugoslavia) in June 1996, algological samples were taken at this river. In the algae community are found 34 taxa from two divisio: Bacillariophyta (28) and Chlorophyta (6). While qualitative composition of the algae colony was relativelly uniformed quantitative one was changeable along the course of the Dulenska river. By saprobiological analysis, it was found that the quality of water was changing along the course of the river. At the upper and middle course of river the water belonging to the second class. At lower course of the river (below Rekovac) water quality was getfing worse and it belonging to the third class.
Afficher plus [+] Moins [-]The importance of some members of biocenosis in protecting the ecological balance on the preserved ecosystem Obedska bara [Serbia, Yugoslavia]
1997
Ratajac, R. (Poljoprivredni fakultet, Novi Sad (Yugoslavia)) | Rajkovic, D. | Stojkovic, S. | Bobic, M. | Cokic, S.
The investigations have been done in Krstonosica shaft at 3 points, in February, May and October 1995, and in January and April 1996. They included algae, Rotatoria, Copepoda, Cladocera, and Hydracarina. The species from divisio Bacillariophyta were presented most among the algal species, with 56 species, then from divisio Chlorophyta, with 26 taxons, Euglenophyta 11, Cyanobacteria 9, Pyrrophyta 3, Xanthophyta 2 and Chrysophyta 1. Among animal groups the highest number belonged to the Rotatoria group, 111 taxons have been determined. The highest number was found during autumn season (86), then in spring (73), and only 14 species in winter. The species that mostly prevailed were phytophyl species. The Cladocera group was present with 18 taxons. The phytophyl species from overgrown plants again prevailed. The Copepoda group was present with 10 species and the phytophyl species were prevailed. According to saprobiological characteristics the greatest number belongs to beta-mezosaprobionts, then oligosaprobionts. A small number of species indicates to the eutrophication process and organic pollution of water.
Afficher plus [+] Moins [-][Detection of degradation products using chemical and biological methods [intrinsic bioremediation]]
1997
Dyreborg, S.
Biological variation in sensitivity to N-heterocyclic PAHs; effects of acridine on seven species of micro-algae
1997
Dijkman, N.A. | Vlaardingen, P.L.A. van | Admiraal, W.A. (Amsterdam Research Institute for Substances in Ecosystems (ARISE), University of Amsterdam, Department of Aquatic Exotoxicology, Kruislaan 320, 1098 SM, Amsterdam (Netherlands))
Effect of copper smelting air pollution on the mites (Acari) associated with young Scots pine forests polluted by a copper smelting works at Giogów,Poland. I. Arboreal mites
1997
Seniczak, Stanisław | Dąbrowski, Janusz | DŁUGOSZ, JACEK
The arboreal mites and epiphytes in young Scots pine forests (plant association Leucobryo-Pinetum) polluted by a copper smelting works at Głogów, were investigated. The concentration of heavy metals in Scots pine bark and epiphytes increased towards the pollution source. Copper was accumulated mainly by algae, but lead was accumulated mainly by lichens; these epiphytes accumulated more heavy metals than tree bark. A high concentration of heavy metals was harmful to mites, especially to Oribatida, and to lichens, but algae tolerated these pollutants. The number of oribatid species decreased towards the pollution source, along with the increasing concentrations of heavy metals in tree bark and epiphytes. Among mites, the following categories were distinguished: a) sensitive to heavy metals, b) sensitive to a high concentration but tolerant of small concentrations and c) tolerant of these metals. The mites inhabited mainly the lower section of trees.
Afficher plus [+] Moins [-]Occurrence of the marine antifouling agent Irgarol 1051 within the Plymouth Sound locality: implications for the green macroalga Enteromorpha intestinalis
1997
Scarlett, A. | Donkin, M.E. | Fileman, T.W. | Donkin, P. (Plymouth Environmental Research Centre, University of Plymouth, Drake Circus, Plymouth, Devon PL4 8AA (United Kingdom))
Effect of copper smelting air pollution on the mites (Acari) associated with young Scots pine forests polluted by a copper smelting works at Giogow, Poland. 1. Arboreal mites
1997
Seniczak, S. (University of Technology and Agriculture, Bydgoszcz (Poland). Dept. of Ecology) | Dabrowski, J. | Dlugosz, J.