خيارات البحث
النتائج 1 - 10 من 13
[The recent flora of vascular macrophyta in the "Vrbas-Bezdan" and "Banatska Palanka-Novi Becej" canals [Serbia, Yugoslavia] as indicator of ecological characteristics and water quality]
1997
Stojanovic, S. (Poljoprivredni fakultet, Novi Sad (Yugoslavia)) | Vuckovic, M. | Zderic, M. | Stankovic, Z. | Kilibarda, P. | Lazic, D.
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.
اظهر المزيد [+] اقل [-]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.
اظهر المزيد [+] اقل [-]Effect of geographical location on species composition, vegetation structure, diversity and phytoindicative characteristics in pine forests
1997
Roo-Zielinska, E. | Solon, J. (Institute of Geography and Spatial Organization, Polish Academy of Sciences, 00-818, Warsaw, Twarda 51/55 (Poland))
Polish mountain forests: past, present and future
1997
Grodzinska, K. | Szarek-Lukaszewska, G. (W. Szafer Institute of Botany, Polish Academy of Sciences, Lubicz 46, 31-512 Krakow (Poland))
Effects of ozone on managed pasture: 1. Effects of open-top chambers on microclimate, ozone flux, and plant growth
1994
Fuhrer, J. (Swiss Federal Research Station for Agricultural Chemistry and Environmental Hygiene, 3097 Liebefeld-Bern (Switzerland))
Sensitivity of a forest ecosystem model to climate parametrization schemes
1995
Fischlin, A. | Bugmann, H. | Gyalistras, D. (Systems Ecology, Institute of Terrestrial Ecology, Swiss Federal Institute of Technology (ETHZ), Grabenstr. 3, CH-8952 Schilieren/Zurich (Switzerland))
Contribution to the study of the macrophytic vegetation of the Semois river related to the global quality of the water and the aquatic environment
1995
Thoen, D. (Fondation Universitaire Luxembourgeoise, Arlon (Belgique)) | Roussel, L. | Nicolas, J.
Atrazine effects on the evolution of phytoplanktonic lakustrin populations
1995
Berard, A. (Institut National de la Recherche Agronomique, Thonon (France). Centre de Dijon, Institut de Limnologie) | Pelte, T.
Composition of the saprotrophic fungi in Danish heathland soil and the influence of ammonium nitrate application
1999
Johansson, M. (Copenhagen Univ. (Denmark))
