خيارات البحث
النتائج 1 - 7 من 7
The establishing of ichthyological status of the Nisava river (Serbia, Yugoslavia) with special review of fishes' hematology
1998
Brankovic, S. (Fakultet zastite na radu, Nis (Yugoslavia)) | Ciric, B. | Stankovic, M.
Biosystematic research of fish population from the river Nisava (Serbia, Yugoslavia) is placed from the mouth of Jerma river and Nisava river to the mouth of Nisava river and Juzna Morava river (Serbia, Yugoslavia). The next part of the research is about determining the methodology for counting of particular fish species in the river Nisava. Hematological analyses of some species were done at the same time in order to establish the relation between water quality and number of erythrocytes, leucocytes and quantity of haemoglobin. Two autochthonous and allochthonous species were analyzed. The method used in this research are explained as well.
اظهر المزيد [+] اقل [-]Can air pollution influence spruce bark beetle populations in the Central European mountains?
2002
Turcani, M. (Forest Research Institute, Banska Stiavnica (Slovak Republic). Forest Station) | Grodzki, W. | Fleischer, P. | Novotny, J.
Bark beetle populations were estimated periodically each year in 50 ha plots using a series of pheromone traps and through the dissection of 0.5 m sections of infested trees. Data were recorded on several parameters including the volume of infested trees, captures in pheromone traps, number of attacks, and the presence and relative abundance of related bark beetle species. In the period 2000-2001 3 transects were established in the High Tatra Mts., where captures in pheromone traps were recorded and compared with air pollution represented by ozone
اظهر المزيد [+] اقل [-]Impact of oil pollution on seabirds
1984
Clark, R.B.
Ecological effects of acidification on tertiary consumers; fish population responses
1986
Rosseland, B.O. (Directorate for Nature and Management, Trondheim (Norway). Fish Research Div.)
Changes in fish populations in southernmost Norway during the last decade
1986
Sevaldrud, I.H. (Directorate for Nature and Management, Trondheim (Norway). Fish Research Div.) | Skogheim, O.K.
The importance of protection of the belt of stoneworts for the surviving of the benthic macroinvertebrate communities from Lake Ohrid
2003
Trajanovski, S. | Trajanovska, S. | Budzakoska, B. (Hidrobioloski zavod, Ohrid (The Former Yugoslav Republic of Macedonia))
The most extended and deepest belt of macrophytic vegetation, the belt which almost without exceptions define the lower limit of littoral region of Lake Ohrid, consists algae from the family Characeae. Permanent presence of sunlight, well oxygen saturation, their density which decreases the waves action, together with the facts that these algae are food and shelter for the numerous endemorelic species from the very rich fauna of macro invertebrates, make the stonworts the most attractive life habitat in Lake Ohrid. Our results are found on researching of three types facies from four different localities in Lake Ohrid: sandy-muddy facies without of stoneworts, facies covered by stoneworts and facies covered by Gastropod and Bivalvia shells, also without of stoneworts. Without exceptions, in all four localities we approved the mentioned affirmation about the great importance of the stoneworms as life habitats, both by the number of present taxa and the density of the macro invertebrate communities.
اظهر المزيد [+] اقل [-]Amphibians and reptiles communities in the forest habitats affected by air polluants
1995
Homolka, M. (Akademie Ved, Brno (Czech Republic). Ustav Ekologie Krajiny) | Kokes, J.