Algological data on the upper reach of river Tisa
The waters of the Eastern half of the Carpathian basin are collected and carried into the Danube by River Tisa. The catchment area of the river is about 150,000 sq.km and the river is approximately 1,000 km long. The upper reach of the river is 266 km long, measured from the sources (in Ukraine) to...
Elmentve itt :
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| Dokumentumtípus: | Könyv része |
| Megjelent: |
1999
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| Sorozat: | Tiscia monograph series
The Upper Tisa valley : preparatory proposal for Ramsar site designation and an ecological background Hungarian, Romanian, Slovakian and Ukrainian co-operation |
| Kulcsszavak: | Tisza - élővilág, Felső-Tisza-vidék - ökológia |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/10209 |
| Tartalmi kivonat: | The waters of the Eastern half of the Carpathian basin are collected and carried into the Danube by River Tisa. The catchment area of the river is about 150,000 sq.km and the river is approximately 1,000 km long. The upper reach of the river is 266 km long, measured from the sources (in Ukraine) to the confluence with River Szamos (one of its largest tributaries), in Hungary. The bottom of the Carpathian basin was formed by alluvial deposition created by the river. Deposits were discharged from the surrounding mountains into the Tertiary Pannonian Sea which had been filled by the beginning of the Pleistocene. River Tisa has an important role in the sedimental deposition of the Basin. The highest section of the Upper Tisa is a typical mountainous region with stony bed, while the next section is in a hilly environment, with gravel bed. The dynamism of water discharge is considerable, thus there is a great difference in the ecological conditions between waves of flooding and low water outflow. The river's suspended matter content is extremely high, especially at the time of the floods; therefore its popular name is 'Fair Tisa'. Algae play an important role in riverine ecosystems: they produce oxygen, serve as food for animals, and indicate conditions of and changes in the environment. At sites near the source and in the upper sections of rivers, attached algae (periphyton) are found subsurface as inhabitants of the planktonic environment (pseudoplankton, tychoplankton). Due to both the high velocity of water flow in the upper sections of river basins, and the high turbidity caused by inorganic particles, diatoms are the main group of algae. A decrease in velocity and/or an increasing nutrient load can lead to the dominance of other groups of algae (for example green algae). In the middle and lower sections of rivers real planktonic algae (potamoplankton) can become increasingly dominant. The first reports on algae in the Ukrainian section of the Upper Tisa region were provided by Szabados, and the Hungarian section was observed by Uherkovich (1971). Hamar (in Adamosi et al. 1977, Hamar 1991) studied the algological structure of the Hungarian reach. |
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| Terjedelem/Fizikai jellemzők: | 355-360 |
| ISSN: | 1418-0448 |