Distribution, population size and dynamics of the white stork (ciconia ciconia L.) in the upper and middle Olt river basin (Romania)
Based on the results of the censuses carried out between 1996-2000, the total population of the Upper and Middle Olt River Basin is 721 HPa distributed in 304 localities. The total population of the region can be estimated to approx. 800 HPa. About 30% of Transylvanian population and about 16% of Ro...
Elmentve itt :
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| Dokumentumtípus: | Könyv része |
| Megjelent: |
2002
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| Sorozat: | Tiscia monograph series
Ecological aspects of the Tisa River Basin : 10 years anniversary regional conference 21nd - 24th March 2002., Târgu Mureş, Romania |
| Kulcsszavak: | Olt folyó - élővilág, Olt völgye |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/10269 |
| Tartalmi kivonat: | Based on the results of the censuses carried out between 1996-2000, the total population of the Upper and Middle Olt River Basin is 721 HPa distributed in 304 localities. The total population of the region can be estimated to approx. 800 HPa. About 30% of Transylvanian population and about 16% of Romanian population breeds in the study area. From a vulnerability, conservational and monitoring point of view it is important to note that ~10% of the localities hold almost half (328 HPa - 45.49%) of the total breeding population of the whole area. The mean population density (StD) for the whole area was 5.469 HPa/100 km2 . Out of a total of 721 breeding pairs, 64% were found to nest at altitudes between 500-1000 in and only 36% nests within the altitudinal belt of 300-500 m. Most common nest sites are electric pylons (45.26%), barns (24.47%) and chimneys (22.48%). Since the 1960-s massive changes have been observed in nest site preferences, from buildings to electric pylons. The mean JZa and JZm values for the Upper and Middle Olt River Basin were above 2.0 and 2.5 in 1998-2000. values which arc higher than the estimated JZa and JZm values needed to keep the population stable. The White Stork population of the Middle and Upper Olt River Basir. has undergone a continuous decrease from the sixties until the end of the nineties. Positive populational changes can be seen, with the exception of the Fágára? Basin, only in the ¡988/1989-2000 period: the population has recovered to the level of the sixties and is still increasing in the Ciuc, Tárgu Sccuiesc and Sibiu Basins. |
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| Terjedelem/Fizikai jellemzők: | 205-233 |
| ISSN: | 1418-0448 |