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001-es BibID:BIBFORM092928
Első szerző:Gyüre Péter (agrármérnök)
Cím:Population dynamics of the great cormorant (phalacrocorax carbo) in the fishponds of Hortobágy / Gyüre Péter, Juhász Lajos
Megjegyzések:The Hortobágy is the first national park in Hungary established in 1973. The landscape is dominated by grasslands and wetlands in the deeper areas. After the river regulation works of the Tisza river, the area was dried out in the 19th century. Several artificial fishponds were created in the middle of the 20th century, the fishponds are giving a suitable wetland habitat for birds. The Hortobágy has a great importance in breeding, migrating and wintering of about 350 bird species. There are several endangered and rare bird species breeding in the fishponds, for example Spoonbill (Platalea leucorodia), Great White Egret (Egretta alba), Glossy Ibis (Plegadis falcinellus), Pygmy Cormorant (Phalacrocorax pygmaeus), Whiskered Tern (Chlidonias hybrius). The migrating species including the Lesser White-fronted Goose (Anser erythropus), Red-breasted Goose (Branta ruficollis) and the fishponds are the main resting place for more than hundred thousand Eurasian Cranes (Grus grus) in autumn migration. The extensive ecological fish management by the Hortobágy Fish Farm Company in the cooperation with the Hortobágy National Park provide a favourable breeding condition for the breeding and migrating bird species. The population of the Great Cormorant (Phalacrocorax carbo) was very low in Hungary before the 1980s. After this period, the breeding and migrating number increased significantly in the wetlands of Hungary but also in most European countries. The size of the Great Cormorant breeding population in the Hortobágy area is relatively stable but the migrating and wintering number has increased in recent years. Due to considerable fish consumption by cormorants, adequate protection was applied. It is essential to know, which pond units and what categories of ponds (fish rearing, growing and fattening) are preferred by the birds. Different bird scaring methods applied in the lakes, and there are protected bird feeder lakes managed by the national park. Our data was examined according to continuous population monitoring. We found out that the population of the cormorant depends on the feeding possibilities and the fish size composition of the ponds, and the fish consumption is different in each season
Tárgyszavak:Természettudományok Biológiai tudományok előadáskivonat
Megjelenés:34th IUGB Congress: Wildlife: Coexistence or Opposite : Book of Extended Abstracts. - p. 69
További szerzők:Juhász Lajos (1956-) (biológia-földrajz szakos tanár)
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