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Common tern Sterna hirundo breeding population : development and nature conservation management results at the Ormož wastewater basins between 1992 and 2002 (NE Slovenia) = Razvoj kolonije navadnih čiger Sterna hirundo in rezultati naravovarstvenega upravljanja v bazenih za odpadne vode pri Ormožu v obdobju 1992-2002 (SV Slovenija)Denac, DamijanA colony of Common Terns Sterna hirundo and Black-headed Gulls Larus ridibundus formed in 1981 in the wastewater basins of the sugar factory in Ormož. From than on, the colony has been monitored ... regularly by direct counting. The site was flooded in 1994 and, in 1995 and 1996, Common Terns andBlack-headed Gulls did not breed. In 1997> the first artificial breeding raft (surface area 12.5 m2) was placed, followed in 1998 and 2001 by additional rafts (14 m2 and 96 m2, respectively). All rafts were placed with the intention of preserving the Common Tern, since this species is highly endangded in Slovenia. As a result, the biggest mixed Common Tern and Black-headed Gull colony in Slovenia has been established on the artificial brecding rafts. In 2002, 64 pairs of Common Tern and 113 pairs of Blackheaded Gull bred on rafts, amounting to 45% and 50% respectively of the Slovene breeding population. Black-headed Gulls started to breed in higher numbers on the largest rafts, placed in 2001, and, for that reason, the percentage of Terns breeding on the rafts decreased. In 2000 all the Terns, but in 2001 only80% of those in the basins were breeding on rafts. It is most probable that the bigger rafts, with special breeding structures for Common Terns, weremore attractive for Black-headed Gulls. Obviously they liked thc heterogeneous raft surface, because they built their nests on the breeding structures planned to increase the breeding success of Common Terns.Source: Acrocephalus : glasilo Društva za opazovanje in proučevanje ptic Slovenije = journal of Bird Watching and Bird Study Association of Slovenia. - ISSN 0351-2851 (Letn. 23, št. 115, 2002, str. 163-168)Type of material - article, component partPublish date - 2002Language - englishCOBISS.SI-ID - 18726361
Author
Denac, Damijan
Topics
Birds |
Ecosystem |
Nesting Behavior |
Ekosistem |
Gnezdenje živali |
Ptice |
Lurus Ridibundus |
Sterna Hirudo |
Ormož
source: Acrocephalus : glasilo Društva za opazovanje in proučevanje ptic Slovenije = journal of Bird Watching and Bird Study Association of Slovenia. - ISSN 0351-2851 (Letn. 23, št. 115, 2002, str. 163-168)
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Denac, Damijan | 26009 |
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