<abstract xmlns="http://www.w3.org/1999/xhtml"><p>During the years 2003-2010, the numbers of pairs of waterbird species breeding in the city of Wrocław (293 km<sup>2</sup>) were assessed. The city is situated in Odra valley, where four smaller rivers join it. The city abandons in oxbows, gravel and sand, and clay pits and other water bodies. In total, 20 waterbird species were recorded as breeding in Wrocław. The most common were <italic>Anas platyrhynchos</italic> (145-212 pairs), and <italic>Fulica atra</italic> (70-104 pairs). Relatively common were also the <italic>Gallinula chloropus</italic> (28-37 pairs), <italic>Rallus aquaticus</italic> (9-25 pairs) and <italic>Cygnus olor</italic> (9-11 pairs). For each remaining species less than 10 pairs were recorded. Among rare species, the following were recorded as breeding in Wrocław: <italic>Grus grus, Mergus merganser</italic>, and <italic>Porzana porzana</italic>. In the few recent decades, the increase in the number of breeding pairs was recorded for <italic>Anas platyrhynchos</italic> and <italic>Cygnus olor</italic>; while a parallel decrease was recorded for <italic>Fulica atra, Gallunula chloropus, Chroicocephalus ridibudnus</italic>, and <italic>Tachybaptus ruficollis</italic>. Species such as the <italic>Aythya fuligula, Aythya ferrina</italic>, grebes, gulls and terns avoid the city. Some of them even ceased to breed (<italic>Anas quarquedula, Anas clypeata</italic> and <italic>Botaurus stellaris</italic>). The city plays an important role in protecting water bird species such as <italic>Grus grus, Cygnus olor, Porzana porzana</italic> and <italic>Alcedo atthis</italic>.</p></abstract>

During the years 2003-2010, the numbers of pairs of waterbird species breeding in the city of Wrocław (293 km2) were assessed. The city is situated in Odra valley, where four smaller rivers join it. The city abandons in oxbows, gravel and sand, and clay pits and other water bodies. In total, 20 waterbird species were recorded as breeding in Wrocław. The most common were Anas platyrhynchos (145-212 pairs), and Fulica atra (70-104 pairs). Relatively common were also the Gallinula chloropus (28-37 pairs), Rallus aquaticus (9-25 pairs) and Cygnus olor (9-11 pairs). For each remaining species less than 10 pairs were recorded. Among rare species, the following were recorded as breeding in Wrocław: Grus grus, Mergus merganser, and Porzana porzana. In the few recent decades, the increase in the number of breeding pairs was recorded for Anas platyrhynchos and Cygnus olor; while a parallel decrease was recorded for Fulica atra, Gallunula chloropus, Chroicocephalus ridibudnus, and Tachybaptus ruficollis. Species such as the Aythya fuligula, Aythya ferrina, grebes, gulls and terns avoid the city. Some of them even ceased to breed (Anas quarquedula, Anas clypeata and Botaurus stellaris). The city plays an important role in protecting water bird species such as Grus grus, Cygnus olor, Porzana porzana and Alcedo atthis.

Distribution and numbers of waterbird species breeding in the city of Wrocław

Wrocław University of Environmental & Life Sciences

Acta Musei Silesiae, Scientiae Naturales

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Distribution and numbers of waterbird species breeding in the city of Wrocław"}

During the years 2003-2010, the numbers of pairs of waterbird species breeding in the city of Wrocław (293 km2) were assessed. The city is situated in Odra...

Distribution and numbers of waterbird species breeding in the city of Wrocław

Online veröffentlicht: 11. Okt. 2020

Seitenbereich: 175 - 180

DOI: https://doi.org/10.2478/cszma-2020-0013

Schlüsselwörter
urban ornithology, waterbirds, censuses, nature conservation

© 2020 Grzegorz Kopij, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Distribution and numbers of waterbird species breeding in the city of Wrocław

Online veröffentlicht: 11. Okt. 2020

Seitenbereich: 175 - 180

DOI: https://doi.org/10.2478/cszma-2020-0013

Schlüsselwörterurban ornithology, waterbirds, censuses, nature conservation

© 2020 Grzegorz Kopij, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Schlüsselwörter
urban ornithology, waterbirds, censuses, nature conservation