Jelentés a Gönyű-Szob közti Duna-szakasz (1791 – 1708 fkm) 2022. augusztus – 2023. április időszakának vízimadár felméréseiről

• Published in: Magyar Vízivad Közlemények
• Main Author: Faragó, Sándor
• Format: Article in Journal/Newspaper
• Language: Hungarian
• Published: 2023
• Subjects: Gavia arctica; Haliaeetus albicilla; Larus canus; Melanitta fusca; Mergellus albellus; Sterna hirundo; Chroicocephalus ridibundus
• Online Access: http://publicatio.uni-sopron.hu/3234/; https://doi.org/10.17242/MVvK_37.18; http://publicatio.uni-sopron.hu/3234/1/magyar-vizivad-kozlemenyek-2023-37-305-311.pdf

Report on the waterbird censuses of Danube River between Gönyű and Szob (River kms 1791 – 1708) during the period August 2022 and April 2023. Based on the results of the waterfowl counts (shown in Tables 2 and 3) completed during the 2022/2023 season in the section between Gönyű and Szob of the Danube river, we recorded the largest number of waterbirds (n=13 496) in December, while the smallest total number of birds occurred in September (n=478). The daily water level of the Danube River on the observation days shows Table 1. We observed the highest number of species (24 species) in December, while in September we saw only 8 species. During the 9-month study, we observed 30 species. Species that only appeared occasionally or in small numbers (˂100 per observation) included Cygnus olor (max. 64), Melanitta fusca (max. 1), Mergellus albellus (max. 26), Mergus serrator (max. 2), Aythya ferina (max. 24), Spatula clypeata (max. 4), Mareca penelope (max. 18), Gavia arctica (max. 1), Tachybaptus ruficollis (max. 9), Podiceps cristatus (max. 19), Fulica atra (max. 7), Egretta garzetta (max. 14), Ardea alba (max. 80), Aquila heliaca (max. 4), Haliaeetus albicilla (max. 6), Larus cachinnans (max. 8), Sterna hirundo (max. 2) and Alcedo atthis (max. 2). Species that appeared in larger numbers and quantities (˃100 per observation) were as follows: Anser anser: 0–580, Anser albifrons: 0–1780, Anas platyrhynchos: 14–5282, Anas crecca: 0–130, Phalacrocorax carbo: 131–1463, Bucephala clangula: 0–980, Chroicocephalus ridibundus: 0–2665, Larus canus: 0–2425, Aythya fuligula: 0–386 and Larus michahellis: 3–872. Figures 1 present the dynamics of common species. There are 3 known Great Cormorant nesting colonies in the studied section of the Danube; in 2023, 335–390 pairs nested there. There were 118–145 pairs of Grey Heron (Ardea cinerea) which, like the Great Cormorant, also nests in 3 colonies. There are also four known White-tailed Eagles (Haliaeetus albicilla) nests in the section of the Danube (Nagy-Erebe Island, Komárom Szt. ...