Jelentés a Gönyű-Szob közti Duna-szakasz (1791 – 1708 fkm) 2022. augusztus – 2023. április időszakának vízimadár felméréseiről = Report on the Waterbird Censuses of Danube River Between Gönyű and Szob (River kms 1791 – 1708) During the Period August 2022 and April 2023

Faragó, Sándor (2023) Jelentés a Gönyű-Szob közti Duna-szakasz (1791 – 1708 fkm) 2022. augusztus – 2023. április időszakának vízimadár felméréseiről = Report on the Waterbird Censuses of Danube River Between Gönyű and Szob (River kms 1791 – 1708) During the Period August 2022 and April 2023. MAGYAR VÍZIVAD KÖZLEMÉNYEK = HUNGARIAN WATERFOWL PUBLICATIONS, 37. pp. 305-311. ISSN 1416-1389 (nyomtatott); 1419-6107 (elektronikus)

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Abstract

Jelen dolgozat a MAGYAR VÍZIVAD MONITORING (MVvM) megfigyelési egységeként nyilvántartott Gönyű és Szob közötti Duna szakasza valamennyi vízimadárfajjal kibővített számlálásainak eredményeiről a 41. vizsgálati időszak alapján ad jelentést [a részletes előzmény 30 éves (1982/1983–2011/2012) összefoglalóját lásd FARAGÓ, 2016a, a jelen jelentést megelőző 10 (31-40.) idényét FARAGÓ 2015a, 2015b, 2016b, 2016c, 2017, 2022a, 2022b, 2022c, 2023a és 2023b közleményeiben). 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. Pál Island, Szőnyi Island and Mocsi Island); booth nests were inhabited in 2023 and breeding were as well. One pair of Imperial Eagle (Aquila heliaca) breeding at Neszmély on Radvány Island were still present during the nesting, but in the spring the stormy wind severely damaged the nest.

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