Issue 2021-2

Ornis Polonica 2021, 62: 89–100

The importance of the riverbeds of the largest rivers of the middle Vistula basin (central Poland) for breeding avifauna – changes after two decades

Andrzej Dombrowski, Sławomir Chmielewski, Dariusz Bukaciński, Krzysztof Antczak, Marek Murawski, Piotr Pagórski

Abstract: In 2007–2017 18 breeding species were counted in the river beds of the central Vistula and lower sections of the Narew, Bug, Pilica, Wkra and Liwiec rivers. The Sand Martin Riparia riparia (27,662–28,161 burrows) and the Black-headed Gull Chroicocephalus ridibundus (13,026–14,480 pairs) were the most abundant species. Other surveyed species were the Common Tern Sterna hirundo (1,636–1,798 pairs), Little Tern Sternula albifrons (460–531 p.), Mew Gull Larus canus (680–787 p.), Common Sandpiper Actitis hypoleucos (404–455 p.), Little Ringed Plover Charadrius dubius (242–304 p.), Goosander Mergus merganser (186–215 p.), Common Kingfisher Alcedo atthis (168–193 p.), Ringed Plover Ch. hiaticula (145–168 p.), Herring Gull L. argentatus sensu lato (78–111 p.), Mediterranean Gull Ichthyaetus melanocephalus (16–19 p.), Bluethroat Luscinia svecica (12–19 p.), Eurasian Oystercatcher Haematopus ostralegus (9–12 p.), Common Shelduck Tadorna tadorna (8–10 p.) and Lesser Black-backed Gull L. fuscus (5 p.). After two decades (1984–1993 vs 2017–2017), the abundance of ten species decreased, while the number of six increased. The largest increase concerned Goosander, Eurasian Oystercatcher and Caspian Gull L. cachinnans, as well as large gulls, while the largest decrease was observed in the Mew Gull, Bluethroat and Ringed Plover. The Stone Curlew Burhinus oedicnemus stopped nesting, and two species, the Lesser Black-backed Gull and Common Shelduck, started to breed. Despite a decreasing trend for many species, the central Vistula basin is still the most important national breeding ground for four species: Mew Gull, Ringed Plover, Eurasian Oystercatcher and Little Tern.

Key words: the middle Vistula basin, changes in the number of birds, breeding birds

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Ornis Polonica 2021, 62: 101–112

Woodpecker Picidae numbers in the Suchedniowskie Forest

Piotr Dębowski, Józef Dukała, Maciej Wachecki, Włodzimierz Szczepaniak, Grzegorz Stojek, Andrzej Staśkowiak, Łukasz Maślikowski

Abstract: The paper presents results of counts of woodpeckers Picidae conducted in 2020 in the central part of the Suchedniowskie Forests located on Kielce Upland. The study area of ca 2,940 ha was covered mainly by fir-beech and pine forests. Sound stimulation was used to detect the presence of woodpeckers. The density of Great Spotted Woodpecker Dendrocopos major was estimated on a survey plot of 365 ha. The density of stenotopic species was calculated per a total study area (landscape density) and per the area of one the preferred forest type (ecological density). We found six species of woodpeckers associated with the interior of mixed forests. The densities of woodpeckers were as follows: Great Spotted Woodpecker – 0.8 ter./10 ha, Black Woodpecker Dryocopus martius – 5.1 ter./10 km2 of the total area, White-backed Woodpecker Dendrocopos leucotos – 0.7 ter./10 km2 of the total area and 0.4 ter./km2 of deciduous forests, Middle Spotted Woodpecker Dendrocoptes medius – respectively 5.8–6.1 ter./10 km2 and 3.3–3.5 ter./km2, Grey-headed Woodpecker Picus canus – 3.5 ter./10 km2 and 0.7 ter./km2 , and Lesser Spotted Woodpecker Dryobates minor – 2.0–2.4 ter./10 km2 and 1.2–1.3 ter./km2. High diversity of woodpeckers in the Suchedniowskie Forests and the presence of stenotopic species, including the White-backed Woodpecker, suggest a relatively good conditions of these stands associated with large amounts of dead wood.

Key words: woodpeckers, Picidae, White-backed Woodpecker, Dendrocopos leucotos, fir-beech forests, the Suchedniowskie Forests, numbers

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Ornis Polonica 2021, 62: 113–148

Rare birds recorded in Poland in 2020

Komisja Faunistyczna

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Ornis Polonica 2021, 62: 149–155

Population of the Pygmy Owl Glaucidium passerinum in fragmented forests of the North Podlasie Lowland

Tomasz Tumiel, Paweł Białomyzy, Grzegorz Grygoruk, Oliwier Myka, Piotr Świętochowski

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Ornis Polonica 2021, 62: 156–162

Population trend of House Martins Delichon urbicum in Kielce

Maciej Wachecki, Piotr Wilniewczyc

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Ornis Polonica 2021, 62: 162–168

Changes in the breeding avifauna in the nature reserve “Świnia Góra” in the Świętokrzyskie Forest after 25 years

Marcin Mandziak, Piotr Wilniewczyc, Piotr Dębowski, Bogusław Sępioł

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