Volume 48• Number 2• 2007

Abundance, species composition and age structure of gulls Laridae in the Gulf of Gdańsk area during non-breeding season.

Włodzimierz Meissner, Joanna Staniszewska, Szymon Bzoma

Abstract: From November to April of the seasons 2001/2002 and 2002/2003, twice a month gull surveys were undertaken in three places in the Gulf of Gdańsk area. During autumn and winter months, the Herring Gull Larus argentatus was the most abundant species at the rubbish dump in Szadółki (max. 11 907 inds, 83-91% of all gulls) and in the fishing harbour in Władysławowo (max. 2 052 inds, 76-85% of all gulls), followed by the Great Black-backed Gull L. marinus (max. 666 and 228 inds, respectively, up to 6.5%). The Black-headed Gull L. ridibundus occurred in low numbers during autumn and winter, but peaked in March-April (max. 3 355 in Szadółki and 1 589 inds in Władysławowo). The city beach held lower numbers of gulls in general. Herring and Black-headed Gulls were most numerous there during winter (max. 843 and 519 inds, respectively), and were closely followed by the Common Gull L. canus (19-22% of all gulls). Compared to the 1980s, numbers of wintering Black-headed Gulls declined sharply. Numbers of Herring Gulls increased evidently only at the rubbish dump, whereas in the remaining places the higher proportion of this species was caused by lower numbers of Black-headed Gulls. Similarly to the 1980s, adult Herring and Great Black-backed Gulls peaked in the area during late autumn and winter. Following their departure in spring, the most common age-class were first-winters. A similar pattern was found in the Black-headed Gull. First-winter Common Gulls were uncommon.



Abundance and distribution of the Mute Swan Cygnus olor in the Łódź region.

Radosław Włodarczyk, Tomasz Janiszewski

Abstract: In Łódź province local population of the Mute Swan was estimated on the level of 133 pair and 700-1500 non-breeders in years 1998-2006. The population size fluctuated annually without any noticeable trend. The number of birds was influenced by factors connected with reproduction, mortality and human activity within the water body occupied by swans. Thr breeding sites were mostly found in the northern part of study area, mainly in Warsaw-Berlin proglacial stream valley, where usually solitary pairs bred at fish ponds. Concentrations of breeding pairs were recorded only at dam reservoirs and larger fish ponds. Between 1999 and 2006 winter population of the Mute Swan was estimated for 350 to 790 birds, most of which (75-95%) wintered at the four largest rivers of the region (Warta, Pilica, Ner and Widawka).



Birds of the Skaryszewski Park in Warsaw in 1957-2006.

Maciej Luniak, Michał Lesisz, Andrzej Marciński, Wiesław Nowicki

Abstract: The Skaryszewski Park in the centre of Warsaw is an extensive (50 ha), nearly 100 year old park, visited by large numbers of people. Its tree stand is rich in holes, and there are ponds and large open grassy spaces. In the last 50 years, the avifauna of the breeding and winter seasons in the Park was investigated four times at 12-15 year intervals. While the habitat conditions for the Park's birds did not change much during this period, the extent of urbanization (development) of its immediate surroundings increased considerably. In breeding seasons 2004 and 2005, and in winter 2005/06, a total of 58-59 species were recorded in the Park, including 37 breeding or probably breeding ones and 32-33 species observed in winter. The density of the breeding population calculated for the entire Park area (50 ha) was similar in both years - 66 and 67 pairs/10 ha; that of the wintering birds was c. 80 ind./count/10 ha. Dominant among the breeding birds were hole nesters (11 species, 47% of the total number), and crown and high-bush nesters (14 spp. and 37% respectively). Among the overwintering birds, 18 regularly occurring species made up c. 90% of the total numbers. During the last 50 years the species richness and, probably, the abundance of birds in the Park did not change much, however 9 species that used to breed in the Park no longer did, mainly due to their general crisis in Warsaw, while 9 other species did became permanent breeders there, mostly as a result of synurbization. The abundance of species nesting on the ground and in low shrubs decreased by 2%, that of high nesting species - increased by 8%, and hole breeders decreased by 12%.



Rare birds recorded in Poland in 2006.

Komisja Faunistyczna

Summary: This report includes 439 accepted records from 2006, as well as 44 earlier ones, concerning 90 species and subspecies. No new species has been recorded for the first time in Poland. Highlights of the year were: the third record of the Ring-necked Duck Aythya collaris, the fourth of the Ruddy Duck Oxyura jamaicensis, Dalmatian Pelican Pelecanus crispus and Subalpine Warbler Sylvia cantillans, as well as the sixth and seventh of the Red-rumped Swallow Cecropis daurica. Occurrence of the following species is also noteworthy: three records of the Sociable Plover Vanellus gregarius and numerous records of: Pink-footed Goose Anser brachyrhynchus (53), Red-breasted Goose Branta ruficollis (13), Pygmy Cormorant Phalacrocorax pygmeus (16), Long-legged Buzzard Buteo rufinus (14), Pallid Harrier Circus macrourus (10), Dotterel Charadrius morinellus (10), and Arctic Redpoll Carduelis hornemanni (23).

Records of each species are first presented regionally in alphabetic order of the provinces, afterwards chronologically; they contain: date, number of individuals, sex and age (if known), documentation if present (photo, phono, video, specimen, etc.), location, district, and in brackets names up to three observers, further brief comments and references in some cases. The number codes following the species name mean: the first one - number of records slash number of individuals till 2005 inclusive, the second one - number of records slash number of individuals in 2006; "ca" means approximate number of records or individuals, "n" instead of a number - unknown number of those. The report includes an appendix (Aneks) containing records not accepted, and a list of revisions, i.e. reconsidered records.



Mixed brood of the Lesser Black-backed Gull Larus fuscus and Herring Gull L. argentatus at the Włocławek Reservoir.
Magdalena Zagalska-Neubauer, Grzegorz Neubauer

Summary: In April-June 2006 and 2007, a mixed pair of female Lesser Black-backed Gull and male Herring Gull bred and produced two chicks at the Włocławek Reservoir, central Poland. Subspecific identification of the female Lesser Black-backed Gull remains unresolved, due to lack of clear identification criteria, but it belongs to one of the pale-mantled subspecies - L. f. graellsii, L. f. intermedius or L. f. heuglini. It constitutes the third breeding record for Poland, after 15 years since previous breeding cases, first inland breeding in Poland and first record of breeding in a mixed pair. Accepted by the Avifaunistic Commission.



Asynchronous hatching in the Starling Sturnus vulgaris.
Bartłomiej Sklepowicz

Summary: In 2004-2005, the hatching strategy in the Starling breeding in nest-boxes was studied in the Ziemia Lubuska region (52°32'N, 15°28'E). Most often, the Starlings laid 5 eggs (67% of broods), the mean clutch size equalling 4.9 eggs (SD=0.7; N=21). In 95% of the broods (N=21) the young hatched asynchronously. In 81% of the nests with asynchronous hatching one nestling was younger than its siblings. Of the 98 nestlings hatched in the nests of asynchronous hatching (N=20 nests) two older nestlings and a single one younger in the brood of three different nests died. The three nestlings of the only synchronously hatching brood fledged successfully.



Wintering of waterfowl in the Bay of Gdańsk in the season 2005/2006.
Włodzimierz Meissner, Piotr Rydzkowski

Summary: The ice cover appeared in January. Till mid-March the ice covered the inner section of the Puck Bay from the Reda river mouth to Kuźnica village. In October large number of the Coot Fulica atra was noted. This species showed significant fluctuations in numbers during the last 22 years. Peak numbers of wintering Coots occurred at the turn of the 1980s and 1990s, when a few exceptionally mild winters appeared subsequently. In February the number of the Goldeneye Bucephala clangula reached 30 thousand. 22.7 thousand (76%) of which stayed in the mouth section of the Vistula river. This was the highest winter concentration of this species noted in Poland, which consisted of 5-7% of the European wintering population. Similarly to the previous seasons, the number of wintering Mute Swans Cygnus olor exceeded 5 thousand individuals, which is ca 2% of the population wintering in north-western Europe. The numbers of Goosanders Mergus merganser were also exceptionally large. The results indicate high importance of the western part of the Gulf of Gdańsk for wintering waterbirds. In February the coastal zone supported 91800 waterbirds, except gulls. The numbers of gulls at rubbish dumps lower than usual might be a result of organized human disturbance. The number of gulls along the coast remained stable and, with an exception in January 2004, fluctuated at the level of 7-8 thousand individuals.



Mystery bird 47: Laughing Gull Larus atricilla.
Jan Lontkowski




  Copyright © 2007, Notatki Ornitologiczne