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Numbers and distribution of breeding population of the Great Egret Ardea alba in Poland

100%

Zbyryt A.

Ornis Polonica

2019

tom 60

nr 4

Research on the distribution and abundance of the breeding population of the Great Egret Ardea alba was carried out using an unmanned aerial vehicle (drone) in eastern Poland (east of the Vistula river) in 2018. Data from western Poland (west of the Vistula river) came from reports of the Polish Avifaunistic Commission and local observers. As only single pairs nested in western Poland, a detailed description and analysis of breeding sites have been made only for eastern Poland. In total, 496 breeding pairs were recorded in 8 colonies hosting from 13 to 248 pairs (mean = 62; SD=77; Me=40) in eastern Poland. Surveyed heronries were located on shrubs in wetlands (50%), in reedbeds (37.8%), in a young pine stand and on bushes on a lake island. In total 5 mixed colonies, where Great Egrets nested together with the Grey Heron A. cinerea or with the Grey Heron and the Great Cormorant Phalacrocorax carbo (one case), were recorded. The average distance between the Great Egret colonies and human settlements was 989 m (range: 63–3700; SD=441; Me=1245). The average distance of mixed colonies of the Great Egret and the Grey Heron to human settlements (909 m) was lower compared to single species colonies of the Great Egret (1227 m). A colony on Lake Gaładuś (248 pairs; about 50% the national population) and surrounding feeding grounds deserve protection as the SPA Natura 2000. In 2018 the breeding population of the Great Egret in eastern Poland probably included almost the entire Polish population of this species, as only 2 pairs were recorded in the western part of the country. Therefore it can be assumed that the national population of the Great Egret amounted to 498 pairs in 2018. It is postulated that Polish monitoring of the Great Egret breeding population planned to be launched in 2020 within the framework of Polish Birds Monitoring should be conducted with the use of drones, which are an efficient tool for the detection and inventory of breeding sites of this species.

Ograniczanie wyników

1 Ornis Polonica

1 Zbyryt A.

1 2019

Wyniki wyszukiwania

Numbers and distribution of breeding population of the Great Egret Ardea alba in Poland