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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Number and distribution of Corncrakes Crex crex in Ukraine in the 2000s (2016)
Auteurs :	Andrey A. Atemasov, Auteur ; Igor M. Gorban, Auteur ; Oleg V. Dudkin, Auteur ; Oleksandr Y. Mykytiuk, Auteur ; Sergiy V. Domashevskiy, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (136(2-3, Sp. Iss.) 2016)
Article en page(s) :	145-152
Résumé :	Until 2000, there was no special nationwide survey of Corncrake in Ukraine. In 2000-2002 we carried out such Corncrake inventory. 377 plots were surveyed during the fieldwork. The total area of all census plots was 203,754 ha. This constitutes about 0.42 % of the total area suitable for breeding Corncrakes in Ukraine. Stratified selection method was applied to identify the optimum number of plots for each type of habitat and the total number of plots. Census plots were chosen randomly using the vegetation map of Ukraine. The census was carried out through direct counting of the number of calling males in selected sample plots twice during the breeding season. The total numbers of Corncrake was estimated at about 127,000 males in 2000 and 102,000 males in 2001. This is higher than the population size estimated for Ukraine earlier. Obviously, this is not an actual population increase but rather a more precise estimation based on a whole range inventory in Ukraine, which had never been done before. At the same time, figures in the literature were based on rough estimations rather than on reliable census data.Floodplain meadows are the most important habitats supporting the largest number of Corncrakes (45-68,000, or 45-54 % of the Ukrainian population). The highest density was observed in floodplain meadows in the forest zone (about 2-3 calling males/km(2) on average, maximum 40 calling males/km(2)). Although Corncrake population density is usually low in agricultural landscapes, the total population number in this habitat is considerable with accounting for high percentage of agricultural land area in Ukraine.Corncrake population distribution in Ukraine is not random. The key areas are the northern and north-western parts of the forest zone (Volyn, Rivne and Chernihiv regions) where large numbers and high population densities are observed. These areas are characterized by conditions favourable for Corncrake: low proportion of arable lands; significant proportion of relatively wet and extensively exploited meadows; well-developed system of drainage and irrigation ditches as well as availability of relatively large areas which are irregularly or scarcely used for agriculture.

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