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The influence of management of meadows ecosystems on the occurrence of male of corncrake (Crex crex) in the selected part of the Šumava National Park and Protected Landscape Area
PEKSA, Martin
The aim of this work was to monitor the occurrence of males of corncrake (Crex crex) in the western part of the Šumava National Park and Protected Landscape Area and to find out the effect of meadows ecosystems management on its occurrence. The method of night counting of singing males of corncrake with the help of method of point transect was practised. Male territorial vocalization audio record was used as well. The monitoring lasted for the nesting season of corncrake from 2008 to 2010. The average altitude of studied localities was 879.57 metres above sea-level. Seventy four localities were studied. Corncrake preferred ungrazed and unfertilized perennial grasslands harvested after 15th July. It also preferred temporarily and permanently waterlogged localities. The localities grazed by farm animals affected the occurrence of corncrake negatively. The decrease in number of males was observed from 2008 to 2010 on studied localities. The numbers were even 61,5 % lower. From the above mentioned data it can be concluded that the best management as regards the occurrence of corncrake is ungrazed and unfertilized perennial grassland with late time of harvesting in the case of not fitting into an agroenvironmental programme protecting the corncrake.
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Occurence and density of corncrake (Crex crex) in selected parts of National Park Šumava in relation to biotope management
PEKSA, Martin
The abundance of males of corncrake (Crex crex) in dependence on its biotope management was studied in the west part of the Šumava National Park. A night counting of singing males of corncrake by the method of point transect was practised. A record of male territorial vocalization was used. The research last from 9th June 2008 to 8th July 2008 in the extent of 598,3 hectare and in the average altitude of 877,7 metres above sea-level. Sixty-two males of corncrake was found out in total. The average population density was 0,07 ex./ha. Among 39 monitored localities there were 53,9 % of perennial biomass crops, 23,8 % of localities without management, 11,9 % of grasslands and 10,5 % of localities where the management according to the agroenvironmental programme is practised. It was acknowledged a positive influence of localities where the management according to the agroenvironmental programme is practised on corncrakes occurrence. In spite of the procentual representation of these localities being the smallest the average occurrence of corncrake there is the largest. It appears from these results that the agroenvironmental programme called "Bird localities on biomass crops - the breeding place of corncrake" is beneficial.
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