The Journal is published by the Nature Conservation Agency of the Czech Republic in cooperation with the Cave Administration of the Czech Republic, the Krkonoše Mts. National Park Administration, the Bohemian Forest Mts. National Park Administration, the Podyjí National Park Administration and the The Bohemian Switzerland National Park Administration. It has been published since 1946.
cs / en
Nature Conservation 2/2010 — 20. 4. 2010 — Nature and Landscape Management — Print article in pdf
The Large Saw-tailed Bush-cricket on the Jičín Meadows contra Agricultural Subsidies
versus zemědělské dotace
Rovnokřídlí (kobylky a sarančata) jsou spolu s motýly nejnápadnějšími bezobratlými obyvateli českých luk. V této skupině hmyzu většina druhů obývá otevřené biotopy, nejčastěji právě nejrůznější typy luk, a jejich stridulace je zvláště v letních měsících všudypřítomná. Vedle běžně rozšířených a hojných druhů se u nás vyskytují také druhy vzácné a ohrožené. Jedním z nejpozoruhodnějších je kobylka zavalitá (Polysarcus denticauda).
Full-area mowing of meadows in the extremely unsuitable period in mid-June has almost struck a death blow to a newly found Large Saw-tailed Bush-cricket (Polysarcus denticaudus) population in the District of Jičín (eastern Bohemia). In 2007, all meadows in the region were newly mown in mid-June and at the site, only eight males stridulated pushed into narrow unmown strips along a railroad track and road ditches. A year later, the situation was similar – 12 stridulating males, dispersed across small remnant grassland patches in early June, were later reduced during mowing road ditches. Because the habitat inhabited by bush-crickets is extremely small and survey on possibly suitable sites within 20 kilometres of the site carried out in 2008 did not reveal other populations of the insect species, the status of the only known Czech population should be considered critical.