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ČGS Olomouc

Hrdibořické rybníky (Hrdibořice Fishponds) National Nature Monument

The Hrdibořické rybníky NNM is an area of ponds and meadows on the right bank of the Blata stream on the north edge of the village of Hrdibořice. As one of the largest fenny meadows, the area is an important habitat for rare plant and animal species. It is the only current site of occurrence of the narrow-fruited watercress (Nasturtium Microphyllum) and marsh angelica (Angelica palustris) in the Czech Republic. The basement of the Quaternary fluvial ballast contains the pelitic and psamitic calcareous sediments of the baden with a relatively thick stratum of fine-grained fluvial gravel sands. The gravel sand overlying stratum is formed by loesses and overbank deposits. The site is rich in the bird species (a total of 67 bird species have been observed), offer of food and various types of habitats (ponds, wetlands, meadows, copses, forests). The rarest birds living in this habitat include the little bittern (Ixobrychus minutus), garganey (Anas querquedula), water rail (Rallus aquaticus), great reed warbler (Acrocephalus arundinaceus), great crested grebe (Podiceps cristatus), common pochard (Aythya ferina), tufted duck (Aythya fuligula) and Eurasian coot (Fulica atra). In addition, also the Eurasian Marsh-harrier (Circus aeruginosus) nests in this nature reserve. The bog soil for the Luhačovace and Piešťany spas and for the „Vitahum“ fertilizer production was mined here between 1938 and 1963. Its extraction gave rise to the Velký a Malý rybník (Large and Small Fishponds) that form a heart of the today’s nature reserve. The water level in both ponds has dropped by 30 to 50 cm in recent years. The project aimed at bringing water from the neighbouring Blata stream to improve the hydrological regime was carried out between 1996 and 1997. The artificially established meadows are now kept in records as permanent grassland. They are mowed annually as well as the banks of water drainage ditches. The fruits of the original Angelica palustris plants were taken in the 80´s. The species was reproduced in the culture and now, as a part of the rescue programme conducted in cooperation with the Department of Botany of the Palacký University in Olomouc, the plants are repatriated to their original habitat.

GPS position

N 49° 28.906', E 17° 13.399'



Česká geografická společnost
Mgr. Petra Karvánková, Ph.D.
Katedra geografie PF JU v Českých Budějovicích, Jeronýmova 10, 371 15 České Budějovice
Tel.:+420 387 773 063