Reproduction of common frog species (Bufo bufo and Rana temporaria) in commercially managed fishponds can be threa - tened due to destruction of egg clutches or early developmental stages of tadpoles. The phenomenon is described based on a monitoring of a forest fishpond in the south-eastern part of Central Bohemia. Data on the size and growth of egg clutches and tadpoles in relation to time and weather conditions are also described and Ivan Vergner.
The order grebes (Podicipediformes) is an archaic group of birds, morphologically and ecologically well adapted to the aquatic life style, including breeding in floating nests in the littoral zone of water bodies. Four grebe species are breeding in fishponds in the Czech republic. Annually during the breeding season, these birds have to overcome many problems to successfully breed. In the incubation period, the most important mission for parents is to protect the eggs from predation. and Jan Sychra.
Successful rearing of a grebe (Podicipediformes) brood depends on several environ - mental factors, such as climatic conditions and food supply at the breeding site. In connection with their insufficient thermoregulation in the first days of their life grebe chicks are brooded, warmed and fed, under the wings on the back of their pa - rents. Although grebes are very adaptable birds, fishpond degradation is currently inducing a decrease of these waterbirds. and Jan Sychra.