Effects of Temperature–Climate Patterns on the Production of Some Competitive Species on Grounds of Modelling

Climate change has serious effects on the setting up and the operation of natural ecosystems. Small increase in temperature could cause rise in the amount of some species or potential disappearance of others. During our researches, the dispersion of the species and biomass production of a theoretical ecosystem were examined on the effect of the temperature–climate change. The answers of the ecosystems which are given to the climate change could be described by means of global climate modelling and dynamic vegetation models. The examination of the operation of the ecosystems is only possible in huge centres on supercomputers because of the number and the complexity of the calculation. The number of the calculation could be decreased to the level of a PC by considering the temperature and the reproduction during modelling a theoretical ecosystem, and several important theoretical questions could be answered

Navicula novaesiberica Lange-Bertalot; a new record of the species from the Danube River in Hungary

Navicula novaesiberica Lange-Bertalot was recorded for the first time on the Hungarian stretch of the Danube River. The species was found in low relative abundance values in the epilithon at God (riv.km. 1669). N. novaesiberica was described more than ten years ago, it is a relatively large and conspicuous species. However, there are only a few records of it in the literature. Some additional details on the morphology and autoecology of this species are provided here