Trends in research on the possible effects of climate change concerning aquatic ecosystems with special emphasis on the modelling approach

Knowledge on the expected effects of climate change on aquatic ecosystems is defined by three ways. On the one hand, long-term observation in the field serves as a basis for the possible changes; on the other hand, the experimental approach may bring valuable pieces of information to the research field. The expected effects of climate change cannot be studied by empirical approach; rather mathematical models are useful tools for this purpose. Within this study, the main findings of field observations and their implications for future were summarized; moreover, the modelling approaches were discussed in a more detailed way. Some models try to describe the variation of physical parameters in a given aquatic habitat, thus our knowledge on their biota is confined to the findings based on our present observations. Others are destined for answering special issues related to the given water body. Complex ecosystem models are the keys of our better understanding of the possible effects of climate change. Basically, these models were not created for testing the influence of global warming, rather focused on the description of a complex system (e. g. a lake) involving environmental variables, nutrients. However, such models are capable of studying climatic changes as well by taking into consideration a large set of environmental variables. Mostly, the outputs are consistent with the assumptions based on the findings in the field. Since synthetized models are rather difficult to handle and require quite large series of data, the authors proposed a more simple modelling approach, which is capable of examining the effects of global warming. This approach includes weather dependent simulation modelling of the seasonal dynamics of aquatic organisms within a simplified framework.

A magyar eladósodás és a válság hatásai (Hungarian indebtedness and its effects)

A 2008-2009-es pénzügyi és gazdasági válság Magyarországon is felszínre hozta azokat a problémákat, amelyek a hitelezéssel kapcsolatosak. Ellentétben a régió többi, feltörekvő országával, Budapestnek olyan nehézségekkel kell szembenéznie, amelyek mellett nem lehet megfelelő árfolyampolitikát folytatni. Hogyan jutott ide Magyarország, milyen mértékű az állam és a privátszféra eladósodása és mik lehetnek a kiutak - erről olvashatunk a tanulmányban. _____ The recent financial and economic crisis exposed credit problems in Hungary which is denominated in foreign currencies. In contrast to other emerging countries in Central-Europe, Budapest has to face some special differences which can’t be corrected by traditional exchange policies. How did Hungary get into this situation, how big is the indebtedness of the private and public sectors and what kind of solutions are there?