Most Hungarian ecosystems are agro-ecosystems dominated by crops. In these agroecosystems small game has a secondary, but nevertheless very important role. On the one hand, the wild fauna figures are an indicator of the sustainability of a system. On the other hand, game management and hunting are traditional activities. Hunting can be regarded as a special kind of agriculture and small game management takes place on agricultural land, so more should be known about the connection between ecosystem components, such as climatic factors, crops and small game populations, for example that of hare. Data on the land use in Hungary were collected between 1960 and 2006. The area and yield of 30 field crops and various meteorological parameters were examined, as well as hare populations. The results suggest that in general the magnitude of crop areas had a stronger effect than the yield, while weather parameters had the weakest impact on the hare population.