Cumulative effects are studied, among others, on the inundation area of the Morava river region. We present results of the different evaluation approaches, focused in particular on impacts on birds. For some decades the alluvial territory of Morava river was closed for any economic activity, which helped to protect natural biotopes against agricultural collectivization and loss of biodiversity, common in the other parts of Slovakia in the second half of 20th century. Following the "opening” of the territory in the last decade of 20th century, the big changes have taken place and immediate reaction of birds on the biotopes disturbance could have been observed. The article brings results of the project carried out at the Faculty of Natural Sciences studying and evaluating the cumulative effects in the field of landscape ecological and environmental research.