[Risk potentials of agricultural managament for amphibians in rural areas - A space-time approach]

amphibians amphibien anfibios animal migration animal welfare bienestar animal biocenose biocenosis biocoenosis biotope biotopes brandenbourg brandenburg brandenburgo cropping patterns cropping systems encuestas habitat habitats land management manejo del suelo migration animale mise en valeur du sol plan de culture sistemas de cultivo soil management surveys