S. Schuster et M. Peintinger, ARE NATURE-RESERVES AN EFFECTIVE INSTRUME NT FOR THE PROTECTION OF SPECIES - AN ASSESSMENT AFTER A 26-YEAR PERIOD IN 2 NATURE-RESERVES IN SOUTHWEST GERMANY, Journal fur Ornithologie, 135(4), 1994, pp. 587-597
During 26 years the number of species and territories of breeding bird
s eras counted annually in two nature reserves in Southwest Germany. T
he trends for both factors are negative. An increase of human activiti
es is seen as the main reason for the decline.