Biodiversity is of vital importance for supporting environmental processes and is currently considered as the main parameter characterizing the state of the ecological systems. The main component of the global strategy for biodiversity conservation is the creation of protected areas. Nowadays, their total area is almost 12% of the earth's surface, however, quantitative estimates of the positive ecological impact of such areas on the state of biodiversity are not enough to date. The purpose of the work is analyze the effectiveness of environmental measures on the example of the Chernihiv region by the indicator of the "living planet". The research was conducted in the Chernihiv region of Ukraine from 1992 to 2017. Over the past 25 years, the total area of nature-protected areas in the Chernihiv region has increased by almost 3 times. As primary data on the values of populations of mammalian fauna, we used the generalized data of users of hunting grounds in the region according to the form № 2-TP (hunting) "On the hunting economy" in 1992 – 2017. In order to assess the ecological effectiveness of protected areas in preserving biodiversity, we analyze the dynamics of the populations of hunting species in protected areas. As the primary data on the values of the populations of the mammalian fauna, we used the generalized data of the users of the hunting grounds in the region according to the form № 2-TP (hunting)
biodiversity, natural reserve fund, number of populations of the mammalian fauna, index "living planet"