природоохранный статус

Basic principles underlying the methodology of the procedure of entering and deleting biological species in regional Red Data Books are shown. With Natrix tessellate as an example, an algorithm is demonstrated to exclude a species from the list of rare and endangered animals needing special protection measures. As a result of our longterm field studies of the N. tessellata populations, a positive trend in the abundance change in its population and in the spectrum of biotopical correspondence and geographical distribution within the Saratov region has been established.

The list of species of water invertebrates and the amphibiotic insects is analysed by results of the long-term researches in 2006 – 2015. Effects of climate transformation and change of the hydrological treatment on a condition of water ecosystems and population of such species are shown. The key factors causing negative consequences for ecosystems of the rivers, floodplain lakes and temporary waterbodies serving as biotopes of rare and endangered species of hydrobionts are defined.