ABSTRACT
It is shown that the structure of the ground-nesting bird fauna in Transvolga steppes has changed during the 20th century. The complex of lark species characteristic of true and dry steppe has disappeared because of climate change and impact of economic activity (the establishment of windbreak and roadside forest strips), which has provided for a sharp increase in the abundance of corvid birds.
Subject(s)
Animal Migration/physiology , Birds , Nesting Behavior/physiology , Animals , Conservation of Natural Resources , Ecosystem , Forestry , Population DynamicsABSTRACT
Analysis of the area limits where African wild cat was found as well as of published data on its distribution in the Saratov Transvolga Region demonstrated that the local range of this species extended and its northwestern limit advanced almost 1000 km to the Volga zoogeographical boundary.
Subject(s)
Ecosystem , Felis/physiology , Animals , Cats , Russia , SeasonsABSTRACT
We studied the abundance, spatial structure, and democratic parameters of the Trans-Volga population of great bustard as well as this species connection to the habitats during premigratory movements. The data were obtained by monitoring a test area of 1,200,000 hectares in 1998-2000. Time-related changes in the structure of great bustard habitats in Saratov Trans-Volga Region during the 20th century are described and the mechanisms underlying the changes in this species connection to the habitats under the influence of anthropogenic factors are proposed.
Subject(s)
Birds/physiology , Population Dynamics , Age Factors , Animals , Behavior, Animal , Female , Male , Russia , Sex RatioSubject(s)
Environment , Shrews/physiology , Animals , Animals, Wild , Chromosome Mapping , Karyotyping , Male , Russia , Shrews/classification , Shrews/geneticsABSTRACT
The kind of the regulating agent for the quantitative control of the epidemically dangerous species depends on the concrete tasks. The poison of the critical action causes a strong, but short-time effect. The pesticide inhibiting the reproductive system of the rodents exerts long and profound influence on the population structure.