Population dynamics and placement sand martin, european bee-eater and kingfisher in the middle reaches river Alatyr (Republic of Mordovia)

The questions in the number and spatial distribution of the middle reaches of r. Alatyr three types of birds nestling in holes: sand martin, european bee-eater and the kingfisher on the basis of the results of research in 1997 and 2014. The number of nesting swallows coastal reduced, and bee-eater and ordinary kingfisher increased. The features of the placement of bird colonies, the causes of change in the population.