Šikšnosparnių (Chiroptera) maitinimosi aktyvumo priklausomybė nuo aplinkos sąlygų / ; Influence of environmental conditions to bat (chiroptera) foraging activity.

Influence of Environmental Conditions to Bat (Chiroptera) Foraging Activity Gretė Vaičaitytė In May 03 – October 22 of 2015 was done research of bat feeding activity in diferent biotopes. During research was found eleven bat species: E. nilsonii, E. serotinus, M. dasycneme, M. daubentonii, N. leislerii, N. noctula, P. nathusii, P. pipistrellus, P. pygmaeus, P. auritus, V. murinus. Only E. serotinus was found in all observation places. P. auritus was found only in two places (near Šilas bridge and in Šilas forest). All other species was found in at least three places. Foraging activity of diferent spcies was not significant different. During research was found weak correlation (r=0.3) between M. dasycneme and M. daubentoni as well as changes in Vilnius bat population last few years: increase of M. dasycneme and P. pygmaeus and decrease of E. nilsonii, M. daubentonii and B. barbastellus. There was foun that bat foraging activity increase with increasing air temperature, barometrical pressure going close to middle meanigs, becoming full moon and fading cloud covering but does not depend on air humidity, wind direction and speed, time after sunset and geomagnetic activity. Bat activity in different biotopes were different: in shorest of Neris river average activity was weaker than in Bernardinai park and Šilas forest.