NDFF Monitoring territorial bats by transect

This is a sub-monitoring program that counts a limited selection of a population, namely the sexually active males. A transact of at least 2.5 kilometres is set out through a more or less homogeneous landscape: urban or rural landscape woodland or parkland agricultural areas From 15 August to 30 September, all territorial males of the Nyctalus noctula, Pipistrellus pipistrellus and the Pipistrellus nathusii are counted with a bat detector during 4 to 6 visits. The visits are made on foot. They are exclusively carried out in the evenings, 45 minutes after the species leave the nest at sundown. Data was actively collected from 1990 to 1997 for this monitoring program. Dataset available via https://www.ndff.nl/english / [e-mail] Positive observations without zeros. 924 records (March 2018) https://www.ndff.nl/overdendff/validatie/protocollen/17-205-meetnet-transecttellingen-territoriale-vleermuizen/