Recently David Guixé, Elena Roca and Gerard Barenegueras have published the paper “Time-lapse photography as an effective method for bat population monitoring”. In it they tests the effectively of time-lapse photography during one year to study a colony of Rhinolophus hipposideros. The results were very positive.
Determining the size of bat populations is essential for evaluating their conservation status. Cameratrapping with time-lapse is a rarely used technique but has many potential advantages for monitoring bats.We tested this technique to see if it is an appropriate technique for monitoring bat colonies all-year-roundand for surveying the phenology of roosting sites. We sampled a colony of lesser horseshoe bats Rhinolophushipposideros for a year to assess the efficiency of this method. We estimated that the colony of R. hipposideroscontained 23-25 adults and 10-14 individuals of juveniles; we determined the arrival time of the colony inMarch and its departure time in early November, as well as the reproductive periods. Their daily activity patternsduring the four seasons were described and consistent with the available literature. We proved this techniqueas a valuable method for bats survey in a non-intrusive way, making possible to gather valuable information onbats populations.