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Résumé :
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Digital acoustic recording devices allow for recording of vocal activity of animals over long time periods and therefore open new perspectives for monitoring. In this paper results of a bioacoustic monitoring of birds in a wetland restoration area in Mecklenburg-Western Pomerania in Northeastern Germany are presented. Ninety minutes of sound recordings were made daily from March 29 until May 30 2012 using a four-channel recording setup. The recording schedule was mainly designed for nocturnal birds but also included dawn and dusk choruses. By listening to the recordings, supported by spectrographic visualization, 61 bird species could be detected. Despite the fact that most of the recordings were made during the night, no period of absolute silence was detected. The occurrence data allow some conclusions on the state of the bird species, e.g., breeding bird, resting during migration, or guest only. The bioacoustic monitoring revealed the occurrence of rare nocturnal birds such as Little Crake (Porzana parva), Spotted Crake (Porzana porzana) and Short-eared Owl (Asio flammeus). For the Eurasian Bittern (Botaurus stellaris) data on vocal activity and population size could be obtained. The study has shown that automated acoustic recordings can be applied for long-term monitoring of bird populations in remote areas.
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