Flexibility in habitat use, flight behaviour and echolocation of the northern bat, Eptesicus nilssonii and consequences for its conservation in Central Europe [Elektronische Ressource] / von Moritz Haupt

Flexibility in habitat use, flight behaviour and echolocation of the northern bat, Eptesicus nilssonii and consequences for its conservation in Central Europe Von der naturwissenschaftlichen Fakultät der Universität Hannover zur Erlangung des Grades DOKTOR DER NATURWISSENSCHAFTEN Dr. rer. nat. genehmigte Dissertation von Dipl.-Biol. Moritz Haupt geboren am 10.12.1974, in Hannover 2005 Referentin: PD Dr. Sabine Schmidt Korreferent: Prof. Dr. Klaus Wächtler Tag der Promotion: 14.07.2005 Contents Contents 1 Abstract 1 2 Zusamenfasung 3 3 Outline and scope of the study 5 4 Chapter 1 - The importance of interspecific competition and habitat use to the northern bat as revealed by transect surveys 11 4.1 Introduction 11 4.2 Material & Methods 13 4.2.1 Study area 13 4.2.2 Bat surveys 14 4.2.3 Radio-tracking and individual time budgets 15 4.2.4 Analysis and statistics 16 4.3 Results 17 4.3.1 Bat activity along the transect 17 4.3.2 Time budget of radio-tracked bats 24 4.3.3 Foraging distances of radio-tracked bats 25 4.3.4 Interspecific encounters of radio-tracked bats 26 4.4. Discussion 28 4.4.1 General Observations 28 4.4.2 Abiotic factors 4.4.