Influence of the surface roughness of hard substrates on the attachment of selected running water macrozoobenthos [Elektronische Ressource] / Petra Ditsche-Kuru

Influence of the surface roughness of hard substrates on the attachment of selected running water macrozoobenthos Dissertation zur Erlangung des Doktorgrades (Dr. rer. nat.) der Mathematisch-Naturwissenschaftlichen Fakultät der Rheinischen Friedrich-Wilhelms-Universität vorgelegt von Petra Ditsche-Kuru aus Mönchengladbach Bonn, 2009 Angefertigt mit Genehmigung der Mathematisch-Naturwissenschaftlichen Fakultät der Rheinischen Friedrich-Wilhelms-Universität Bonn 1. Referent: Prof. Dr. rer. nat. habil. Wilhelm Barthlott 2. Referent: PD Dr. rer. nat. habil. Jochen Koop Tag der Promotion Contents Preface and acknowledgements 1 1. General introduction 3 2. Background and state of knowledge 5 2.1 Current in running waters 5 2.2 The influence of current on aquatic macroinvertebrates 8 2.3 Attachment devices of torrential macroinvertebrates 14 2.4 Surface texture of hard substrates and its influence on the attachment of macrozoobenthos 20 3. The surface roughness of natural hard substrates in running waters and its influence on the distribution of selected macrozoobenthos organisms 24 3.1 Introduction 26 3.2 Study area 28 3.3 Material and methods 30 3.4 Results 33 3.5 Discussion 46 3.6 Conclusions and outlook 51 4.