Habitat factors influencing the presence of adult Calopteryx splendens (Odonata: Zygoptera)

1. In Great Britain the distribution of the riverine damselfly Calopteryx splendens is predominantly southern. However, the last decade has seen records of the species in previously unoccupied areas in the northeast of England, prompting speculation regarding northward range expansion. The current study is the first to quantify the physical features of the habitat that influence the presence of C. splendens. 2. A field survey was carried out on the physical characteristics of habitat supporting C. splendens along a section of the River Wharfe, West Yorkshire, U.K. Adult C. splendens were marked uniquely for individual identification in order to assess the occurrence of the species within different habitat patches of the study area. 3. A multiple logistic regression was used to identify the significant habitat variables in explaining the occurrence of adult C.