The Role of Hydrographic Mapping in the Study of Emerging Aquatic Insects on the Landscape Scale

Emerging aquatic insects constitute one of the main biological flows connecting and terrestrial ecosystems. In a landscape, there are many sources emergence, which vary in space time. Thus, they must be clearly defined when studying inland dispersal insects. this study, we five types hydrographic networks (including or not including ponds ditches) on basis cartographic data varying degrees detail (from OpenStreetMap to field map) order explain abundance We sampled Ephemeroptera, Plecoptera, Trichoptera, Megaloptera (ETPM) with 64 sticky traps homogeneously covering 75 ha agricultural landscape. The is logically better explained by recorded directly than reference network, incomplete (OpenStreetMap). results show that, depending sampling period, all water bodies landscape necessarily emergence. To our knowledge, issue defining emerging has never been raised. Based practical example, short note shows refining network match explanatory power insect can greatly improved.