Limno-ecological characteristics and distribution patterns of spring habitats and invertebrates from the Lowlands to the Alps

Springs are autochthonous aquatic ecotones with complex functional properties and heterogeneous eco-morphological structures. Within a small spatial extent, invertebrates are highly diverse and mainly composed of species adapted to the surface–subterranean water interface, the aquatic–terrestrial interface or to the spring habitat itself. In this publication, a first synopsis of limno-ecological case studies of springs from the Lowlands of Schleswig-Holstein, the low mountain ranges of Hesse and Thuringia, the pre-Alps of the Jura Mountains in Switzerland and the Alps in Germany and Switzerland is presented. The field surveys conducted in the different areas focus on an ecological assessment of spring habitats, distribution patterns of the invertebrate fauna and specific regional characteristics. A regional faunistic differentiation of spring-related invertebrate species is evident. A change in the faunistic composition in general and a loss of crenobionts owing to climatic and land-use changes are expected. In addition, it should be noted that long-term monitoring data required to make reliable statements about future developments in the distribution of spring species and to predict habitat conditions are not available.