Research focuses on the diversity
and variability of structures and key functions of freshwater
ecosystems at different spatial and temporal scales. We mainly
investigate two types of running waters: lowland sandy-bottomed
streams and karst streams. Core features of sandy streams
are the harsh shifting sand, the mostly immobile woody debris as well
as tree roots as the only hard substrates, and allochthonous inputs
of coarse particulate organic matter. Karst streams in contrast are
characterized by their temporary character, causing at the reach
scale more or less predictable flow intermittency and habitat
fragmentation due to stream drying. At the local scale, shrinking and
expansion of the water body is a typical phenomenon exerting
hydraulic stress on the biota.
Tropical and boreal freshwater ecology
Biodiversity patterns and ecosystem functions encountered in temperate regions are compared to tropical and boreal streams, rivers, and lakes (Costa Rica, Guatemala, Colombia, Chile, Peru, Russia).