SS3.16 Lentic-Lotic Linkages in Freshwaters: Comparisons from Different Ecosystems
Date: Monday, June 10, 2002
Time: 3:45:00 PM
Location: Colwood
 
JunkWJ, Max-Planck-Institute of Limnology, Ploen, Germany, wjj@mpil-ploen.mpg.de
Wantzen, K, M, Max-Planck-Institute of Limnology, Ploen, Germany, wantzen@mpil-ploen.mpg.de
 
LENTIC-LOTIC-LINKAGES: COMPARING TEMPORAL PATTERNS IN PULSING SYSTEMS WITH SPATIAL PATTERNS IN STABLE SYSTEMS
image
River-Floodplain-Systems (RFS) are characterized by cyclic inundation and runoff-phases Habitat stratification can occur at the same place but at different times and water levels. Pulsing represents both a change in food and nutrient resources and in habitat characteristics. Organisms living in RFS cope with these varying conditions by either surviving the adverse period in situ (dormancy) or by following the adequate habitat stratum (migration). The physical habitats of those aquatic ecosystems with relatively stable hydrological borderlines are stratified throughout the year. Unforeseen hydrological changes may act here as catastrophes and flood-derived resources cannot be used by the organisms. To a certain degree, seasonal patterns in floodplain systems can be homologized to spatial patterns in the more stable systems. We exemplify this with a comparison of feeding patterns and isotopic signatures of fish communities of lakes and floodplains.