SS3.16 Lentic-Lotic Linkages in Freshwaters: Comparisons from Different Ecosystems
Date: Thursday, June 13, 2002
Location: Poster Session - VCC
 
TocknerK, EAWAG/ETH, Duebendorf, Switzerland, tockner@eawag.ch
Karaus, U, , EAWAG/ETH, Duebendorf, Switzerland, ute.karaus@eawag.ch
Alder, L, , EAWAG/ETH, Duebendorf, Switzerland, laurenz.alder@bluewin.ch
Baur, H, , EAWAG/ETH, Duebendorf, Switzerland, baurhe@mail.student.ethz.ch
Ward, J, V, EAWAG/ETH, Duebendorf, Switzerland, jvward@eawag.ch
 
FLOODPLAIN PONDS: KEY LANDSCAPE ELEMENTS ALONG RIVERINE CORRIDORS
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Floodplain pond distribution, diversity and dynamics were investigated with a nested sampling design (corridor, reach, and habitat scales) along three Alpine riverine corridors that differed in their degree of anthropogenic impact. Results demonstrate that ponds are very sensitive landscape indicators of hydrological and morphological changes. In natural sections, density can be as high as 100 ponds per river-km. Significant positive relationships were demonstrated between the density and diversity of ponds and the presence of vegetation islands and large woody debris. Floodplain ponds considerably increase reach-scale biodiversity by adding distinctive lentic communities to the riverine corridor. For example, even highly dynamic braided flood plains are colonised by a diverse amphibian community exhibiting nearly perfect nestedness, suggesting that selective colonisation/extinction processes predominated.