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TZID:Europe/Berlin
TZUNTIL:20131027T010000Z
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DTSTART:20111030T030000
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RDATE:20121028T030000
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DTSTART:20110327T020000
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DTSTAMP:20260804T214844Z
DESCRIPTION:An ever-increasing proportion of the forested landscape is conv
 erted to  forest edges and fragments\, yet the full extent of cascading ef
 fects on  ecological processes and biodiversity persistence remains poorly
   understood. In a Brazilian-German research project\, we explored this  t
 opic by asking how anthropogenic landscape alterations impact ecosystem  e
 ngineers and modify their functional significance.\nAs a model system\,  w
 e studied leaf-cutting ants (LCA)\, which turned hyper-abundant due to  hi
 gh levels of forest fragmentation across the Neotropics. I compile  quanti
 tative results on (1) the mechanisms driving LCA proliferation and  (2) th
 e manifold impacts leaf-cutting ants LCA exert on forest  structure\, micr
 oclimate\, edaphic conditions\, plant performance\, and  floristic and fun
 ctional signature of plant assemblages.\nIn synthesis\, we found that ecos
 ystem engineering by LCAs is strongly  context-dependent: While in undistu
 rbed forests regional habitat  diversity is enhanced through the creation 
 of high-resource patches\,  anthropogenic forest transformation (i.e. high
 -light environments with  dominance of light-demanding species) causes syn
 ergistic feedback  mechanisms turning LCAs into a large-scale disturbance 
 that promotes  floristic and functional impoverishment of modern forests.
 \n \n \n\nEingeladen durch Bettina Engelbrecht\n \n \n 
DTSTART;TZID=Europe/Berlin:20120202T170000
DTEND;TZID=Europe/Berlin:20120202T183000
SUMMARY:Dr. Rainer Wirth\, Department of Plant Ecology and Systematics\, Un
 iversität Kaiserslautern (Homepage): Trophic disruptions and biotic homoge
 nization in fragmented forests: Unveiling success and impact of a neotropi
 cal key herbivore (leaf-cutting ants)
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