• Littoral sites within c. 10 km of the point of discharge of a catchment of the medium size range (50-4000 km²) would appear to be most threatened by any changes in erosion rate within that catchment (most likely caused by deforestation or change in farming practices).
  
  
• It is likely that considerable changes have already occurred in the lakes biota caused by recent (last 50 years) increases in the inflow of suspended matter to the lake.

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