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Table 2 Summary of isolation distances based on mean versus high cross-pollination where applicable to non-GM or organic crop production as well as GM field trials and non-GM seed production (X)

From: A case study of GM maize gene flow in South Africa

% GM threshold <1.0 to 0.1 <0.1 to 0.01 <0.01 to 0.001
Distance range (m) 14-45 (mean) a 36-135 (high) b 45-145 (mean) 135-503 (high) 145-473 (mean) 503-1869 (high)
Non-GMc X X X
Organicc X X X
GM field trials    X
Non-GM seed production    X
  1. aIsolation distances based on mean cross-pollination; bisolation distances based on high cross-pollination; crequired % threshold may differ between different coexistence systems.