93 Breckling, B. & Verhoeven, R. (2013) GM-Crop Cultivation – Ecological Effects on a Landscape Scale. Theorie in der Ökologie 17. Frankfurt, Peter Lang. Implications of GM crops in subsistence-based agricultural systems in Africa Denis W. Aheto 1 , Thomas Bøhn 2,6 , Broder Breckling 3 , Johnnie van den Berg 4 , Lim Li Ching 5 & Odd-Gunnar Wikmark 2 1 School of Biological Sciences, University of Cape Coast, Ghana; 2 GenØk – Centre for Biosafety, Tromsø, Norway; 3 University of Vechta, Germany; 4 Unit for Environmental Sciences and Management, North-West University, South Africa; 5 Third World Net- work (TWN), Malaysia; 6 University of Tromsø, Norway Abstract Africa has deep contentions on the use of GM crops in agriculture, similar to those found in Europe and elsewhere. However, it is apparent that the debate is most protract- ed on the continent with two entrenched viewpoints i.e. the pro-GMO and anti-GMO groups. The challenge for an acceptable consensus is attributable to a complexity of issues relative to the introduction of GM maize into small-scale farming systems that fundamentally relies on open pollinated varieties (OPVs) with broad genetic back- grounds and tolerance to diverse biotic stresses, and which is usually produced for the informal seed market. Other factors relate to the generally low capacity of African states and weak mechanisms for assessing the potential risks posed by GM crops. The lack of public awareness, participation and information sharing are additional limiting factors. These issues have weakened government and policy responses to the potential deploy- ment of GM crops on the continent. This review draws on research-based evidence as a basis to comment on some key issues to inform the development of biosafety standards in African countries. We conclude that the potential introduction of GM crops into small-scale farming would lead to huge consequences from emerging ecological, economic and trade impacts if these issues raised are not taken into account in decision- making processes. Introduction The objective of this review is to draw attention to some key issues within the African context relevant for improving biosafety implementation efforts on the continent. The task of predicting how the presence of transgenes in agricultural crops is likely to influence the ecology and development of a recipient environment and society is highly demanding and requires best available knowledge from a number of different disci- plines (Myhr & Traavik 2007). Moreover, socially responsible actions must also be