This paper considers the implications of complex ecologic-economic dynamics for three broad, Post Keynesian perspectives: the uncertainty perspective, the macrodynamics perspective and the Sraffian perspective. Catastrophic, chaotic and other complex dynamics will be seen as reinforcing the conceptual foundations of Keynesian uncertainty. Predator-prey models will be seen as deeply linked to Post Keynesian macrodynamic models. Finally, certain cases in ecologic-economic systems will be seen as generating such Sraffian, capital theoretic conundra as reswitching. Ecologic-economic models considered besides predator-prey will include fisheries, forestry, lake dynamics and global climaticeconomic dynamics.