A semi-natural or modified natural system managed by humans for food and agricultural production purposes.; Those “eco-systems that are used for agriculture” in similar ways, with similar components, similar interactions and functions. Agro-ecosystems comprise polycultures, monocultures, and mixed systems, including crop-livestock systems (rice - fish), agroforestry, agro-silvo-pastoral systems, aquaculture as well as rangelands, pastures and fallow lands. Their interactions with human activities, including socio-economic activity and sociocultural socio-cultural diversity, are determinant.