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...Unit ecosystems concept of an ecosystem understanding degradation resource utilisation structure and functions producers consumers decomposers energy flow in the water cycle carbon oxygen nitrogen integration cycles nature ecological succession food chains webs pyramids introduction types characteristic features forest grassland desert aquatic ponds lakes streams rivers estuaries oceans term was coined by oxford ecologist arthur tansley to encompass interactions among biotic abiotic components environment at a given site living non are known as respectively defined its presently accepted form eugene odum that includes all organisms i e community area interacting with physical so leads clearly trophic diversity material exchange materials between within system or is structural functional ecology where interact each other surrounding words chain interaction their first g english botanist definition plants animals any together such soil air constitute some equally vigorous less affected c...