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… by noise or lights, pollution through air, etc. Food web structure and interactions: Species or groups of species perform certain roles in the food web (functional groups); changes in species composition may not necessarily lead to changes in the food web as long as roles are taken over by other species. …

… as a ‘fugitive’ resource: that means that – unlike land, food, trees, minerals or even people – when left alone water … on grounds of: flood control, more irrigation for food or fibre production, urban or industrial supply, … to ‘deficit’ rivers to increase irrigation and thereby food grain production, mitigate floods and droughts, and …