Marine pollution is a primary cause of eutrophication of surface waters, in which excess nutrients, usually nitrates or phosphates, stimulate algae growth. Many potentially toxic chemicals adhere to tiny particles which are then taken up by plankton and benthic animals, most of which are either deposit feeders or filter feeders. In this way, the toxins are concentrated upward within ocean food chains. Many particles combine chemically in a manner highly depletive of oxygen, causing estuaries to become anoxic. When pesticides are incorporated into the marine ecosystem, they quickly become absorbed into marine food webs. Once in the food webs, these pesticides can
Short food supply chains can develop autonomous marketing strategies based on differentiation. These strategies give farmers the possibility of keeping a bigger share of the value added within the farm and within the local economies. Given these characteristics, short food supply chains are increasingly taken into consideration by rural and food policies as a driver of change in the food system and a policy tool for rural development. The analysis of short food supply chains has fed a broader debate on "alternative food chains", "alternative food networks", and "sustainable food chains". SFSCs are considered the most appropriate channels for organic and locally specific products