A food web is the connection from organism to organism in a habitat or biome
http://www.promotega.org/uga07003/food%20chain.html
Autotrophs, otherwise known as producers, form the lowest trophic level in both foodchains and foodwebs. Examples of producers are plants or plankton.
Food webs demonstrate how different living things in an ecosystem get the energy to survive by demonstrating the accurate way of showing how energy is transferred in feeding interactions in an ecosystem.
J. M. O'Connor has written: 'Polychlorinated biphenyl transport in coastal marine foodwebs' -- subject(s): Effect of water pollution on, Environmental aspects, Environmental aspects of Polychlorinated biphenyls, Fishes, Polychlorinated biphenyls
Biodiversity is important in the following ways:Help to regulate climate, rainfall and windPurify air and waterHelp in cycling of nutrientsHelp to preserve fertile soilForm food chains and foodwebs; thereby maintaining a balance in the availability of food to all life forms