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A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community. Ecologists can broadly define all life forms as either autotrophs or heterotrophs, based on their trophic levels, the position that they occupy in the food web.
The mean chain length of an entire web is the arithmetic average of the lengths of all chains in the food web. [13] The food chain is an energy source diagram. The food chain begins with a producer, which is eaten by a primary consumer. The primary consumer may be eaten by a secondary consumer, which in turn may be consumed by a tertiary consumer.
The soil food web is the community of organisms living all or part of their lives in the soil. It describes a complex living system in the soil and how it interacts with the environment, plants, and animals. Food webs describe the transfer of energy between species in an ecosystem. While a food chain examines one, linear, energy pathway through ...
The trophic level of an organism is the position it occupies in a food web. Within a food web, a food chain is a succession of organisms that eat other organisms and may, in turn, be eaten themselves. The trophic level of an organism is the number of steps it is from the start of the chain. A food web starts at trophic level 1 with primary ...
A food web model is a network of food chains. Each food chain starts with a primary producer or autotroph, an organism, such as an alga or a plant, which is able to manufacture its own food. Next in the chain is an organism that feeds on the primary producer, and the chain continues in this way as a string of successive predators.
Food pyramid (nutrition) The USDA 's original food pyramid, from 1992 to 2005 [ 1] A food pyramid is a representation of the optimal number of servings to be eaten each day from each of the basic food groups. [ 2] The first pyramid was published in Sweden in 1974. [ 3][ 4][ 5] The 1992 pyramid introduced by the United States Department of ...
Energy flow is the flow of energy through living things within an ecosystem. [ 1] All living organisms can be organized into producers and consumers, and those producers and consumers can further be organized into a food chain. [ 2][ 3] Each of the levels within the food chain is a trophic level. [ 1] In order to more efficiently show the ...
File:Lake Huron Food Web.pdf. Size of this JPG preview of this PDF file: 776 × 600 pixels. Other resolutions: 311 × 240 pixels | 621 × 480 pixels | 994 × 768 pixels | 1,280 × 989 pixels | 1,650 × 1,275 pixels. This is a file from the Wikimedia Commons. Information from its description page there is shown below.
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