food chain

views updatedMay 21 2018

food chainThe transfer of energy from green plants (the primary producers) through a sequence of organisms in which each eats the one below it in the chain and is eaten by the one above. Thus plants are eaten by herbivores, which are then eaten by carnivores. These may in turn be eaten by different carnivores. The position an organism occupies in a food chain is known as itstrophic level. In practice, many animals feed at several different trophic levels, resulting in a more complex set of feeding relationships known as afood web. Seebioenergetics;consumer;producer;pyramid of biomass;pyramid of energy;pyramid of numbers.

food-chain

views updatedJun 11 2018

food-chainThe transfer of energy from theprimaryproducers (green plants) through a series of organisms that eat and are eaten, assuming that each organism feeds on only one other type of organism (e.g. earthworm → blackbird → sparrowhawk). At each stage much energy is lost as heat, a fact that usually limits the number of steps (trophic levels) in the chain to four or five. Two basic types of food-chain are recognized: thegrazinganddetritalpathways. In practice these interact to give a complex food-web.

food chain

views updatedMay 21 2018

food chainThe transfer of energy from the primary producers (green plants) through a series of organisms that eat and are eaten, assuming that each organism feeds on only one other type of organism (e.g. earthworm → blackbird → spar-rowhawk). At each stage much energy is lost as heat, a fact that usually limits the number oftrophic levelsin the chain to four or five. Two basic types of food chain are recognized: thegrazinganddetrital pathways. In practice chains interact to give a complexfood web.

food chain

views updatedMay 29 2018

food chainTransfer of energy through a series of organisms, each organism consuming the previous member of the chain. Its main sequence is from green plants (producers) toherbivores(primary consumers) and then tocarnivores(secondary consumers). Decomposers, such as bacteria and fungi, act at each stage, breaking down waste and dead matter into forms that can be absorbed by plants, thus perpetuating the chain. See alsodecomposition;photosynthesis

food-chain

views updatedMay 23 2018

food-chainThe transfer of energy from theprimary producers(green plants) through a series of organisms that eat and are eaten. At each stage much energy is lost as heat, a fact that usually limits the number of steps (trophic levels) in the chain to 4 or 5. Two basic types of food-chain are recognized: thegrazinganddetrital pathways. In practice, these interact to give a complex food-web.

food-chain efficiency

views updatedJun 11 2018

food-chain efficiencyThe ratio between the energy value (the nutritional value, discounting indigestible parts such as hair or feathers) of prey consumed by apredatorand the energy value of the food eaten by that prey. Maximum food-chain efficiency (grossecological efficiency) occurs when the yield of prey to the predator is such that the surviving prey just consume all the available food: this implies that the food of the prey is being exploited to the best advantage by the predator.

food-chain efficiency

views updatedJun 11 2018

food-chain efficiencyThe ratio between the energy value (the nutritional value, discounting indigestible parts such as hair or feathers) of prey consumed by apredatorand the energy value of the food eaten by that prey. Maximum food-chain efficiency (grossecological efficiency) occurs when the yield of prey to the predator is such that the surviving prey just consume all the available food: this implies that the food of the prey is being exploited to the best advantage by the predator.

food-chain efficiency

views updatedMay 11 2018

food-chain efficiencyThe ratio between the energy value (the nutritional value, discounting indigestible parts such as hair or featehrs) of prey consumed by a predator and the energy value of the food eaten by that prey. Maximum food-chain efficiency (grossecological efficiency) occurs when the yield of prey to the predator is such that the surviving prey just consume all the available food: this implies that the food of the prey is being exploited to the best advantage by the predator.

food chain

views updatedJun 27 2018

food chainThe chain between green plants (the primary producers of food energy) through a sequence of organisms in which each eats the one below it in the chain, and is eaten in turn by the one above. Also used for the chain of events from the original source of a foodstuff (from the sea, the soil, or the wild) through all the stages of handling until it reaches the table.

food chain

views updatedMay 11 2018

food chain• n. a hierarchical series of organisms each dependent on the next as a source of food.