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Food Chains, Trophic Levels, and Biological Magnification

Tarika Gadh APBio Period 4
by

Tarika Gadh

on 9 October 2012

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Transcript of Food Chains, Trophic Levels, and Biological Magnification

Food Chain -the transfer of food energy up the trophic levels from its source in plants and other autotrophic organisms through herbivores to carnivores and eventually to decomposers Trophic Levels -feeding relationships between organisms in a community carnivores


herbivores (primary consumers)


autoptrophic organisms (plants) secondary
tertiary
quaternary Biological Magnification -process in which retained substances become more concentrated at each higher trophic level in a food chain -If a lower level of a food web is concentrated with a pollutant, the effects of the toxin are increased as they travel up the food chain quaternary consumers: highest level of consumers
tertiary consumers: carnivores that feed on all trophic levels
secondary consumers: carnivores that eat only primary consumers
primary consumers: organisms that only eat plants
primary producers: organisms that produce their own food through sunlight DDT (dichlorodiphenyltrichloroethane) is a pesticide often found in the ocean -most energy in a trophic level is lost as it passes to the next higher level Food chains are sometimes short because:
a) only a single species of herbivore feeds one each plant species
b) local extinction of a species causes extinction of the other species in its food chain
c) most of the energy in a trophic level is lost as it passes to the next higher level
d) predator species tend to be less diverse and less abundant than prey species
e) most producers are inedible the correct answer is C Food chains are sometimes short because most of the energy in a trophic level is lost as it passes to the next higher level. Ecology
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