Trophic Levels To study organisms from the point of view of their feeding relationships What they feed on and what feeds on them. 16
16 Trophic Levels • To study organisms from the point of view of their feeding relationships • What they feed on and what feeds on them
Trophic Levels A trophic level refers to the organisms position in the food chain. Autotrophs are at the base.They are called producer Organisms that eat autotrophs are called herbivores or primary consumers. An organism that eats herbivores is a carnivore and a secondary consumer. A carnivore which eats a carnivore which eats a herbivore is a tertiary consumer,and so on. 17
17 Trophic Levels A trophic level refers to the organisms position in the food chain. Autotrophs are at the base. They are called producer Organisms that eat autotrophs are called herbivores or primary consumers. An organism that eats herbivores is a carnivore and a secondary consumer. A carnivore which eats a carnivore which eats a herbivore is a tertiary consumer, and so on
Consumers get their energy from the carbon bonds made by the producers.Another word for a consumer is a heterotroph异养生物.Based on what they eat,.we can distinguish between 4 types of heterotrophs Consumer Trophic Level Food Source Herbivores 草食动物 2 plants Carnivores 肉食动物 0 animals Omnivores 杂食动物 all levels plants animals Detritivores 腐食动物 detritus 18
18 Consumers get their energy from the carbon bonds made by the producers. Another word for a consumer is a heterotroph 异养生物. Based on what they eat, we can distinguish between 4 types of heterotrophs Consumer Trophic Level Food Source Herbivores 草食动物 2 plants Carnivores 肉食动物 3 animals Omnivores 杂食动物 all levels plants & animals Detritivores 腐食动物 - detritus
● Ecologists study the autotrophs,the herbivores,the carnivores,the decomposers and so on,lumping together the species that have a similar role in the community. Trophic literally means feeding,so trophic levels are the levels or positions at which species feed. 19
19 • Ecologists study the autotrophs, the herbivores, the carnivores, the decomposers and so on, lumping together the species that have a similar role in the community. • Trophic literally means feeding, so trophic levels are the levels or positions at which species feed
Energy Flow Through the Ecosystem Heat Heat Producers Consumers Inorganic Nutrient Decomposrs Pool Heat 20
20 Energy Flow Through the Ecosystem