Food chain and food web食物链和食物网.pptx

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2017-05-16 发布于湖北
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Food chain and food web食物链和食物网.pptx

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Food chain and food web食物链和食物网

Function of an ecosystem;What are the functions of an ecosystem?;Food chain and food web;Key words ;Autotroph(自养的)/producers (生产者);Heterotroph (异养的)--Consumers;Consumer;Saprotroph (腐生的);Decomposer;Food chain;Food web;Through food chain and food web, nutrients (elements) were transferred and energy was flowed;What is the original energy source on the earth?; Who’s the most primary producer of organic matters and chemical energy?;Energy flow ;The flow of energy;Will the energy transfer from one trophic level to the next be 100% efficient?Where to be lost?;Energy will be used by animals by moving, digestion, respiration, keeping warm, etc; On average, only 10% of the ingested energy can be transferred to the next trophic level, and 90% will be used or lost ;Dry mass decrease with increase of trophic level;Number of individuals decrease with increase of trophic level;Pyramid of energy;The energy enters and leaves the ecosystem;Practice questions: