Chapter 55

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Biological Sciences
Kamini Persaud

Ecological communities are not assemblages that move together as a unit. Each species has unique interactions with its environment Trophic levels are a useful way of thinking about energy flow in a community Primary producers (photo synthesizers) produce ATP which nearly all other organisms consume Primary consumers (heterotrophs) consume either directly or indirectly the ATP produced by primary producers Organisms that eat primary consumers are secondary consumers Organisms that eat the dead bodies are decomposers Food chains are interconnected to make a food web Energy is lost between trophic levels it decreases going from lower to higher trophic levels except in aquatic systems which is the opposite. Commensalism is the interaction in which one participant benefits but the other is unaffected Amensalism is interaction in which one participant is harmed but the othe
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