ECOLOGY PART 2
Energy Flow In Ecosystems
How Energy Flows
Energy flows through an ecosystems in one direction
Starting with the sun or chemical compounds
Then to autotrophs(producers)
Then to various heterotrophs(consumers)
What are autotrophs
Where does the energy flow start in an ecosystem?
Food chains show how matter and energy move through ecosystems in a series of steps
Each step shows which organisms transfer energy by eating and being eaten
The arrows show who is being transferred the energy (who is doing the eating)
Each organisms in a food chain represents a feeding step, or trophic level, in the transfer of matter and energy
Food chains show you what?
Models that show all possible feeding relationships at each trophic level in a community; links all food chains in an ecosystem together.
Notice that producers are always on the bottom of the energy pyramid
We call consumers on the first level Primary Consumers
We call consumers on the next level Secondary Consumers
We call consumers on the next level Tertiary Consumers
What is always on the bottom level of energy pryamid?
What do we call consumers that consume autotrophs (producers)?
Energy is passed up a food chain or food web from lower to higher trophic levels.
Generally only about 10% of the energy at one level is available to the next level.
The rest of the energy is used for metabolic process or given off as heat to the environment.
How much energy is transferred to the next trophic level?
What happens to 90% of the energy in each trophic level?