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2.1 Energy Flow and Nutrient Cycles
Transcript of 2.1 Energy Flow and Nutrient Cycles
How energy flows
In an ecosystem, energy flows from
producers (plants) to primary consumers
(herbivores) to secondary and tertiary
The total amount of living organisms in a given area is known as the BIOMASS
Biomass is usually expressed in grams or kilograms per square meter.
energy flow is the transfer of energy from an ecosystem to an organism or from one organism to another
Plants are called producers because they
produce food in the form of carbohydrates
Consumers eat plants or other organisms
Organisms such as bacteria and fungi continue the flow of energy
by changing waste and dead organisms into usable nutrients.
This is called
We can model energy flow through
food chains, webs and pyramids
Each step in a food chain is called a
How many trophic levels can you count?
Consumers can be broken down into Detrivores, Herbivores and Carnivores
Humans will eat anything and
are therefore omnivores
Most food chains are interconnected and form
A food pyramid shows the loss of energy from one trophic level to the next
Up to 90% of the energy entering a level is used for chemical reactions and is lost as heat.
For this reason, the further up the pyramid you go, the fewer the organisms that can be supported
We also call them