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2.1 Energy Flow and Nutrient Cycles

Chapter 2.1 Science 10
by

Neil Ryan

on 15 December 2015

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Transcript of 2.1 Energy Flow and Nutrient Cycles

Energy Flow in
Ecosystems

How energy flows
In an ecosystem, energy flows from
producers (plants) to primary consumers
(herbivores) to secondary and tertiary
consumers (carnivores).
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
through photosynthesis
Producers
Consumers
Consumers eat plants or other organisms
Decomposers
Organisms such as bacteria and fungi continue the flow of energy
by changing waste and dead organisms into usable nutrients.
Biodegredation
This is called
Primary
Consumer
Secondary
Consumers
Tertiary
consumer
We can model energy flow through
food chains, webs and pyramids
Each step in a food chain is called a
Trophic Level
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
Food Webs
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
Herbivores
Detrivores
Carnivores
Full transcript