Download Food Chains and Food Webs

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts
no text concepts found
Transcript
Food Chains and Food
Webs
Energy Flow in Nature
Energy Roles
• An organism’s energy
role in an ecosystem
may be that of a
producer, consumer, or
decomposer.
Producers
• An organism that can make its
own food is a producer.
• Autotroph
• Source of all food in an
ecosystem.
• Capture energy from sunlight
and stores it as food energy.
Consumers
• Consumers are heterotrophs, or
living things that cannot make food
for themselves.
• A food chain contains several kinds
of consumers, each of which
occupies a different trophic level.
• Herbivore, carnivores, omnivores
Consumer Trophic Levels
• Primary consumers eat producers
(herbivores and omnivores)
• Secondary consumers eat primary
consumers (carnivores and omnivores)
• Tertiary consumers eat secondary
consumers (carnivores and omnivores)
• Scavengers are carnivores and
omnivores that feed on the bodies of
dead organisms.
Decomposers
• Help break down wastes
and dead organisms and
return the raw materials
to the environment
• Bacteria and fungi
Food Chains
• Series of events where one
organism eats another and
obtains energy.
• First organism in chain is
the producer.
• The second organism is the
consumer that eats the
producer.
Plankton—Crab—Seal—Orca
This is only one possible chain
in a marine ecosystem.
Come up with an example to fill in
the blocks of a food chain in two
different ecosytems.
Food Webs
• Consists of many
overlapping food chains in
an ecosystem.
• Some organisms may play
more than one role by
changing consumer levels.
What happens in a food web
if one or more of the
organisms disappear?
Which
animals are
carnivores
and
herbivores?
Energy Pyramids
• A diagram that shows the
amount of energy that
moves from one feeding level
to another in a food web.
• Represented in a triangle
with the most energy at the
producer level.
Energy Loss and Use
• 10% of energy transferred to
next higher level.
• 90% of energy is used by
organisms’ life processes.
• Due to energy loss, ecosystem
cannot support many feeding
levels.