close

Вход

Забыли?

вход по аккаунту

код для вставкиСкачать
*Energy*
in
Ecosystems
Producers- an organism that
uses energy from the sun to
produce their own food.
Producers are the original
source of all food in an
ecosystem.
Consumers-
organisms
that must
consume
other
organisms
because
they cannot
make their
own food
Primary
Consumers-
Organism that
gets its energy
from producers
(plants)
Secondary
Consumer-
a consumer
that gets
its energy
from other
consumers.
Example: Mouse
(consumer of grass)
gets eaten by a cat
Tertiary Consumer- a high level
consumer (usually a top predator
in an ecosystem). Example: Insects
(primary consumers) are eaten by frogs (secondary
consumers) frogs are eaten by jaguars
Quick Review- Types of
Consumers
Herbivore- eat only plants
Carnivore- eat only meat
Omnivore- eat meat and plants
Scavenger- eat dead
organisms
Decomposers- breakdown waste and
other dead organisms and return raw
materials (carbon, nitrogen, oxygen)
to the ecosystem.
Decomposers
Decomposers act as nature’s recyclers. If
an ecosystem did not have decomposers,
the raw materials of life would be wasted
rotting in the bodies of dead organisms.
Luckily decomposers, such as bacteria
and mushrooms fulfill their need for
energy by decomposing the bodies, and at
the same time return simple molecules of
oxygen, carbon, and nitrogen to the
environment.
Since all organisms have a limited
lifespan, all food chains and webs end
with decomposers.
Balance in an Ecosystem
• Nature has a way of balancing
populations
• Organisms are connected to
each other
• They all have a “niche”
Circle of Life
Food
and
Food
What is a chain?
Food chain- a
series of
events
where one
organism
eats
another to
obtain
energy. There
are normally
three to five
links in the
chain.
Food Chains
The first organism in a food
chain is always a producer
(grass). The second
organism feeds on the
producer and is called a firstlevel consumer or primary
consumer (mouse). The
secondary consumer (snake)
feeds on the primary
consumer. The tertiary
consumer feeds on
secondary consumer.
The arrows always point in
the direction that the energy
is flowing, or to the organism
that is consuming the
energy.
What is a web?
Food web- many
overlapping
food chains
in an
ecosystem.
In a food web you
can see how
everything is
connected to each
other.
Food Web
A food chain only shows
one possible path energy
can travel. Just as you do
not eat the same thing
every day, neither do many
organisms. Most producers
and consumers are a part
of multiple food chains.
Organisms can play
different roles in different
food chains. For instance,
an omnivore such as the
grouse is a primary
consumer when it eats
berries and a secondary
consumer when it eats
butterflies.
Energy Pyramid
Energy Pyramida diagram that
shows the
amount of
energy that
moves from one
feeding level
to another in
a food web.
The
further along the food chain
you go, the less food (and hence
energy) remains available.
This
is why it appears like a
“pyramid”
Energy Pyramid
1/--страниц
Пожаловаться на содержимое документа