Tuesday, October 25th
MS-LS2-1
Analyze and interpret data to provide evidence for the effects of resource availability on organisms
and populations of organisms in an ecosystem.
Big Idea: How energy flows through an
ecosystem
Daily target: I can describe how the sun
formed and where it gets its energy.
Entry Task: What is the essential product of
photosynthesis that plants create for energy that is
shared with all organisms?
Conclusion: From each level of consumers how
much energy is lost from the level below?
Homework: Energy Flow in Ecosystem (11/2) Plan for Today:
Quiz #5 (period 3)
Energy Pyramid Slides
Assignments:
Energy Flow in Ecosystem (Homework)
Graphing Practice (10/25)
Birth of our sun
Oh Deer Lab Data (10/25)
Where does the sun get its energy?
Vocabulary:
Mechanical energy: The energy of movement (kinetic) or position (potential energy). We use
mechanical energy when organisms move.
Thermal energy: The energy produced from living organisms that is lost as heat or referred to as
temperature.
Energy Pyramids
 An energy pyramid is a
diagram that shows how
much energy is at each
step of the food chain.
 A 3d food chain.
 Shows how many
organisms at each step
of food chain
 Where are there more
organisms? Why?
Bottom Level Producers.
 Sunlight is the main source of energy for most life on
earth.
 These are Organisms that can make glucose during
photosynthesis.(energy from sunlight)
 Producers use most of the energy they make for
themselves.
1st level or Primary Consumers
 These are organisms that cannot make their own energy.
 They are herbivores (plant-eaters)
 They eat producers to get energy
 Some energy in the primary consumer is stored & not lost as heat to the
atmosphere or used by the consumer itself.
 This energy is available for another consumer (predator).
2nd level consumers Secondary consumer
 A consumer that eats another consumer for energy Is
called a secondary consumer and
 May be a carnivore, omnivore, predator, or a
scavenger
 Most of the energy the secondary consumer gets from
the primary consumer is used by the secondary
consumer.
3rd level consumers Tertiary Consumer
 A consumer that eats a consumer that already ate a
consumer Is called a tertiary consumer
 May be a carnivore, omnivore, predator,
or a scavenger
 Some of the energy is lost as heat, but some
energy is stored.
What is happening to energy?
Energy Pyramid
In nature, ecological
efficiency varies
from 5% to 20%
energy available
between successive
trophic levels (95%
to 80% loss). About
10% efficiency is a
general rule.
Fig. 4–19
Does all the energy this caterpillar eats get
passed to the bird who eats him?
Plant material eaten
by caterpillar
100 kilocalories (kcal)
35 kcal
50 kcal
Feces
Cellular
respiration
15
kcal
Growth
Figure 19.25
What does Bill Nye the Science Guy have to say about it?
How Many Chains are in
this web?
copyright cmassengale
How big can the pyramid get?
 Why is the third level consumer usually the top of the food
chain?
 Do you think its common to have 4th level consumers?
 Why is it unlikely to have 4th level consumers?
 Why is it even more unlikely to have a 5th and 6th level?