Download Entry Task - Steilacoom School District

BIOLOGY
21 Sep 2015
Entry Task
Identify each
color as either
a Primary
Producer or
one of the 6
Consumers.
Primary Producer
Carnivore
Herbivore
Omnivore
Detritivore
Decomposers
Scavengers
Agenda
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Entry Task
Housekeeping
The Biosphere (Chapter 3)
Energy Flow in Ecosystems
(Chapter 3.3)
• Learning Objectives
• Exit Task
Housekeeping
• Substitute tomorrow Tuesday, 22 Sep.
- POGIL Worksheet (Ecological Pyramids)
• Quiz #1 Wednesday, 23 Sep. (chapter 3.1 - 3.3)
• Some still need to turn in their CER (12 pnts).
• Be sure you are bringing your science notebook
daily.
Exit Tickets
• Biotic vs. Abiotic?
- Biotic is living organisms, abiotic is non-living
objects.
- Both interact with one another regularly.
• Primary sources of energy?
- Photosynthesis (light) & Chemosynthesis
(chemicals)
Ch 3 Essential Question
How do living and nonliving parts of the Earth interact and
affect the survival of organisms?
Learning Objectives
LO 3.3.1 Trace the flow of energy through living systems.
LO 3.3.2 Identify the three types of ecological pyramids.
Food Chains
How does energy flow through ecosystems?
• Energy flows through an ecosystem in a one-way stream,
from primary producer to various consumers.
What is a food chain?
• A series of steps in which organisms transfer energy by
eating or being eaten.
• Food chain on page 73, figure 3-7.
p. 73
Food Web
What is a food web?
• A network of complex interactions formed by the feeding
relationships among various organisms in an ecosystem.
• Consists of multiple food chains linked together.
• Food web page 75, figure 3-9.
p. 74-76
Food Web
Why is a food web a more accurate representation of the
feeding relationships in an ecosystem than a food chain?
• Organisms are rarely food or feed on just one other
organisms.
• Food chains are simple, but feeding interactions are rather
complex
• Many different feeding relationships exists between
organisms in an ecosystem.
• Food web page 76, figure 3-10.
p. 74-76
Ecological Pyramids
Each step in a food chain/web is called a trophic level.
Trophic levels are represented by ecological pyramids.
There are 3 types of ecological pyramids:
• Pyramid of energy
• Pyramid of biomass
• Pyramid of numbers
p. 77-78
Pyramid of Energy
Pyramids of energy show the relative amount of energy
available at each trophic level of a food chain/web.
• Only 10% of the available energy makes it to the next
trophic level.
p. 77
Pyramid of Biomass
Pyramid of biomass illustrate
the relative amount of living
organic matter available at
each trophic level in an
ecosystem.
Pyramid of numbers shows the
relative number of individuals
at each trophic levels in an
ecosystem
• Both are determined in part
by the amount of energy
available.
p. 78
Check on Learning
Food Chain?
Food Web?
Ecological Pyramids?
• Pyramid of Energy
• Pyramid of Biomass
• Pyramid of Numbers
p. 69-71