Unit 7, Day 3

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Unit 7, Day 3
Homework Quiz (6)
• Open Note (stamp)
▫ Autotrophs (all types)
▫ Heterotrophs (all types)
▫ Food Chains
▫ Food Webs
▫ Producers and Consumers (all trophic levels)
▫ Energy, Biomass, and Numbers Pyramids
Agenda (1)
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Homework Quiz
Agenda
Homework Debrief
Learning Goal
String Activity
Activity Analysis
Pyramid Activity
Island Application (Research)
Homework
Homework Debrief (6)
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Autotrophs (all types)
Heterotrophs (all types)
Food Chains
Food Webs
Producers and Consumers (all trophic levels)
Energy, Biomass, and Numbers Pyramids
Learning Goal (1)
• Objective 2.5.F (Energy Models) – I can describe
how energy flows through an ecosystem and I
can model this with food chains, food webs, and
ecological pyramids.
String Activity (15)
• If possible, find the person with the same word
• Together, hypothesize if/who you consume AND
if/who consumes you
▫ There may be multiple answers!
• Approach those other organisms. IFF they agree
with your hypothesis, then place a string
between you.
▫ Try to keep string untangled
▫ Please do not push through strings
Activity Analysis (10)
• Based on what we as a class determined, work with your
table to draw a food web.
• Determine what each organism is: primary producer,
primary consumer, secondary consumer, tertiary
consumer, detritivore, or decomposer
▫ It’s okay for you to be incorrect! Take a risk.
• Alligator Lizard, Bacteria, Cricket, Dead Animals, Dead
Leaves, Earthworm, Fox, Fungus, Hawk, Maggots,
Maple Tree Leaves, Millipede, Mushrooms, Pillbugs,
Robin, Rotting Log, Sun
Activity Debrief (3)
Notes (4)
• Detritivores CONSUME detritus
▫ Detritus = dead plants/animals, feces
▫ Millipedes, woodlice, dung flies, slugs, worms, sea
stars, sea cucumbers, fiddler crabs
• Decomposers CAN’T EAT. They ABSORB &
BREAK DOWN cells.
▫ Bacteria (dec. meat), fungi (dec. fruits/veggies)
Pyramid Activity (4)
• On panel 1:
▫ Ecological Pyramids
 Graphs of trophic structure
▫ Trophic levels (feeding position)
 Primary producer = autotroph
 Primary consumer = herbivore
 Secondary/Tertiary consumer = omnivore/carnivore
Pyramid Activity (8)
• Panel 2
• Pyramid of Energy
▫ Flow of energy
▫ Lose 90% of energy as heat
 Only 10% of energy available for
next trophic level
▫ Base has 100% of energy
available
Pyramid Activity (8)
• Panel 3
• Pyramid of Biomass
▫ Biomass per area
▫ Biomass = mass of each individual
x number of individuals at each
trophic level
▫ g/m2
Pyramid Activity (8)
• Panel 4
• Pyramid of Numbers
• # of individuals per area
• Large # of producers at base
• Lower # of carnivores at top
▫ (Usually)
Island Application (22 + 3 cleanup)
• Must have primary producers, primary consumers,
secondary consumers, tertiary consumers, and
decomposers.
• Must contain autotrophs, herbivores, omnivores,
carnivores, and detritivores.
• Create a food web that contains at least 3 organisms at
each trophic level + decomposers + detritivores
• Humans do not count!
Homework (1 min)
• Due Wed 4/17 or Thu 4/18
▫ YouTube Video: Biogeochemical Cycles
▫ Homework Quiz: Biogeochemical Cycles
• Homework quiz is open note
• Suggestion: Draw each cycle!!!

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