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How did the salmon get in the tree?
Unit 4 - Ecosystems
Review – before chapter 7
1) What is an ecosystem?
2) Abiotic vs. biotic
3) Producers, consumers and decomposers
4) Food chains (and food webs)
5) Nutrient Cycle
In 1000 years, will these ecosystems be here?
In an ecosystem, what does it mean to sustain?
What is sustainable?
What is unsustainable?
In what ways, can an ecosystem become unstable?
This is a salmon
Let’s draw a web
Remove an animal, what happens?
Biotic and Abiotic Interactions
Worksheet and mind web – 30 minutes
Keep this paper to help you study!
Geographic Location (Where)
What things can change when you change the location of an ecosystem?
Example: Temperate Deciduous Forests
Example: Boreal Forests
What could threaten these different ecosystems?
What are ways to preserve these ecosystems?
– Create a poster of one ecosystem on 285
- Label clearly the answers for question 2
P287 - #12, 17 and 18 - homework
7.2 Population and Sustainability
Other animal populations
3 Questions I’d like us to think about and to answer
1) Why do populations vary so much for humans and other animals?
2) How do populations change so suddenly?
3) How do populations change so slowly?
Other Animal Populations
“On average, tigers give birth to two or three cubs every two years.
If all the cubs in one litter die, a second litter may be produced within five months.”
Reproduce 4 months after being born
Can have 2 – 12 rabbits in a litter
Can have 4 - 7 litters in a year
One rabbit pair can have 30 – 40 offspring
One rabbit can live up to 9 years
Do you think you could draw a graph of that population of rabbits? *Assuming that all the rabbits would survive for each birth
Can be good
Can be bad
Can be good – species becoming extinct
Can be bad – human population
What happened at
around 300 paramecium?
How does a population stop growing?
- Indefinite support from an ecosystem
Smaller scale: Mom’s house
Larger scale: The earth
Limiting Factors – ways a population is controlled
Limiting Factors – ways a
population is controlled
Human Carrying Capacity
Discuss with your classmates
How many humans can the earth hold?
How will we affect other species populations?
What happens when we reach our carrying capacity?
What is your “niche”?
Again, what is your (personal) niche?
What is the “human niche”?
What is a good metaphor to describe niches?
What has our niche done to our “population capacity”?
Does our niche affect an ecosystem differently than other organisms’ niches?
Individual (one person) or population impact by humans on the earth
Measured using energy consumption, land use and waste production
It is compared to the area’s biocapacity (what the earth has to give back)
What would be considered sustainable use of:
P301 #14 and 18
Other websites I have browsed… useful for STSE presentations…
http://www.pc.gc.ca/eng/docs/bib-lib/docs5hi.aspxther animal populations