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Ecology 6,4
Today's lesson
Discuss the pyramid of numbers and biomass
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Biologie
Middelbare school
havo
Leerjaar 2
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Today's lesson
Discuss the pyramid of numbers and biomass
Start on a summary
Slide 1 - Slide
6,4 Ecological pyramids
Simplify!
A food web is too complicated to study in detail
Break it down into producers, consumers, and so forth
See a food chain graphically to better understand relationships between organisms.
Slide 2 - Slide
Slide 3 - Slide
Pyramid of numbers:
The amount of individual organisms in the community reflected in a pyramid.
Each trophic level of a food chain is represented with a bar.
The amount of individuals in each trophic level is represented by the size of the bar.
Slide 4 - Slide
Slide 5 - Slide
Slide 6 - Slide
Pyramid of biomass:
The total biomass of all organisms in the community reflected in a pyramid.
The total biomass of each trophic level of a food chain is represented with a bar.
The amount organisms in each trophic level is multiplied by the mass of each individual to get the biomass.
Slide 7 - Slide
Slide 8 - Slide
This is a pyramid of ...
A
numbers
B
biomass
C
it is not a pyramid
D
it can be both a pyramid of numbers and of biomass
Slide 9 - Quiz
What does the pyramid of biomass show?
A
The biomass of one animal
B
The biomass in a link in the food chain
C
The number of organisms in a link in the food chain
Slide 10 - Quiz
a pyramid of numbers has always the shape of a pyramid
A
correct
B
incorrect
Slide 11 - Quiz
What did we learn?
1. The water cycle
2. The carbon cycle
3. Pyramid of numbers
4. Pyramid of biomass
To Do:
Read 6,4 and Do Qs 15 and 16
Read 6,9 and Do Qs 30 and 31
Slide 12 - Slide
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