EES_YR3_LSN3A

EES_Y3_LSN3A
Evolution, Ecology & Sustainability
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Slide 1: Slide
BiologieMiddelbare schoolvwoLeerjaar 3

This lesson contains 22 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 30 min

Items in this lesson

EES_Y3_LSN3A
Evolution, Ecology & Sustainability

Slide 1 - Slide

Population size
immigration
emigration
death
birth

Slide 2 - Drag question

Population growth
Involves:
  1. Biotic potential: max reproduction rate given all the resources the population needs
  2. Environmental resistance: all factors that may limit growth. (scarcity of resources, predation, climate conditions etc)
  3. Carrying capacity: max population size that can be supported by a particular environment

Slide 3 - Slide

Population curves
  • J-curve: often seen in fast reproducing organisms that colonise a new environment. Exponential growth followed by hitting a limiting factor and often the population crashes
  • S-curve: Exponential growth until population hits environmental resistance and stabilises around the carrying capacity

Slide 4 - Slide

Carrying capacity
Environmental resistance
Few reproducing individuals
Exponential growth

Slide 5 - Drag question

What is population density?

Slide 6 - Open question

Environmental resistance
Can be:
  • Density indepent: these factors influence all organism in a population irrespective of population density. Can be biotic of abiotic
  • Density dependent: the influence of these factors on population size depend on the density of the population. Usually the higher the density the bigger the impact of these factors. Always biotic

Slide 7 - Slide

What is a square called that we use to sample populations?
A
grid
B
quadrat
C
cube
D
quarter

Slide 8 - Quiz

These four 1m2 squared quadrats were place in a 8m2 garden. Estimate the total population of flowers in the whole garden.
A
16
B
8
C
40
D
20

Slide 9 - Quiz

Which one of these is a correct assumption you need to make about a population between samplings?
A
It is a closed population
B
It won't rain between samplings
C
There are lots of deaths
D
There are lots of births

Slide 10 - Quiz

If 50 crabs were captured and marked and then released and then a few days later 25 were caught and of those 5 were marked. What would the estimate of the population be?
A
500
B
250
C
75
D
200

Slide 11 - Quiz

An area of 5m2 was sampled using a quadrat to find a total of 10 sunflowers. If the area of the field was 200m2 , what is the estimated number of sunflowers in the field?
A
20
B
40
C
400
D
2000

Slide 12 - Quiz

A factor that would increase the size of the population
A
Emmigration
B
Death Rate higher than Birth Rate
C
Birth Rate Higher than Death Rate
D
Drought

Slide 13 - Quiz

A factor that is more likely to affect crowded population much more than spread out population
A
Density dependent factor
B
Limiting factor
C
Natural disaster
D
Density independent factor

Slide 14 - Quiz

A factor that decreases the population or keeps it from increasing
A
Limiting factor
B
Food surplus
C
High birth rate
D
Carrying capacity

Slide 15 - Quiz

Example of a density independent factor
A
Natural Disaster
B
Disease
C
Resource Availability/Competition
D
Predators

Slide 16 - Quiz

What is the carrying capacity of the following graph?
A
Around 500
B
More than 500
C
Less than 500
D
Around 600

Slide 17 - Quiz

Slide 18 - Slide

Slide 19 - Slide

What is incorrect in the tolerance curve below?

Slide 20 - Slide

Slide 21 - Slide

Slide 22 - Slide