Populations: Difference between revisions

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{{Rinfo
|type= Lesson idea


{{Rinfo
|attribution={{Sara Hennessy}} {{OpenLearn}}
|title=Populations
|title=Populations and ecosystems
|topic=Animal populations and ecosystems
|topic=Populations, Ecology
|subject=Ecology
|subject=Science
|resourcenumber=SC0034
|resourcenumber=SC0034
|age=Secondary
|age=Secondary
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|tagline=Rabbits and vegetation - a real population case study
|tagline=Rabbits and vegetation - a real population case study
|content=A study of the factors affecting the rabbit population of the North and South Downs in England.
|content=A study of the factors affecting the rabbit population of the North and South Downs in England.
|strategy=Learning objectives are met using the following approaches:
* brainstorm ({{tag|whole class}})
* looking at graphs (small {{tag|group work}})
* case study (whole class teaching and {{tag|discussion}})
* concept mapping (whole class activity)
|Learning Objectives=Students should develop an understanding of the fragility and instability of ecosystems and be able to express an opinion on how much interference humans should make to protect one species or habitat.
|Learning Objectives=Students should develop an understanding of the fragility and instability of ecosystems and be able to express an opinion on how much interference humans should make to protect one species or habitat.
|additional resources=
|additional resources=
Line 21: Line 18:
|format=PDF
|format=PDF
|resources=
|resources=
* [[File:K507 1 mod4 chap6.pdf]]
* [[Populations/Teacher Notes|Teacher Notes in WikiText format]]
* http://labspace.open.ac.uk/mod/oucontent/view.php?id=426185&section=1.2.4
* [[File:K507 1 mod4 chap6.pdf]] (the original file is from the OU's OpenLearn Breakthrough series, available [http://labspace.open.ac.uk/mod/oucontent/view.php?id=426185&section=1.2.4 here]
|final=yes
}}
}}
[[File:Populations1.png|border|340x340px| | Preview snapshot of Chapter 6]]
[[File:Populations1.png|border|340x340px| | Preview snapshot of Chapter 6]]
 
[[Category:Secondary]][[Category:Science]][[Category:External Resource]][[Category:Ecosystems]]
=Teacher's Notes=
Science Book: living environment page 56
Topic: Animal populations and ecosystems
 
==Introductory Activity - BRAINSTORM - whole class==
 
Q. What factors affect animal population numbers in the wild?
 
Probe – positive and negative factors
Responses – food availability, pollution, weather conditions, water levels, disease, predators, etc
Encourage pupils to build on what others have said and to say whether they agree with peer comments (building dialogue skills).
 
==Introductory Activity - LOOKING AT GRAPHS - pairs/groups==
 
Project or print the two graphs in figures 19 & 20. Teacher note: see text between and after the graphs.
Look at the graphs of human and great tit populations and discuss:
 
Q. Tell the story of the graphs; what do they show?
 
Q. What factors might explain the changes in numbers over time?
 
Brief plenary.
 
==Activity 3 - CASE STUDY==
Case study of rabbits grazing on the North and South Downs of England (whole class teaching and discussion). Teacher note: see text p. 58-61
Show Fig. 22 Colonising chalk downlands and talk through it using Q&A. E.g.
 
Why might ground be completely bare? (clearing for agriculture, over-grazing, fire, volcano, quarrying)
What happens over time?
 
Introduce succession as a predictable sequence of change. Point to grassland, shrubland, woodland. Chalk grassland would become woodland if left… why hasn’t that happened in the Downs?
 
What is the role of the rabbit (or sheep)? Grazing prevents trees developing…
Why do farmers and vegetable growers install rabbit-proof fences?
Why do certain plants increase and others decrease in number when rabbits are present?
 
Human intervention: tell the story of myxomatosis and its devastating effect on the rabbit population. (Play the song “Bright Eyes” if you want!) Explain that it ultimately died out.
What other animals might have been negatively affected by the virus? Why?
- predators of rabbits, grassland dwelling birds, rabbit hole inhabitants
What animals might have been positively affected by the virus?
- competitors
What happens when there are no animals grazing?
Discuss the positive effects of grazing – biodiversity.
 
The above Qs can be discussed in groups to get pupils thinking.
 
==Activity 4 - CONCEPT MAP - Whole class ==
see Fig. 24 mapping interrelationships between rabbits and other organisms on downland
 
This could be done on the IWB as it exploits the interactive nature of the technology. Provide each organism as a labelled object on the board. Ask pupils to suggest links. You may want them to work on this in groups at tables first (using paper or min-whiteboards), with one group then demonstrating their representation on the IWB, for constructive critique and extension by others.
 
Introduce the notion of natural selection after this. Teacher note 1 – p.62.
Q. What other examples of natural selection can you think of?
Managing the downlands - Teacher note 2 – p.62.
 
Conclusion: change in ecosystems upsets the whole balance… fragility and instability
How much interference should humans make to protect one species or habitat?
 
[[Category:Secondary]][[Category:Science]][[Category:Teacher Education]][[Category:External Resource]]

Latest revision as of 16:38, 2 February 2015

Populations0.png
Rabbits and vegetation - a real population case study

Lesson idea. A study of the factors affecting the rabbit population of the North and South Downs in England.

Teaching approach. Learning objectives are met using the following approaches:

  • brainstorm (whole class(ta))
  • looking at graphs (small group work(ta))
  • case study (whole class teaching and discussion(ta))
  • concept mapping (whole class activity) (edit)
Resource details
Title Populations and ecosystems
Topic [[Topics/Populations|Populations]],  [[Topics/Ecology|Ecology]]
Teaching approach

[[Teaching Approaches/Whole class|Whole class]],  [[Teaching Approaches/Group work|Group work]],  [[Teaching Approaches/Discussion|Discussion]]

Learning Objectives

Students should develop an understanding of the fragility and instability of ecosystems and be able to express an opinion on how much interference humans should make to protect one species or habitat.

Format / structure

PDF

Subject

[[Resources/Science|Science]]

Age of students / grade

[[Resources/Secondary|Secondary]]


Useful information

Uses content from the Breakthrough to Mathematics, Science and Technology Series.


Files and resources to view and download


Preview snapshot of Chapter 6

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