Studying ecosystems

  • Created by: Esme.B
  • Created on: 28-02-18 12:52
Why do ecologists sample ecosystems?
It would take too long and require too much manpower to study a whole habitat
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Definition of 'point sampling'?
Sampling a geographical area by selecting points. (Points at random)
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What size is a 'Quadrat'?
1m2
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What X2 types of data do 'Quadrats' collect?
1). Distribution: presence or absence of each species 2). Abundance: No. of individuals or % cover
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What is a 'Point quadrat'?
Point quadrats make estimate more accurate as estimating % cover is difficult.
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What X2 types of sampling can be used to be able to 'Place quadrats' with biases?
1). Random sampling 2). Systematic sampling
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What is 'Random sampling'?
1). Lay out 2 tape measures to form axes 2). Use a calculator/random number table to generate pairs of random numbers for coordinates
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What is 'Systematic sampling'?
????
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When is a 'Cumulative frequency table' used?
Used to determine how many samples to take in a habitat to give an accurate representation.
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What's the formula of 'Estimating population size'?
Population size = mean no. of individuals of the species in each quadrat / fraction of the total habitat area covered by a single quadrat
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What is a 'Transect'?
Used to look at changes in abundance and distribution across a habitat
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What are the X2 approaches to using a 'transect'?
1). Line Transect 2). Belt Transect
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What is a 'Line Transect'?
At regular intervals, make a note of which species is touching the tap.
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What are the X2 types of 'Belt Transect'?
1) interrupted belt transect 2). Continuous belt transect
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What is a 'Interrupted Belt Transect'?
At regular intervals, place a quadrat next to the line and study each.
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What is a 'Continuous belt transect'?
Place a quadrat next to the line, moving it along the line after looking at each quadrat.
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What is a 'Kite diagram'?
Represent distribution and abundance of different species along a transect line.
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Other cards in this set

Card 2

Front

Definition of 'point sampling'?

Back

Sampling a geographical area by selecting points. (Points at random)

Card 3

Front

What size is a 'Quadrat'?

Back

Preview of the front of card 3

Card 4

Front

What X2 types of data do 'Quadrats' collect?

Back

Preview of the front of card 4

Card 5

Front

What is a 'Point quadrat'?

Back

Preview of the front of card 5
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