Topic 17 - Practical skills

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DAFOR scale
A qualitative scale that judges the abundance of organisms.
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Dependent variable
The factor where the results are measured.
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Homogenous
Evenly mixed.
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Hypothesis
The theory or explanation that is being investigated.
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Independent variable
The factor that is deliberately altered or measured to see if it affects the dependent variable.
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Lincoln index
A catch, mark, release, recapture method to estimate animal populations.
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Null hypothesis
The no-link theory against which the hypothesis is being tested.
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Pitfall trap
A method of sampling animal populations by collecting individuals that fall into the traps set into the ground.
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Pooter
A mouth-suction device used to pick up invertebrates in soil or leaf litter.
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Quadrat
An area, usually square or circular, in which samples are taken.
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Secchi disc
A circular disc divided into four black and white segments that is used to estimate water turbidity.
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Surber sampler
An aquatic invertebrate sampling frame ad net that provides more quantitative data than kick sampling.
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Transect
A line or belt of sampling sites across an area.
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Tullgreen funnel
A piece of equipment used to extract invertebrates from soil or leaf litter.
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Other cards in this set

Card 2

Front

The factor where the results are measured.

Back

Dependent variable

Card 3

Front

Evenly mixed.

Back

Preview of the back of card 3

Card 4

Front

The theory or explanation that is being investigated.

Back

Preview of the back of card 4

Card 5

Front

The factor that is deliberately altered or measured to see if it affects the dependent variable.

Back

Preview of the back of card 5
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