Distribution of Organisms

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Environmental factors determine where...
an organism lives
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These include: Temperature, amount of water, availability of CO2 and Oxygen...
availability of nutrients and amount of light
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You can measure how common an organism is in two sample areas or...
study the distribution changes across an area
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By using a quadrat, you can do the first method and then find the...
mean by doing the total number of organisms / number of quadrats
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If you are asked to find the population size, get the answer by doing the previous equation, then...
multiply it by the total area
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Usin quadrats along a line is doing the same method before but...
only counting the species in the quadrat on the line
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1. Reliability - Quadrats are good tools for finding out if organisms are distributed but...
you have to make sure the results are reliable (repeatable and reproducible)
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You can do this by taking a larger sample size, as bigger samples are...
more represntative of the whole population
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Or use random samples, but note that this won't make the experiment...
reproducible
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2. Validity - To answer the original question, you need to...
control all the variables
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You need to answer whether a difference in distribution is due to...
an environmental factor
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If you don't control all the variables, you won't know if...
there is a pattern between the two and it won't give you valid data
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Other cards in this set

Card 2

Front

availability of nutrients and amount of light

Back

These include: Temperature, amount of water, availability of CO2 and Oxygen...

Card 3

Front

study the distribution changes across an area

Back

Preview of the back of card 3

Card 4

Front

mean by doing the total number of organisms / number of quadrats

Back

Preview of the back of card 4

Card 5

Front

multiply it by the total area

Back

Preview of the back of card 5
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