Sampling techniques

What type of population would you ESTIMATE using a quadrat?

• 
• 
• 
• 

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Limpets were found in 25 out of 50 quadrats. What percentage of quadrats contained limpets?

• 100%

• 25%

• 50%

• 75%

Tags

NGSS.MS-LS2-1

Ten 1m² quadrats were placed in a 40m² field. On average 2 snails were found in every quadrat. Estimate the population size of the whole field.

• 2

• 10

• 40

• 80

• 20

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following is true about quadrats?

• quadrats should be placed randomly so that a representative sample is taken

• you should look at the results from several quadrats in an area to reduce the effect of an unusual distribution

• the results are more reliable when you look at the results from many quadrats

• All the above are true

Unbiased sampling is:

• when you choose the group you think will represent the sample
• when any member of the population is equally likely to be chosen for the sample

Limiting Factor

• number of births in a population in a certain amount of time

• an environmental factor that causes a population to decrease

• approximation of a number, based on reasonable assumptions

• number of individuals in an area of specific size

Population Density

• approximation of a number, based on reasonable assumptions

• moving into a population

• number of deaths in a population in a certain amount of time

• number of individuals in an area of specific size

The presence, absence or abundance of what form of species can be used to monitor an ecosystem?

• Model Species

• Indicator Species

• Highlighter Species

• Monitor Species

What is a Belt Transect?

• A way of sampling a changing habitat

• A way of sampling a non-changing habitat

• A way of keeping up your pants

Lines are drawn on a map and individuals occurring on those lines or belts are sampled

• transects
• quadrats
• point sampling
• mark and recapture