Sampling Flashcards
(30 cards)
What is sampling used for?
Measure biodiversity
Why do we use sampling?
As it would be too time consuming to count each individual in a habitat
What do we do instead?
So we can take a sample of the population which we can then make estimates of the whole habitat based on the sample.
What is the first step in sampling?
Chose an area to sample (small area with habitat)
What is the second step in sampling?
Count the number of individuals of each species
What is the third step in sampling?
Repeat the process and take as many samples as possible (at least 10)
What does this increase?
The vailidity
What is the fourth step in sampling?
Use results to estimate total number of individuals or total number of different species or both
What is the fifth step in sampling?
When comparing different habitats, use the same sampling techniques
Why do we use the same sampling techniques?
To increase validity
What two types of sampling?
Random or non-random
Why do we use random sampling?
to avoid bias
What is an example of random sampling?
On a field create grid and generate random coordinates
How many types of non-random sampling are there?
3
What are the 3 types of non-random sampling?
-Systematic
-Opportunistic
-Stratified
What is systematic sampling?
When samples are taken at fixed intervals often along a line
(transect)
What is opportunistic sampling?
Samples chosen by investigator-the data will be biased
What is stratified sampling?
Different areas in a habitat are identified and samples separately in proportion to their part of the habitat as a whole.
How can wind speed be measured?
Anemometer
How can light intensity be measured?
Light meter
How can relative humidity be measured?
Humidity sensor
How can pH be measured?
pH probe
How can temperature be measured?
temperature probe
How can oxygen content in water be measured?
Dissolved oxygen probe
