11.3 Sampling Techniques Flashcards
1
Q
Which techniques may be used to sample animals?
A
- POOTER
- Device used to capture insects.
- SWEEP NETS
- Used to catch insects in long grass.
- PITFALL TRAP
- Used to catch small, crawling invertebrates.
- TREE BEATING
- Tree is shaken, species in tree fall onto large white cloth.
- KICK SAMPLING
- River bed/bank kicked to disturb substrate. Downstream net catches dislodged species.
2
Q
How can a quadrat be used to sample plants?
A
- POINT QUADRAT
- Frame containing horizontal bar.
- Pin pushed through, plant species touching the pin are recorded.
- Pin is moved along set intervals & process repeated.
- FRAME QUADRAT
- Square frame divided into grid.
- Type & number of species in each grid is recorded.
3
Q
To collect the most valid, representative sample of the abundance of organisms in an area, quadrats should be used alongside a [random/non-random] sampling technique.
A
random
4
Q
To study how the presence & distribution of organisms across an area varies, quadrats should be with a ____.
A
line transect / belt transect
5
Q
In which ways can a frame quadrat be used to sample plant populations?
A
- DENSITY
- count number of plants present in 1m x 1m quadrat, indicates number of plants per m2
- FREQUENCY
- count number of squares in which species is present.
- PERCENTAGE COVER
- estimate of percentage of area covered by a species within the quadrat.
6
Q
What are abiotic factors?
A
non-living conditions
in a habitat
7
Q
What are examples of abiotic factors?
A
- Wind speed
- Light intensity
- Humidity
- pH
- Temperature
8
Q
What are the advantages of using sensors for measuring abiotic factors?
A
- Can detect rapid changes
- High precision
- Data can be stored & tracked on computer