quadrats Flashcards
1
Q
quadrat
A
used to sample ground plants in an area
usually square sometimes circle
have to be placed randomly eg randomly generate grid coordinates
2
Q
gridded quadrat
A
used to estimate percentage cover eg if 1/25 squares have a plant in thats 4%
more accurate the more squares
3
Q
transect
A
- like across a habitat
- used to observe how an organism changes across an area and along the line eg how plants change further from a tree
- at regular intervals place a quadrat along the transect and count the organisms the
4
Q
sampling methods
A
pitfall trap
sweep netting
pooter
longworth trap
5
Q
pitfall trap
A
- small jar in ground lightly covered with stones or leaves + holes in bottom to allow water drainage
- passive
6
Q
sweep netting
A
- long net to collect invertebrates
- walk through field sweeping net in a regular fashion
- active
7
Q
pooter
A
- a jar with two straw one placed over insect to suck it in other in mouth to suck
- actuve
8
Q
long worth trap
A
- humane metal trap to collect live animals
- animals tempted in using food then trapped by a door
- passive
9
Q
capture recapture
A
- capture populating using a sampling method (pooter, net etc. )
- number caught is recorded and individuals are marked (safely/ humanely)
- sample released
- later the pop is sampled again using same technique
- total number caught on second sample is recorded and number marked recorded
- population size = (no. 1st sample x 2nd. sample)/ (no. in 2nd that were marked)
10
Q
what assumptions are made in capture recapture
A
- animals don’t move in/ out, die or are born
- markings stay in
- marking doesn’t increase / decrease survival chance eg reduce camouflage
- organisms have long enough to distribute themselves before second capture
