23.5 Measuring the distribution and abundance of organisms

Cards (14)

Define the term abundance
The number of individuals of one species in a particular area
Define the term distribution
Where a particular species is within the area you are investigating
How could you ensure that your sampling method is random?
Use a random number generator for coordinates
What is a transect?
A transect is a line across an area of land
Name 2 types of quadrat
Frame quadrat and point quadrat
How could you capture fish?
Use a net
How could you capture insects?
Use a sweep net
How could you capture butterflies?
Make a pitfall trap
Name 2 pieces of apparatus needed for calculating percentage cover of plant species
Frame quadrat and measuring tape(transect) (could have species index)
How can distribution of organisms be measured?
Using line or belt transect - non-random, systematic sampling
Should measuring distribution be random or non-random?
Non-random
Give the equation to calculate the estimated plant abundance within an area of 1m2.
(number of individuals in sample) ÷ (area of sample in m2)
What method is used to find the animal abundance in an area?
Capture-mark-release-recapture technique
Name an assumption you make when you use the mark-release-recapture method
Marking the organism does not impact its survival / no migration / organisms randomly distribute after first release

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