investigating populations Flashcards
1
Q
define distrbution
A
where a particular species is within an area
2
Q
define abundance
A
number of individuals of one species in a particular area
3
Q
name 3 ways to estimate abundance
A
- count number of individuals in sample
- frequency
(50% samples contained A but only 20% contained B) - % cover
(non motile/slow moving)
4
Q
what type of organisms do you use percentage cover for
A
non motile/slow moving
5
Q
what are 2 ways of collecting the data needed to calculate percentage cover
A
- random sampling (using a quadrat or along a belt transect)
- mark-release-recapture
6
Q
what type of organisms do yo use random sampling for
A
slow moving/ non motile
7
Q
what type of organism do you use mark-release-recapture for
A
mobile organisms
8
Q
name 3 ways to make your results you have collected reliable
A
- random samples
(random number generator - avoids bias) - repeats
(reduces likelihood that results are due to chance) - calculate a mean
