sampling ecosystems pt 2

Question 1

when is random sampling used

Answer 1

when habitat is homogenous

Question 2

when is opportunistic sampling used

Answer 2

when decisions have to be made during sampling

Question 3

when is stratified sampling used

Answer 3

when treating some parts of the habitat differently

Question 4

when is systematic sampling used

Answer 4

when samples have to be taken at fixed intervals

Question 5

what does sampling depend on

Answer 5

-accuracy required
-nature of sampling organisms
-size of sampled area
-available time

Question 6

where should u place quadrats and how many samples should you take

Answer 6

-randomly place quadrats across habitat using random numbers to plot coordinates for each one
-take samples at regular distances across habitats so u sample every part of habitat to same extent

Question 7

how to equate population size of species

Answer 7

mean number of individuals in each quadrant/ fraction of total habitat area covered by single quadrant

Question 8

advantages of using a continuous belt transect over a line transect

Answer 8

-more detailed and comprehensive data
-more accurate

Question 9

disadvantages of using a continuous belt transect over a line transect

Answer 9

-time consuming
-observer error
-not always necessary in uniform habitats

Question 10

advantages of using continuous over a interrupted belt transect

Answer 10

-more complete data collection
-so more accuracy and resolution
-reduce sampling bias

Question 11

disadvantages of using continuous over a interrupted belt transect

Answer 11

-time consuming
-inefficient in uniform habitats