assessing ecosystems.

Question 1

2 experimental tools for looking at ecosystems and populations include:

Answer 1

transects and quadrats

Question 2

what can transects be used for?

Answer 2

investigating the effect of a factor on the distribution of a species.

Question 3

what’s a transect line?

Answer 3

a piece of tape that’s stretched across the habitat of interest.

Question 4

how are quadrats placed during the investigation?

Answer 4

at regular intervals along the transect line.

Question 5

what are quadrats?

Answer 5

square frames that can be used to estimate population sizes

Question 6

what are quadrats used for?

Answer 6

estimating population sizes

Question 7

Organism Abundance->
When discussing organism abundance, the following terms may be used:

Answer 7

the mean
the median
and the mode.

Question 8

what’s the median?

Answer 8

the middle value in a numerically ordered series of numbers.

Question 9

what’s the mode?

Answer 9

the most common value in a numerically ordered series of numbers.

Question 10

population samples with quadrats:

Answer 10

estimated population size= number of individuals counted×
area sampled/
total survey area
​

Question 11

true or false. when estimating population sizes using quadrats, counting the no. of times a species touches the quadrat frame is not a suitable method for evaluating the quadrat contents.

Answer 11

true