Lab Exam 1

Question 1

species richness

Answer 1

the total number of different species within a community

Question 2

population density

Answer 2

the amount of individuals from a species in a given area

Question 3

percent cover

Answer 3

used for plants instead of population density since individuals are hard to distinguish

Question 4

species frequency

Answer 4

the number of quadrats a species appears in

Question 5

control variables

Answer 5

must be kept constant in an experiment

Question 6

treatment groups

Answer 6

the different range of intensities used in an experiment

Question 7

replicates

Answer 7

repeated samples to assure reproducibility of results

Question 8

control groups

Answer 8

independent variable is not varied

Question 9

negative control

Answer 9

does not show the effects of treatment, baseline for what a non-response looks like

Question 10

positive control

Answer 10

known to show a response, serves as a baseline for what a response would look like

Question 11

shannon’s diversity index

Answer 11

H’=-sumpi(lnpi)

Question 12

evenness

Answer 12

E=H’/lnS

Question 13

simpson’s index of diversity

Answer 13

D= 1-sum(pi^2)