Studying Populations

Question 1

what characteristics are studied when looking at populations

Answer 1

size
density
dispersion
migration patterns

Question 2

what letter represents size?

Answer 2

N

Question 3

what letter represents density?

Answer 3

D

Question 4

what methods are used with studying populations?

Answer 4

• survey
• sampling
• tracking

Question 5

population definition

Answer 5

a group of individuals of one species that live in a particular area

Question 6

habitat definition

Answer 6

the specific environment in which an organism lives characterized by biotic and abiotic factors

Question 7

geographic range

Answer 7

the total area occupied by a population (spatial boundary)

Question 8

density definition

Answer 8

number of individuals per unit area or volume

Question 9

crude density definition

Answer 9

number of individuals in the total area of the habitat

Question 10

ecological density definition

Answer 10

number of individuals in the area actually used by the individuals

Question 11

types of population distribution

Answer 11

• clumped
• uniform
• random

Question 12

random dispersion definition

Answer 12

an individual has an equal probability of occuring anywhere in an area

Question 13

uniform definition

Answer 13

individuals are uniformly spaced through the environment

Question 14

clumped definition

Answer 14

individuals live in areas of high local abundance, which are separated by areas of low abundance

Question 15

what is a survey?

Answer 15

a count like a census

Question 16

what is sampling?

Answer 16

taking a measurement from a portion of the population and applying it to the whole

Question 17

tracking definition

Answer 17

monitoring / following an individual organism

Question 18

what are some sampling methods?

Answer 18

transect
quadrat
mark-recapture

Question 19

transect defintion

Answer 19

a straight line along which observations are made

Question 20

types of transects:

Answer 20

point
continuous
belt

Question 21

point sampling

Answer 21

“string is marked off at equal intervals to indicate where a count is to be taken”

Question 22

continuous sampling transect

Answer 22

the whole area along the line is counted

Question 23

resource distribution in clumped dispersion

Answer 23

uneven

Question 24

resource abundance in clumped dispersion

Answer 24

abundance in the clumps

Question 25

Interaction between individuals in clumped dispersion

Answer 25

positive and negavtive

Question 26

examples of clumped dispersion

Answer 26

muscles, schools of fish

Question 27

resource distribution in radom dispersion

Answer 27

uniform

Question 28

resource abundane in random dispersion

Answer 28

abundant

Question 29

interaction between individuals in random dispersion

Answer 29

neutral

Question 30

radom dispersion examples

Answer 30

• weeds
• rainforests

Question 31

resource distribution in uniform dispersion

Answer 31

uniform

Question 32

resource abundance in uniform dispersion

Answer 32

scarce

Question 33

interaction between individuals in uniform dispersion

Answer 33

neutral

Question 34

types of organism studied with quadrat

Answer 34

small, sessile, slow

Question 35

types of organism studied with transect

Answer 35

large, mobile

Question 36

types of organism studied with mark-recapture

Answer 36

large, mobile

Question 37

advantage of the quadrat method

Answer 37

easy+cheap

Question 38

advantage of the transect method

Answer 38

can cover changing terrain, not good for clumped dispersion

Question 39

advantage for mark-recapture method

Answer 39

good for mobile creatures

Question 40

limitations of quadrat method

Answer 40

• harder if they live in clumps
• can’t use in water
• can’t use on hilly terrain

Question 41

limitations of the transect method

Answer 41

• more expensive
• labour intensive
  bc it covers more land

Question 42

mark-recapture limitations

Answer 42

• learned responses
• deaths + births
• too smart
• migration