Population Ecology

Question 1

Population

Answer 1

a group of organisms of the same species living in the same place

Question 2

Population Density

Answer 2

measures the # of individual organisms in a defined space
Affected by:
-Birth
-Immigration
-Death
-Emigration

Question 3

Survivorship Curves: Type 1

Answer 3

late loss, heavy parental care
Ex. humans

Question 4

Survivorship Curves: Type 2

Answer 4

constant loss, death unaffected by age
Ex. some birds, rodents

Question 5

Survivorship Curves: Type 3

Answer 5

early loss, produce lots of offspring at once and many die right away
Ex. fish, mosquitoes

Question 6

Population Dispertion

Answer 6

Random: dots anywhere
Uniform/ Even: in a specific line-up
Clumped: dots in groups

Question 7

Population Growth

Answer 7

Exponential: no limit to growth (ex. humans)
Logistic: population grows quickly then levels off (ex. most natural populations) (has a carrying capacity)

Question 8

Carrying Capacity

Answer 8

the theoretical maximum population that a given environment could support

Question 9

Limiting Factors

Answer 9

aspects of the environment that limit the size a population can reach
Biotic: living (ex. parasitism, predation)
Abiotic: non-living (ex. temp, weather)

Question 10

Density-dependent

Answer 10

these limiting factors have a bigger impact on more dense populations
-triggered by an increase in population, thus, crowding
-ex. competition, predation, disease

Question 11

Density-independent

Answer 11

regulate population growth regardless of density
-all species are affected equally (mostly)
-ex. weather changes, pollution