Exam 2 Lecture 14.5/15

Question 1

Intraspecific interactions equation

Answer 1

Delta N / Delta T

-Delta N = change in population
-Delta T = change in time

Question 2

Exponential growth model equation

Answer 2

Delta N / Delta T = r (N)

r = b - d

r: per capita rate of increase
b: per capita birth rate
d: per capita death rate
N: current population size

Question 3

Exponential growth model

Answer 3

-Population grows faster as it gets bigger
-Bigger r, steeper curve

Question 4

Carrying capacity

Answer 4

-Max population in given enviroment

Question 5

Logistic growth model equation

Answer 5

(K - N / K)

K = Carrying capacity
N = Current population

If K = N, no growth

Question 6

Logistic growth model

Answer 6

-Growth levels out at carrying capacity
-Fastest growth rate in the middle
-Populations aren’t perfectly stable at carrying capacity

Question 7

High density

Answer 7

-Less offspring
-K selected (Long term over reproduction)
-Top half of curve
-Density dependent (factors that affect pop growth)

-Higher death rates
-Lower birth rates

Question 8

Low density

Answer 8

-r selected (rapid reproduction over long term)
-Bottom half of curve
-Density independent (grows at a constant rate regardless)

-Lower death rates
-Either birth rates

Question 9

Survivor ship curve

Answer 9

1: High survival, few offspring, high parental care

2: Death rate constant throughout life, moderate offspring, some parental care

3: Low survival, Lots of offspring, low parental care, those that survive childhood live a long time