BIOL385 MARINE BIOLOGY EXAM 3 [1] QUESTIONS
WITH COMPLETE VERIFIED SOLUTIONS
[Marine Ecology]
What is ecology?
Interaction between organisms and their environment.
What do populations require for survival?
Space.
What are limiting resources?
Resources that affect the growth of a population.
What are four examples of limiting resources?
Space (habitat).
Nutrients.
Mates.
Energy for trait allocation.
What is carry capacity?
A maximum number of individuals that any habitat can support.
What happens to the growth rate as population becomes more crowded?
,Growth rate of the population will decrease.
When does exponential growth occur?
When populations can experience a rapid increase in population size under ideal
conditions.
What is the formula for exponential growth?
What do the variables represent?
Nt = Noe^rt
e = 2.72.
Nt = size of future population.
No = current size of population.
r = population intrinsic growth rate.
t = amount of time over which the population grows.
What is the population intrinsic growth rate?
Birth - death per generation.
What is the difference between geometric and exponential growth rates?
Geometric growth rate uses lambda ℷ.
What is lambda?
,Ratio of a population's size in 1 year to its size in the preceding year.
What does the incorporation of lambda affect in accuracy between geometric
growth models compared to exponential growth models?
Why does this happen?
Geometric growth becomes more accurate than an exponential growth function.
Due to geometric growth models comparing population sizes via time intervals.
What is the formula for geometric growth?
What do the variables represent?
Nt = N0 ℷ^t
Nt = size of future population.
N0 = current size of population.
t = time.
ℷ = ratio of population's size in 1 year to its size in the preceding year.
What is the outcome when Lambda < 1 and r < 0?
Negative slope.
What is the outcome when Lambda = 1 and r = 0?
, No change.
What is the outcome when Lambda > 1 and r > 0?
Positive slope.
What is logistic growth in relation to exponential and geometric growth?
Realistic limitation of exponential and geometric growth.
What shape does the logistic growth follow?
S-shaped curve.
What is present in logistic growth models?
Inflection point.
What does the inflection point represent?
The fastest growth after which growth begins to slow.
What is the formula for logistic growth?
dN/dt = rN (1 - N / K).
What do the variables represent in dN/dt = rN (1 - N / K)?
N = population size.
r = intrinsic growth rate.
dN / dt = rate of change in population size.
k = carrying capacity.
What formula is used to calculate the current population in logistic growth
models?
WITH COMPLETE VERIFIED SOLUTIONS
[Marine Ecology]
What is ecology?
Interaction between organisms and their environment.
What do populations require for survival?
Space.
What are limiting resources?
Resources that affect the growth of a population.
What are four examples of limiting resources?
Space (habitat).
Nutrients.
Mates.
Energy for trait allocation.
What is carry capacity?
A maximum number of individuals that any habitat can support.
What happens to the growth rate as population becomes more crowded?
,Growth rate of the population will decrease.
When does exponential growth occur?
When populations can experience a rapid increase in population size under ideal
conditions.
What is the formula for exponential growth?
What do the variables represent?
Nt = Noe^rt
e = 2.72.
Nt = size of future population.
No = current size of population.
r = population intrinsic growth rate.
t = amount of time over which the population grows.
What is the population intrinsic growth rate?
Birth - death per generation.
What is the difference between geometric and exponential growth rates?
Geometric growth rate uses lambda ℷ.
What is lambda?
,Ratio of a population's size in 1 year to its size in the preceding year.
What does the incorporation of lambda affect in accuracy between geometric
growth models compared to exponential growth models?
Why does this happen?
Geometric growth becomes more accurate than an exponential growth function.
Due to geometric growth models comparing population sizes via time intervals.
What is the formula for geometric growth?
What do the variables represent?
Nt = N0 ℷ^t
Nt = size of future population.
N0 = current size of population.
t = time.
ℷ = ratio of population's size in 1 year to its size in the preceding year.
What is the outcome when Lambda < 1 and r < 0?
Negative slope.
What is the outcome when Lambda = 1 and r = 0?
, No change.
What is the outcome when Lambda > 1 and r > 0?
Positive slope.
What is logistic growth in relation to exponential and geometric growth?
Realistic limitation of exponential and geometric growth.
What shape does the logistic growth follow?
S-shaped curve.
What is present in logistic growth models?
Inflection point.
What does the inflection point represent?
The fastest growth after which growth begins to slow.
What is the formula for logistic growth?
dN/dt = rN (1 - N / K).
What do the variables represent in dN/dt = rN (1 - N / K)?
N = population size.
r = intrinsic growth rate.
dN / dt = rate of change in population size.
k = carrying capacity.
What formula is used to calculate the current population in logistic growth
models?
