population regulation

Question 1

Why do most species maintain relative stability over time?

Answer 1

Limitation vs. regulation
- variation in DD and DI
Ideal free and ideal despotic distributions

Question 2

Limitation

Answer 2

abiotic factor
example time water generally a physical barrier (not always)
no negative feedback loop
there is a cap

Question 3

Regulation

Answer 3

There is a negative feedback

When you deviate it regulates you back to normal

Question 4

Two principles of population regulation:

Answer 4

1. No closed population stops growing unless per capita B or D rate declines with density
2. Differences in density can arise from variation in DD or DI per capita B and D

Question 5

ideal free distributions

Answer 5

which animals distribute themselves among several patches of resources. The theory states that the number of individual animals that will aggregate in various patches is proportional to the amount of resources available in each

Question 6

Assumptions of age class compostion

Answer 6

1. survival rate constant for each class
2. all year classes recruited at same abundance
3. all year classes sampled equally by the gear/method

Question 7

What does the slope of the catch curve tell us?

Answer 7

The estimate of mortality

Question 8

Equation for the Finite annual survival

Answer 8

St=Nt+1/Nt

Question 9

how to calculate finite survival

Answer 9

S= T/(R+T-1)

T= # of individuals in an age class
R= sum of Nt 
Nt= # in age class

** Helps get around the assumptions