Flashcards in Lab 4: Population Growth Models: Logistic Growth Deck (12):

1

## Carrying capacity (K)

### represents the maximum # of individuals a given environment can support. K for a population is usually given as a # of individuals/unit area

2

## Logistic or sigmoid growth:

### Type of population growth which leads to a stable and sustainable population size.

3

## The value for r in a population at carrying capacity =

### 0

4

## if r = 0 what happens to the birth and death rates.

### b and d respectively must become equal. Either caused by the sharp increase in death rates as population approaches the carrying capacity or also come about by a decline in the birth rate as stress reduces the ability of females to reproduce.

5

## What happens when population goes above K?

### r can become negative as deaths outstrip births causing the population to move back to its carrying capacity.

6

## Nt=

### K/ 1+(K/No - 1) e^-rmt

7

## -rmt=

### ln((K-Nt)/((NtK-NtNo)/No)

8

## In the game we played in class birth rates are ----- and death rates are -----

### birth rate is constant and death rates increases.

9

## how is exponential growth and logistic growth different in rate of growth.

### In exponential growth the rate of growth (rm) remains constant and is not affected by changes in population density. Environment is constant. In logistics growth rate steadily declines.

10

## If the environment is constant

### K is an equilibrium level around which the population may fluctuate if the environment is constant.

11

## Equation for yield we can remove?

### triangle N= Nt-No

12