Chapter 2 Lesson 2 Flashcards
When is growth positive?
When the births + immigration > deaths + emigration
When is there no growth?
When the births + immigration = deaths + emigration
When is growth negative?
When the births + immigration < deaths + emigration
What does t stand for?
Maximum per capita (individual) rate of growth
How do you calculate r?
Growth/Individuals | (births - deaths) / Original size of population
If a moose population has 15 moose to start with, and after 5 years, 52 are born and 7 die. What is the growth / capita (r)?
3 growth / capita
When does an environment have exponential growth?
When there is an ideal environment without limiting factors
What are some examples of exponential growth in environments?
- Invasive Species
- Protected Species
What is the exponential growth equation?
dN / dt = rN
What does N stand for?
Population Size
What does dN / dt stand for?
Growth Rate (Change in population size / change in time)
What does t stand for?
Time
What does No stand for?
Initial population size
What does K stand for?
Carrying capacity, the maximum population size that environment can support without degrading the habitat
What is the equation for logistic growth?
dN / dt = rN((K - N) / K)
How do you find the carrying capacity (K)?
Highest growth / 2
What are the two types of limiting factors?
Density Dependent & Density Independent
What are Density Dependent limiting factors?
Factors that only have a major impact on population growth when the population is more and more dense
What are Density Independent limiting factors?
Factors that have a major impact of population growth all of the time
What are some examples of Density Dependent factors?
- Biotic Factors
- Competition
- Deseise
What are some examples of Density Independent factors?
- Abiotic Factors
- Droughts
- Floods
What is carrying capacity?
The amount of organisms in a population that a specific area can support
