Lecture 12 Flashcards
1. Define population and population ecology 2. Describe the four processes that can lead to a change in the number of individuals in a population (N) 3. Explain: i. the difference between total and per capita rates ii. how density-independent per capita rates lead to exponential/geometric growth (38 cards)
What is a population?
a group of potentially interbreeding individuals of a single species inhabiting a specific area
What is population ecology?
The study of the spatial
and temporal patterns in the abundance and distribution of organisms and the mechanisms that produce those patterns
Why study populations?
- Conservation
- Pest management
- Harvest management
- Invasive species
Whats N?
Population size
What is Nt?
Population size at time t
What is Nt+1?
Population size on time step ahead
What will cause N to change?
- Vital rates
- Movement
What’s inside vital rates?
Births and deaths
What’s inside movement?
Inmigration and emigration
What does closed populations have?
Births and deaths
How is a single population?
Spatially isolated
What is a metapopulation?
Network of population
What does open populations include?
Births, deaths, emigrations and immigration
What are total rates?
They describe the rate for the total population
How are total rates denoted?
By capital Letters, ex. B
What is per Capita Rates?
Describes the rate for an individual
Which ones are the units of total rates?
Births/t
How are denoted per capita rates?
By lower case letters. ex. b
Which ones are the units for per capita rates?
Births/ind*t
Which one is the relation between per capita and total rate?
- B = bN
- D = dN
- I = iN
- E= eN
How do you obtain the total rate?
Multiply the per capita rate by the total population abundance
What is capita rate?
What happens in a population without having the whole population
What we can summarize in a close population?
The net balance of per capita births and deaths (b-d) in the parameter r
What is r?
The per capita rate of increase (instantaneous). Its the same as b - d
