Population Ecology (PPT6) [U3/ T2] Flashcards
What is the formula for mark, recapture and the Lincolns index?
N= M x n
———
m
What does each letter stand for in the Lincolns index?
M= number of individuals caught marked and released
n= number of individuals caught on second sampling
m= number of recaptured individuals marked
Define the term carrying capacity (K)?
The size the population can be supported indefinitely on available resources and services of the ecosystem.
The carrying capacity (K) is determined by the most limiting factor, this can change over time.
Define population density
The number of individuals per unit area or volume.
What is the formula to calculate population density?
Population density = Number of individuals
———————————
Unit area
Define Natality
Birth rate - the number of individuals born per unit time
Define Mortality
Death rate - number of individuals dying per unit time
Define Migration
Movement - the number of organisms moving in or out of the population
Define Immigration
Movement of organisms into an area
Define Emigration
Movement of organisms out of an area
What is the formula to calculate population size?
Births - deaths + immigration - emigration
B - D + I - E
Define limiting factors
The factors that limit growth, abundance or distribution of an organism or population.
What factors can affect carrying capacity
- Abiotic
- Biotic
- Density-dependent
- Density independant
What are some abiotic factors?
- Nutrients
- Shelter
- Light
- Water
- pH
What are some biotic factors
- Competitors
- Preditors
- Number of mates
- Food availability
- Disease
