what determines population size Flashcards
what is carrying capacity
maximum population size that can be maintained over a period in a habitat
what is a limiting factor
factor whose magnitude slows down the rate of a natural process
what are the two rates to focus on in population size
birth rates
death rates
what are the 4 phases of population growth
lag
log
stationary
death
what is lag phase
individuals are acclimatising to the habitat.
reproduction rate is slow
what is log phase
plenty resources
reproduction rate is rapid
birth rate exceeds death rate
stationary phase…
population growth has reached carrying capacity
death rate and birth rate are equal.
population growth is stable
what are the two types of limiting factor
density dependent
density independent
what type of factors are density dependent
biotic factors
competition, predation, disease, food
what types of factor are density independent factors
abiotic
climate
natural disaster- earthquake, volcano
what are the two type of strategist
r- strategies
k-strategies
what are k strategists
large mammals or plants
what are features of a k strategie
low reproductive rate
large body mass
climax species
low mortality
predators
what are the features of a r strategist
small body mass
high reproductive rate
pioneer species
high mortality
prey
what is the death phase
Where the mortality rate is higher than the birth rate in a population.
Caused by excessive build-up of waste products, or not enough resources s to survive as carrying capacity has been exceeded
