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Factors Influencing Population Size - Coggle Diagram
Factors Influencing Population Size
immigration
arrival of new residents that were previously in another population
emigration
departure of individuals who take up permanent residence elsewhere
births and deaths
zero population growth
number of births and deaths are equal
measured in terms of rates per individual or per capita
per capita growth rate: b (per capita birth rate) -- d (per capita death rate) = r (per capita growth rate
biotic potential
growth rate for a population under ideal conditions
density factors
density-dependent limiting factos
factor that limits population growth and has a greater effect in denser population (competition for limited resources)
logistic growth
when density dependent factors affect population size over time, so a plot of numbers versus time yields an S-shaped curve
density-independent limiting factors
factor that limits population growth and arises regardless of population size (a flood)
intraspecific competition
competition for a resource among member of the same species