lecture 5 Flashcards
how to model pop in open system
current pop = (birth + immigration) - (death and emigration)
how to model pop in closed system
birth + death
what growth is in closed pop
exponential growth
what is exponential growth
density independent
what is r
intrinsic growth rate, birth/pop size - death/pop size
how to calculate exponential growth rate per capita right now
(change in pop size/change in time)/ pop size now
how to calculate future exponential pop size
n(f)=n(c)e^rt
what is geometric growth
periods of reproduction and deaths
what is logistic growth
when there are negative interactions around, density dependent, K = carrying capacity
B decreases and D increases as pop increases, where they meet is K
how to calculate the growth rate of logistic growth
rN(1-(N-K)) = rN((K-N)/K)
why do cycles in herring rabbits occur
density dependent factors
what is pop demography
factors determine size and structure
what is age structure
the individuals alive at each age, how much r contributes
what is a demographic graph
how many are alive at each age
what are the survivor ship curves
type I - lives until old, little offspring, expensive investment
type II - linear decrease, small animals
type III - few live until old, produce many offspring and hope that there are some that will stay alive
