3. Demography Flashcards
What happens when population controls are balanced
Static state
What questions do we ask about mortality?
Is mortality high among juveniles,
Do older organisms have a higher mortality
How can the mortality schedule be shown?
Life table
What is a cohort life table?
an age specific summary of the mortality ranges, used for short lived organisms
What is a static life table?
An age specific summary of mortality rates, estimated from a cross section, snap shot of population
How do we get per capita death rate?
No of deaths divided by population risk
What is a survivorship curve?
Graph that can show data from life tables
What is type 1 survivorship curve?
Low per capita mortality, except in old age
What is type 2 survivorship curve?
Constant per capita mortality, independent of age, e.g birds
What is type 3 survivorship curve?
High per capita mortality early in life, parasites and fish
what does r mean
Intrinsic valur fr
for increase in number
what is an example of a species that produces parthenogenetically
aphids
what are the two mian scales of growth in graphs?
Logarithmic and arithmrtif
How does the little r varies?
each species will gace idfferent litttle are with a different benefit
what control the growth of the population
Multiplication rate
Do populations keep the same multipication rate?
No varies and alters over time
What controls population rate?
population size
What number would a population need to sustain itself?
1.0
Who developed the preceding mathematical theory of population growth
Robert May
Why do populations even out?
Resource limitations
What is the upper or maximum value of resources
Carrying Capacity
What did reindeers do on st paul island?
Overshot resource capacity
