lecture 12 Flashcards
what is population?
a group of potentially interbreeding individuals of a single species inhabiting a specific area
what is population ecology?
a study of the spatial and temporal patterns in the abundance and distribution of organisms and the mechanisms that produce those patterns
why study populations?
- conservation
- pest managment
- harvest managment
- invasive species
what do closed populations include?
- births
- deaths
- single populations (spatially isolated)
what do open populations include?
- emmigration
- immigration
- birth
- death
- metapopulations (network of populations)
what are total rates?
describes the rate for the total population
what is total rates denoted by?
capital letters
what units are used by total rates?
births/time
what is discrete growth?
when an organism doesn’t have births and deaths occur continuously, leading to a population that grows in pulses
how are discrete populations modeled?
as geometric population growth
what does lambda represent?
the finite or geometric rate of increase
what does lambda measure?
the proportional change in population size from one time period to the next
what happens when lambda is bigger than 1?
population will increase
what happens when lambda is less than 1?
population will decrease
what happens when lambda is equal to 1?
the population will stay the same
what are the assumptions of geometric and exponential growth?
- no I or E
- constant b and d
- all individuals are the same
- no age or size or sex structure
- continuous continuous growth with no time logs for exponential and discrete generations for geometric growth
