Chapter 51 (exam 4) Flashcards
what two factors determine range
- abiotic factors
- biotic factors
population density
number of individuals per unit area
what are the different arrangement of patterns within populations
- random
- clumped
- uniform
random
position of each individual is independent of the others
clumped
organisms associate in social groups or quality of habitat is patchy
uniform
negative interactions occur among individuals (competition)
metapopulation
population made up of many small, physically isolated populations connect by dispersal
the number of individuals present in a population depends on what four processes
- birth
- death
- immigration
- emigration
what is the difference between immigration and emigration
immigration is when individuals enter a population from another population while emigration is when individuals leave a population to join another
what is a life table
summarizes probability that an individual will survive and reproduce in any given time interval over course of its lifetime
what are the types of survivorship curves
- type 1: survivorship high thru life and drops drastically in old age
- type 2: have same probability of dying in each year of life
- type 3: extremely high death rates
fecundity
number of female offspring produced by each female in the population
what does net reproductive rate indicate
whether the population is increasing or decreasing
how to find populations overall growth
change in population size (deltaN)/per unit time (deltat)
exponential growth
- no immigration or emigration is occurring
- per capita growth rate is constant and density independent
- accelerating increase in size of population