a group of organisms of the same species populating a given area
# of individuals per unit area or volume
-(#tagged in 1st catch)(total 2nd catch) / (# recaptured tagged)
- A sampling technique used to estimate wildlife populations.
the study of the vital statistics of populations and how they change over time
age-specific summary of the survival pattern of a population
a group people having approximately the same age
Graph showing the number of survivors in different age groups for a particular species.
An age-specific summary of the reproductive rates in a population.
natural selection that favors average individuals in a population
A life history in which adults have but a single reproductive opportunity to produce large numbers of offspring, such as the life history of the Pacific salmon.
-Reproduction in which adults produce offspring over many years
-also known as repeated reproduction
zero population growth
when the birth rate equals the death rate
exponential population growth
Growth of a population in an ideal, unlimited environment, represented by a J-shaped curve when population size is plotted over time.
intrinsic rate of increase
max growth rate for the species
logistic population growth
A model describing population growth that levels off as population size approaches carrying capacity.
For smaller populations, the reproduction and survival of individuals decrease; arising from behavioral or ecological factors, such as difficulties in finding mates in animals.
-density dependent selection
-maximizes pop sizes near limit
-density independent selection
-maximizes pop sizes below limit
a birth rate or death rate that does NOT change with population density
relative # of individuals of each age
(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
The amount of biologically productive land and water needed to support a person or population.
change in a population from high birth and death rates to low birth and death rates or vice versa