pop ecol bits

Iteroparity

Reproduction in which adults produce offspring over many years; also known as repeated reproduction. (continuous)

Semelparity

when organisms reproduce only once during their life (discrete)

Life table

an age-specific summary of the survival pattern of a population

static life table

a life table that quantifies the survival and fecundity of all individuals in a population during a single time interval

cohort life table

a life table that follows a group of individuals born at the same time from birth to the death of the last individual

Survivorship

the percentage of members of a group that are likely to survive to any given age

Mortality rate

the number of deaths per thousand

Density dependence

regulation of population growth by mechanisms controlled by the size of the population; effect increases as population size increases

Logistic growth

Population growth that is controlled by limited resources (carrying capacity)

Population regulation

A pattern of population growth in which one or more density-dependent factors increase population size when numbers are low and decrease population size when numbers are high.

Functional response

the intake rate of a consumer as a function of food density (the amount of food available in a given ecotope)

Numerical response

the reproduction rate of a consumer as a function of food density

Population equilibrium

a dynamic balance between births and deaths

Maximum sustainable yield

the maximum rate at which a renewable resource can be exploited without impairing its ability to be renewed or replenished

key factor

The mortality source that has the largest effect on population change

what are k values

a measure of the intensity of mortality between two age classes or life stages

what is key factor analysis

tool for IDing

- The age/stage that contributes most to defining population size;

-Where in the life cycle density dependence acts most strongly on mortality.

Intrinsic (exponential) rate of natural increase, r

The per capita rate of population growth: the numbers of offspring produced by each individual on average in a given time-period, measured in the absence of extrinsic factors such as competition, predation, disease.