popular populations
the number of individuals of the same species per unit area
What is population density?
diagram that shows the distribution by ages of females and males within a certain population
What is Age Structure Diagram?
when individuals that make up a population are more or less evenly spaced out in a given area
a way to estimate the time it takes to double a number based on its growth rate
What is the Rule of 70?
an estimate of the average number of children that each woman in a population will bear throughout her childbearing years
what is Total Fertility Rate (TFR)?
a condition of demographic balance where the number of people in a specified population neither grows nor declines
What is Zero Population Growth?
a model based on the idea that birth and death rates correlate with stages of industrial development
What is Demographic Transition?
refer to how the individuals in a population เคจ are distributed in space at a given time
What is Species Dispersal Pattern?
the number of years it will take a population to double in size
What is Doubling Time?
the practice of controlling the number of children in a family and the intervals between their births, particularly by means of contraception or sterilization
What is family planning?
limit of how many individuals in a population the environment can sustain
What is carrying capacity?
the ability of a population of living species to increase under ideal environmental conditions
What is Biotic Potential?
when individuals that make up a population are dispersed with no predictable pattern
What is random distribution?
when a population's growth stays the same regardless of population, making a population grow faster and faster as it gets larger
What is Exponential Growth?
the average number of live births every woman in a population must have in order to maintain the current population number from one generation to the next
What is Replacement Level Fertility?
occurs when groups of animals living in the wild become separated from other groups of the same species, and are no longer connected in a way that allows for gene flow between groups
What is fragmentation?
organisms whose populations are governed by their biotic potential maximum reproductive capacity
What is r-selected species?
the maximum potential for growth of a population under ideal conditions
when a population's growth gets smaller and smaller as population size approaches the carrying capacity
What is Logistic Growth?
set of behavioral, morphological, and physiological adaptations that facilitate access to potential mates, improve the chances of mating and fertilization, and enhance infant survival
What is reproductive strategy?
a sudden, severe decline in a population or community of organisms as a result of natural causes
What is die off?
organisms that possess relatively stable populations and tend to produce relatively low numbers of offspring
What is k-selected species?
an organism that is not indigenous, or native, to a particular area
What is an invasive species?
the concept that a population continues to grow and does not slow in response to population reduction measures
the number of live births per 1000 of population per year