Chapter 4 Vocabulary

the study of how organisms interact with each other and with their environment.
a group of individuals that interbreed and produce fertile offsprings
Members of a species that live in the same area at the same time make up

All of the populations in a particular are make up.


Includes all
The regions of the surface and atmosphere of the earth or other planet occupied by living organisms.
Biotic Factor
 components are the living things that shape an ecosystem. They are, any living component that affects another organism
Abiotic Factor
components are non-living chemical and physical factors in the environment

  • A particular type of environment regarded as a home for organisms.

are limited, different species have evolved to “share” the specific resource
Population size
In population genetics and population ecology, population size (usually denoted N) is the number of individual organisms in a population..
Population density
 is a measurement of population per unit area or unit volume.
Population distrubtion
the range or distribution of a species is the geographical area within which that species can be found
Age structure
features partners of different ages, usually one adolescent and the other adult
Age Structure Diagram
A population pyramid, also called age-sex pyramid and age structure diagram, is a graphical illustration that shows the distribution
Sex Ratio
 is the ratio of males to females in a population. The primary sex ratio is the ratio at the time of conception, secondary sex.
Survivorship curve
 a graph showing the number or proportion of individuals surviving at each age for a given species or group
The action of coming to live permanently in a foreign country
migration from a place (especially migration from your native country in order to settle in another).
the movement of persons from one country or locality to another.
Exponential growth
Growth whose rate becomes ever more rapid in proportion to the growing total number or size.
Limiting Factor
 limiting resource is a factor that controls a process, such as organism growth or species population, size
Carrying Capacity

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The number of people, other living organisms, or crops that a region can support without environmental degradation.

Logistic Growth
 logistic curve is a common sigmoid curve, given its name in 1844 or 1845 by Pierre François Verhuls
Density-Dependent Factor
A factor that causes a level of mortality that varies with the number of individuals in the population
Density-Independent Factor
A factor that causes a level of mortality that is unrelated to population density..
Biotic Potential
is the maximum reproductive capacity of a population if resources are unlimited