21 terms

ECOLOGY: Population & Communities AND Studying Populations

STUDY
PLAY
organism
any living thing
habitat
An environment that provides the things a specific organism needs to live, grow, and reproduce
biotic factor
The living parts of a habitat
abiotic factor
The nonliving parts of a habitat
photosynthesis
Plants use the sun's energy to convert water and carbon dioxide into sugars
species
A group of similar organisms that can mate with each other and produce fertile offspring.
population
A group of individuals belonging to one species and living in the same geographic area.
community
A group of different species that live together in one area
ecosystems
combinations of living and non-living organisms and their surroundings
ecology
Scientific study of interactions among organisms and between organisms and their environment
birth rate
the number of births in a population in a certain amount of time
estimate
an approximation of a number, based on reasonable assumptions
death rate
The number of deaths in a population in a certain amount of time
immigration
moving into a population
emigration
moving out of a population
direct observation
counting one by one
indirect observation
counting samples of organisms
sampling
reasonable assumptions that organisms are among the population in an area (ie. the # of nests that can be counted for a certain type of bird)
population density
Number of individuals per unit area
limiting factor
An environmental factor that causes a population to decrease
carrying capacity
The largest population that an area can support