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CH 4 Vocab

Scientific Method

TermDefinition
ecology the study of how organisms interact with one another and with their environments,100
species a group of individuals that interbreed and produce fertile offspring.101
population the members of a species that live in the same area,101
community all of the population in a particular area ,101
ecosystem all living things and their physical environments within a particular area,101
biosphere the Earth and all of its organisms and enviornments, 74,102
biotic factor any part of an ecosystem that is living or used to be living,102
abiotic factor any part of an ecosystem that has never been living,103
habitat the specific environment in which an organism lives,103
resource anything an organism needs; includes nutrition shelter, mates and breeding sites, 103
population size the number of individual organisms present in a population at a given time,104
population density the number of individuals in a population per unit of area, 106
population distribution how organisms are arranged within an area;sometimes called population dispersion,107
age structure diagram a chart that shows the age distribution of a population; also called ega pyramid,108
sex ratio the proportion of males to females in a population,109
survivorship curve a graph showing the likelihood of survival within a group or population by age , 111
immigration the movement of individuals to a given area,112
emigration the movement of individuals away from a given area,112
migration the seasonal movement of organisms into and out of an area,112
exponential growth the pattern of population growth in which a population increases by a fixed percentage each year,114
limiting factor a characteristic of the environment that restricts population growth,115
carrying capacity the largest population a given environment can support,115
logistic growth the pattern of population growth in which exponential growth is slowed and finally stopped by limiting factirs,115
density-dependent factor a limiting factor whose influence changes with population density; includes competition, predation, and disease, 116
density-independent factor a limiting factor whose influence is not affected by population density; includes catastrophic events,116
biotic potental the growth rate of a population under ideal conditions,117
Created by: sarah1233335
 

 



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