ecology Flashcards
ecology
study of how organisms with eachother and environment
species
same type of animals that have sex
population
same group of organisms
community
a lot of different organisms
ecosystem
all living things and there enviornment;abiotic+biotic
biosphere
sphere that hosts all life
biotic factor
something that is or used to be alive
abioticfactor
something that is never alive
habitat
specific environment in which an organism lives
resource
anything an organism needs
how do populations grow
birth+immigration-deaths+emigration
population size
describes the number of individual organisms present in a given population at a given time
population density
population of unit area
population distribution
random, uniform,clumped(most common)
age structure
number of organism of each age in a population
age structure diagram
growing;triangle
stable;vertical
declining;more old than young
sex ratio
distrubution of male and females
survivorships curves
3 basic types
immigration
is the arrival of individuals from outside a given area
emigration
departure of organisms from a given area
migration
seasonal movements
exponential growth
when a population increase by a fixed percentage each year
limiting factor
characteristics of the enivornment that limit population growth
logistic growth
populations initial exponential increase is slowed down and stopped by limiting factors
density dependent factor
stuff that is influenced by population density
density independent factor
limiting factors whose influence is not affected by population density
biotic potential
potential of reproduction
