ecology Flashcards
biotic factors
biological factors caused by the prescence of other organisms
-predation of animals (reduce)
-competition for limited resources
-new pathogen
-new predator
why not many independent variables
-fair
valid compairson
other factors
quadrat
antibiotic factors
physical factors that affect the distribution size of an organism:
-temp
-light intensity
-humidity/moisture level
-co2
-02
food web
trophic level
pyramid of numbers
show interdependence how change in one population can affect others
level/position of each organism in food chain
show population of each organism at each trophic level in food chain. usually smaller as go up as most lose energy but oe large oak tree feed many small
habitat def
decomposers
-within an ecosystem where individual species live ie in lake bottom o swamp
-organisms that feed by saprotrophic nutrition on dead animals or non living organic matter for energy
ecology
ecosystem
community
-interaction of all the organisms living within an area and environment around them ie deserts, coral reef, lake.
community-all organisms and populations of diff species living within an ecosystem
way to measure quad
ACFOR
pyramid of biomass
pyramid of energy
amount of living material of organisms
calculate:average dry mis of one individual Tims total number of individuals
problem: can be inverted due to undersamplngsuch assort life span of algae in food web or standing crop of tree
pyramids of energy: amount of chemical energy in organisms in each trophic level available to those who feed
how is energy lost
only 10 percent passed on. number increase less energy available as up due to aspiration, egested/excretion, life process movement, bones
population
habitat
a group of individuals of one species living in a habitat
area in ecosystem where a population of animals live
