Ecology 4-6

logistic growth vs. exponential growth

logistic growth vs. exponential growth

L- limited growth, most organisms

E- unlimited growth, humans

define renewable resources

resources that is replenished faster than it is used

ex. wood, wind, solar, water

define non-renewable resources

limited resources, once there gone there gone

ex. coal, oil, gasoline

what is a trade off

negative effects because of something we used

what is a negative impact from nuclear power

radioactive substances are dangerous

what human activity has the most significant effect on earth’s atmosphere

burning of fossil fuels (combustion), increases CO2 in atmosphere

name three human activities and a geochemical cycle that they negatively impact

fertilizers- nitrogen- pollute watersheds

combustion- carbon- global warming

Paving and concrete- water- increases runoff

succession

where one community is replaced by another community over time until a stable community is reached

pioneer species

first organisms to grow in a new enviroment

climax community

mature and stable community of plants and animals

(end of succession)

How are primary and secondary succession alike

name two ways

one community will replace another until stability is reach

both start with pioneers

How are primary and secondary succession different

name two ways

primary starts at bare rock, secondary starts with soil

secondary happens after a disaster, primary is the formation of a brand new ecosystem

what is a parasite

an organism that lives off another organism

how is a parasite differ from a predator

a parasite doesnt want to kill its host

Mutualism

both organisms benefit from each other

++

ex. flowers and bees

commensalism

one organism benefits while the other is unaffected

+0

ex. trees and orchids

parasitism

one organism benefits while the other is harmed

+-

ex. Head lice and human

niche

all the things an organism needs and does within its habitat

(the role an organism plays in an ecosystem

habitat

actual area in the ecosystem where an organism lives

when do organism compete

when they have the same niche

interspecific competition

competition between different species

(international)

intraspecific competition

competition within the same species

(intramural)