Download Ecosystems Response Notes

Population
Interactions
Draw this diagram
What forms an organism?
*An organism is any living thing from
bacteria to plants and animals.*
An organism must be
made of at least one
cell.
What forms an ecosystem?
--*Any living and nonliving things that
interact together form an ecosystem. *
Ecosystems as small as a
drop of pond water to
as big as the entire
Earth.
*Living = biotic
Nonliving = abiotic*
What forms a population?
*Populations form when individuals
of the same species share a habitat at
the same time.*
Habitat is where a
population lives.
A habitat must support
life with food, water,
and other resources.
Carrying Capacity
the maximum population size of the species that the environment can
sustain.
_____ _____are resources that
limit the size of populations of
organisms in an ecosystem.
-Limiting Factors
-examples:
-climate
-water
-habitat
-predation
-pollution
What forms a community?
--*Communities form when
populations interact with one
another.*
Communities can have
several different
habitats, places where
organisms live.
*Predation occurs when one organism
eats all or part of another organism.*
The “kill” is usually quick.
*Predation requires predator and prey.*
• Predator lives. (+)
• Prey dies or is partially torn apart. (-)
• Biologists use + / - symbols to make it easier to remember predatorprey relationships. + because it gains, and – because it is harmed.
• *Food chains and food webs represent predator-prey relationships.*
Practice Question
Example: PJHS Ecosystem
MHS
9th grade
10th grade
administration
administration
students
Students
Ecosystem? Community? Population? Organism?