Do Now

Biotic Factors: Abiotic Factors1. _______________________ 1. ____________________2. _______________________ 2. ____________________3. _______________________ 4. _______________________

SquirrelOwlFoxBluejay

DirtSunlight

Hook:

What organisms do you see in this picture?

Populations, Communities and Ecosystems

All living things are types of __________. A group of the same type of organisms is called a ___________. A bunch of different populations together is called a ____________. And a community with all the abiotic factors is called an ___________.

organisms

populationcommunity

ecosystem

Populations, Communities and Ecosystems

ExampleOrganism – _________________________________

Population – ________________________________

Community –________________________________

Ecosystem –_________________________________

A lone wolf

A pack of wolves

A wolf pack & squirrels & rabbits

The entire forest (biotic and abiotic)

Populations, Communities and Ecosystems

When the population of a _________ becomes too large it starts what is called a ___________________. For example, if there are too many wolves in the forest they will eat all of their _____ (rabbits). When there are too few rabbits the wolves will start to starve and die, and the wolf population will begin to _________.

predator

boom and bust cycle

prey

decrease

Practice!1. ____ All the living and non living things in an area2. ____ All the ants in an anthill3. ____ An area that provides food and shelter4. ____ Fish, frogs, turtles, lily pads and dragonflies are all members of the same what?5. ____ All the blackbirds in your neighborhood6. ____ A forest7. ____ The damp soil within a forest in which a mushroom grows8. ____ Different populations that live together in a particular area9. ____ A prairie dog, a hawk, and a badger all members of the same what?

10. ____ The rainbow trout in a stream

EPHC

PEH

C

C

P

Hare and Lynx Populations

How do to the populations of snowshoe hares and lynx affect each other?

Hare and Lynx Populations

How do to the populations of snowshoe hares and lynx affect each other?

1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 19190

10

20

30

40

50

60

70

80

90

Lynx & Hare Populations

HaresLynx

Year

Popu

lati

on (

in t

hous

ands

)