changing populations question: why do populations change? visual aid for kamico activity “changing...
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Changing Populations
Question: Why do populations change?
Visual Aid for Kamico Activity “Changing Populations”
Answer: To SURVIVE!!
SUCCESSFUL ADAPTATIONS
GALAPAGOS ISLAND FINCHES
Charles Darwin discovered finches while visiting the Galapagos Islands
There were 14 types on the island
They have adapted their beaks to suit their habitat.
Why? Survival
Eastern Spade foot Toad
Lives in Blackland Prairies of North America (A very dry place)
In a drought, it digs into the ground and covers himself with soil
While in the soil, his skin will absorb water .
He needs the water to reproduce and SURVIVELook at h
is
spade-sh
aped
feet!
Green Anoles Live in Florida Changed skin
color from green to brown to blend in with tree trunks
Cuban anole forced them to migrate to tops of trees
Adapted by changing to a different habitat for SURVIVAL
Can you see me?
LESS SUCCESSFUL
ADAPTATIONS
American Buffalo Millions of buffalo
roamed prairies from Texas to North Dakota
Pioneers moved into their habitat
They were not able to adapt
Are critically endangered due to intro of humans as predators and reduction of habitat
American Bald Eagles Pesticide use by
humans has decreased their numbers
They ate prey which had consumed plants/insects coated with pesticides.
They are at the top of their food chain, so pesticides would accumulate in their bodies
It would then pass to their eggs
Passenger Pigeon There used to be so
many they would turn the sky dark when they flew by
Lived in N. America Hardwood forests were
cleared for agriculture Lost their habitat Did not survive the
change and thus are extinct
Questions Follow up with the (10) “Changing
Populations Activity” questions from Kamico p388-389
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