Isle Royale
Extinction/Populations
Darwin & Friends
Finches & Friends
Extra Q's
100
What two species from Isle Royale did we talk about and what is their relationship to each other?
Wolf - Predator, Moose - Prey
100
What does extinction mean?
No living organisms of that species anywhere
100
Who was Charles Darwin?
He developed the theory of evolution through natural selection
100
What trait variation did we study in the finches?
Beak depth
100
What concept does Darwin's "tree of life" drawing represent
Species are descended from a common ancestor
200
Name two factors that negatively effect moose birth rate.
- increased predation
- decreased food availability
- harsh winters
- trouble finding a mate
200
Where is a local extinction more likely to occur and why?
On an island
200
Where did Darwin study the finches and tortoises?
The Galapagos Islands
200
What happened with the peppered moth as the industrial revolution polluted the area?
Industrial Revolution polluted the area and caused lichens to die, leaving tree bark dark.
200
Stabilizing Selection
300
What may be responsible for the large decrease in moose population?
Disease, harsh winter
(not wolves)
300
What would happen to the population if the death rate is higher than the birth rate?
The population decreases.
300
Where did Wallace study butterflies?
The Malay Archipelago/ Amazon
300
What type of selection was shown in our Galapagos finch beak depth data?
Directional Selection (Bigger beak favored)
300
Give an example of directional selection other than finch beak depth.
400
What is the population change?
Births = 650
Predation = 250
Disease = 150
+ 250
400
Give an example of something that may increase carrying capacity
ex. more food availability
400
How did the giraffe get its long neck... How would Lamarck and Darwin's explanations differ?
Lamarck would say individuals adapt (stretch yourself to get taller)
Darwin would say that the individuals with longer necks would have a higher chance of surviving and reproducing.
400
What variation of rock pocket mouse color will have more success surviving and reproducing?
Trick Question! Depends on the location
A - Light colored mouse
B - Dark colored mouse
400
Describe what is happening in the graph. What does the dotted line represent?
Carrying Capacity
(exponential growth, surpassing carrying capacity, decline and stabilization)
500
Define immigration and emigration
and what is the only way this could happen for isle royale populations?
immigration - arriving
emigration - leaving
500
Why might it be beneficial for a species to have variation within their population? Explain.
adapt to future environmental changes, avoid inbreeding, higher chance of survival
500
List 3 points of Darwin's theory of natural selection.
500
What does disruptive selection mean? What is an example?
Favoring the two extremes.
ex: Coho Salmon
500
If wolves were never reintroduced to Isle Royale, what would you expect to happen to the moose population?
increase until carrying capacity then decrease