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Terms in this set (20)
What causes equilibrium in the Equilibrium Theory of Island biogeography
Equilibrium is the result of the balance of constant immigration and extinction
What are the parameters of the Theory of island biogeography?
P= Total number of species in source
Lambda (s)= immigration rate (# of immigrants/time)
U (s) = extinction rate
Change in species over time (dS/dt)= Lambda (s) - U (s)
Draw the immigration rate in MacArthur model. Describe the Letters.
Draw the extinction rate in MacArthur model
Draw the equilibrium rate in MacArthur model where I and E are equal among spp.
Explain what T^ and S^ mean
S^ equilibrium number of species
T^ turnover rate at equilibrium point
When is S^ at equilibrium? Two options
When S<S^ = lambda (s) > mu (s)
S>S^ = Mu (s) > lambda (s)
How can we increase or decrease the equilibrium number of species?
Increase with larger P and I
Decrease with larger E
What's T^? What does it mean? What does it depend on?
T^ is the equilibrium turn over rate
It means that the number of species arriving and leaving PER TIME are equal
It depends on I and E but NOT on P.
What does the area effect assume?
Does it affect both I and E?
1) Density of species are constant in all islands
2) Population size is proportional to island size
3) Larger islands will have large populations and will have a lower rate of extinction
- It only affects E, not I.
Draw a graph that shows the area effect
What's the distance effect?
Does it affect both I and E?
The distance effect is that if both island are same size, the one that is more near the mainland source will present a higher rate of immigration
It affects only I, not E.
Draw a graph that shows the distance effect
What's the main idea of the McArthur equilibrium island biography? and what are the 5 assumptions?
1) That equilibrium of number of species on an island is set by the island distance and size
2) it assumes that ALL SPECIES HAVE SIMILAR COLONIZATION AND EXTINCTION RATES. That population size is proportional to the area of the island. Immigration rate is inversely proportion to the island distance. Emigration rate is inversely proportional to the population size. A non interactive community.
What's a non interactive community?
It is when colonization and extinction rates are independent of the species composition.
Draw a graph where you show an equilibrium point in the equilibrium model concept of McArthur and Wilson, where I and E are not equal among spp.
Draw a graph where you show an equilibrium point in the equilibrium model concept of McArthur and Wilson, where I and E are not equal among spp. AND you are showing how immigration and extinction rates change as a function of distance and pop. size.
How's the rescue effect related to this concept?
That islands that are closer to the mainland source will have a lower rate of extinction than those that are farther.
Draw the original and most recent graph that explains rescue effect.
What's the target effect?
The target effect says that larger islands will be able to capture more species.
Draw a target effect graph
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