EE40

Question 1

what was the old view about number of species through time?

Answer 1

that it increased

Question 2

what period of time are we currently in?

Answer 2

sixth mass extinction

Question 3

when were the last 5 mass extinctions and how many familes went extinct.

Answer 3

end of ordovician 26
late devonian 22
end permian 51
end triassic 22
end cretaceous 16

Question 4

What does logistic growth suggest dominates diversity?

Answer 4

biotic factors

Question 5

what does exponential growth suggest dominates diversity?

Answer 5

abiotic factors

Question 6

what are current extinction rates?

Answer 6

1 or 2 orders of magnitude above background rates
will go higher if all currently threatened species go extinct
magnitude not yet as high as past mass extinctions - could get there

Question 7

what is the red queen hypothesis?

Answer 7

competition suppresses speciation or increases extinction

logistic pattern of diversification

Question 8

what is the court jester hypothesis?

Answer 8

environmental pertubations rest diversity

exponential pattern and mass extinction

Question 9

Is carrying capacity a constant?

Answer 9

no

Question 10

what does the fossil record give?

Answer 10

a biased picture of past diversity
analysis that try and correct for bias suggest a logisitc
analysis of best bits of fossil record also suggest this.