Lecture 33: Tempo & Mode

Question 1

Define tempo

Answer 1

rate and any modulation thereof

morphological rates of evolution
- change in character/unit

Question 2

Define mode

Answer 2

particular manner or form

Question 3

Passive vs. Driven trends of evolution

Answer 3

Passive Process - tends to have an increase in mean but the smallest starting point will not be passes

Driven - increase in mean and smallest passes

Question 4

Understand the affect environment can have an tempo

Answer 4

• corn

- those fish whose habitat wasn’t changed

Question 5

What are taxonomic rates of evolution?

Answer 5

• Number of taxa originating per unit time

- Average number of years a taxon stays extant

Question 6

What is Simpson’s taxonomic survivorship data?

Answer 6

• records first and last appearance

- can be used to plot survivorship curves

Question 7

What are the different modes of evolution?

Answer 7

• Phyletic gradualism
• Punctuated equilibrium
• “rectangular” evolution

Question 8

What is phyletic gradualism?

Answer 8

• slow, gradual change in phenotype

- speciation by gradual change

Question 9

What is punctuated equilibrium?

Answer 9

• periods of little or no change are, “punctuated” by rapid morphological change
• most morphological change is at speciation

(the bulk of the evolution happens at the speciation event)

Question 10

There are lineage-specific rate of…?

Answer 10

• Speciation

- Extinction

Question 11

Species with _____ ranges persist longer and have lower extinction rates

Answer 11

wider

• extinction negatively correlated with number of times found in fossil records