Lecture 10-Dispersal

Question 1

Which part of the Nt equation is dispersal about?

Answer 1

• I and E

- immigration and emigration

Question 2

When will be dispersal important?

Answer 2

• always
• especially need to account for it
• -when species are invading a new area
• -when a population is threatened
• -when on the edge of a population

Question 3

How do we measure I an E?

Answer 3

• pitfall traps
• sticky traps
• suction traps
• collect marked individuals
• electronic tagging

Question 4

What are the methods of dispersal for animals?

Answer 4

• active: fly, walk, swing

- passive: currents, floods, stick to other animals etc.

Question 5

What are the methods for dispersal for plants?

Answer 5

-gravity, explosive wind, water, animals(via gut, stuck to outside, or deliberately moved machinery (inside or outside))

Question 6

What is a dispersal syndrome?

Answer 6

-set of traits (of the animal/plant) indicating what vector we think it evolved to be dispersed by

Question 7

What are dispersal vectors/agents?

Answer 7

-the thing (organism/physical) force that causes dispersal

Question 8

What does stratified dispersal mean?

Answer 8

-discontinuous long-distance dispersal usually occurs in combination with short-distance continuous dispersal
and combination of these long- and short-distance dispersal mechanisms is stratified dispersal
e.g. fruit on the ground eaten by an animal and dispersed via feces a distance away
-wind blows seeds into water and go down river