Lecture 8 - Trophic cascades and review

Question 1

How can plant population be increased via predation?

E.g. Trophic cascade

Answer 1

Predation on herbivores reduces herbivores that eat plants

Question 2

Why do sea otters cause kelp forests to be more abundant?

Answer 2

As they eat urchins

Question 3

Why did sea otter pop drop?

Answer 3

Overfishing caused whales to change their diets to otters

Question 4

What can spooky yet harmless predators replicate?

Answer 4

Spooky yet harmful predators

Question 5

Name 3 things spiders do to grasshoppys?

Answer 5

Alter nymph time and activity budget

Alter adult activity time -18%

Increase juvenile mortality 20%

Question 6

What is a sit and wait predator?

Answer 6

Just sits, waits for something to come then BOOM

Question 7

What is an active predator

Answer 7

Predator that actively checks out area for prey

Question 8

Active hunting predator:

Answer 8

Reduces plant diversity.
Increases ANNP
Decompo [kinda average]
N mineralisation

Relative to sit and wait