EE28

Question 1

What is the ghost of competition past?

Answer 1

species dont compete now becasue evolution has shaped resource exploitation in response to past competition

Question 2

Who is the winner of resource competition?

Answer 2

species that reduces the resource to below minimum level needed to support its rival

Question 3

What is competative release?

Answer 3

a method to test whether species compete

remove one and see if other expands niche/range.

Question 4

At what point does the coexistance of two species occur?

- or the exclusion of one.

Answer 4

coexistance occurs when intraspecific >interspecific

exclusion occurs when intraspecific

Question 5

What is this an example of intraspecific>interspecific

Answer 5

the fundemental niche

predicts coexistance

Question 6

What is this an example of intraspecific

Answer 6

identical niche

predicts exclusion

Question 7

How do you add interspecific competion to logistic model assuming two species X and Y

Answer 7

dX/dt = r(1-X/K)X
dY/dt = r(1-Y/k)Y
dX/dt = r(1-X+aY/K)X      dY/dt = r(1-Y+bX/k)Y
a=competative effect of Y on X
b= competative effect of X on Y
a>1 Y hurts X more than X hurts X
b>1 X hurts Y more than Y hurts Y
* a and b control relative strengths of interspecific and intraspecifc competition

Question 8

What does aggregation promote?

Answer 8

coexistance

• spread out, not much intraspecifc competition
• lots of interspecifc competion

Question 9

What is europhication?

Answer 9

environment enriched with nutrients

- can be a poblem in marine = algal bloom