EE31

Question 1

What are hyffakers mites?

Answer 1

orange eating mite (OEM)
Orang eating mite mite (OEMM)
OEM develop in large number of oranges
OEMM follow suit
destroy entire OEM infestation
then die itself en masse
colonisation and extinction play a large role
extinction occurs in individual patches - patches rescued by immigration
metapopulation persists even though no patch is table.

Question 2

what is a metapopulation?

Answer 2

spatially separated populations of the same species which interact at the same level.

Question 3

What is levins model?

Answer 3

habititat patches all equally connected to each other
p(t) = fraction of patches currently occupied at (t) time
extinction proportional to occupancy
colonisation proportional to p(1-p)
dp/dt = rate of change of patches occupied
c= colonisation rate
e = extinction rate.
dp/dt=c.p.(1-p)-e.p

Question 4

what happens in the levins model when there is no rate of change?

Answer 4

dp/dt=0 
0=c.p(1-p)-e.p
e.p=c.p(1-p)
e=c(1-p)
e/c=1-p
1-e/c=p
this is the equilibrium patch occupying rate

Question 5

At what point would the metapopulation go extinct?

Answer 5

if e>c and p

Question 6

What size patches are more likely to go extinct?

Answer 6

small patches

Question 7

which type of patches colonise less readily

Answer 7

remote

Question 8

what are the assumptions of the levins model?

Answer 8

1. infinite number of equally connected patches
2. all patches equivalent
3. colonisation no affected by distance
4. patches in binary state no considerations of local population abundance/dynamics

Question 9

What are the source sink dynamics of metapopulations

Answer 9

despite the fact that at sink or bad patch B

Question 10

give an example of a species which has metapopulations

Answer 10

glanulle frutality = butterfly

Question 11

what is the purist definition of a metapopulation?

Answer 11

• if flucutate in unison - consider a single spread out population
• reasonable chance of extinction and recolonisation for each habiutat patch
  cases where no poppulations go extinct often not considered a metapopulation