EE37 Flashcards

1
Q

what does SAR stand for?

A

Species area relationships

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

olof arrhenius

A

species area relationship

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

equilibrium theory of island biogeography?

A

under this model larger and less isolated islands have more species. Near islands increase immigration and larger islands have greater immigration and less extinction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

looking at size (island biogeography graph), what will it look like?

A

2 extinction lines and 2 immigration lines

larger islands support larger populations so have lower extinction rates.also larger targets so will have higher immigration rates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

looking at distance in island bio geography,what will the graph of 2 islands look like?

A

the extinction rate will be the same (same size islands) but the immigration rate of the nearer island will be greater. 2 immigration lines 1 extinction line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

is the equilibrium theory of island biogeography neutral?

A

yes. species’ fates are independent of their traits or niches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what 2 things explain species numbers best together?

A

area and isolation expain species numbers better than either does alone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the opposing theory to equilibrium theory of island biogeography?

A

Niche theory of biodiversity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Niche theory problems?

A

maybe larger areas have more sorts of habitat/ niche
possibly S=KH and H scales with area

problem:habitat is hard to measure. multiple regression does not work efficiently when explanatory variables are strongly correlated

we cannot easily separate the effects of area and habitat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

who first developed the neutral theory of biodiversity?

A

Stephen hubbell whilst trying to explain diversity in forest plots on Baro Colarado island in Panama

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what was the past niche theory of biodiversity?

A

ecological differences between species enable them to co-exist(ghost of competition past)
-environmental heterogenity/relief/soil type/rainfall etc

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

neutral theory of biodiversity

A

random mortality opens a gap for colonisation . biodiversity is thus down to chance

species abundance fluctuates by drift –> dwindling to zero by chance and immigration can bring a new species

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

SADs

A

species abundance distributions

like SARs, SADs can arise even with neitral theory of biodiversity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is one of the most widespread patterns i biodiversity?

A

SARs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How can SAR be explained?

A

1) niche based processes
2) neutral processes

it is often not clear whether habitat diversity or area determines species richness.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

why may equilibrium models be useful?

A

if equilibrium models are correct,the SAR makes predictions about conservation and macro evolution
can be used to predict species extinction and diversification rate.