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Flashcards in Week 6 Deck (38)
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1

What is a food chain

A model that shows the flow of energy in an ecosystem

2

What is the source of energy to producers?

The sun

3

What are levels on the food chain called

Tropic

4

What would happen if the producers population size is reduced?

The populations of the consumers would fall

5

What would happen to the population size if the primary consumer is reduced?

The population of the producers would do well and the secondary consumers will starve and compete more

6

What happens if the secondary consumer is reduced

If the secondary consumer is reduced the primary consumers will do well and maybe over populate and overeat producers and starve too

7

If the tertiary consumers were reduced

The secondary consumers would eat more of the primary consumers

8

How much of the energy pyramid do producers get

100%

9

What percent do primary consumers get?

10%

10

How much percent do secondary consumers get?

1%

11

How much do tertiary consumers get

0.1%

12

What percent of energy is transferred to the next tropic level?

10%

13

What is the other 90% of the energy used for in organisms

The energy is used for living, growing and reproducing

14

Why are food charts important

They show how organisms depend on each other for energy

15

What does S stand for?

Richness

16

What does richness measure

Total number of species in an ecosystem

17

What doesn't richness take into account

Number of individuals proportion or distribution of each species within the ecosystem

18

What does H stand for?

Shannon diversity index

19

What is the Shannon diversity index and what does it account for?

It accounts for species abundance by calculating proportion of individuals compared to total number of individuals in the community

20

What is the formula for H or the diversity index

H= -SUM (Pi * ln (Pi))

21

What does Pi in the diversity index stand for?

Species abundance/total abundance in the community

22

What does Ln stand for?

Natural log

23

What does E stand for m

Measure my to compare abundances of each species in the community

24

What does a low value of evenness mean?

One or a few species dominate

25

What does a high value of evenness mean?

All species in community have similar abundances

26

What does evenness values range from?

0 to 1

27

What does a 0 evenness signify?

Low evenness

28

What does a 1 signify in evenness?

It signifies complete evenness

29

Why is the formula for evenness?

E=H/Hmax

30

What does H stand for in the evenness formula?

Diversity index