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Flashcards in Week 6 Deck (38)
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1
Q

What is a food chain

A

A model that shows the flow of energy in an ecosystem

2
Q

What is the source of energy to producers?

A

The sun

3
Q

What are levels on the food chain called

A

Tropic

4
Q

What would happen if the producers population size is reduced?

A

The populations of the consumers would fall

5
Q

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

A

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

6
Q

What happens if the secondary consumer is reduced

A

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

7
Q

If the tertiary consumers were reduced

A

The secondary consumers would eat more of the primary consumers

8
Q

How much of the energy pyramid do producers get

A

100%

9
Q

What percent do primary consumers get?

A

10%

10
Q

How much percent do secondary consumers get?

A

1%

11
Q

How much do tertiary consumers get

A

0.1%

12
Q

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

A

10%

13
Q

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

A

The energy is used for living, growing and reproducing

14
Q

Why are food charts important

A

They show how organisms depend on each other for energy

15
Q

What does S stand for?

A

Richness

16
Q

What does richness measure

A

Total number of species in an ecosystem

17
Q

What doesn’t richness take into account

A

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

18
Q

What does H stand for?

A

Shannon diversity index

19
Q

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

A

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

20
Q

What is the formula for H or the diversity index

A

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

21
Q

What does Pi in the diversity index stand for?

A

Species abundance/total abundance in the community

22
Q

What does Ln stand for?

A

Natural log

23
Q

What does E stand for m

A

Measure my to compare abundances of each species in the community

24
Q

What does a low value of evenness mean?

A

One or a few species dominate

25
Q

What does a high value of evenness mean?

A

All species in community have similar abundances

26
Q

What does evenness values range from?

A

0 to 1

27
Q

What does a 0 evenness signify?

A

Low evenness

28
Q

What does a 1 signify in evenness?

A

It signifies complete evenness

29
Q

Why is the formula for evenness?

A

E=H/Hmax

30
Q

What does H stand for in the evenness formula?

A

Diversity index

31
Q

What does Hmax stand for in the evenness formula?

A

Highest possible diversity value for community t

32
Q

What should you record in your journal

A

Recent weather, habitat description, length of time in field

33
Q

What is a effective non destructive way of sampling organisms

A

Using photos

34
Q

What is important about taking photos in the field

A

Not disturbing wildlife or putting yourself in dangerous situations

35
Q

What should you do to make sure you can determine the size of the object in the photo

A

Use and object for scale like a ruler

36
Q

How do you make photos correspond with notes

A

Include photo reference number

37
Q

How fast you measure abiotic factors

A

You make a climate graph

38
Q

What is sampling

A

The process of selescting part of something with intent of representing whole.