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
