Trophic Level Food Web Case Study
Transcript of Trophic Level Food Web Case Study
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Trophic Level Food Web Case Study
Grade: «grade» Subject: «subject»
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1 Riparian habitats are:
A High altitude mountain habitats .
B Terrestrial habitats adjacent to rivers and streams .
C Lake habitats .
D A forest-type habitat found in western North America .
E A type of grassland habitat .
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2 What do you think Paul will find are the aspects of the ecosystem that most strongly affect the diversity of bird species found there?
A Available food for the birds .
B Number of predators of birds .
C Number of trees that provide nest sites for the birds .
D Something else .
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3 At what trophic level are songbirds?
A Primary Consumer
B Secondary Consumer
C Primary Producer
D Secondary Producer
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4 What other organisms share a trophic level with songbirds?
A Coyotes
B Rabbits
C Aspen
D Mule Deer
E Beaver
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5 The one kind of feeding relationship NOT illustrated in the food web is . . .
A Carnivory
B Herbivory
C Omnivory
D Cannibalism
E All the above relationships are illustrated
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6 What does this FUNCTIONAL food web suggest about other organisms that may influence SONGBIRD population growth?
ANumbers of insects will substantially affect songbird populations .
BNumbers of willows and aspens will substantially affect songbird populations .
CNumbers of moose and elk will substantially affect songbird populations .
DMore than one trophic level will affect songbird populations .
E More than one of the above answers is correct .
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7 Look at your food web diagram . If bottom-up control explains the size of songbird populations in Paul's riparian habitats, which graph best illustrates the critical population interactions?
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8 Look at your food web diagram . If top- down factors control songbird populations, increasing which population do you predict would result in reduced songbird populations?
A High hawk populations
B Low hawk populations
C High moose populations
D High coyote populations
E Low coyote populations
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9 The summary data didn't reflect differences Paul thought existed between his sites, so he looked more closely at his first year data . What conclusions about trophic effects can you draw from these data?
A Hawks have a top-down effect on songbirds .
B Willows have a bottom- up effect on songbirds .
C Insects have a bottom-up effect on songbirds .
D Moose have a top-down effect on willows .
E More than one of the above statements is a valid conclusion.
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10 If moose affect willows, what impact on songbirds might be expected if moose populations increase? Look at your food web diagram .
A No change in songbird populationsB Increase in songbird populations
C Decrease in songbird populations
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11 Paul thinks the moose-willow feeding interaction may affect the songbird populations . What non-feeding relationship in this community likely provides a mechanism by which moose affect songbird populations?
A Willows provide habitat and food for insects .
B Willows provide nest sites for birds .
C Moose waste adds nutrients to soil for the willows .
D Grasses provide material for bird and rabbit nests .
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12 Shortly after Paul's first year of research, the first wolves were reintroduced to Yellowstone NP . How do you predict wolf reintroduction will affect songbird abundances?
A No change in songbird populationsB Increase in songbird populations
C Decrease in songbird populations
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