Additional Laboratory Notes for BIO 2020

© 20 April 2004, Mary Jean Holland


FOOD WEBS

Exercise #1: Food Web for Tall-Grass Prairie Ecosystem

Using a separate piece of paper (provided by instructor) construct a Food Web for the Ecosystem described below. Remember that the arrows indicate the direction of energy flow, from the eaten to the eater.

Producers: Blue Stem Grass, Prairie Cornflower

Decomposers: Bacteria and Fungi

Consumers What they eat
Antelope Blue Stem Grass, Prairie Cornflower
Prairie Dog Blue Stem Grass
Grasshopper Prairie Cornflower
Sparrow
Prairie Cornflower, Grasshopper
Coyote Prairie Dog, Antelope
Eagle
Prairie Dog, Antelope, Coyote, Sparrow

Which species are herbivores?




Which species are carnivores?




Which species are omnivores?




Which species is the top carnivore (at highest trophic level) for this ecosystem?




Exercise #2: Food Web for Temperate Deciduous Forest Ecosystem

Using the paper provided, construct a Food Web for the Ecosystem described below. Remember that the arrows indicate the direction of energy flow, from the eaten to the eater.

Producers: White Oak, Shagbark Hickory, Mountain Winterberry

Decomposers: Bacteria and Fungi

Consumers What they eat
Gray Squirrel White Oak
White-Tailed Deer White Oak, Shagbark Hickory
May Beetle Mountain Winterberry
Wood-Boring Beetle White Oak
White-Footed Mouse Mountain Winterberry, Wood-Boring Beetle (Adults)
Wood Frog May Beetle
Long-Tailed Weasel Gray Squirrel, White-Footed Mouse
Hairy Woodpecker Wood-Boring Beetle (Larvae)
Racer Snake Wood Frog, White-Footed Mouse
Broad-Winged Hawk Racer Snake, White-Footed Mouse, Hairy Woodpecker, Gray Squirrel, Long-Tailed Weasel

In the Table above, mark each species of consumer with
H (herbivore), O (omnivore), or C (carnivore).

Which species is the top carnivore (at highest trophic level) for this ecosystem?




Which species have no apparent predators in this ecosystem?




For species without predators, what keeps their population from becoming too large?





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Last updated 20 April 2004 (MJCH/JHW)