FoodWebs.pdf - Maddie Douglas Paul Robertson ENV101 Lab 4 Food Webs Purpose/Question The purpose of Lab 4 is to gain a better understanding of food webs

FoodWebs.pdf - Maddie Douglas Paul Robertson ENV101 Lab 4...

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Maddie Douglas Paul Robertson ENV101 Lab 4: Food Webs
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Purpose/Question The purpose of Lab 4 is to gain a better understanding of food webs, ecology and ecosystem structure. Hypothesis If the owl pellet is composed of rodent bones, then my owl hunted at either dawn, dusk, or night.
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Data Table 1
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Number of bones Identified-
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Skull 2 rodent skulls Lower Jaw 10 jaw bones, 7 rodent & 3 shrew Scapulae 7 scapulae, 3 shrew & 4 rodent forelimbs 31 forelimbs (shrew and rodent) Hind limbs 14 hindlimbs (shrew and rodent) pelvises 7 pelvises (shrew and rodent) ribs 48 ribs Data Table 2
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1. a) 3 or fewer teeth on each side of upper jaw. Go to 2 b) 9 or more teeth on each side of upper jaw. Go to 3 2. a) 2 incisors on upper jaw. Go to 4 b) 4 incisors on upper jaw. One pair is directly behind the other. Rabbit 3. a) Skull length of 23 mm or less and brown teeth. Shrew b) Skull length of more than 23 mm and 44 teeth in the upper and lower jaw. Mole 4. a) Roof of mouth extending past the last molar Go to 5 b) Roof of mouth not extending past last molar. Go to 6 5. a) Skull length of 22 mm or less. Mouse b) Skull length of more than 22 mm. Rat
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6. a) Molars flat. Meadow vole b) Molars rounded. Deer mouse
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Analysis Questions- 1. Consider the number of bones in your owl pellet. How many prey items are you able to account for? (Hint: If your pellet contained 2 jaws, then your owl consumed at least 2 prey items. However, if your pellet also contained 4 pelvises, then you may draw the conclusion that 4 prey items were consumed.) My owl pellet only contained two skulls, however, there were at least 7 pelvises which would lead me to believe that my owl consumed 7 prey. However, it could also be possible that my owl found remains of rodents and therefore only consumed two full rodents and a few fragments.
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