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Science Notes



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 How to Make Your Food Pyramid

Step One: Decide What Kind of a Biome You are Working With

Your group should already have decided this when designing plants and animals.

I will do the Tundra Biome as an example.

Step Two: Determine KiloCalories per Square Meter per Year

Find the table at http://www.geog.pic.bc.ca/conted/onlinecourses/geog:111/7l.html, an online Geology course created by Dr, Michael Pidwirny at Okanagan College, British Columbia, Canada. This table will give you the number of Kilocalories of food for herbivores produced by the plants growing on one square meter over a year. Find your biome and the number of Kilocalories that will be produced there.
We will go with these standard base numbers.

Tundra Biome produces 600 Kilocalories per square meter per year.

Herbivores will produce a maximum of 7% of food for the predators.

If the predators are eaten, only 1% of the Kilocalories feeds the next level.

To find out more about your biome --

Step Three: List Your Animals:

I will use the lemming as the herbivore and two predators: the Snowy Owl and the Arctic Fox.

List what you know about each animal. Use an average weight for each animal.


weigh 1-2 oz in summer (30-50 grams)

2-4 oz in winter (50-112 grams)

eats grass and mosses

20 day gestation

3 litters of 6-9 in summer

mouse this weight would eat 15 - 50 K a day

 Snowy Owl

23 inches tall

2-3 pounds

Wing span = 60 inches

8-10 eggs

9 baby owls eat 1500 lemmings(150 for one owlet)

adult eats a dozen lemmings a day

 Arctic Fox

Weight 5 to 10 pounds

52 days gestation litter of 3-11 record is 19

wean at 5-9 weeks very high juvenile mortality

ninety days of raising fox litter -- 18,000 lemmings -- 200 lemmings a day

Some of this is interesting but not useful. Condense your information.

 Animal  Weight in Pounds /Ounces  Weight in Grams (Ounces * 28) Kilocalories needed per Day    
 Lemming  1.4 ounces    40    
 Snowy Owl          
 Arctic Fox