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Snow moderates the temperature within the Pika's den.

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Snow moderates the temperature within the Pika's den.

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Flowers are an excellent source of nutrients!

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Flowers are an excellent source of nutrients!

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Pika populations are larger in areas with flowers.  How fashionable Pikas are!

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These hay stacks are their food source through the winter.

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Factors in Ecosystems that affect populations

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Factors in Ecosystems that affect populations

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There a so many factors that affect populations, both directly and indirectly.

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MODIFICATION:  Snow Pack Benefits vs. Non-Snow Years based upon the field researcher information that snow acts as an insulator allowing for thermal regulation (benefit)

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MODIFICATION:  Snow Pack Benefits vs. Non-Snow Years based upon the field researcher information that snow acts as an insulator allowing for thermal regulation (benefit)

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We changed the number of years and the temperature range.

How would parameters need to change to cut the Pika population in half?  What about doubling the population?

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For thousands of years, Pikas (Ochotona princeps) thrived at Mount Lassen, but changes to their environment have put them at risk. Pikas are sensitive to environmental changes because they only thrive in cool climate where they can eat clovers. Changes to temperature or clover growth can be devastating. Use this ...

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MODIFICATION: Type of Food source for Pika (Monocot vs. Angiosperm) based upon the field researcher information that flowering plants are a better food source

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MODIFICATION: Type of Food source for Pika (Monocot vs. Angiosperm) based upon the field researcher information that flowering plants are a better food source