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Tracking Changes in Photoperiod Around the Globe

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  • Challenge Question #1

    kevin adams (bob1@knet.flemingc.on.ca)
    Wed, 5 Mar 1997 21:10:09 GMT

    Four species groups answered this question:

    1. Bald Eagles
    Seasonal changes and photoperiod can injure and help our animal. In
    the winter the ice freezes and the days are shorter and the Bald Eagle can't
    find one of its favourite prey--fish. In the summer the days are longer and
    warmer, so the Bald Eagles live well, as they have access to their food. In
    the spring the eagle usually mates, then that's when their is a big demand
    for food, and that's when there is a lot of food available for the eagle.

    Andrew Beatty, Scott McKenzie gr. 5

    2. Humpback Whales

    During the winter, the whales migrate south to warmer waters to have
    their babies. After they give birth in the summer, they migrate north to
    colder waters to feed on the krill.
    When the days get longer, the whales know that summer is coming and
    they migrate north. When the days get shorter (and colder), they migrate
    south to have their babies in warm waters.

    Dustin Crowe & Deanne McIntosh gr.5

    3. Caribou

    In the spring time when the snow finally begins to melt,
    temperatures can drop and may re-freeze, making it impossible to dig for food.
    In the summer, it can be a bad time of year for the caribou because
    not just the adult wolves need to be fed, but their pups too. So more
    caribou die because of the warmer temperatures/long photoperiod.

    Doug McKenzie gr.5

    4. Monarch Butterflies

    The monarch eats goldenrod and milkweed. When the frost starts
    (less photoperiod --fall) coming in, these plants die off, so the butterfly
    has nothing to eat in Canada. To add to its problems, it's too cold (less
    photoperiod) for them. So they migrate to Mexico, where it is warmer.
    They come back when the weather gets warmer (spring) and the
    milkweed and goldenrod are starting to bloom again. They feed here in
    Canada all summer, then the cycle starts again (fall-spring & spring-fall).

    Shannon Mitchell & Lee Taylor gr. 5

    Bobcaygeon Public School
    Bobcaygeon, Ontario
    44.536 N, 78.544 W