BIOL 2903 Lecture Notes - Lecture 4: Northern Bog Lemming, Lichen, Meadow Vole
5 Mar 2018
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Sa: tundra swan, northern grouse, turns white in the winter: willow ptarmigan grouse, stay in the tundra in the winter, white keeps the warm and camouflaged, they have feathered toes and legs, most northern grouse. The tundra also offers severe challenges for plants: high winds - abrasive particles, cold temp, low light, permafrost, lack of nutrients because lack of decomposition, short growing season <140 days. Examples of plants: saxifrage group, tamarack tree: -80c, short tree, moonwort fern, as big as a dime, dwarf birch, arctic willow, labrador willow, dwarf labrador tea. Adaptations for cold: freeze tolerant, cold hardy, short/small, dwarfism. Ex: white spruce: dwarf in tundra, large in southern ontario, pherotypic, retain leaves all year long, heath plants such as labrador tea retain evergreen leaves. Leaves take a long time to grow and require e. Only grow new leaves when warm: evergreen = leaves all year round, darker color"s absorb warmer wavelengths of light.
