BIOL 1902 Lecture Notes - Lecture 10: Rete Mirabile, Acer Rubrum, Cool Air
24 May 2015
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Cell membrane become more flexible but doesn"t allow ice to penetrate it: retaining needles creates new problems, damage by solar radiation. Solution is xanthophyll pigments which enables chlorophyll to use sun"s energy to create heat, no to photosynthesis: skunk cabbage turns up the heat. Heat up enough to melt the snow around it: dessication drying out; is another problem. Calm, sunny days are the worst (wind doesn"t affect): ex. Have small leaf surface area as a way to lose less water. Can close of stomata pores to lose less water too. The needles as have thick cuticles as a water evaporation barrier: ex. Leaves of some northern plants have hairs on underside of leaves. Created a barrier for the airflow and can help trap moisture if it tries to escape out of the leaves: ex. Evergreen ferns reduce surface area by rolling up. Reduces exposure to the air around them so they lose less moisture: ex.
