BIOL-4717EL Lecture Notes - Lecture 6: Noctuoidea, Compost, Arctic Tern
4 Mar 2019
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Poikilotherms rattlesnakes 0. 001 to 0. 005*c in north most species of snakes hibernation hibernaculum (massasauga) other species, like garter snake form groups. Naked man: (core temp drops) after 1 hour=-1*c. Rabbit= -45*c upper critical temp (sunstroke, overheating) Behaviours associated with temperatures: most mammals hot sweat cold shiver some species (dog and birds) don"t sweat, they pant pileoerection fur or feathers (fluff up-get air between and heat doesnt leave as easy) Hibernation mammalian true hibernators go into deep sleep, metabolism goes very low, o2 consumption is very low (system is just above working) ie ground squirrels (go below the frost line), ground hogs photoperiod controlled. 90% of what they eat are seals put all subcutaneous fat on in the winter pregnant females make a den males hunt. Torpor sleep during cold spells (few days or at night) hummingbirds metabolism drops each night. Snow hare active all winter during cold night, go under snow in grooves.
