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Organismsal Phys lect sept 18.docx

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Biology 2601A/B

Organismsal Phys Lect Sept 18 Thermoregulation in ectotherms ** earlier lect! Thermoregulation Water bird foraging in water 7 degrees but it can maintain its body temp What happens if you’re an ectotherm? Does not generate internal heat Poikiotherm Table slide Going with the flow Are they at the mercy of their environment? If you’re in a desert its extremely hot and you’re very exposed, and it gets very cold at night, exposed to big night sky which is a huge heat sink (losing heat to the sky constantly) Can ectotherms do anything to moderate their own temperature? Rabbit arrow slide All the different components of the nrg balance of an organism Radiation (direct from sun, being reflected off particles in athmosphere, infared radiation, organism is also giving off infared radiation) Convection (wind chill, water flowing, winter wind – suck heat off you faster, if you’re in the desert warm wind makes you warmer) Conduction; exhcnage of heat with a solid Latent heat- evaporation ar condensation of water R+H+C+L+M=0 Plants can affect leaf temp Left: hrown In extremely hot arid environment, leaves are covered with white hairs, what it does is the equicalent of us wearing a white tshirt, reflect more radiation- changes leaf colour depending Right: alex Behavioural Change surface area, curling and exposing less sirface area an dpointing straight up to the sun, leaves absorb less sun, also reduces the amount of water they use, conserves their water Graph slide Animals do this too Most of them are 32-33 degrees, they go into the sun to warm up, go into shade to cool down, try to stay at optimal temperature Right: if the lizards weren’t dong anything behavioural this is what it would look like They find ways to keep themselves in the narroe temp range on the left Plants affect leaf temp Transfer of nrg to molecules of leaf to the wind, occurs most frequently on the tips of the leaf, you get these areas that can warm up quickly Alex Single oak branch Leaves connected to the branch One leaf is operating at 32 degrees, blue one is at 19, the researchers taking the pic sprayed the bottom leaf woth water to show the affect of evaporation and transpiration In general the normal leaves are at around 25, if you prevent transpiration you maximize heat, if you promote it is cools down *** start of lect sept 18 Metabolism There are a lot of species that produce metabolic heat – the flower shown is one- Right pi is a skunk cabbage- heat produced melts snow around it allowing it to develop early Plant is tryi
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