BIOL 2060 Lecture Notes - Lecture 6: Cushion Plant, Thermoregulation, Defecation
Document Summary
There are inputs & outputs of energy from an organism that affects its energy budget. Energy inputs: e. g. , absorbed radiation, metabolic heat, conduction. Hnet = hrad + hmet hre-rad +/- hconv +/- hcond hevap. Hconv = heat gained or lost via convection. Hcond = heat gaineed or lost via conduction. Metabolic heat cannot really be adjusted * * * Conduction & convection are good ways to adjust internal temperature. Some plants can angle their leaves in order to reduce heat gain by radiation, or they may have a reflective surface (waxes or hairs) to reduce heat gain by radiation. Evaporative heat transfer is an important mechanism for lowering body temperature, however it doesn"t really work for desert organisms because they cannot afford to lose the water. Not much opporunity for heat loss; does not release much heat to the wind. Growth is close to the group = heat gain by conduction (hcond) Dark pigmented leaves = increased hrad heat gain.
