Biology 2483A Study Guide - Skipjack Tuna, Glycerol, Ice
17 Jan 2013
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Ecology lec 5: coping with temperature & water variation. Physical environment impacts organisms success in 2 ways: availability of energy & resources- growth & reproduction, extreme conditions- may exceed tolerance. The actual geographic distribution- also depends on competition, disturbance etc. Climate envelope- a range of conditions over which it occurs e. g aspen tree- predicted vs actual distribution. Physiological ecology: study of interactions between organisms & environments that influence their survival & persistence. Stress- deviation from optimum- reduced rate of process. Acclimatization- adjusting to stress via behaviour or physiology. Short term & reversible (e. g climb mt. Favourable genetic traits increase in frequency (e. g big ears selected to dissipate heat) Acclimatization & adaptation may require trade offs with other functions. Ecotypes - same species but different because had adaptations to different environments. Temperature- internal temp. of organism is important for survival. High limits (bact, archaea 90oc), lower limits- when water freezes in cells (-2 to -5oc)
