Biology 2483A Lecture 3: 03 Chapter 4
3 Nov 2017
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Document Summary
The temperature of an organism is determined by exchanges of energy with the external environment. The water balance of an organism is also important. Each species has a range of environmental tolerances that determines its potential geographical distribution. Avoidance: arctic terms migrate to avoid the arctic winter. A species" potential geographical distribution is constrained by. Under or below a certain temp, will not tolerate. Climate envelope= range of climate conditions under which a species occurs. Dark lines are boundaries (upper= late frost, lower= drought) A species" actual geographical distribution is constrained by. Limiting distribution due to competition between two barnacle species. Individuals respond to environmental variation through acclimatization (acclimation) If environment varies (i. e. climate change), tolerance curve can shift right. Creates selection pressure, not evolution but if isolated, can be evolution. Acclimation/acclimatization and adaptation require investment of energy and resources. Increased survival and reproduction under specific environmental conditions.
