Biology 2483A Lecture Notes - Lecture 3: Stoma, Water Conservation, Acclimatization
9 Oct 2017
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Topic: coping with environmental variation temperature and water. Biomes are defined by the vegetation type. *not responsible for physiology of water: each species has a range of environmental tolerances that determines its potential geographical distribution. Tolerance: polar bears tolerate arctic conditions year-round: involves an adaptation. Avoidance: arctic terns migrate to avoid the arctic winter. A species" potential geographical distribution is constrained by : the physical environment. A tree can grow on a rock without soil to put its roots in, but it is able to tolerate these unfavorable conditions. The physical environment on this rock will restrict other plants that are located in the same biome because of the lack of resources and energy: its physiological tolerance limits and extreme environmental conditions. Tolerance curve: highest abundance in middle of temperature range: salinity, precipitation all affect the tolerance of the organisms. Climate envelope: range of climate conditions under which a species occurs.
