46011temp1

46011temp1 - Temperature as an Ecological Factor 1....

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Temperature as an Ecological Factor 1. Background about thermal regimes a. Heat: aggregate internal energy of motion of atoms and molecules within a body b. Temperature: measure of the average kinetic energy of atoms and molecules c. Ultimately, how is temperature biologically important? i. The state of matter (solid, liquid, vapor), such as water, is determined by temperature ii. Temperature-related properties of water: - Specific heat - Heat of vaporization and heat of fusion - Temperature-density relations of liquid water and changes observed as water freezes iii. Structure of macromolecules, e.g., proteins and nucleic acids, and cell constituents, e.g., membranes, is influenced by temperature iv. Chemical reaction rates, which are the basis for metabolic pathways and overall biological processes, are affected by temperature - Average atomic/molecular velocity and kinetic energy affects reaction rates - Almost all biochemical reactions are enzyme-catalyzed, and the molecular structure of such proteins is dependent on temperature, as well as other factors, such as pH, salinity, certain solutes 2. Thermal regimes as a part of weather and climatic conditions a. Weather and climate are products of solar energy inputs together with atmospheric conditions and earth surface features b. Definitions: i. Weather: “condition of the atmosphere at any particular time and place” ii. Macroclimate: Climate = longterm summation of weather events
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This note was uploaded on 10/27/2011 for the course BOT 460 taught by Professor Clambey during the Fall '11 term at ND State.

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46011temp1 - Temperature as an Ecological Factor 1....

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