Ecology - (06) Water Relations

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Molles, Cahill - Chapter 6

alluvial groundwater

water that is derived from a surface stream in contrast to groundwater that is derived from underground streams and high water tables. -Page 155

cavitation

rapid formation of air bubbles within the xylem of plants. -Page 155

diffusion

transport of material due to the random movement of particles; net movement is from areas of high concentration to areas of low concentration. -Page 146

hyperosmotic

referring to organisms with body fluids with a higher solute concentration than the external environment (e.g. most freshwater fishes) -Page 146

hypoosmotic

referring to organisms with body fluids with lower solute concentration than the external environment (e.g. most marine bony fishes) -Page 146

matric forces

water's tendency to adhere to the walls of containers such as cell walls or the soil particles lining a soil pore; adhesion and cohesion due to hydrogen bonds -Page 148

metabolic water

water released during oxidation of organic molecules (e.g. six molecules of water are produced during the oxidation of one glucose molecule) -Page 151

osmosis

movement of water across a semi-permeable membrane from an area of high water concentration (low solutes) to an area of low water concentration (high solutes) -Page 146

relative humidity

a measure of the water content of air relative to its content at saturation; ratio of actual water vapour density to saturation water vapour density. -Page 145

saturation water vapour pressure

the pressure exerted by the water vapour in air that is completely saturated (cannot hold any more water vapour) -Page 145

stable isotope analysis

analysis of the relative concentrations of stable isotopes in materials (e.g. 13C and 12C; used in ecology to study the flow of energy and materials through ecosystems. -Page 165

vapour pressure deficit (VPD)

the difference between the actual water vapour pressure and the saturation water vapour pressure at a particular temperature. -Page 145

water potential

the free energy content of water (capacity to do work); water moves from positions of higher free energy to positions of lower free energy; increases as solute concentration decreases -Page 147

water vapour pressure

the atmospheric pressure exerted by the water vapour in air; increases as the water vapour in air increases. Page 145

isosmotic

referring to organisms with body fluids with the same solute concentration as the external environment (e.g. most marine invertabrates) -Page 146

concentration gradients

___ influence hte movement of water between an organism and its environment

terrestrial

___ organisms regulate their internal water by balancing water acquisition against water loss.

aquatic

___ organisms use complementary mechanisms for water and salt regulation.

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