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Characterised by the presence of free or molecular oxygen; requiring such conditions to live.
Fine sediments deposited by floods.
Characterised by the absence of free oxygen; able to live in such conditions.
Mire containing acid-loving plants.
Area of ground which collects and feeds water to a given waterway or wetland.
Group of plants and/or animals living together under characteristic, recognisable conditions.
Water of no or extremely low productivity.
Study of how living things relate to their environment or surroundings.
Water of high productivity.
The process by which a water body becomes more productive over time.
Mire containing neutral- or alkaline-loving plants.
Area of soil in which nutrients accumulate due to water inflow or soil movement and breakdown.
Unsorted clays, sands, gravels and stones left by melting glaciers.
The recognisable area or type of environment in which an organism normally lives.
The difference in the depth of water at any two points, or the measure of the pressure at the lower point expressed in terms of this difference.
Study of the behaviour of flowing water.
Hydrogen potential (pH)
A measure of the relative acidity or alkalinity of water or soil.
Study of the laws and properties of water.
The process by which percolating water removes nutrients from the soil.
Artificial channel, the main purpose of which is to supply water to another waterway or to water-powered mills.
Broad leaved plant.
Area of mineral-based soil in which the summer water level is close to the surface, but seldom much above it.
Water of medium productivity.
Area of permanently wet peat.
The process by which one community of organisms gives way to another in an orderly series from colonisers to climax.
Water of low productivity.
A hard, distinct soil layer caused by the precipitation of iron or other compounds.
Soil made up entirely of organic remains.
Internal erosion of a dam, usually by water seeping along a pipe or up from below.
Description of ecosystem in terms of ‘biomass’ (total mass of living organisms).
Build-up of erosion material in a watercourse.
Fine sediments deposited in still water.
A rough unit of measurement used in digging, equal to the length of a spade blade.
Colouration of water by dissolved substances.
Area of mineral soil normally flooded in the growing season and dominated in most cases by emergent macrophyte.
The pollution of water by suspended matter.
Level below which the soil is waterlogged.
The occurrence of communities in distinct geographical areas or zones.