Glossary

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ecological nichessearch for term
A habitat supplying the factors necessary for the existance of an organism or species. The ecological role of an organism in a community especially in regard to food consumption.
efficacysearch for term
Effectiveness.
emergentsearch for term
Rooted in shallow water and having most of the vegetative growth above the water.
emersedsearch for term
Rooted in shallow water and having most of the vegetative growth above the water. Synonymous with emergent.
epilimnionsearch for term
A surface layer of water overlaying the thermocline of a lake.
eradication search for term
To do away with completely. To thoroughly exterminate and remove.
establishment numbersearch for term
A number assigned to registered pesticides by the U.S. EPA that indicates the location of the manufacturing or formulation facilities of that product.
euphotic zonesearch for term
Zone where there is sufficient light for the growth of plants.
eutrophicsearch for term
Enriched in dissolved nutrients.
eutrophicationsearch for term
The process by which a body of water becomes enriched in dissolved nutrients (as phosphates) that stimulate the growth of aquatic plant life usually resulting in the depletion of dissolved oxygen.
evaporationsearch for term
The process by which water vaporizes and escapes from water surface, rising into the atmosphere. Evaporation rates are affected by latitude of the water body (solar energy input), air and water temperatures, air pressure, wind velocity over the water surface, and turbulence in the water. Evaporation rates are also influenced by the plant coverage on the lake’s surface. In general, evaporation decreases as emersed plant and floating plant coverage increases. Floating-leaved plants can however reduce the evaporation loss of water in a lake.
evapotranspirationsearch for term
The process by which water vapor is taken up and used by plants, and transpired (emitted as water vapor) to the atmosphere. In most situations, aquatic macrophyte evapotranspiration greatly increases water loss from a water body. Evapotranspiration rates depend on plant characteristics such as height and leaf area index as well as environmental factors such as latitude, air and water temperatures, wind speed, relative humidity, plant growth phase and nutrient availability.
exposuresearch for term
Route of entry into the body (dermal, inhalation, or ingestion).