See Harmful Algal Bloom

Excessive, or dense growths, of a single or several species of algae. Usually of relatively short duration but may persist for extended periods.

A condition resulting from excessive nutrient levels or other physical and chemical conditions that enable algae to reproduce rapidly.

Occurs when algae grow very fast to accumulate into dense patches near the water's surface. “Harmful algal blooms” contain toxins or cause negative impacts.

An explosive population increase in algae that occurs when large amounts of phosphates and/or nitrates enter a body of water in the presence of warm temperatures.

An explosive growth of Algae which discolors the water and can lead to oxygen depletion.

extremely high concentrations of nutrients (nitrates and phosphates) causing overproduction of algae and eventual depletion of oxygen

fast-growing microscopic, single-cell algae, as opposed to beneficial blue-green algae, that block out light and kill water life, and alter marine habitats.

an explosive increase in the population of phytoplankton. Algal blooms are often associated with excess nutrients (eutrophic) conditions and can be composed of noxious algae species.

a large growth of a kind of microscopic plant called algae

a population explosion of microalage algae where cell densities may exceed millions of cells per liter water

a relatively rapid increase in the population of (usually) phytoplankton Phytoplankton refers to the algal component of the plankton that drifts in the water column

A rapid overgrowth of algae caused by an excess of nutrients.

Sudden growth of algae in aquatic ecosystems. Algal blooms may be induced by nutrient enrichment of waters due to pollution.

Discolouration of the water environment due to a change in species composition and abundance of marine and estuarine microalgae.

an abundant growth of phytoplankton, typically triggered by sudden favourable environmental conditions e.g. excess nutrients. Typically seen in the spring in UK waters.

Population explosion of phytoplankton in response to optimal growth conditions, including nutrient over?enrichment from wastewater and nonpoint sources. Blooms can result in oxygen depletion and biological impacts; see also eutrophication.

A rapid accumulation of living organic matter (usually on the water's surface). Possible results of blooms include water quality deterioration, algae dying & breaking down, algae consuming the dissolved oxygen and releasing toxins.

a sudden increase in the amount of algae, usually causing large floating masses to form. Algal bloom can affect water quality by lowering dissolving oxygen (DO) content and decreasing sunlight penetration. The blooms are usually caused by excessive nutrient addition and can be characteristic of a eutrophic lake.

the rapid growth of algae in a lake or other body of water

A condition which occurs when excessive nutrient levels and other physical and chemical conditions facilitate rapid growth of algae. Algal blooms may cause changes in water color. The decay of the algal bloom may reduce dissolved oxygen levels in the water.

a sudden increase in the amount of marine algae (seaweed) often caused by high levels of phosphates, nitrates, and other nutrients in the nearshore area.

A lush growth of algae, fueled by warm temperatures and abundant nutrients

large populations of algae which form in nutrient-rich and polluted waters

sudden, massive growths of microscopic and macroscopic plant life, algae, and cyanobacteria, which develop in lakes, reservoirs, and marine waters

Rapid growth by algae producing large quantities of plant material which can result in low dissolved oxygen conditions as the algae dies and decays. Low dissolved oxygen can result in the death of fish and other aquatic organisms.

A rapid increase in the abundance of phytoplankton or benthic algae in a given area.

Excessive algal growth triggered by sunlight, warm temperatures, still waters and dissolved nutrients, often from sewage, fertilisers or detergents

Excessive algal growth caused by an oversupply of nutrients in a waterway.

Sudden, massive growths of microscopic and macroscopic plant life, such as green or bluegreen algae, which develop in lakes and reservoirs, which can affect water quality adversely and indicate potentially hazardous changes in local water chemistry.

Rapid growth of algae in surface waters due to an increase in nutrients such as nitrogen and phosphorus.

An unusual, sudden or excessive abundance of algae. Algal blooms can adversely affect water quality.

Rapid growth of algae ( Referred to as green water, pea soup)

A rapid increase in the numbers of algae, usually caused by a change in the flow, light, temperature or nutrient levels of the water in which it lives.

A conspicuous concentration of phytoplankton, often concentrated at or near the surface. It is difficult to quantify what constitutes a "bloom". but a rough estimate places it as a chlorophyll concentration over 30 µg/L. Blue-green algae are the predominant type of algae in most blooms in Alberta.

Large, readily visible, masses of algae (usually green algae), found in bodies of water (usually lakes or ponds) during warm weather.

Rapid growth of algae on the surface of lakes, streams, or ponds; stimulated by nutrient enrichment.

The occurrence of a high concentration of microscopic plant life, such as green or blue-green algae (cyanobacteria), in a river, lake and reservoir, usually as a result of increased nutrient content.

Sudden, massive growths of micro- scopic and macroscopic plant life, such as green or blue- green algae, which develop in lakes and reservoirs

a situation often caused by excess nutrients whereby algae grow and reproduce rapidly, often forming dense mats on the surface of the water. Algae blooms can cause unpleasant conditions for swimmers or boaters.

Heavy growth of algae in and on a body of water, often a result of high nutrient concentrations when occurring frequently through the year, although blooms are a normal occurrence in spring in many area lakes

A large, visible mass of algae found in surface water bodies.

population explosion of algae in surface waters due to an increase in plant nutrients such as nitrates and phosphates.

a sudden, excessive growth of algae in a waterbody.

a heavy growth of algae in or on a body of water as a result of high phosphate concentrations (usually caused by fertilizers and/or detergents)

excessive growth of aquatic algae resulting from nutrients such as nitrogen and phosphorus being added to the environment.

An algal bloom is a relatively rapid increase in the population of (usually) phytoplankton algae in an aquatic system. Algal blooms may occur in freshwater as well as marine environments. Typically only one or a few species are involved and some blooms may be recognized by discoloration of the water resulting from the high density of pigmented cells.