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Population explosion of organisms that can kill marine life
A harmful algal bloom (HAB), or excessive algae growth, sometimes called a red tide in marine environments, is an algal bloom that causes negative impacts
Harmful_algal_bloom
Spread of planktonic algae in water
fresh water or marine water systems. It may be a benign or harmful algal bloom. Algal bloom is often recognized by the discoloration in the water from
Algal_bloom
Harmful algal bloom event
A harmful algal bloom (HAB) event that started in March 2025 is ongoing along the coasts of the state of South Australia as of February 2026[update].
2025 algal bloom in South Australia
2025_algal_bloom_in_South_Australia
Accumulation of nutrients in water
being introduced. Some harmful algal blooms resulting from eutrophication, are toxic to plants and animals. Freshwater algal blooms can pose a threat to
Eutrophication
Freshwater lake in Northern Ireland
health from toxins and pathogens detected in the algal mats found in the lake. These harmful algal blooms have a number factors contributing to their occurrence
Lough_Neagh
Aquatic, unicellular protists with two flagella
visible coloration of the water, colloquially known as red tide (a harmful algal bloom), which can cause shellfish poisoning if humans eat contaminated
Dinoflagellate
Species of single-celled organism
distinguishes it from a red tide, which is an algal bloom whose toxins lead to harmful effects in people. Although no harmful effects are known, it is recommended
Prymnesium_parvum
Foam created by the agitation of seawater
and lipids) derived from sources such as the offshore breakdown of algal blooms. These compounds can act as surfactants or foaming agents. As the seawater
Sea_foam
Natural freshwater lake in Florida, United States
more phosphorus into the lake, enabling harmful algal bloom. Along with this algal bloom in 2016, other algal blooms have been found to occur in relation
Lake_Okeechobee
nutrient pollution and feed the algae. This leads to eutrophication and harmful algal bloom. Many countries have banned the use of phosphates in detergent, including
Phosphates_in_detergent
activities and the red tide outbreak. Evidence from Comau Fiord where a Harmful Algal Bloom caused a mass die of cold water coral reefs was directly linked to
Aquaculture_in_Chile
For killing and preventing the growth of algae
environments by mitigating the negative effects of harmful algal blooms (HAB). Algicidal bacteria interactions with algal cells can be broadly split into two categories:
Algaecide
Freshwater lake in California
lake can produce blooms often beginning in the spring and lasting through the fall. Referred to as harmful algal blooms (HAB), these blooms consist of solid
Clear_Lake_(California)
U.S. public law
The Harmful Algal Bloom and Hypoxia Research and Control Amendments Act of 2014 (S. 1254; Pub. L. 113–121 (text) (PDF)) is a U.S. public law that reauthorizes
Harmful Algal Bloom and Hypoxia Research and Control Amendments Act of 2014
Harmful_Algal_Bloom_and_Hypoxia_Research_and_Control_Amendments_Act_of_2014
Provision of nutrients to the upper layers of the oceans
at least half the bloom biomass sank below 1,000 metres, where it will likely remain sequestered for centuries. Harmful algal blooms (HABs) are well documented—in
Ocean_fertilization
Toxin produced by cyanobacteria
a few days, but blooms can last weeks. While some of these blooms are harmless, others fall into the category of harmful algal blooms, or HABs. HABs can
Cyanotoxin
Contamination of water by excessive inputs of nutrients
water bodies. Excess nitrogen causes environmental problems such as harmful algal blooms, hypoxia, acid rain, nitrogen saturation in forests, and climate
Nutrient_pollution
Species of pennate diatom found in temperate and sub-tropic marine waters
of California for a federal disaster declaration Effects of this harmful algal bloom on wildlife included mortality and seizures of a wide variety of
Pseudo-nitzschia_australis
Species of protist
bahamense variety was nontoxic and found in the Atlantic, but a 1972 toxic algal bloom of Pyrodinium bahamense in Papua New Guinea showed this was not the case
Pyrodinium
Genus of marine planktonic diatoms
due to increased awareness of harmful algal blooms (HABs) and their implications for human and ecosystem health. Blooms have since been characterized
Pseudo-nitzschia
Wetland in Ohio, Indiana, and Michigan, United States
agricultural runoff has degraded the environment. This causes frequent harmful algal blooms in Lake Erie. According to 19th-century land surveys and Geographic
Great_Black_Swamp
Freshwater lake in Utah County, Utah, United States
the Clean Water Act. In recent years, the lake has been prone to harmful algal blooms or HABs. Utah Lake is managed cooperatively by the Utah Division
Utah_Lake
Microbial mat that forms on the surface of water or rocks
surface as sedimentary rocks. The rapid formation of algal mats can result in harmful algal blooms (HABs), also known as red tides or green tides. HABs
Algal_mat
Genus of bacteria
cyanobacteria that includes the harmful algal bloom-forming Microcystis aeruginosa. Over the last few decades, cyanobacterial blooms caused by eutrophication
Microcystis
Localized die-off of fish populations
the water, which in turn may be due to factors such as drought, harmful algal bloom, overpopulation, or a sustained increase in water temperature. Infectious
Fish_kill
Overview of the environment of the U.S. state of Florida
species and, as a predator of snails, a threat to biodiversity. Harmful algal bloom (HAB) is a natural occurrence of a higher than usual concentration
Environment_of_Florida
Viruses found in marine environments
Viruses are the main agents responsible for the rapid destruction of harmful algal blooms which often kill other marine life. The number of viruses in the
Marine_viruses
Miocene palaeontological locality in Chile
due to poisoning by toxins secreted by algae (events also known as harmful algal bloom). Geological and paleontological evidence indicates that high levels
Cerro_Ballena
tradeoffs resulting from pH imbalances. Although the drivers of harmful algal blooms (HABs) are poorly understood, they appear to have increased in range
Effects of climate change on oceans
Effects_of_climate_change_on_oceans
Species of bacterium
cyanobacteria that can form harmful algal blooms of economic and ecological importance. They are the most common toxic cyanobacterial bloom in eutrophic fresh
Microcystis_aeruginosa
Strong increase in phytoplankton abundance that typically occurs in the early spring
higher and peak biomass occurred later in the spring.[citation needed] Algal bloom Critical depth Gordon Arthur Riley Plankton Mann, K.H., Lazier, J.R.N
Spring_bloom
Diverse group of photosynthetic organisms
Katherine; Fino, Danielle; Shepherd, Adam (2007). "Harmful Algae". US National Office for Harmful Algal Blooms. Archived from the original on 5 December 2008
Algae
frequent harmful algal blooms. Also, during droughts, surface waters are even more susceptible to harmful algal blooms and microorganisms. Algal blooms increase
Effects of climate change on human health
Effects_of_climate_change_on_human_health
Branch of biology concerned with the study of algae
"Chapter 10: Harmful Algal Bloom Dynamics in Relation to Physical Processes" page 130 In Granéli, E. and Turner, J. T. (2008) Ecology of Harmful Algae Springer
Phycology
Eukaryotes other than animals, plants or fungi
Free-living protists can also negatively impact aquatic life as harmful algal blooms. The early evolution of protists corresponds with the evolution of
Protist
One of the Great Lakes in North America
Harmful Algal Bloom (HAB)". National Weather Service. Archived from the original on August 12, 2019. Henry, Tom (August 7, 2019). "Summer algal bloom
Lake_Erie
American limnologist
for her research on nutrient pollution (cultural eutrophication), harmful algal blooms, and the biology and toxicity of the dinoflagellate genus Pfiesteria
JoAnn_Burkholder
Aquatic organism that feeds on planktonic food
availability. Additionally, harmful algal blooms (HABs) can negatively impact many planktivores and can transfer harmful toxins from the phytoplankton
Planktivore
Low levels of oxygen in bottom waters occurring regularly in the Baltic Sea
Food security risks due to declining fish stocks 2. Exposure to harmful algal blooms (HABs), which can produce toxins affecting drinking water and seafood
Baltic_Sea_hypoxia
Cyanotoxins produced by blue-green algae
detected unsafe levels of microcystin in its water supply due to harmful algal blooms in Lake Erie, the shallowest of the Great Lakes. The city issued
Microcystin
Phylum of photosynthesising prokaryotes
contributors to global carbon and nitrogen fluxes. Some cyanobacteria form harmful algal blooms causing the disruption of aquatic ecosystems and intoxication of
Cyanobacteria
Campaign in California
Quality, Environmental Justice Initiatives, and algae bloom reports such as this one. Harmful algal blooms (HABs) are an issue in the San Francisco Bay-Delta
Restore_the_Delta
Species of dinoflagellate
a dinoflagellate species from the genus Karenia that can cause a harmful algal bloom. Its first appearance was in Japan in 1935 and since then, it has
Karenia_mikimotoi
Topics referred to by the same term
Buildings Survey, a program of the United States National Park Service Harmful algal blooms, a dense proliferation of marine or freshwater algae causing negative
Habs_(disambiguation)
Autotrophic members of the plankton ecosystem
efficiency. Phytoplankton blooms in which a species increases rapidly under conditions favorable to growth can produce harmful algal blooms (HABs). Phytoplankton
Phytoplankton
Species of dinoflagellate
brevis flourish and grow to high concentrations, an event termed a "harmful algal bloom" (HAB). While there are many different types of these HABs and the
Karenia_brevis
Explanation of the color of oceans and ocean color remote sensing
called "Red tides." However, not all red tides are harmful, and they are only considered harmful algal blooms if the type of plankton involved contains hazardous
Ocean_color
Genus of brown algae
2013). "Climate Change and Harmful Algal Blooms". US EPA. "Impacts of Climate Change on the Occurrence of Harmful Algal Blooms" (PDF). United States Environmental
Sargassum
"A Balanced Diet for Lake Erie: Reducing Phosphorus Loadings and Harmful Algal Blooms". International Joint Commission. Retrieved 2025-06-16. "Recommended
Central_Basin_of_Lake_Erie
Phytoplankton occurring in freshwater ecosystems
ecosystem health, water quality management, and early warning of harmful algal blooms (HABs). Traditional monitoring includes water sampling followed by
Freshwater_phytoplankton
Order of bacteria
order of cyanobacteria in some classifications which includes the harmful algal bloom Microcystis aeruginosa. Molecular data indicate that Chroococcales
Chroococcales
Syndrome of shellfish poisoning
commonly take place following harmful algal bloom (HAB) events, commonly referred to as "Florida red tide" (given that blooms are more commonplace along
Neurotoxic shellfish poisoning
Neurotoxic_shellfish_poisoning
Seasonal upwelling system in the eastern Great Australian Bight
original on 15 August 2013. Retrieved 18 July 2013. About the Algal Bloom Algal Bloom Update. Government of South Australia. Retrieved 15 October 2025
Great South Australian Coastal Upwelling System
Great_South_Australian_Coastal_Upwelling_System
Species of single-celled organism
human consumption. Because of this, A. catenella is categorized as a harmful algal bloom (HAB) species. While in some areas the causes of HABs appears to
Alexandrium_catenella
Species of alga
alga that episodically forms toxic surface aggregations known as harmful algal bloom. The species name akashiwo is from the Japanese for "red tide". Synonyms
Heterosigma_akashiwo
Species of cephalopod
to deal with anthropogenic threats such as pollution. In 1999, a harmful algal bloom wiped out an entire population of Octopus mercatoris in St Joseph's
Atlantic_pygmy_octopus
Genus of protists
triradiate body scales. The genus is often found in worldwide algal blooms, causing harmful algal blooms (HABs) that devastate the environment or agriculture.
Heterocapsa
Syndrome of shellfish poisoning
needed] Most shellfish can store saxitoxin for several weeks after a harmful algal bloom passes, but some, such as butter clams, can store the toxin for up
Paralytic_shellfish_poisoning
Genus of single-celled organisms
contains some of the dinoflagellate species most harmful to humans, because it produces toxic harmful algal blooms (HAB) that cause paralytic shellfish poisoning
Alexandrium_(dinoflagellate)
US estuary connected to the Gulf of Mexico
from the original (PDF) on December 15, 2016. "General Information| Harmful Algal Blooms | CDC". www.cdc.gov. Retrieved 2017-06-27. Jennifer L. Graham, Neil
Florida_Bay
Species of single-celled organism
$121 million during the last 3 decades due to harmful algal blooms. In the United States harmful algal blooms have estimated annual costs of $50 million
Alexandrium_tamarense
Group of lakes in North America
2010. Retrieved December 7, 2016 – via Colorado.edu. "Lake Erie Harmful Algal Bloom". National Weather Service. "Spring Rain, Then Foul Algae in Ailing
Great_Lakes
tornado Floods Flash flood Coastal flooding Tidal flooding Storm surge Harmful algal bloom Blue green algae Red tide High seas Sneaker wave High tides King
List of severe weather phenomena
List_of_severe_weather_phenomena
Prolonged period of excessively hot weather
"Pelagic harmful algal blooms and climate change: Lessons from nature's experiments with extremes". Harmful Algae. Climate change and harmful algal blooms. 91
Heat_wave
Fresh water reservoir in Michigan, U.S.
experiences algal blooms late in the summer, and the lake water is therefore frequently tested to assess for the presence of harmful algal blooms. The Washtenaw
Ford_Lake_(Michigan)
Species of bivalve
cultural pride and understanding of their heritage. From March 2025, a harmful algal bloom caused by Karenia mikimotoi occurred in South Australia, ongoing
Plebidonax_deltoides
Species of single-celled organism
understand harmful algal bloom events: A comparative approach". Harmful Algae. Recent Progress on the Research and Management of Cochlodinium Blooms. 7 (3):
Cochlodinium_polykrikoides
CDP in New York, United States
with beaches which are occasionally closed for swimming due to harmful algal blooms. The town was home to several former summer bungalow colonies in
Mohegan_Lake,_New_York
Area where land meets the sea or ocean
Coastal waters can be threatened by coastal eutrophication and harmful algal blooms. The identification of bodies of rock formed from sediments deposited
Coast
Single-celled alga with a silica cell wall
genes are also found in red algal plastid genomes, thus demonstrating successive EGT from red algal plastid to red algal nucleus (nucleomorph) to heterokont
Diatom
Virus that infects algae
particular algal virus, known as a cyanophage, can be used to control harmful algal blooms of cyanobacteria. Lytic cyanophages are often found in the presence
Algal_virus
Paralytic shellfish toxin
by humans, usually by consumption of shellfish contaminated by toxic algal blooms, is responsible for the illness known as paralytic shellfish poisoning
Saxitoxin
Object or substance used to attract fish
potentially cause eutrophication in the local water, which may lead to harmful algal blooms. Using inedible lures, on the other hand, is associated with the
Fishing_bait
Family of bacteria
Microcystaceae is family of cyanobacteria which contains the harmful algal bloom Microcystis aeruginosa. The family is characterized by single, floating
Microcystaceae
Luminous phenomenon in the ocean
Meroplankton Pseudoplankton Tychoplankton Blooms Algal bloom Critical depth Cyanobacterial bloom Harmful algal bloom Spring bloom Eutrophication Great Atlantic Sargassum
Milky_seas_effect
Chemical compound
frequency of harmful algal blooms along coastlines in recent years. In 2015, the North American Pacific coast was heavily impacted by an algal bloom, consisting
Domoic_acid
Pollution of oceans from substances discarded by humans
which can lead to harmful algal blooms (eutrophication) which can be harmful to humans as well as marine creatures. Excessive algal growth can also smother
Marine_pollution
Order of single-celled organisms
phytoplankton and are present in oceanic waters. They are well known from harmful algal blooms that cause high mortality of fish. Additionally, they compose a rich
Dictyochales
1999 novel by James Powlik
oceanographer James Powlik. It is an environmental thriller about a harmful algal bloom. "Sea Change by James Powlik". Publishers Weekly. August 2, 1999
Sea_Change_(Powlik_novel)
Organisms living in water or air that drift in the current or wind
Viruses are the main agents responsible for the rapid destruction of harmful algal blooms which often kill other marine life. The number of viruses in the
Plankton
Climate change in the US state of Maine
productivity in the Gulf of Maine dropped 65% between 2001 and 2018. A harmful algal bloom (HAB) occurs when toxin-producing algae grow excessively in a body
Climate_change_in_Maine
"Cyanobacteria of the 2016 Lake Okeechobee and Okeechobee Waterway harmful algal bloom". USGS.org.{{cite journal}}: CS1 maint: multiple names: authors list
Everglades_Agricultural_Area
Tiny lifeforms floating and drifting in the air, carried by the wind
Birgit (2015). "Cyanobacteria and Algae Blooms: Review of Health and Environmental Data from the Harmful Algal Bloom-Related Illness Surveillance System (HABISS)
Aeroplankton
International harmful algal bloom research programme
international research programme on the Global Ecology and Oceanography of Harmful algal blooms. It was initiated in 1998 by the Scientific Committee on Oceanic
GEOHAB
sunlight and consuming large amounts of oxygen upon death. Many algal blooms are also harmful to fish, mammals, and humans when consumed, contaminating water
Nutrient_depletion
Genus of bacteria
Bloom, Cloudy Water, Ammonia/Nitrite Spike - What do I do?". the fishroom. 2019-12-09. Retrieved 2021-04-27. US EPA, OW (2013-06-03). "Harmful Algal Blooms"
Aphanizomenon
Lake in Dane County, Wisconsin
eutrophication of Lake Mendota has led to an increased frequency of harmful algal blooms, which sink to the bottom of the lake when they die. Once at the
Lake_Mendota
Heterotrophic protistan or metazoan members of the plankton ecosystem
endosymbionts to acantharian radiolarians. Phaeocystis is an important algal genus found as part of the marine phytoplankton around the world. It has
Zooplankton
River in the United States of America
resulting in ecological damage. Harmful algal blooms have been documented in the St. Lucie River since the early 1980s. These blooms occur as the result of nutrient
St._Lucie_River
Detergent used for cleaning dishes
contain phosphates. Phosphates make dishes cleaner but can cause harmful algal bloom as wastewater returns to the natural environment. For this reason
Dishwashing_liquid
Toxic chemicals synthesized by algae
Phytoplankton Monitoring Network (PMN) Harmful Algae: Woods Hole Oceanographic Institution Toxic & Harmful Algal Blooms: What you can't see can hurt you Archived
Phycotoxin
Aquatic organisms with multiple life stages
coordinate larval release with times of algal blooms. This synchronicity between release of larvae and algal blooms often leads to meroplankton making up
Meroplankton
Bay in the island of Vieques, Puerto Rico
D.; Hallegraeff, Gustaaf M. (eds.). The Physiological Ecology of Harmful Algal Blooms. NATO ASI Series G, Ecological sciences no. 41. Berlin: Springer-Verlag
Puerto_Mosquito
Device used to identify the presence and the amount of specific molecules in a medium
for filter feeding animals like mussels and to detect the onset of harmful algal blooms (HABs) and/or "red tides" (not necessarily the same thing). Fluorometers
Fluorometer
Microscopic algae
These chemical signals affect large scale tropic structures such as algal blooms but propagate by simple diffusion and laminar advective flow. Microalgae
Microalgae
Fungal members of the plankton communities of aquatic ecosystems
Meroplankton Pseudoplankton Tychoplankton Blooms Algal bloom Critical depth Cyanobacterial bloom Harmful algal bloom Spring bloom Eutrophication Great Atlantic Sargassum
Mycoplankton
Toxin produced by microorganisms
cyanobacteria known as algal blooms can produce cyanotoxins harmful to both the ecosystem and human health. These harmful algal blooms are more likely to
Microbial_toxin
American politician and attorney (born 1942)
became the Harmful Algal Bloom and Hypoxia Research and Control Amendments Act of 2014, which reauthorized and modified the Harmful Algal Bloom and Hypoxia
Bill_Nelson
Chemical compound
Tang, Yinjie J. (2022). "Mineral-hydrogel composites for mitigating harmful algal bloom and supplying phosphorous for photo-biorefineries". Science of the
Calcium_phosphate
Mass of Sargassum in Atlantic Ocean
Sargassum Belt (GASB) is a recurring Sargassum bloom in the Atlantic Ocean. It is the largest macroalgae bloom in the world to date. The GASB has ecological
Great_Atlantic_Sargassum_Belt
HARMFUL ALGAL-BLOOM
HARMFUL ALGAL-BLOOM
Girl/Female
Australian, French, Irish
Elf Spear
Boy/Male
Indian
Hateful
Boy/Male
Biblical
Careful.
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Telugu
Dear; Cheerful; Deer
Boy/Male
Indian
Careful
Boy/Male
Muslim
The creator of the harmful
Boy/Male
Anglo, British, Christian, English, German
Noble Spearman; Spear from the Elves
Boy/Male
Anglo Saxon English
Noble spearman.
Boy/Male
Indian
The creator of the harmful
Boy/Male
Arabic, Muslim
Good
Boy/Male
Arabic, Muslim
Comforter
Biblical
careful
Boy/Male
Muslim
Hateful
Male
English
Middle English form of Anglo-Saxon Ælfgar, ALGAR means "elf spear."Â
Boy/Male
British, English
Harmful
Girl/Female
Welsh
Hateful.
Girl/Female
Indian, Sikh
Cheerful
Boy/Male
Anglo Saxon
Hateful.
Boy/Male
Hindu
Deer, Funny, Cheerful
Boy/Male
British, English
Careful
HARMFUL ALGAL-BLOOM
HARMFUL ALGAL-BLOOM
Boy/Male
Indian, Sanskrit
Energy; Vigour; Strength
Male
English
English surname transferred to unisex forename use, derived from a Norman French byname for an unfortunate person, from Old French malheure, MALLORY means "unfortunate, unhappy, unlucky."
Girl/Female
Indian, Telugu
Poison
Boy/Male
Tamil
Chitayu | சிதாயà¯à®‚
Descended from thought
Boy/Male
Muslim
Restrainer. Controller of anger.
Surname or Lastname
English
English : habitational name from a place in Staffordshire named Engleton, from Old English Engla (genitive plural of Engle ‘Angle’) + tūn ‘settlement’.
Girl/Female
Hindu, Indian
Herb
Surname or Lastname
English
English : perhaps from a pet form of Dennis 1.variant of German Tennis.
Boy/Male
Indian
Male
Chinese
benevolent forbearance.
HARMFUL ALGAL-BLOOM
HARMFUL ALGAL-BLOOM
HARMFUL ALGAL-BLOOM
HARMFUL ALGAL-BLOOM
HARMFUL ALGAL-BLOOM
a.
Hurtful; harmful; baneful; pernicious; injurious; destructive; unwholesome; insalubrious; as, noxious air, food, or climate; pernicious; corrupting to morals; as, noxious practices or examples.
pl.
of Alga
a.
Abounding in capacity to warm; giving warmth; as, a warmful garment.
a.
Full of teen; harmful; grievous; grieving; afflicted.
a.
Cunning; disposed to cunning indirectness of dealing; crafty; as, an artful boy. [The usual sense.]
a.
Tending to impair or damage; injurious; mischievous; occasioning loss or injury; as, hurtful words or conduct.
pl.
of Armful
a.
Pertaining to, or like, algae.
a.
Causing injury or harm; hurtful; harmful; detrimental; mischievous; as, acts injurious to health, credit, reputation, property, etc.
a.
Doing evil to others; harmful; mischievous.
a.
Harmful; doing damage; pernicious.
n.
As much as the arm can hold.
a.
Mischievous; harmful; dangerous.
n.
Same as Agar-agar.
a.
Taking care; giving good heed; watchful; cautious; provident; not indifferent, heedless, or reckless; -- often followed by of, for, or the infinitive; as, careful of money; careful to do right.
a.
Hurtful.
a.
Full of harm; injurious; hurtful; mischievous.
a.
Abounding with charms.
n.
Alt. of Argali
a.
Causing mischief; harmful; hurtful; -- now often applied where the evil is done carelessly or in sport; as, a mischievous child.