Archive for the 'algal bloom' Category
Culprit Responsible for Global Toxic Algal Blooms Found
Author: Nina Munteanu26.07.2008
At last the mystery is solved to what causes toxic blue-green blooms in freshwater that yearly kill thousands of aquatic organisms and make people sick.
In a previous post of mine, entitled “Runaway Toxic Microorganisms”, I introduced you to algal blooms and one of algae’s infamous celebrities, Fireweed, a particularly nasty and prolific blue-green alga that pesters the Australian coastline and causes a nasty sickness to h
umans who come into contact with it.
umans who come into contact with it.
Thanks to Sean Yeoman’s Consulting who brought my attention to a recent article in the Victoria Times Colonist by Ed Struzik (July 22, 2008), entitled “Scientists solve riddle of toxic algae blooms”, I came across the work of a limnologist-colleague of mine, David Schindler of the University of Alberta. According to the article, after 37-years of experimentation on Lake 227, a small pristine lake in the Experimental Lakes region of northern Ontario, Schindler’s team 
was able to pin down which chemical nutrients were key to triggering blue-green algal blooms.
was able to pin down which chemical nutrients were key to triggering blue-green algal blooms.
“Phosphorous really is the key,” said Schindler, whose study appears in the U.S.-based Proceedings of the National Academy of Sciences. “Here in Alberta, it is especially important because the phosphorous content in the soil is naturally high, so you don’t have to add a lot to create a serious problem.” In a commentary in the Proceedings, American scientist Stephen Carpenter added that global expansion of aquatic “dead zones” caused by algae blooms is rising rapidly.
Currently 146 coastal regions in the world have been affected by elimination through lack of oxygen of fish and bottom-feeding life forms. One dead zone in the Gulf of Mexico is about the size of the city of New Jersey. And growing. Reminiscent of Fireweed. Off the coast of Sweden each summer, blooms of blue green algae turn the Baltic Sea “into a stinking yellow-brown slush that locals call rhubarb soup,” says Kenneth Weiss of the L.A. Times. “D
ead fish bob in the surf. If people get too close, their eyes burn and they have trouble breathing.” Weiss goes on to describe cases of nuisance and toxic growths all over the world: jellyfish off the Spanish coast; toxic red tides off Florida; smelly green-brown algae off the coast of Maui. “North of Venice, Italy, a sticky mixture of algae and bacteria collects on the Adriatic Sea in the spring and summer. This white mucus washes ashore, fouling beaches, or congeals into submerged blogs, some bigger than a person.”
ead fish bob in the surf. If people get too close, their eyes burn and they have trouble breathing.” Weiss goes on to describe cases of nuisance and toxic growths all over the world: jellyfish off the Spanish coast; toxic red tides off Florida; smelly green-brown algae off the coast of Maui. “North of Venice, Italy, a sticky mixture of algae and bacteria collects on the Adriatic Sea in the spring and summer. This white mucus washes ashore, fouling beaches, or congeals into submerged blogs, some bigger than a person.”
Algal blooms form part of the natural cycles of nature. They occur as a result of several factors that conspire to produce just the right conditions for algae to flourish. These include increased light, temperature and nutrients (which is why 
many blooms occur in the spring and summer). Blooms are usually associated with an aging system, where nutrients tend to concentrate from the years of natural filling in of materials.
many blooms occur in the spring and summer). Blooms are usually associated with an aging system, where nutrients tend to concentrate from the years of natural filling in of materials.
During a “bloom” phytoplankton (floating algae) grow to hundreds to thousands or even millions of cells per milliliter. Fish kills usually happen from loss of oxygen as cells die and decompose. Toxic blooms occur when an algal species (mostly blue-greens) produces neurotoxins, usually under stress or as the cells are dying off; these blooms are typically called Harmful Algal Blooms, or HABs.
Fifty years ago, no one knew the exact cause of algae blooms in lakes and rivers. Evidence suggested that carbon, nitrogen and phosphorous, associated with agricultural runoff and waste water, were mostly responsible. But small-scale experiments weren’t able to show which were more important. Then came Schindler’s groundbreaking experiments in 
northern Ontario in the 1960s and 1970s. I can still remember when I first saw the remarkable 1974 aerial photograph published by the journal Science, that showed two parts of Schindler’s experimental Lake 226. One side was treated with carbon, nitrogen and phosphorous. The other was treated with just carbon and nitrogen. The side that received phosphorous had rapidly developed a huge bloom of blue-green algae. The side without phosphorous addition remained in near-pristine condition.
northern Ontario in the 1960s and 1970s. I can still remember when I first saw the remarkable 1974 aerial photograph published by the journal Science, that showed two parts of Schindler’s experimental Lake 226. One side was treated with carbon, nitrogen and phosphorous. The other was treated with just carbon and nitrogen. The side that received phosphorous had rapidly developed a huge bloom of blue-green algae. The side without phosphorous addition remained in near-pristine condition.
The photo and the study that accompanied it became pivotal in convincing governments in North America and Europe to ban phosphates from detergents and to ramp up or build thousands of new treatment plants to remove phosphorous from waste water. But that wasn’t the end of the issue. Researchers were still convinced that nitrogen played an important role in blue-green proliferation. The idea that nitrogen removal was needed to control the chemical buildup that causes algae blooms known as advanced “eutrophication” persisted.
Schindler’s latest series of long-term experiments shows that nitrogen removal completely fails to control blue-green algae blooms in fresh water ecosystems. He proved this by manipulating 
nitrogen and phosphorus levels on Lake 227 for 37 years. Schindler found that nitrogen control only encouraged algae blooms. Stephen Carpenter predicted that a single-minded focus on nitrogen control would have disastrous consequences for aquatic resources around the world.
nitrogen and phosphorus levels on Lake 227 for 37 years. Schindler found that nitrogen control only encouraged algae blooms. Stephen Carpenter predicted that a single-minded focus on nitrogen control would have disastrous consequences for aquatic resources around the world.
Schindler warns that the struggle to control blue green algae is only going to get worse because industrial, agricultural and municipal growth is pumping more nutrients into water supplies that are decreasing in size and volume. Schindler recommended that governments pull out all stops to control phosphorous to protect wetlands that remove these nutrients from runoff before they reach lakes and streams. He also suggested that natural buffer zones be created to protect lakes and rivers from agricultural, municipal and cottage developments.
read users' comments (6)Runaway Toxic Microorganisms–Friday Feature
Author: Nina Munteanu07.03.2008
Man marks the Earth with ruin. His control stops with the shore—Lord Byron
A few years ago I read a science fiction thriller about a toxic algal plague that terrorized the west coast of British Columbia and Washington. In the book, the toxic algae acted as a self-organized, self-producing entity with purpose and turned out to be a runaway creation of some government lab. Sound familiar? Well… nature produces such things all on her own, too…
One example is Fireweed, a descended strain of bacteria and algae that flourished 2.7 billion years ago, and is otherwise known as Lyngbya majuscule (a blue-green alga or cyanobacteria) that pesters the east coast of Australia by forming unsightly “blooms” and reproducing at an alarming rate. I thank Misque Writer for the note to me about this “rise of slime”, as marine ecologist Jeremy Jackson (Scripps Institution of Oceanography) calls it according to the Los 
Angeles Times. Feeding on industrial waste, Fireweed thrives off the nutrient-rich runoff of modern life in Moreton Bay. It begins each spring with hairy tufts of dark purple slime that spread across the sea floor “fast enough to cover a football field in an hour,” according to the Times. Unwitting fishermen, bringing up their nets, inadvertently come into contact with this venomous weed in the water splashing up. The men soon brake out in searing welts, lips blistering and peeling, with eyes burning and swelling shut.
Angeles Times. Feeding on industrial waste, Fireweed thrives off the nutrient-rich runoff of modern life in Moreton Bay. It begins each spring with hairy tufts of dark purple slime that spread across the sea floor “fast enough to cover a football field in an hour,” according to the Times. Unwitting fishermen, bringing up their nets, inadvertently come into contact with this venomous weed in the water splashing up. The men soon brake out in searing welts, lips blistering and peeling, with eyes burning and swelling shut.
Organisms like Fireweed have been around for eons. They emerged from the primordial ooze and populated the ancient oceans. Over time, higher forms of life gained supremacy. But even the great must fall sometime…
Off the coast of Sweden each summer, blooms of blue green algae turn the Baltic Sea “into a stinking yellow-brown slush that locals call rhubarb soup,” says Kenneth Weiss of the L.A. Times. “Dead fish bob in the surf. If people get too close, their eyes burn and they have trouble breathing.” Weiss goes on to describe cases of nuisance and toxic growths all over the world: jellyfish off the Spanish coast; toxic red tides off Florida; smelly green-brown algae off the coast of Maui. “North of Venice, Italy, a sticky mixture of algae and bacteria collects on the Adriatic Sea in the spring and summer. This white mucus washes ashore, fouling beaches, or congeals into submerged blogs, some bigger than a person.”
Algal blooms form part of the natural cycles of nature. They occur as a result of several factors that conspire to produce just the right conditions for algae to flourish. These include increased light, temperature and nutrients (which is why many blooms occur in the spring and summer). Blooms are usually associated with an aging system, where nutrients tend to concentrate from the years of natural filling in of materials.
During a “bloom” phytoplankton (floating algae) grow to hundreds to thousands or even millions of cells per milliliter. Fish kills usually happen from loss of oxygen as cells die and decompose. Toxic blooms occur when an algal species (mostly blue-greens) produces neurotoxins, usually under stress or as the cells are dying off; these blooms are typically called Harmful Algal Blooms, or HABs. Blooms can occur in both marine and freshwater. In my w
ork as a limnologist (a scientist who studies fresh water), I’ve consulted with governments on the handling and eradication of nuisance algae in lakes and rivers. As Associate Professor Ron Johnstone (Coastal Resource Management Coordinator) said, “There’s no silver bullet or quick fix for this.” As an environmental consultant, I am often in the position of trying to balance the agendas of many stakeholders. My biggest challenge is to achieve a consensus on use and action. Invariably one stakeholder’s priority is in direct conflict with another stakeholder’s priority or with the very ecosystem they are trying to protect. It was over twenty years ago that I told the Burnaby & New Westminster News that “we are often forced by politics to choose only one solution. There is no one solution to a problem such as this. It’s always a compromise.” Geez… I could have told you that. Wait! I did!…
ork as a limnologist (a scientist who studies fresh water), I’ve consulted with governments on the handling and eradication of nuisance algae in lakes and rivers. As Associate Professor Ron Johnstone (Coastal Resource Management Coordinator) said, “There’s no silver bullet or quick fix for this.” As an environmental consultant, I am often in the position of trying to balance the agendas of many stakeholders. My biggest challenge is to achieve a consensus on use and action. Invariably one stakeholder’s priority is in direct conflict with another stakeholder’s priority or with the very ecosystem they are trying to protect. It was over twenty years ago that I told the Burnaby & New Westminster News that “we are often forced by politics to choose only one solution. There is no one solution to a problem such as this. It’s always a compromise.” Geez… I could have told you that. Wait! I did!…
Despite the fact that algal blooms have been occurring since those salad days of the primordial soup, it is apparent to scientists that their occurrence and persistence is accelerated and they are spreading to places they have not been before. According to NOAA, scientists have determined that there are more toxic algal species, algal toxins, affected fisheries resources, food-web disruption, and economic losses from harmful algal blooms than ever before (Anderson et al. 1993). NOAA provides four reasons for this increase in perceived blooms globally: First are improved methods of detection and greater monitoring efforts. These increase the probability that a HAB species will be recorded. Second is the introduction of exotic species via ballast water e
xchange or aquaculture practices (Hallegraeff 1993). A third possibility is that blooms result when grazers fail to control the algal species’ growth (Smayda 1990). Fourth, blooms may result from climate changes, as well as human activities, such as increased pollution and nutrient inputs, habitat degradation including dredging, resource harvesting, and the regulation of water flows. All of these reasons are possible explanations for increasing HABs, and one or any combination of them may apply to a particular species.
xchange or aquaculture practices (Hallegraeff 1993). A third possibility is that blooms result when grazers fail to control the algal species’ growth (Smayda 1990). Fourth, blooms may result from climate changes, as well as human activities, such as increased pollution and nutrient inputs, habitat degradation including dredging, resource harvesting, and the regulation of water flows. All of these reasons are possible explanations for increasing HABs, and one or any combination of them may apply to a particular species.
Kenneth Weiss of the L.A. Times offers this rather bleak future scenario: In many places—the atolls of the Pacific, the shrimp beds of the Eastern Seaboard, the fjords of Norway—some of the most advanced forms of ocean life are struggling to survive while the most primitive are thriving and spreading. Fish, corals and marine mammals are dying while algae, bacteria and jellyfish are growing unchecked. Where this pattern is most pronounced, scientists evoke a scenario of evolution running in reverse, returning to the primitive seas of hundreds of millions of years ago. “We’re pushing the oceans back to the dawn of evolution,” said Jackson. “A half-billion years ago, when the oceans were ruled by jellyfish and bacteria.”
Geez… and just when I thought it was safe to go into the water… And, yes, I didn’t forget that it was Friday… today’s Friday Feature is the powerful microorganism.