RED ALERT Fish are dying
I
Tuesday, August 24, 2010
Gulf oil spill: Has it caused a new fish kill?
Gulf oil spill: Has it caused a new fish kill? (UPDATED)
August 23, 2010 | 4:47 pm
Louisiana state biologists Monday were investigating whether a large fish kill at the mouth of the Mississippi River was caused by oil or dispersants from the BP spill in the Gulf of Mexico. The gulf also contains a vast dead zone created by agricultural runoff along the river.
"By our estimates, there were thousands, and I'm talking about 5,000 to 15,000 dead fish," St. Bernard Parish President Crag Taffaro said in a news release Monday. "Different species were found dead, including crabs, sting rays, eel, drum, speckled trout, red fish, you name it, included in that kill."
The fish were found floating at the top of the water, collected along plastic booms that were placed to contain millions of gallons of oil from the spill that was touched off by the April 20 explosion of BP's Deepwater Horizon drilling rig. The oil flowed into the gulf until July 15 when the gusher was capped.
A half-mile long swirl of thick substance with several tar balls and a strong smell of diesel was discovered Monday around Louisiana's Grassy Island, St. Bernard Parish officials announced. Skimmers were collecting the scum.
"There is what we believe to be some recoverable oil in the area," Taffaro said. "We will be sampling that and recovering what we can. We don't want to jump to any conclusions because we've had some oxygen issues by the Bayou La Loutre Dam from time to time.
"The Marine Division of Wildlife and Fisheries is on it ... It does point to the need for us to continue to monitor our waters."
According to St. Bernard Parish spokeswoman Karen Bazile, the fish were found in the Mississippi River Gulf Outlet, a 76-mile shipping shortcut from the Gulf of Mexico to New Orleans that was dug by the U.S. Army Corps of Engineers in the 1960s. "It is blamed for massive wetlands loss and is widely believed to have worsened the flooding from Hurricane Katrina," she said in an e-mail. "Since that storm, the federal government has paid for a rock structure across the channel at Bayou La Loutre to stop the flow of salt water, also putting an end to shipping in the channel."
UPDATE: On Monday evening, St. Bernard Parish oil disaster information officer, Jennifer Belson, said that preliminary testing by the state's Wildife & Fisheries indicated that the cause of the fish kill was "hypoxia" or lack of oxygen. "But we don't have the final testing back," she said. Hypoxia is most often caused by an excess of nitrogen and phosphorus from agricultural fertilizer or human waste, but it can also be caused by chemical dispersants, which were used extensively after the oil spill.
Ralph Portier, an environmental scientist at Louisiana State University, cautioned in an interview that, "A lot of things can explain a fish kill, which is not uncommon during the hot summer weather in Louisiana. It could be the nutrient-rich environment with a lot of heat. It could be rainfall. It could be changes in salinity or upwelling from disturbed sediment."
The Mississippi River Gulf Outlet, he noted, is "like a dead end canal with water that does not mix as much as you would like it to." If oil were the cause, he said, he would expect a more gradual, rather than a sudden fish kill.
But he said he could not rule out that the fish kill could be related to the oil spill. Fresh water, which has been diverted into the marshes since the spill, can change salinity levels and affect fish, he noted. The fish kill announcement, he said, "goes to show how sensitive the (oil spill) issue is. You can imagine the angst of a lot of people in the sea food industry when they hear about a fish kill now."
-- Margot Roosevelt
Friday, August 20, 2010
Chlorophyll f
Chlorophyll gets an ‘f’
New variety of photosynthetic pigment is the first discovered in 60 years
Web edition : Thursday, August 19th, 2010
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RED LIGHT, GREEN LIGHTAn organism bearing a never-before-seen form of chlorophyll, which can absorb rays that most photosynthesizers can’t use, dwells in knobby chunks of rock and algae known as stromatolites (above) that pepper Shark Bay, Australia.Happy Little Nomad/Wikimedia Commons
A new kind of chlorophyll that catches sunlight from just beyond the red end of the visible light spectrum has been discovered. The new pigment extends the known range of light that is usable by most photosynthetic organisms. Harnessing this pigment’s power could lead to biofuel-generating algae that are super-efficient, using a greater spread of sunlight than thought possible.
“This is a very important new development, and is the first new type of chlorophyll discovered in an oxygenic organism in 60 years,” says biological chemist Robert Blankenship of Washington University in St. Louis.
The newfound pigment, dubbed chlorophyll f, absorbs light most efficiently at a wavelength around 706 nanometers, just beyond the red end of the visible spectrum, researchers report online August 19 in Science. This unique absorbance appears to occur thanks to a chemical decoration known as a formyl group on the chlorophyll’s carbon number two. That chemical tweak probably allows the algaelike organism that makes chlorophyll f to conduct photosynthesis while living beneath other photosynthesizers that capture all the other usable light.
“In nature this very small modification of the pigment happens, and then the organism can use this unique light,” says molecular biologist Min Chen of the University of Sydney in Australia. Chen and her colleagues identified the new pigment in extracts from ground-up stromatolites, the knobby chunks of rock and algae that can form in shallow waters. The samples were collected in the Hamelin pool in western Australia’s Shark Bay, the world’s most diverse stromatolite trove.
Previously there were four known chlorophylls made by plants and other photosynthesizing organisms that generate oxygen: a, b, c and d. Chlorophyll a, the standard green type, is found in photosynthesizers from algae to higher plants. It absorbs mostly blue light around 465 nanometers and red light around 665 nanometers (it reflects green light, hence plants look green). Chlorophylls b and c are found in fewer organisms and absorb light in a similar range as chlorophyll a does, but shifted a bit. Chlorophyll d, found in a specific group of cyanobacteria, absorbs the most light at roughly 697 nanometers, a slightly shorter wavelength than the absorption of the new chlorophyll.
While some bacteria make chlorophyll-like pigments that absorb even longer wavelengths of light, these creatures aren’t harnessing light to split water, the step in photosynthesis that generates oxygen. Scientists didn’t think that wavelengths absorbed by chlorophyll f would have enough oomph to split water either, but it turns out they do, says Chen.
“This challenges our conception of the limit of oxygenic photosynthesis,” she says.
The find may also enable scientists to engineer algae that are more efficient producers of oil for biofuels, says algae biologist Krishna Niyogi of the University of California, Berkeley. Microbes bearing the new chlorophyll could soak up rays that most microbes can’t make use of.
There is still much to be learned about the new type of chlorophyll and the organisms that make it, Niyogi says. Chlorophyll f was extracted from the ground-up stromatolites along with a lot of chlorophyll a. It isn’t clear what creature was making chlorophyll f, but evidence points to a filamentous cyanobacterium. This cyanobacterium might use both chlorophylls, or perhaps just f.
Wednesday, August 18, 2010
MPs call for action to save Lake Urmia
http://www.tehrantimes.com/index_View.asp?code=225139
MPs call for action to save Lake Urmia
Tehran Times Social Desk
TEHRAN - Twenty Majlis lawmakers have written a letter to President Mahmoud Ahmadinejad calling for immediate action to save Lake Urmia and prevent the environmental degradation of the body of water.
The surface of the salt water lake recently turned red due to a phenomenon known as red tide.
Experts have long warned that natural factors, coupled with human activity, will cause Lake Urmia to dry up in the near future if nothing is done.
Meanwhile, the deputy director of Iran's Environmental Protection Organization has said evaporation due to microscopic changes in magnesium compounds in the water turned the lake red.
“Salts containing magnesium in the lake have been concentrated as a result of the evaporation process. Such compounds give the water a red tone,” Mohammad-Baqer Sadouq told the Mehr News Agency on Wednesday.
Declining rainfall, climate change, and rising temperatures are accelerating the evaporation process at the lake, Sadouq noted.
Environmentalist Masoud Baqerzadeh-Karimi has dismissed the claim that wastewater is the cause of the rare red tide phenomenon, adding that if that were the case, the lake water would have turned red many years ago.
The director of the West Azarbaijan Province Department of the Environment, Hassan Abbasnejad, believes that a type of algae is responsible for the red tides.
“Dunaliella salina is a type of algae that creates a red substance in order to adapt to salty environments and survive,” he explained.
Lake Urmia, which is located in northwestern Iran, has a surface area of approximately 5,200 square kilometers.
UNESCO has registered Lake Urmia as a Biosphere Reserve, and it is listed as a wetland of international importance under the 1971 Ramsar Convention.
It is one of the largest natural habitats for the tiny Artemia, which is a genus of aquatic crustacean that serves as a food source for flamingos and other migratory birds.
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Please see the previous two posts too.
Red coloured water may be due to many reasons - algae bloom - Red tide or Dunaliella salina or just due to magnesium.
Global warming reddens Lake Orumieh [not red tide]
Experts have ruled out speculations that "red tide" might have caused Lake Orumieh to turn red, blaming the rare phenomenon on global warming.
Lake Orumieh, the second largest salt water lake on earth, turned red as global warming accelerates the evaporation of the lake and gives a red tenor to water.
“Serious evaporation causes microscopic changes in magnesium compounds in the water. Such changes can initiate the red color of the body of water,” Mohammad-Baqer Saddouq, deputy of Iran's Environment Organization told Mehr news agency on Wednesday.
Saddouq discarded the algae bloom theory, saying the algae cannot survive in the mineral-rich water of Lake Orumieh, theorizing that a possible change in the salt compounds might have caused the incident.
“Salts with magnesium in the lake have been intensified and concentrated as a result of the evaporation process. Such compounds give a red tone to the water,” he said.
“Allowing such salt to dry will turn it white,” Saddouq further explained.
Declining rainfall, climate change, and rising temperatures accelerate the evaporation process of the lake, which link to global concerns over the issue.
Experts have warned that ecological factors, together with human activity, will eventually lead to the drying up of Lake Orumieh.
UNESCO has registered the Lake Orumieh as a Biosphere Reserve; it is listed as a wetland of international importance under the 1971 Ramsar Convention.
Tuesday, August 17, 2010
Iran's Lake Orumieh turns red [with RED TIDE]
http://www.presstv.ir/detail/138985.html
Soap-like foam substance produced by algae started to redden Orumieh from the East Azarbaijan coast and gradually covered the whole lake.
The "red tide" is actually the result of an algal bloom, an event in which marine or fresh water algae accumulate rapidly in the water.
The effect of excessive algae on fish can be lethal. It produces oxygen radicals which can damage fish gills, possibly leading to suffocation.
Some environmentalists say the phenomenon is caused by nutrient loading from human activities or industrial and city wastewater which include nitrates and phosphates.
Other experts, however, say the algae cannot survive in the salty water of the Lake Urmia and a possible change in the salt compounds might have caused the incident.
“When the salinity reaches the point of oversaturation, the salt compounds change,” environmentalist Masoud Baqerzadeh-Karimi told Mehr News Agency.
“The change causes some types of salts, especially those with sodium compounds and white crystals, settle down and those with magnesium and orange crystals remain in the water,” he added.
Baqerzadeh-Karimi rejected the role of wastewater in the phenomenon, saying that in that case “the lake should have turned red many years ago.”
Head of West Azarbaijan environment department Hassan Abbasnejad believes a type of algae is responsible for the incident.
“Dunaliella Salina is a type of algae that creates a red substance in order to adapt to salty environments and survive,” he explained.
The world's second largest salt water lake on earth, the Lake Urmia has faced a lot of environmental problems during the last few years.
Experts have warned that ecological factors and human activity will lead to the drying up of Lake Urmia in the near future.
The maximum depth of the lake has fallen from 12 to six meters and salt levels have reached 340 grams per liter, way above the standard level of 180 to 220 grams per liter.
The water body and its surroundings are home to some 212 species of birds, 41 reptiles, 7 amphibians, and 27 mammals, including the Iranian yellow deer.
It is considered to be one of the largest natural habitats for the tiny Artemia, which serves as a food source for migratory birds, such as flamingos.
UNESCO has registered the lake as a Biosphere Reserve and it is listed as a wetland of international importance under the 1971 Ramsar Convention.
Iran's Lake Orumieh turns red
The "red tide" is actually the result of an algal bloom, an event in which marine or fresh water algae accumulate rapidly in the water.
The Lake Orumieh in Iran's West Azarbaijan province has turned red as the result of an environmental phenomenon known as the "red tide."
Soap-like foam substance produced by algae started to redden Orumieh from the East Azarbaijan coast and gradually covered the whole lake.
The "red tide" is actually the result of an algal bloom, an event in which marine or fresh water algae accumulate rapidly in the water.
The effect of excessive algae on fish can be lethal. It produces oxygen radicals which can damage fish gills, possibly leading to suffocation.
Some environmentalists say the phenomenon is caused by nutrient loading from human activities or industrial and city wastewater which include nitrates and phosphates.
Other experts, however, say the algae cannot survive in the salty water of the Lake Urmia and a possible change in the salt compounds might have caused the incident.
“When the salinity reaches the point of oversaturation, the salt compounds change,” environmentalist Masoud Baqerzadeh-Karimi told Mehr News Agency.
“The change causes some types of salts, especially those with sodium compounds and white crystals, settle down and those with magnesium and orange crystals remain in the water,” he added.
Baqerzadeh-Karimi rejected the role of wastewater in the phenomenon, saying that in that case “the lake should have turned red many years ago.”
Head of West Azarbaijan environment department Hassan Abbasnejad believes a type of algae is responsible for the incident.
“Dunaliella Salina is a type of algae that creates a red substance in order to adapt to salty environments and survive,” he explained.
The world's second largest salt water lake on earth, the Lake Urmia has faced a lot of environmental problems during the last few years.
Experts have warned that ecological factors and human activity will lead to the drying up of Lake Urmia in the near future.
The maximum depth of the lake has fallen from 12 to six meters and salt levels have reached 340 grams per liter, way above the standard level of 180 to 220 grams per liter.
The water body and its surroundings are home to some 212 species of birds, 41 reptiles, 7 amphibians, and 27 mammals, including the Iranian yellow deer.
It is considered to be one of the largest natural habitats for the tiny Artemia, which serves as a food source for migratory birds, such as flamingos.
UNESCO has registered the lake as a Biosphere Reserve and it is listed as a wetland of international importance under the 1971 Ramsar Convention.
Friday, August 13, 2010
Grand Lake, Ohio - Update
Sand to be used as a silica source in Grand Lake, Ohio
| Marysville company to begin Grand Lake project |
| Written by NANCY ALLEN, Celina Daily Standard |
| Wednesday, 11 August 2010 19:39 |
GRAND LAKE — A Marysville-based company will conduct a test this month in a 21 D2-acre part of Grand Lake to see if a beneficial algae species can be encouraged to grow and replace the toxic blue-green algae now dominant. Ross Youngs, CEO of Algaeventure Systems Inc., explained the test during Saturday’s meeting of the nonprofit Lake Improvement Association (LIA). The test site will be between the Celina Rotary lighthouse and a rock jetty. The process, called species flipping, is one of the solutions to help restore the lake Gov. Strickland and state leaders announced during a local news conference July 30. The test will involve adding silica (sand) to the lake to encourage the growth of diatom algae that need silica to make their glass cell walls. |
In nature sand is the source of silica for diatoms.
however merely putting sand will not be useful, a small bloom of Diatoms will take place but this is unpredictable.
Diatoms require very fine particles of silica, that can enter through the pores in their shells.
That is why dissolved silica or nano silica is required.
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