posted 08-18-2002 08:51 AM
Re:Crabs, Fish Die Without Oxygen
In Oregon Coastal Waters
8-1-2
Yes, I did read this, thank you! I'm sure you probably know about similar situations off the coast of Monterey, CA, off the coast of Florida in the Gulf of Mexico and in the Southern Ocean off Antarctica.
For general consideration:
8 May 2002
Search is on for killer plankton
Puzzling sea life malady http://www.sfgate.com/cgi-bin/article.cgi?f=/chronicle/archive/2002/05/08/BA21 4448.DTL&type=news
Marine scientists are carefully sampling the waters off Monterey this week for signs that a mysterious species of plankton could suddenly bloom and begin poisoning marine mammals, fish, sea birds -- and possibly humans.
Hundreds of California sea lions, common dolphins and other marine mammals and sea birds have become ill or died on the southern and central California coast during the past two months.
In recent days, at least one northern fur seal was discovered stranded and ill in the Monterey Bay area, suggesting that a plankton bloom there has already become toxic enough to sicken animals, scientists believe.
The culprit is a diatom of the genus ***Pseudo-nitzschi, a microscopic single- celled plant that under certain conditions can produce _domoic acid_, a deadly nerve toxin.***
Recognizing the danger, the California Department of Health Services has issued several warnings to avoid eating all sport-harvested species of bivalve shellfish. The quarantine area is in effect for the entire California coast, including bays and estuaries. A separate health advisory for the San Luis Obispo coast warns people to avoid eating the dark-colored organs of anchovies, sardines and crab..... [more]
University of Southern California
Raphael M. Kudela, Asst. Prof.
Ocean Sciences Dept. http://people.ucsc.edu/~kudela/
Excerpt:
ECOHAB: Within the Monterey Bay region, there are several funded groups working closely together on the ***Pseudo-nitzschia/domoic acid complex.*** We (myself and William Cochlan, SFSU) are funded to develop in the field and laboratory an understanding of how Si, N, C, and light interact physiologically to trigger domoic acid production. Colleagues at MBARI (C. Scholin), UCSC (D. Garrison, M. Silver, J. Goldman, E. Rue), U. Maine (M. Wells), and MLML (G.J. Smith) are working on related aspects, ranging from the role of metal availability, ***including iron,*** to the transfer of toxin through the marine food web.
END of excerpt.
The Harrison Lab http://www.ocgy.ubc.ca/~pjhlab/marchetti.html
Physiological aspects of Fe nutrition and toxin production by oceanic and coastal diatoms of the genus Pseudo-nitzschia
Adrian Marchetti, Ph.D. candidate
Outline of proposed research
Excerpts:
.....Iron concentrations within vast regions of our world’s oceans have been proven to limit the growth of primary producers. ***Recent evidence has shown that iron fertilization in these areas has resulted in increased productivity and algal blooms (Martin et al. 1994 Nature 371; Coale et al. 1996 Nature 379; Boyd et al. 2000 Nature 407).***
*** As phytoplankton transport a large amount of carbon to the ocean depths it has been suggested that large scale open ocean Fe fertilization could be a possible solution in combating a recent increase in atmospheric carbon dioxide. Given the dramatic success of mesoscale Fe enrichment experiments in the Equatorial Pacific and the Southern Ocean, further Fe fertilization experiments are planned. Alleviation of Fe stress in these Fe-limited communities results in a phytoplankton species composition shift where larger diatoms become dominant. In particular, in the Northeast Pacific, the pennate [DOMOIC ACID-PRODUCING] diatom Pseudo-nitzschia spp. becomes the dominant group, comprising more than 80% of primary producer biomass (Boyd et al. 1996 MEPS 136).***
Over the last decade, toxin monitoring programs have been established along the coasts of Canada and the United States. One toxin, domoic acid, produced by certain Pseudo-nitzschia spp. has been well studied since outbreaks have occurred both on the east and west coasts of North America. A domoic acid monitoring program coordinated by Dr. Vera Trainer of the National Marine Fisheries Service (Seattle, Washington) has identified a potential “hotspot” for consistent and relatively high concentrations of domoic acid within the Tully Eddy off the mouth of the Juan de Fuca Strait. In this respect, the Tully Eddy may produce a seed population of Pseudo-nitzschia spp. that may fuel blooms of this diatom and domoic acid production along the west coast of Vancouver Island and Washington State (Vera Trainer, pers. comm.). By studying coastal areas prone to high concentrations of domoic acid, we may ascertain the conditions that promote the production of this toxin.....
.....Significance: ***In July of 2002, a large-scale Fe fertilization experiment (part of the Canadian SOLAS project) will take place at OSP. The intent of my research is to assist in the understanding and possible ramifications of these large-scale Fe fertilization projects by focusing on the ecophysiology of the induced dominant member of the phytoplankton community, Pseudo-nitzschia spp.***
Outbreaks of domoic acid have resulted in millions of dollars in marine harvest losses (eg. Razor clams) as well as mortalities of marine mammals, birds and even humans. By studying physical and biological parameters of regions associated with high levels of this toxin, a better understanding of what conditions facilitate domoic acid production may be achieved......
END of excerpts.
24 March 2002
Scripps Howard News Service
Massive 'dead zone' fouls gulf off Florida http://seattlepi.nwsource.com/national/63144_deadzone21.shtml
NAPLES, Fla. -- Commercial fishermen along the Southwest Florida coast are reporting a massive dead zone that is almost devoid of marine life in an area of the Gulf of Mexico traditionally known as a rich fishing ground.
They've dubbed it "black water," and they're demanding that local, state and national government agencies find out what's causing it.
Scientists who have heard of the phenomenon say they, too, need answers.
"It's killed a lot of the bottom because recently a lot of little bottom plants are coming to the surface dead and rotten," said Tim Daniels, 58, a Marathon Key fish-spotting pilot who has been flying over the Gulf for more than 20 years.
Like Daniels, fishermen with decades on the water say they've often seen red tide but they've never seen anything like this -- it doesn't have a foul smell, it isn't red tide and it isn't oil. They describe it as viscous and slimy water with what looks like spider webs in it.
First sighted in January, the mass of black-colored water reached from 20 miles north of Marathon Key halfway to Naples. It stretched west almost 20 miles into the Gulf of Mexico. Fishermen don't know if it's moved in from the north or offshore or if it originated in the coastal waters off Southwest Florida.
Though somewhat smaller now than descriptions from January, the mass of water is moving into the Florida Keys National Marine Sanctuary. Created by Congress in 1990, the 2,800-square-mile sanctuary adjacent to the Keys is the largest coral reef in the United States.
It includes the productive waters of Florida Bay, the Gulf of Mexico and the Atlantic Ocean..... [more]
Ocean Iron Fertilization @ MIT http://web.mit.edu/jadhiya/www/textframe.htm
Markels Jr. M and Barber R.T. (2000) The sequestration of carbon to the deep ocean by fertilization. ACS Symposium on CO2 Capture, Utilization, and Sequestration. August 20-24, 2000.
[Proposes a demonstration experiment over 13000 sq. km in the Equatorial Pacific, and contains a discussion of never-published results of privately-funded field tests in the ***Gulf of Mexico.*** Claims costs of $1-2/ton of CO2 captured. References are included for issed patents and the pending "iron chelate " patent application. See also, the company’s website: (http://www.greenseaventure.com)]
November 2000
Wired 8.11 -- Dumping Iron http://www.wired.com/wired/archive/8.11/ecohacking_pr.html
Excerpt:
.....OFI headquarters consists of a dignified cubicle in the back hall of the Versar complex. There's a paneled desk set surrounded by diplomas and honor society plaques, a view of the parking lot, and a large rectangular whiteboard. And on this board, in erasable blue marker beneath his beloved Mae West quote, is a series of statements arranged like a proof to a mathematical theorem. Markels reads top to bottom, his voice booming with moral authority:
EVERYTHING IS CONNECTED
EVERYTHING IS UNCERTAIN
ANYTHING MIGHT CAUSE ANYTHING
DON'T DO ANYTHING ...
SOMETHING HAS TO BE DONE!
This logic poem figures prominently for Markels - in the course of our interview he refers to it almost a dozen times. It encapsulates his gripes about the current state of the global warming debate: The problem is too complex to tinker with, and yet too serious to ignore; the only answer is to study it until it's too late.
"I have a friend in the Office of Science at the Department of Energy," Markels says. "I said to him, 'It looks to me like you don't want to solve the problem.' You know what he told me? He said, 'No, absolutely not! We want to study it! If we solve the problem, then everybody'll be out of a job!'" Markels leans forward and grins broadly. "Nobody wants to fix it!" he says. "Nobody."
Nobody, he means, except himself, the man who developed IronEx research into a patented system. The primary issue was efficiency. Markels says that as much as 95 percent of the iron that IronEx II dissolved in solution and then dumped into the ocean oxidized immediately and sank to the bottom, useless for photosynthesizing plankton. To prevent this waste, Markels began looking for a chelate - a molecular ring that protects iron from oxidation just as a shark cage protects a skin diver. The most obvious choice was editic acid (EDTA), a pharmaceutical compound commonly used in vitamin pills. But EDTA is expensive. Markels needed a chelate that's affordable by the ton.
"I took a look at lignic acid," he says. "It's a by-product of the papermaking process - they used to dump it in streams. It turned the water brown, it stank, it killed the fish. I gave it a try. Turns out it works much better than EDTA. And it's cheap!"
Markels stands stiffly and reaches between the chemistry handbooks and company reports on his bookshelf to procure a baggie of gray bullets - shiny june bug-sized pellets of compressed iron dust, fortified with lignic acid chelate. He places a few magic beans in my palm. ***"We tested these in the Gulf of Mexico,*** and they work fine," he says, adding that the acid will be too diluted in seawater to cause pollution problems.....
19 March 2002
Depths of the Southern Ocean being starved of oxygen http://unisci.com/stories/20021/0319022.htm
Excerpt:
.....The depths of the Southern Ocean are slowly being starved of oxygen, Australian climate scientists have found.
"Our climate simulations predict a decrease in oxygen at depths of 500 to 2500 meters in the Southern Ocean and from two research expeditions we now have observed changes in oxygen that support these predictions," says CSIRO's Dr. Richard Matear.
"The interpretation is that less oxygen-rich water is penetrating into the ocean and this in turn gives additional credibility to climate change models. The oxygen analysis provides a new benchmark of understanding for researchers.".....
END of excerpt.
12 October 2000
Iron Fertilization in Southern Ocean Increased Growth of Algae that Absorb Greenhouse Gases, and Could Cool Climate http://www.whoi.edu/media/iron.html
Scientists who fertilized a small patch of the Southern Ocean near Antarctica in 1999 to determine if the iron would stimulate growth of algae that consume carbon dioxide, a major greenhouse gas, say their results show that iron supply does control algal growth during the summer but that the long-term fate of the carbon remains unknown.
The results of the 1999 experiment were reported in today's issue of the journal Nature. Woods Hole Oceanographic Institution scientists Ken O. Buesseler and Matthew Charette, co-authors of the Nature study, say the results are important to our understanding of the ocean's role in carbon cycling. They also caution that the results of this study don't necessarily mean that adding iron in short bursts will lead to a decline of carbon from the surface ocean, and note that a major unanswered question is the fate of the carbon in the ocean..... [more]
January/February 2002
Southern Ocean Iron Fertilzation Experiment [SOFEX] http://www.mbari.org/education/cruises/SOFeX2002/
Seven MBARI researchers left at the end of December for Christchurch, New Zealand, to embark on one of the largest, most complex research projects ever undertaken by the U.S. oceanographic fleet.
The Southern Ocean Iron Experiment (SOFeX) involves two of the largest ships in the UNOLS fleet, the R/V REVELLEand the R/V MELVILLE operated by the Scripps Institution of Oceanography. In addition, the U.S. Coast Guard Coast Guard Cutter POLAR STAR will participate in the experiment after leaving its duties at the Antarctic U.S. base on McMurdo Sound. The R/V REVELLE left New Zealand on Jan. 6, 2002 to be followed 15 days later by the R/V MELVILLE headed south towards the Antarctic continent. Both ships will be out for approximately six-week cruises concluding back in New Zealand. The POLAR STAR will be leaving McMurdo Sound around Feb. 12 and will berth in Hobart, Tasmania approximately four weeks later.
The SOFeX program involves 76 scientists from 17 different institutions. Dr. Ken Johnson (MBARI) is chief scientist on the R/V REVELLE, Dr. Kenneth Coale (MLML) on the R/V MELVILLE and Dr. Ken Buessler (WHOI) on the POLAR STAR.
The aim of the SOFeX project is to investigate the effects of iron fertilization on the productivity of the Southern Ocean. The results of this work will contribute significantly to our understanding of important biogeochemical processes which bear directly on the global carbon cycle, atmospheric carbon dioxide concentration, and climate control..... [more]
12 October 2001
Blooming Marvelous http://www.nature.com/nsu/001012/001012-10.html
Excerpt:
.....Yet the temptation to see these findings as support for the idea of offsetting the greenhouse effect with iron fertilization should be resisted. Says Sallie Chisholm of the Massachusetts Institute of Technology, "The oceans are a complex system, and it is impossible to predict the long-term consequences of commercial ocean fertilization."
Past experience teaches us that attempts to tweak the environment for a desirable result can have unexpected consequences, sometimes the reverse of what we want. "Large-scale mobilization of fertilizer… to the sea is likely to cause more problems than it solves," Chisholm warns.....
END of excerpt.
20 November 2001
New York Times
Plan calls for using oceans to soak up CO2; critics cite perils http://www.eos.ubc.ca/courses/eosc112/nytcarbon.html
Excerpt:
.....When carbon dioxide dissolves, it turns into carbonic acid, making the water more acidic. But biologists have observed that a change of 0.3 in the pH level in the blood of some deep sea creatures can halve the amount of oxygen. "It may not kill them," Dr. Seibel said, "but they may not be able to swim as actively as they could be before. It'd be like they were out of breath.".....
END of excerpt.
The Scientific and Policy Uncertainties Surrounding the Use of Ocean Fertilization to Transfer Atmospheric Carbon Dioxide to the Oceans
A summary statement drafted by participants in a workshop sponsored by the:
American Society of Limnology and Oceanography (ASLO)
April 25, 2001 Washington D.C. http://aslo.org/docs/ocnfert.html
Excerpt:
Carbon dioxide (CO2) is being emitted to the atmosphere in unprecedented amounts and the rate is accelerating. The control of this and other greenhouse gases must be made an international priority, and reducing anthropogenic emissions of CO2 is of primary importance. Additional mitigation measures may also be required, however, including carbon sequestration strategies. One of the strategies being considered involves adding iron, a plant nutrient, directly to surface seawater in key ocean areas to stimulate phytoplankton growth and use the ocean’s ‘biological pump’ to deliver carbon to the deep sea. This procedure may have the potential to sequester atmospheric CO2 for centuries.
ASLO invited an international group of experts from academia, industry and government agencies to discuss the scientific and legal issues surrounding intentional fertilization of the ocean. These issues included the limits to our understanding of the ocean carbon cycle, the potential for stimulating ocean productivity, the environmental risks of ocean fertilization, and the appropriate intersection of science, government and industry in the pursuit of this possible CO2 mitigation option. Although the group was not unanimous on all issues, the workshop generated the following findings and recommendations:
FINDING 1. Re: Carbon dioxide sequestration by ocean fertilization
On the basis of available scientific information, we cannot dismiss ocean fertilization with iron as a mitigation option. However, computer models predict that it would at the very best reduce the expected increase of atmospheric CO2 by a small percentage1. Achieving this degree of sequestration would entail major alterations of the ecosystem ¾ such as changes in food web structure and biogeochemical cycles ¾ as has been demonstrated in several research experiments to date. These changes will have unknown consequences, some of which will be inherently unpredictable.
There is commercial interest in small-scale fertilization experiments to better understand the ocean carbon cycle and to take advantage of anticipated carbon credits. Given the present state of knowledge and technology, it is premature to justify carbon credits for ocean fertilization.
For example:
-- There is no current capability to verify the amount and time scales of CO2 sequestration resulting from ocean fertilization.
-- It is difficult to assess biogeochemical and ecological consequences of fertilization in patches.2 Far-field, long-term and cumulative effects of nutrient applications must be described. This will require computer models validated through observations and process studies.
-- Fertilization will very likely result in increased marine emissions of atmospherically important substances, with unknown consequences. These emissions include the potent greenhouse gases nitrous oxide and methane, ***as well as dimethyl sulfide (which influences cloud formation)*** and halogenated compounds that are important for the oxidation (cleansing) capacity of the atmosphere.....
END of Excerpt
December 1996
Global Climate Change Digest
NEWS -- OCEAN FERTILIZATION
http://www.globalchange.org/gccd/gcc-digest/1996/d96dec11.htm
Spectacular results in a major ocean field experiment have oceanographers looking forward to follow-up experiments, and have renewed controversy over a geoengineering scheme. Last summer, in "IronEx II," iron was added to areas of the tropical Pacific Ocean, triggering a massive bloom of phytoplankton that removed CO2 from the air. The results confirm that lack of iron is a controlling factor in this part of the carbon cycle, and support the hypothesis that iron reaching the oceans in the form of windblown dust accounts for the reduced levels of CO2 during the ice ages that kept the planet cool. ***Stimulation of plankton also increased emissions of dimethyl sulfide (DMS), a gas which oxidizes in the atmosphere to form sulfate particles. These particles further contribute to cooling, by shielding the Earth from solar heating and by enhancing the formation of clouds.*** (See New Scientist, p. 4, Oct. 12, 1996; Chem. Eng. News, p. 10, Oct. 14; and papers in Prof. Pubs./Ocean Fertilization, this Global Climate Change Digest issue--Dec. 1996.)
-------------------------=>
Do I think it's possible that the above-described OIF studies ongoing in several parts of our oceans may be, at least in part, behind the incidences of dying marine life, "black water" or "dead zones" [domoic acid-facilitated] and "strange marine fog" [dimethyl sulfide-facilitated] being observed by people near the study areas?
Yes. I think it's possible. At the very least, I think it should be looked into.
Keywords can be drawn from the above material for further research. There's plenty of additional material available.
Thank you.
[Edited 2 times, lastly by Deborah on 08-24-2002]