Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

In Computer Models and Seafloor Observations, Researchers See Potential for Significant 2008 "Red Tide" Season

29.04.2008
Conditions are ripe for another large bloom in New England waters; weather and ocean conditions will determine outcome

The end of April usually brings the first signs of harmful algae in New England waters, and this year, researchers participating in the Gulf of Maine Toxicity (GOMTOX) study—led by Woods Hole Oceanographic Institution (WHOI)--are preparing for a potentially big bloom.

A combination of abundant beds of algal seeds and excess winter precipitation have set the stage for a harmful algal bloom similar to the historic “red tide” of 2005, according to WHOI biologist Don Anderson, principal investigator of the GOMTOX program. The 2005 bloom shut down shellfish beds from the Bay of Fundy to Martha’s Vineyard for several months and caused an estimated $50 million in losses to the Massachusetts shellfish industry alone.

Weather patterns and ocean conditions over the next few months will determine whether this year’s algal growth approaches the troubles of 2005.

Oceanographers Dennis McGillicuddy (WHOI) and Ruoying He (North Carolina State University) are several years along in the development of a computer model to predict the intensity and location of blooms of the toxic algae Alexandrium fundyense in the Gulf of Maine.

Though the scientists are reluctant to make an official “forecast” (because bloom outcomes are dependent on weather events that cannot be predicted months in advance), colleagues in coastal management and fisheries believe that even rough seasonal forecasting can be useful in preparing for contingencies.

"With advance warning of a potentially troublesome year for algae, shellfish farmers and fishermen might shift the timing of their harvest or postpone plans for expansion of aquaculture beds,” said Anderson, a WHOI senior scientist in the Biology Department and director of the Coastal Ocean Institute.

“Restaurants might make contingency plans for supplies of seafood during the summer," Anderson added, "and state agencies can ensure they have adequate staff for the significant monitoring efforts that might be required to protect public health and the shellfish industry.”

Seeds or “cysts” of A. fundyense naturally germinate and turn into cells that swim up from the seafloor around April 1 of each year. By the end of April, cells usually begin to appear in large numbers in the waters off coastal Maine.

The algae are notorious for producing a toxin that accumulates in clams, mussels, and other shellfish and can cause paralytic shellfish poisoning (PSP) in humans who consume them.

According to a seafloor survey conducted in the fall of 2007 by Anderson’s team, the number of Alexandrium cysts—the dormant, seed-like stage of the algae’s life-cycle—is more than 30 percent higher than what was observed in the sediments prior to the historic bloom of 2005.

The seed beds were especially rich in mid-coast Maine, origin of many of the cells that affect western Maine, New Hampshire, and Massachusetts.

Other environmental factors then determine the extent to which the blooms spread down the New England coast. Much of the Northeastern United States was hit with record- or above-average rain and snowfall this winter, which will likely provide a larger than normal pulse of fresh water and nutrients into coastal waters this spring. The blend of nutrients and fresh water into salty sea water can improve growing conditions for algae.

"Our hypothesis is that cyst abundance is an indicator of the magnitude of the bloom,” said McGillicuddy, a senior scientist in the WHOI Department of Applied Ocean Physics and Engineering. “If there is a large bloom offshore, then wind patterns and ocean currents in the next few weeks will determine whether it will be transported onshore and have an effect on coastal shellfish resources.”

The research team has run its computer model through four scenarios, using the predominant wind patterns and ocean conditions from each year since 2004. Toxicity levels during those years have ranged from relatively low in 2004 and 2007 to extremely high levels in 2005 and 2006.

Coastal exposure to the blooms is worst for scenarios in which the spring weather was dominated by strong northeast winds, which tend to drive Alexandrium cells toward the southern New England coast. When southwesterlies dominated, the algae tend to stay offshore. Even when there are a lot of cells and toxicity, the effect can be confined to offshore waters.

Anderson, McGillicuddy, and other members of the GOMTOX team regularly share their data-driven models and field observations with more than 80 coastal resource and fisheries managers in six states and at the National Oceanic and Atmospheric Administration (NOAA), the Environmental Protection Agency, and the Food and Drug Administration (which oversees food safety).

"The models are very important when we consider the big picture of what a season might look like,” said Darcie Couture, director of Biotoxin Monitoring for the Maine Department of Marine Resources. “We used to feel like we were operating in the dark, without any awareness of what a season might bring."

"Now we have a bit of an advance warning that we can blend with our local knowledge and intuition about the shellfishing industry," Couture added. "Everyone appreciates more information, as it gives the fishermen and state officials a chance to decide if or how to prepare for the season."

McGillicuddy and more than a dozen students, technicians, and biologists will depart from Woods Hole, Mass., on April 28 on the research vessel Oceanus on the first of four expeditions to take stock of this year’s bloom and to study the causes of several recent blooms in the historically fertile fishing grounds around Georges Bank.

Biologists and oceanographers were surprised by the substantial scale and persistence of Alexandrium blooms observed on Georges Bank last year.

The research into blooms of the harmful algae Alexandrium is supported by NOAA’s Center for Sponsored Coastal Ocean Research, and the National Institutes of Health and the National Science Foundation (through the Woods Hole Center for Oceans and Human Health). Additional work examining other species of toxic algae in the Gulf and on Georges Bank is supported by the NOAA Oceans and Human Health Initiative (OHHI).

The Woods Hole Oceanographic Institution is a private, independent organization in Falmouth, Mass., dedicated to marine research, engineering, and higher education. Established in 1930 on a recommendation from the National Academy of Sciences, its primary mission is to understand the oceans and their interaction with the Earth as a whole, and to communicate a basic understanding of the oceans’ role in the changing global environment.

Mike Carlowicz | EurekAlert!
Further information:
http://www.whoi.edu

More articles from Ecology, The Environment and Conservation:

nachricht Loss of habitat causes double damage to species richness
02.04.2019 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig

nachricht Deep decarbonization of industry is possible with innovations
25.03.2019 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Full speed ahead for SmartEEs at Automotive Interiors Expo 2019

Flexible, organic and printed electronics conquer everyday life. The forecasts for growth promise increasing markets and opportunities for the industry. In Europe, top institutions and companies are engaged in research and further development of these technologies for tomorrow's markets and applications. However, access by SMEs is difficult. The European project SmartEEs - Smart Emerging Electronics Servicing works on the establishment of a European innovation network, which supports both the access to competences as well as the support of the enterprises with the assumption of innovations and the progress up to the commercialization.

It surrounds us and almost unconsciously accompanies us through everyday life - printed electronics. It starts with smart labels or RFID tags in clothing, we...

Im Focus: Energy-saving new LED phosphor

The human eye is particularly sensitive to green, but less sensitive to blue and red. Chemists led by Hubert Huppertz at the University of Innsbruck have now developed a new red phosphor whose light is well perceived by the eye. This increases the light yield of white LEDs by around one sixth, which can significantly improve the energy efficiency of lighting systems.

Light emitting diodes or LEDs are only able to produce light of a certain colour. However, white light can be created using different colour mixing processes.

Im Focus: Quantum gas turns supersolid

Researchers led by Francesca Ferlaino from the University of Innsbruck and the Austrian Academy of Sciences report in Physical Review X on the observation of supersolid behavior in dipolar quantum gases of erbium and dysprosium. In the dysprosium gas these properties are unprecedentedly long-lived. This sets the stage for future investigations into the nature of this exotic phase of matter.

Supersolidity is a paradoxical state where the matter is both crystallized and superfluid. Predicted 50 years ago, such a counter-intuitive phase, featuring...

Im Focus: Explosion on Jupiter-sized star 10 times more powerful than ever seen on our sun

A stellar flare 10 times more powerful than anything seen on our sun has burst from an ultracool star almost the same size as Jupiter

  • Coolest and smallest star to produce a superflare found
  • Star is a tenth of the radius of our Sun
  • Researchers led by University of Warwick could only see...

Im Focus: Quantum simulation more stable than expected

A localization phenomenon boosts the accuracy of solving quantum many-body problems with quantum computers which are otherwise challenging for conventional computers. This brings such digital quantum simulation within reach on quantum devices available today.

Quantum computers promise to solve certain computational problems exponentially faster than any classical machine. “A particularly promising application is the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Revered mathematicians and computer scientists converge with 200 young researchers in Heidelberg!

17.04.2019 | Event News

First dust conference in the Central Asian part of the earth’s dust belt

15.04.2019 | Event News

Fraunhofer FHR at the IEEE Radar Conference 2019 in Boston, USA

09.04.2019 | Event News

 
Latest News

High-efficiency thermoelectric materials: New insights into tin selenide

25.04.2019 | Materials Sciences

Salish seafloor mapping identifies earthquake and tsunami risks

25.04.2019 | Earth Sciences

Using DNA templates to harness the sun's energy

25.04.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>