FRIDAY, April 13 (HealthDay News) — A moderate “red tide” is
expected in New England this spring and summer that could force the
closing of shellfish beds, according to experts.
A red tide is a type of harmful algae bloom. The algae in the water
don’t pose a direct threat to people, but toxins produced by the algae can
accumulate in mussels and clams and cause paralytic shellfish poisoning in
people who eat them.
The U.S. National Oceanic and Atmospheric Administration-funded
scientists used a new computer model to forecast the 2012 outlook for the
Gulf of Maine and concluded that a moderate red tide could cause the
closure of shellfish beds along 126 to 250 miles of coastline.
The prediction is based on the quantity of the algae Alexandrium
fundyense in its dormant (cyst) state detected in gulf sediments last
fall. This information was combined with computer simulations of weather
and ocean conditions — winds, sunlight, rainfall, tides and currents —
that influence the size of the bloom.
The scientists noted that many factors — such as water characteristics
and wind direction — could affect their forecast.
“The surveys of cyst abundance gives us an indication of the potential
extent of the bloom, but whether or not that potential is realized depends
on the growing conditions,” Dennis McGillicuddy, senior scientist in
applied ocean physics and engineering at Woods Hole Oceanographic
Institution, said in an institution news release.
“In 2010, we forecast a large bloom but we got it wrong. That spring,
an unusual mass of warm, fresh water that was low in nutrients changed the
growing conditions,” he noted.
“Each year, we add another set of environmental conditions to our
archive of model runs. In the future, a winter that is warmer and drier
than normal can be represented by 2012, but right now, we have no similar
year in that archive,” Don Anderson, senior scientist in biology at Woods
Hole, said in the news release.
More information
The Massachusetts Department of Health and Human Services has more
about red tide.
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