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Invasive Species From Japan Ride Tsunami Debris To U.S. Shore

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    Message 1 of 2 , Jun 10, 2012
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      By Jeff Barnard
      Associated Press
      June 9, 2012


      Original Link <http://apnews.myway.com/article/20120609/D9V9RA7O2.html>

      When a floating dock the size of a boxcar washed up on a sandy beach in
      Oregon, beachcombers got excited because it was the largest piece of
      debris from last year's tsunami in Japan to show up on the West Coast.

      But scientists worried it represented a whole new way for invasive
      species of seaweed, crabs and other marine organisms to break the
      earth's natural barriers and further muck up the West Coast's marine
      environments. And more invasive species could be hitching rides on
      tsunami debris expected to arrive in the weeks and months to come.

      "We know extinctions occur with invasions," said John Chapman, assistant
      professor of fisheries and invasive species specialist at Oregon State
      University's Hatfield Marine Science Center. "This is like arrows shot
      into the dark. Some of them could hit a mark."

      Though the global economy has accelerated the process in recent decades
      by the sheer volume of ships, most from Asia, entering West Coast ports,
      the marine invasion has been in full swing since 1869, when the
      transcontinental railroad brought the first shipment of East Coast
      oysters packed in seaweed and mud to San Francisco, said Andrew Cohen,
      director of the Center for Research on Aquatic Bioinvasions in Richmond,
      Calif. For nearly a century before then, ships sailing up the coast
      carried barnacles and seaweeds.

      Now, hotspots like San Francisco Bay amount to a "global zoo" of
      invasive species and perhaps 500 plants and animals from foreign shores
      have established in U.S. marine waters, said James Carlton, professor of
      marine sciences at Williams College. They come mostly from ship hulls
      and the water ships take on as ballast, but also get dumped into bays
      from home aquariums.

      The costs quickly mount into the untold billions of dollars. Mitten
      crabs from China eat baby Dungeness crabs that are one of the region's
      top commercial fisheries. Spartina, a ropey seaweed from Europe, chokes
      commercial oyster beds. Shellfish plug the cooling water intakes of
      power plants. Kelps and tiny shrimp-like creatures change the food web
      that fish, marine mammals and even humans depend on.

      A 2004 study in the scientific journal Ecological Economics estimated
      400 threatened and endangered species in the U.S. are facing extinction
      because of pressures from invasive species.

      It is too early for scientists to know how much Japanese tsunami debris
      may add to the invasive species already here.

      "It may only introduce one thing," said Cohen of the Aquatic
      Bioinvasions research center. "But if that thing turns out to be a big
      problem, we would rather it not happen. There could be an economic
      impact, an ecological impact, or even a human health impact."

      The dock, torn loose from a fishing port on the northern tip of Japan,
      was covered with 1.5 tons of seaweed, mussels, barnacles and even a few
      starfish. Volunteers scraped it all off, buried it above the high water
      line, and sterilized the top and sides of the dock with torches.

      But there was no telling whether they might already have released spores
      or larvae that could establish a foothold in a bay or estuary as it
      floated along the coast, said Carlton.

      "That's the 'Johnny Clamseed' approach," he said, referring to Johnny
      Appleseed, the pioneer apple tree planter of the early 19th century.
      "While that is theoretical, we don't actually know if that kind of thing

      One thing they know is that the bigger the debris, the more likely it
      has something on it.

      Chapman estimated there were hundreds of millions of individual living
      organisms on the dock when it washed up on Agate Beach outside Newport, Ore.

      But even a small plastic float that washed up on a beach in Alaska
      carried a live oyster, said Mandy Lindeberg, research scientist at the
      NOAA Fisheries Auke Bay Laboratories in Juneau, Alaska.

      The smaller bits of plastic expected to make up most of the tsunami
      debris won't have anything except species they picked up at sea, said

      On the dock, about half the plant species already exist on the West
      Coast, said Gayle Hansen, a research marine taxonomist at Oregon State
      University, who has spent hours with her eye scrunched up against a
      microscope examining samples from the dock.

      Among the exotic seaweeds was one known as wakame, which has become a
      nuisance around the world, but is not yet found in Oregon, she said.

      Whether hitchhiking species will survive here depends on randomness, she
      said. Seaweeds probably would not have survived to reproduce in the
      crashing surf at Agate Beach. It's the wrong kind of environment. But if
      they had floated into Yaquina Bay, very similar to their home waters in
      Japan, they could grow and reproduce.

      Lindeberg said, "The only defense for invasive species is early
      detection. Just like cancer."

      While monitoring is relatively cheap, say $30,000 to watch nearby waters
      for species from the dock, trying to stop an established invasion is
      expensive. California spent $7 million trying to eradicate a seaweed,
      she said.

      She said she hoped there would be funding for monitoring tsunami
      invasive species.

      James Morris, a marine ecologist and invasive species specialist at the
      NOAA National Centers for Coastal Ocean Science, in Beaufort, N.C., said
      the idea a natural disaster like the tsunami could introduce a new
      avenue for invasive species is intriguing.

      "It goes to show you that when it comes to invasive species, there are
      some things you can work to regulate and control," he said. "And there
      are issues like this that come up that open up a whole different realm
      of possibilities."



      .Japanese 03/11/11 Earthquake-Tsunami Resource Page


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