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Floating dock from Japan carries potential invasive species
Date:6/7/2012

Coos Bay along the southern Oregon coast. Known as Didemnum vexillum, the tunicate is on the state's most dangerous species list and is both an ecological and economic threat because of its ability to spread and choke out native marine communities, according to OSU's Sam Chan, who chairs the Oregon Invasive Species Council.

It is difficult to assess how much of a threat the organisms on the newly arrived float may present, the researchers say. As future debris arrives, it may carry additional species, they point out. However, this dock may be unique in that it represents debris that has been submerged in Japan and had a well-developed subtidal community. This may be relatively rare, given the amount of debris that entered the ocean, the researchers say.

"Floating objects from near Sendai can drift around that coast for a while before getting into the Kuroshio current and then getting transported to the eastern Pacific," Chapman said. The researchers hope to secure funding to go to Japan and sample similar floats and compare the biological life on them with that on the transoceanic dock.

The scientists say the arrival of the dock is also a sobering reminder of the tragedy that occurred last year, which cost thousands of lives.

"We have to remember that this dock, and the organisms that arrived on it, are here as a result of a great human tragedy," Miller said. "We respect that and have profound sympathy for those who have suffered, and are still suffering."


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Contact: John Chapman
541-867-0235
Oregon State University
Source:Eurekalert

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