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UW-built device reveals invisible world teeming with microscopic algae
Date:10/6/2010

It just got easier to pinpoint biological hot spots in the world's oceans where some inhabitants are smaller than, well, a pinpoint.

Microscopic algae are called phytoplankton and range from one to hundreds of microns in size the smallest being 1/100th the size of a human hair. But as tiny as they may be, communities of the phytoplankton south of Vancouver Island, British Columbia, are big players when it comes to carbon: They take up 50 percent of the carbon dioxide going from the atmosphere into the oceans there.

"We thought that had to be a mistake at first," says Francois Ribalet, a UW post-doctoral researcher in oceanography and lead author of a Proceedings of the National Academy of Sciences paper on the discovery published online in September.

"They are such small cells to do so much," he says.

Phytoplankton, like plants on land, take up carbon from carbon dioxide during photosynthesis to build cells. Phytoplankton anchor the oceanic food web so where one finds a lot of phytoplankton, one usually finds a healthy collection of fish and animals. If not eaten, phytoplankton die and sink, carrying their carbon with them. Worldwide, ocean phytoplankton consume as much carbon dioxide as the Earth's forests and land plants combined.

"Being able to readily detect and track blooms of these small-celled phytoplankton is critical for understanding their impact in the oceans and global carbon cycle," Ribalet says.

SeaFlow, a device being developed at the UW, is making that task easier, he says. The instrument is a flow cytometer that measures the size and pigment composition of each single phytoplankton present in a sample at a rate of thousands of cells per second.

Typically biologists with traditional cytometers looked for phytoplankton using tablespoon-sized samples of water collected 10 to 50 miles or more from each other.

SeaFlow can sample seawater continuously making it possible to analyze samples every
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Contact: Sandra Hines
shines@uw.edu
206-543-2580
University of Washington
Source:Eurekalert  

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