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Images related to the MBARI News Release
Researchers discover source of essential nutrients for mid-ocean algae

Note: These images may not be copied, reprinted, or used without explicit permission from MBARI or from the photographers. Members of the media needing higher-resolution versions should contact Kim Fulton-Bennett, kfb@mbari.org, 831-775-1835.

Apex float in MBARI test tank
Image credit: Todd Walsh © 2007 MBARI

Ken Johnson and his fellow researchers work on the Apex float equipped with an ISUS in the MBARI test tank. From left to right, the researchers are: Ken Johnson (MBARI), Stephen Riser (University of Washington), Luke Coletti (MBARI), and Hans Jannasch (MBARI).


Apex float in MBARI test tank
Image credit: Todd Walsh © 2007 MBARI

Researchers observe the Apex float equipped with an ISUS in the MBARI test tank.


Ken Jonnson with Apex float in Monterey Bay
Image credit: Hans Jannasch © 2007 MBARI

MBARI marine chemist Ken Johnson (on right) and a crew member of the R/V Doc Martin (on left) transport the Apex float equipped with an ISUS sensor out for a test dive in Monterey Bay.


Luke Coletti with Apex float in Monterey Bay
Image credit: Ken Johnson © 2007 MBARI

MBARI Senior Research Technician Luke Coletti prepares the Apex float equipped with an ISUS sensor for a test dive in Monterey Bay.


Hans Jannasch with Apex float in Monterey Bay
Image credit: Ken Johnson © 2007 MBARI

MBARI Senior Research Specialist Hans Jannasch (on left) and a crew member of the R/V Doc Martin (on right) prepare to lower an Apex float equipped with an ISUS sensor into the waters of Monterey Bay.


Deploying Apex float off Hawaii
Image credit: © 2007 Paul Lethaby/SOEST

A researcher from the University of Hawaii prepares to release the Apex float with its integrated ISUS nitrate sensor into the clear, mid-ocean waters northeast of Oahu.


Illustration of Apex float, sunlight, nitrate, and marine algae
Image credit: Kim Fulton-Bennett © 2010 MBARI

This illustration shows how microscopic algae live mostly in the sunlit waters close to the sea surface, while their essential nutrient, nitrate, is only available in deeper waters. Johnson and his coauthors showed that, each year, as the algae grow over the course of a year, concentrations of oxygen increase in surface waters while concentrations of nitrate decrease in deeper water. As yet unclear is how algae near the surface obtain nitrate from the depths.


Last updated: Jun. 23, 2010