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Variable Light Illuminates The Distribution Of Picophytoplankton

Date:
December 21, 2007
Source:
Public Library of Science
Summary:
Tiny photosynthetic plankton less than a millionth of a millimeter in diameter numerically dominate marine phytoplankton. Their photosynthesis uses light to drive carbon dioxide uptake, fueling the marine food web over vast areas of the oceans. A new study illuminates how the environment regulates the distributions of these ecologically important species.

Tiny photosynthetic plankton less than a millionth of a millimeter in diameter numerically dominate marine phytoplankton. Their photosynthesis uses light to drive carbon dioxide uptake, fueling the marine food web over vast areas of the oceans. A new study by post-doctoral researcher Dr Christophe Six and a team of scientists from MountAllison University, Sackville, New Brunswick, Canada, illuminates how the environment regulates the distributions of these ecologically important species.

Dr Doug Campbell, Canadian Research Chair in Environmental Processes and co-author explains, "Phytoplankton are entrained in the water column and are thus subject to rapid changes in light as they mix through the upper layer of the ocean."

Dr Christophe Six adds, "Phytoplankton need light for photosynthesis and survival, but surprisingly this light also inactivates a key component of the photosynthetic apparatus, photosystem II. This Photoinactivation of photosystem II decreases photosynthesis and can even kill cells, unless they can counteract the damage through repair, which requires nutrients."

"We found the picophytoplankton species isolated from different regions of the ocean have different abilities for this repair, and therefore have different abilities to tolerate increases in light. Their repair capacities are consistent with the different light and nutrient regimes in their local environments; species from deep ocean regions with stable light and low nutrients have very limited repair capacity, but species from coastal regions with more variable light and higher nutrients are more able to cope with variable light through rapid repair."

This result indicates that picophytoplankton species' tolerance of exposures to high light can help to explain how these organisms are distributed throughout the ocean. The group measures the rates of photoinactivation and the rates of the counteracting repair in a wide variety of phytoplankton species, and next plans to contribute to ocean models to predict phytoplankton carbon cycling in response to future climate change.

Citation: Six C, Finkel ZV, Irwin AJ, Campbell DA (2007) Light Variability Illuminates Niche-Partitioning among Marine Picocyanobacteria. PLoS One 2(12): e1341. doi:10.1371/journal.pone.0001341. http://www.plosone.org/doi/pone.0001341


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The above story is based on materials provided by Public Library of Science. Note: Materials may be edited for content and length.


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Public Library of Science. "Variable Light Illuminates The Distribution Of Picophytoplankton." ScienceDaily. ScienceDaily, 21 December 2007. <www.sciencedaily.com/releases/2007/12/071219082607.htm>.
Public Library of Science. (2007, December 21). Variable Light Illuminates The Distribution Of Picophytoplankton. ScienceDaily. Retrieved April 19, 2014 from www.sciencedaily.com/releases/2007/12/071219082607.htm
Public Library of Science. "Variable Light Illuminates The Distribution Of Picophytoplankton." ScienceDaily. www.sciencedaily.com/releases/2007/12/071219082607.htm (accessed April 19, 2014).

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