Navigation Links
New research finds ocean's most abundant organisms have clear daily cycles
Date:7/10/2014

Imagine the open ocean as a microbial megacity, teeming with life too small to be seen. In every drop of water, hundreds of types of bacteria can be found. Now scientists have discovered that communities of these ocean microbes have their own daily cyclesnot unlike the residents of a bustling city who tend to wake up, commute, work, and eat at the same times.

What's more, it's not all about the sun. Light-loving photoautotrophsbacteria that need solar energy to help them photosynthesize food from inorganic substanceshave been known to sun themselves on a regular schedule. But in a new study published in the July 11 issue of the journal Science, researchers working at Station ALOHA, a deep ocean study site 100 km north of Oahu, observed different species of free-living, heterotrophic bacteria turning on diel cycling genes at slightly different timessuggesting a wave of transcriptional activity that passes through the microbial community each day.

"I like to say they are singing in harmony," said Edward F. DeLong, professor of Oceanography at University of Hawaii at Manoa and the head of the Massachusetts Institute of Technology team that made this discovery.

"For any given species, the gene transcripts for specific metabolic pathways turn on at the same time each day, which suggests a sort of temporal compartmentalization," said DeLong, who was the first scientist to be hired by the University under the auspices of the Hawai'i Innovation Initiative. "It's a biologically and biogeochemically relevant new result."

The observations were made possible by advanced microbial community RNA sequencing techniques, which allow for whole-genome profiling of multiple species at once. The work was a collaboration between the Monterey Bay Aquarium Research Institute and DeLong's team, who together employed a free-drifting robotic Environmental Sample Processor (ESP) as part of a Center for Microbial Oceanography: Research and Education (C-MORE) research cruise at Station ALOHA. Riding the same ocean currents as the microbes it follows, the ESP is uniquely equipped to harvest the samples needed for this high-frequency, time-resolved analysis of microbial community dynamics.

What scientists saw was intriguing: different species of bacteria expressing different types of genes in different, but consistent, cyclesturning on, for example, the type of restorative genes needed to rebuild their solar-collecting powers at night, then ramping up with different gene activity to build new proteins during the day. "The regularity and timing of individual microbial activities is somewhat like a new shift of hourly workers punching in and out of the clock, day after day," DeLong said.

The coordinated timing of gene firing across different species of ocean microbes could have important implications for energy transformation in the sea. Marine microbes are critically linked to ocean health and productivity. The mechanisms that regulate this periodicity remain to be determined.

But can you set your watch to it? DeLong says you can, but it matters whether you're tracking the bacteria in the lab or out at sea. For example, maximal light levels at 23 meters depth at Station ALOHA were twice as high as light conditions that were previously used in experimental settings in the laboratorywhich may have an effect on microbe activity and daily cycles. That's part of why it's so important to conduct this research in the actual open ocean environment.

This study was funded in part by the National Science Foundation and by a grant from the Gordon and Betty Moore Foundation [Grant GBMF3777]. Separately, in 2013, the Moore Foundation's national Marine Microbiology Initiative awarded DeLong and UH Manoa professor David Karl $4.2 million to explore how the trillions of microscopic organisms at the base of the ocean's food webs interact with each other and the environment.

DeLong aims to continue his groundbreaking in situ ocean research with support from the Moore Foundation and as co-director of the new Simons Collaboration on Ocean Processes and Ecology (SCOPE), a five-year $40 million collaboration funded by the largest private gift in UH history.

"There are some fundamental laws to be learned about how organisms interact, to make the system work better as a whole and be more efficient," DeLong said. "At its base, that's one of the main things we're after in SCOPEthese fundamental principles that make ecosystems work. These findings have tremendous applications in all sorts of arenas."


'/>"/>

Contact: Talia S. Ogliore
togliore@hawaii.edu
808-956-4531
University of Hawaii at Manoa
Source:Eurekalert

Related biology news :

1. Scorpions are master architects, according to new research from Ben-Gurion University
2. BrightFocus Foundation announces 55 new grantees in Alzheimers and vision research
3. New research: Fresh avocado enhances absorption of essential nutrients for healthy living
4. Research reveals how key controller protein is switched on
5. Researchers declassify dinosaurs as being the great-great-grandparents of birds
6. New research unit for dangerous hospital germs
7. IPCC must consider alternate policy views, researchers say
8. Science and cookies: Researchers tap into citizen science to shed light on ant diversity
9. Researchers receive $12.6 million NIH grant to study genetics of Alzheimers
10. DFG to fund 5 new research units
11. Researchers uncover new knowledge about our intestines
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/30/2019)... ... September 30, 2019 , ... ... the capacity of life science organizations to accelerate innovation and maximize productivity, announces ... October 4th. , What: Just 30 days to 21 CFR Part 11 compliance ...
(Date:9/25/2019)... ... September 25, 2019 , ... Modality ... ranked No. 3094 on Inc. Magazine’s annual Inc. 5000 list, the most prestigious ... of 120 percent. Based on this growth, the Houston-based firm also ranked No. ...
(Date:9/24/2019)... SEATTLE (PRWEB) , ... September 24, 2019 , ... ... pharmaceutical companies characterize protein interactions for accelerated drug development, announced today that it ... round was led by OS Fund and also includes AME Cloud Ventures, Boom ...
Breaking Biology News(10 mins):
(Date:10/17/2019)... Conn. (PRWEB) , ... October 16, 2019 , ... ... that provides personalized, easy-to-understand, web-based genetic counseling information, has published a new white ... five year period and provides guidance as to how patients and medical providers ...
(Date:10/10/2019)... ... October 09, 2019 , ... ... MD, PhD, Principal Deputy Commissioner, FDA, as a newly-confirmed keynote speaker for the ... in Las Vegas, Nevada USA. , Dr. Abernethy, a hematologist/oncologist and palliative medicine ...
(Date:10/10/2019)... ... ... R3 Stem Cell announces it has added an exosome presentation to its upcoming ... spots still open. , The speaker, Dr. Ian White PhD, is a world renowned ... and Dartmouth. He currently serves as the Chief Scientific Officer at IMAC Regeneration Centers ...
(Date:10/8/2019)... , ... October 08, 2019 , ... ... (TMP), Madhumita Suresh and Leslie Maurer presented company executives with a set of ... Science (MBS) graduates will offer insights from their TMP to a wider audience ...
Breaking Biology Technology: