Corals may let certain bacteria get under its skin, according to a new study by researchers at Woods Hole Oceanographic Institution (WHOI) and King Abdullah University of Science and Technology (KAUST) and soon to be published in the journal Applied and Environmental Microbiology.
KAUST-based coral scientist Christian Voolstra gathered samples of the coral species Stylophora pistillata. Earlier sampling methods ground up and mixed together the coral’s surface, tissue, and skeletal layers to obtain genetic information, making it impossible to tell where exactly the genetic information came from. This time, Voolstra and the researchers used a microscopy-based technique and were able to determine that Endozoicomonas lives within the tissue layer. (Photo by Michael Berumen, Woods Hole Oceanographic Institution)
The study offers the first direct evidence that Stylophora pistillata, a species of reef-building coral found throughout the Indian and west Pacific Oceans, harbors bacterial denizens deep within its tissues.
“We have evidence that other species of coral also host these bacteria, and that they may play an important role in keeping a coral healthy,” says Amy Apprill, a WHOI assistant scientist who co-directed the study along with KAUST Assistant Professor Christian Voolstra. KAUST post-doctoral scholar Till Bayer was the lead author of the study.
Researchers have known for decades that most corals don’t like to live alone. Reef-building corals are known to have symbiotic, or mutually beneficial, relationships with single-celled algae. More recent evidence has suggested that bacteria, fungi, and viruses are also part of the mix—especially a group of bacteria called Endozoicomonas, which has been associated with a number of coral species around the world. But scientists haven’t been able to pinpoint where exactly Endozoicomonas lives—in the coral’s tissues or on its surface layer—or what it does there.
Through a research partnership between WHOI and KAUST in Saudi Arabia, Apprill and a diverse team of WHOI and KAUST researchers were able to gain access to the pristine coral reef colonies of the Red Sea. There, they used DNA-based techniques to uncover an abundance of Endozoicomonas genes associated with the coral Stylophora pistillata. The team then created a DNA “probe”—a fragment of DNA designed to fit into the bacterium’s genetic code like a missing puzzle piece—that would light up when it connected with Endozoicomonas genes. Guided by the probe’s fluorescence, the researchers were able to spot Endozoicomonas living deep within the coral’s tissue.
“These weren’t single cells—they were living together in a clump, like a bunch of grapes on a stem,” says Apprill. “That was pretty exciting, because we had not thought about them living like this before.”
Although Endozoicomonas bacteria had previously been linked to coral colonies throughout the world’s oceans, as well as to some species of sponges and sea slugs, this study is the first to directly show the bacteria living within any marine animal. Now, Apprill says, the real mystery is what it’s doing there.
“When we look at healthy corals, we see these really well-established microbial relationships,” says Apprill. Voolstra further adds: “Endozoicomonas make up a good portion of the bacterial biomass which further tells us that they must be doing something important.” Both researchers agree that the next task is to figure out what they’re doing—why the coral lets them in at all—to understand how they benefit the coral.
Apprill suspects the bacteria may help the coral recycle nutrients to stay healthy. She and her colleagues are currently designing new experiments to determine how the coral’s relationship with its bacterial companions works.
“This is not an easy task,” says Apprill, who plans to draw from studies of the human bacterial microbiome to explore the role of the coral’s bacterial communities. Future studies will focus on searching the Endozoicomonas group’s genetic code for bits of DNA that are associated with particular functions in other bacteria, and looking at other coral species to see if the bacteria lives inside them as well.
Understanding the bacteria’s relationship with Stylophora pistillata and other reef-building species could prove critical as corals face a growing number of threats to their health and survival.
“Corals are highly susceptible to the impacts of climate change, coastal development and overfishing,” says Apprill. “In order for scientists to predict the future success of corals, we need to understand their basic biology, including how their microorganisms may aid in keeping them healthy.”
As the team works to shed light on coral’s symbiosis with bacteria, it’s strengthening another mutually beneficial partnership: the multi-year collaboration between WHOI and KAUST, a new world-class, graduate-level scientific research university opened in 2009 along the shores of the Red Sea. Apprill worked closely with a number of KAUST researchers, including marine scientist Christian Voolstra, Syrian-born graduate student Areej Alsheikh-Hussain and WHOI-KAUST joint postdoctoral scholar Matthew Neave, to gather Stylophora pistillata samples, to extract and to analyze the genetic data it contained.
“This study wouldn’t have been possible without this collaboration,” says Apprill. “Working with people from different institutions who think differently from you leads you to think about things in new ways, and in this case to make new discoveries.”
The research was supported by a KAUST-WHOI Special Academic Partnership Fellows award, the WHOI internal funds, and a grant from the National Science Foundation.
The Woods Hole Oceanographic Institution is a private, non-profit organization on Cape Cod, Mass., dedicated to marine research, engineering, and higher education. Established in 1930 on a recommendation from the National Academy of Sciences, its primary mission is to understand the ocean and its interaction with the Earth as a whole, and to communicate a basic understanding of the ocean's role in the changing global environment.
WHOI Media Relations | EurekAlert!
Plant escape from waterlogging
17.10.2017 | Christian-Albrechts-Universität zu Kiel
Study suggests oysters offer hot spot for reducing nutrient pollution
17.10.2017 | Virginia Institute of Marine Science
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
It's possible to produce hydrogen to power fuel cells by extracting the gas from seawater, but the electricity required to do it makes the process costly. UCF...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
17.10.2017 | Life Sciences
17.10.2017 | Physics and Astronomy
17.10.2017 | Life Sciences