UOG researcher discovers new diatom species in Micronesia

New Diatom Discovered Photo 2

Christopher Lobban, a University of Guam professor emeritus of biology, has discovered an interesting new species of diatom from the Marshall Islands. His discovery is in addition to two potentially new diatom species found earlier this year by UOG student Gabriella Prelosky and five potentially new species by UOG student Britney Sison. The study, which was funded by the university’s National Science Foundation EPSCoR grant, was accepted in October for publication in the peer-reviewed journal Diatom.

Diatoms are single-celled algae found in oceans, lakes, and rivers. They are considered important primary producers on Earth. According to Lobban, diatoms produce an estimated one-fifth of oxygen in the air we breathe.

The new species of diatom, Licmophora complanata, was named for its flattened cell wall. According to Lobban, the diatom was found in a sample of algae from Majuro Atoll that he collected in 1990. Licmophora is a genus of benthic diatoms. Diatoms within this genus are common and epiphytic — meaning that they perch on seaweeds, like orchids perch on trees.

“It’s a really odd-looking Licmophora,” said Lobban. “Licmophora are sort of people-shaped. They have a top and bottom and a front and back. The dead shells can usually be seen in the front and back views, but this one was always giving me a side view.”

Lobban was able to thoroughly examine the specimen once the Microscopy Teaching & Research Laboratory, which he runs, received a new Scanning Electron Microscope (SEM) through the EPSCoR grant in May 2021.

“The microscope has a stage that allows you to tilt it up to 80 degrees while examining a specimen,” said Lobban. “When I did that, I was able to see its shape, which is actually kind of complicated.”

According to Lobban, this is not the first time he has named a species of Licmophora.

“It’s not a huge genus and there are not many people working on it in the world. Most of the species here seem to be new to science. This is the 16th Licmophora I’ve named,” said Lobban, “and I’m not done with them yet. I’m working on a paper now with seven more species. It and several of the others have student coauthors.”

NSF Guam EPSCoR taps into the Open Science Grid

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Jeffrey Centino, research computing facilitator at EPSCoR -GECCO says the Open Science Grid will improve the program's computational and data analysis capabilities.

As research opportunities continue to expand for the University of Guam EPSCoR- Guam Ecosystems Collaboratorium for Corals and Oceans (GECCO) program, so does the need to improve its cyberinfrastructure to keep up with the additional computational and data analysis requirements.  

Part of the UOG EPSCoR-GECCO strategic plan is to implement high throughput computing (HTC) resources in Guam and to establish partnerships that would broaden access to off-campus HTC resources. According to the plan, “leveraging existing partnerships to enable remote access to HTC resources, implementation of local HTC hardware and effective user support will accelerate UOG’s capacity for data-intensive research, moving UOG closer to its goal of becoming a research-intensive university.”  

To beef up research computational capacity, the program is looking at tapping into the Open Science Grid (OSG). According to the strategic plan, the OSG will provide project research access to its distributed computing network to facilitate parallel computing and support GECCO research.  

Jeffrey Centino, research computing facilitator at EPSCoR –GECCO said the OSG 

is a collaboration between institutions, universities, and other research organizations to forward the field of science through high throughput computing.  

“So basically, you have these data centers located around the world and they are connected through high-speed internet, and they function together like a grid. So, say you need to run a job or an analysis, you can recruit these resources from around the world to complete your job in the fraction of the time compared to what is available to you in a single data center or your personal workstation.”   

He said high throughput computing breaks the computational work into smaller tasks, which can run concurrently using these resources. “Right now, we are running an analysis server and it is very under powered so basically researchers are fighting for computational space and once we get those researchers onboarded to the Open Science Grid, they can have their jobs or their analysis run within a fraction of the time,” Centino added.  

Centino said they are also expanding their computer clusters to support grid capacity, but the worldwide chip shortage caused by the COVID-19 pandemic restrictions delayed the process of acquiring the servers. “So, we are looking to launch early next year for the computer cluster, around the first quarter,” he said. 

The OSG has over 100 participants that provide access to large computing resources. The most notable ones include the Large Hadron Collider Beauty Experiment, the Fermi Natural Accelerator Lab (Fermilab), and Dark Energy Survey.

Study explores evolutionary stability of coral photosymbiosis

Coral Photosymbiosis Photo 1
Coral Photosymbiosis Photo 1
UOG alumnus Jordan Gault wrote “Lineage-specific variation in the evolutionary stability of coral photosymbiosis,” which was published in September 2021 by the journal Science Advances.

A study by University of Guam researchers has examined the evolutionary stability of photosymbiosis in scleractinian corals. The study, which was funded by the university’s National Science Foundation EPSCoR grant, was published in September in the peer-reviewed Science Advances journal.  

Scleractinian corals, also called stony corals, are the hard corals that are typically seen as reef-building corals found in shallow, tropical waters that receive nutrients from the photosymbiotic algae living in their tissues. In exchange for nutrients, the algae support the calcification of coral skeletons, encouraging the growth of expansive reefs in shallow tropical and subtropical waters. Photosymbiosis is a type of symbiotic relationship between two organisms that includes one that is capable of photosynthesis.  

However, half of the order’s members are non-photosymbiotic and tend to be small, not colonial, and are found in deep waters.  

“The origin of the order has been shrouded in mystery. When scleractinian corals first appeared in the fossil record, they were already highly diversified,” said lead author Jordan Gault, a UOG alumnus who wrote the paper for his master’s thesis. “There’s evidence that some of them were photosymbiotic, but where did they all come from? If they’re diversified already, there’s evolutionary history that goes further back that you cannot see in the fossil record yet. That’s one thing we’ve set out to understand with this study.”  

Coral Photosymbiosis Photo 2
Scleractinian corals, also called stony corals, are the hard corals that are typically seen as reef-building corals found in shallow, tropical waters that receive nutrients from the photosymbiotic algae living in their tissues. This photo of a scleractinian coral was taken in Apra Harbor by David Burdick, Guam NSF EPSCoR’s Biorepository collections manager.

The study reconstructed the evolutionary history of photosymbiosis in Scleractinia by applying mathematical models to phylogenetic trees, which are diagrams that show evolutionary relationships. The phylogenetic trees included 1471 of the 1619 recognized species in Scleractinia.  

“There are certain groups where the association seems to be almost irreversibly stable. Those two partners are bound to each other for the whole group and they thrive and die together while others may be more flexible,” said UOG Associate Professor Bastian Bentlage, the co-author of this study. “There may be some lineages – if they’re not as tightly integrated with the photosymbionts – that may be less susceptible to a breakdown of these relationships. That’s really cool in terms of understanding the dynamics of what we see on our reefs in a changing climate.”  

At first, the project faced delays because the initial simulation studies took a long time to run on the computational resources that were available at the time. To address these issues, the research team used the Open Science Grid, a network of computers spread nationally that allows open access to high throughput computing for research in the U.S.  

“Facilitating this study meant relying on this grid that was able to run hundreds of thousands of individual simulations,” said Bentlage. “That wouldn’t have been possible with a desktop computer. Having access to this high-speed computing grid was very essential to finishing it off.”  

As part of the Guam NSF EPSCoR’s strategic plan, the program is working on establishing a computation hub at UOG.  

Prior to pursuing a doctoral degree at the University of Oldenburg, Gault spent eight years at the UOG Marine Laboratory pursuing his thesis research and working for the long-term coral reef monitoring program. He said that getting the paper published feels like closing a chapter in his life.   

“It’s nice and a little bittersweet. I’m proud of the work that we did and I’m happy to have it out there. The question is now: is it useful for other scientists? Does it matter going forward? The best outcome is if it somehow shapes some research down the road. If people address our results and ask questions further down the line, I think that would be excellent,” said Gault.  

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