{"691259":{"#nid":"691259","#data":{"type":"news","title":"Tiny Predatory Bacteria Help Protect Endangered Caribbean Corals","body":[{"value":"\u003Cp dir=\u0022ltr\u0022\u003EA microscopic predator may offer a new way to protect some of the Caribbean\u2019s most endangered corals. Georgia Tech researchers found that tiny predatory bacteria can halt the spread of a destructive coral disease by hunting and consuming pathogens responsible for the infection.\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003ECaused by the\u0026nbsp;\u003Cem\u003EVibrio coralliilyticus\u0026nbsp;\u003C\/em\u003Epathogen, the infection is one of the most notorious causes of tissue loss and death in stony corals. In the study, all untreated corals bleached within 48 hours. But corals exposed to the predatory bacteria fared much better: more than half showed no signs of bleaching beyond the infection site \u2014 and disease progression was effectively halted.\u0026nbsp;\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003E\u201cDisease is a major driver of death for these corals, and with sea surface temperatures continuing to rise globally, we anticipate that rates of disease will only increase. It\u2019s part of a deadly synergy profoundly threatening Caribbean coral reefs,\u201d says lead author\u0026nbsp;\u003Ca href=\u0022https:\/\/biosciences.gatech.edu\/people\/lauren%20speare\u0022\u003E\u003Cstrong\u003ELauren Speare\u003C\/strong\u003E\u003C\/a\u003E, assistant professor in the\u0026nbsp;\u003Ca href=\u0022http:\/\/biosciences.gatech.edu\u0022\u003ESchool of Biological Sciences\u003C\/a\u003E.\u0026nbsp;\u201cPredatory bacteria function like a living probiotic, fighting coral disease without harsh side effects. This could be a targeted way to protect and treat our most vulnerable coral reefs.\u0022\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003EThe study, \u201c\u003Ca href=\u0022https:\/\/academic.oup.com\/ismej\/article\/19\/1\/wraf270\/8376498\u0022\u003EHalobacteriovorax Halts Disease Progression in Endangered Caribbean Corals\u003C\/a\u003E,\u201d was published in The\u0026nbsp;\u003Cem\u003EISME Journal\u003C\/em\u003E. In addition to Speare, the research team included Georgia Tech master\u0027s student\u0026nbsp;\u003Cstrong\u003EChloe Manley\u003C\/strong\u003E and postdoctoral scholar\u0026nbsp;\u003Cstrong\u003EMacey Coppinger\u003C\/strong\u003E; University of California, Santa Barbara graduate students\u0026nbsp;\u003Cstrong\u003ESunni Patton\u0026nbsp;\u003C\/strong\u003Eand\u0026nbsp;\u003Cstrong\u003EEddie Fuques\u003C\/strong\u003E, and Professor\u0026nbsp;\u003Ca href=\u0022https:\/\/www.eemb.ucsb.edu\/people\/faculty\/vega-thurber\u0022\u003E\u003Cstrong\u003ERebecca Vega Thurber\u003C\/strong\u003E\u003C\/a\u003E, director of the UCSB Marine Science Institute.\u003C\/p\u003E\u003Ch2 dir=\u0022ltr\u0022\u003E\u003Cstrong\u003ENatural Defenders\u003C\/strong\u003E\u003C\/h2\u003E\u003Cp dir=\u0022ltr\u0022\u003ESpeare became interested in the research while completing her postdoctoral training with Thurber. \u201cDr. Thurber discovered that predatory bacteria are present in many coral microbiomes,\u201d Speare recalls. \u201cWe theorized that they might be contributing to what keeps the ecosystem healthy, balancing it through predation.\u201d\u0026nbsp;\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003EAt the time, the theory was hard to test. Marine predatory bacteria are difficult to preserve long-term, making experiments challenging. The bacteria are also extremely scarce, with populations increasing during a coral infection and rapidly declining after. Catching them while their populations are high is a matter of timing, Speare says.\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003E\u0022It\u0027s a bit like trying to catch a mountain lion in the act of hunting a deer. If we aren\u2019t looking at the right time, we might miss it entirely,\u201d Speare says. \u201cI knew that if I wanted to study these bacteria in more detail, I would need to carefully design my experiments and timing.\u201d\u003C\/p\u003E\u003Ch2 dir=\u0022ltr\u0022\u003E\u003Cstrong\u003ETesting the Treatment\u003C\/strong\u003E\u003C\/h2\u003E\u003Cp dir=\u0022ltr\u0022\u003ETo test their theory, the team spent six weeks conducting experiments at the\u0026nbsp;\u003Ca href=\u0022https:\/\/mote.org\/location\/summerland-key-lab\/\u0022\u003EMote\u2019s Elizabeth Moore International Center for Coral Reef Research and Restoration (IC2R3)\u003C\/a\u003E in Summerland Key, Florida, a facility that maintains lab-grown living corals in seawater aquariums.\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003E\u201cFirst, we had to make our corals sick,\u201d Speare says. \u201cBut there wasn\u2019t an established way to reliably create these infections in this species in a laboratory setting.\u201d\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003EAfter weeks of experimenting, Speare developed a \u201cpathogen-sticker,\u201d a small agar patch containing the disease-causing pathogens. When placed at the coral\u2019s base, it mimics how infections spread in the wild.\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003EThen,\u0026nbsp;at the first sign of infection, the team treated the coral with the \u003Cem\u003EHalobacteriovorax \u003C\/em\u003Epredatory bacteria\u003Cem\u003E. \u003C\/em\u003E\u201cSurprisingly, the most effective method was to pour the bacteria directly into the sick coral\u2019s tank,\u201d Speare says. \u201cThe bacteria are tiny, so we were able to create a concentrated liquid of them by using a filter small enough that only they can pass through.\u201d\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003E\u003Cem\u003EHalobacteriovorax\u0026nbsp;\u003C\/em\u003Eare among the fastest-known predatory bacteria, and quickly navigate to their food source \u2013 presumably the pathogen causing the infection.\u003C\/p\u003E\u003Ch2 dir=\u0022ltr\u0022\u003E\u003Cstrong\u003EFrom Aquariums to Oceans\u003C\/strong\u003E\u003C\/h2\u003E\u003Cp dir=\u0022ltr\u0022\u003EBecause of the straightforward delivery method, Speare believes the team\u2019s methods could be readily adapted for coral restoration efforts, offering a simple way to deliver treatment on natural reefs.\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003E\u201cThere are several approaches to treating corals and mitigating stress, but these techniques don\u2019t work for all situations and all species,\u201d she explains. \u201cCorals are complex, and there is no single cure-all, so we need as many tools as possible to help corals survive.\u201d\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003EFor Speare, the next step will be to move from lab-based work to reef environments.\u0026nbsp; She\u2019s particularly curious as to why the predatory bacteria aren\u2019t already moderating illness on natural reefs. \u201cIf this is such an effective way to control pathogens, why isn\u2019t this system preventing disease outbreaks on reefs already?\u0022 she says. \u0022We need to understand what\u0027s limiting this natural defense system \u2013 and that\u2019s what we\u2019re digging into next.\u0022\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003E\u003Cem\u003EFunding:\u0026nbsp;Lauren Speare was supported as a Simons Foundation Awardee of the Life Sciences Research Foundation. The Vega Thurber Lab was funded by the National Science Foundation.\u003C\/em\u003E\u003C\/p\u003E\u003Cp dir=\u0022ltr\u0022\u003E\u003Cem\u003EDOI:\u0026nbsp;\u003C\/em\u003E\u003Ca href=\u0022https:\/\/doi.org\/10.1093\/ismejo\/wraf270\u0022\u003E\u003Cem\u003Ehttps:\/\/doi.org\/10.1093\/ismejo\/wraf270\u003C\/em\u003E\u003C\/a\u003E\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EGeorgia Tech researchers found that predatory bacteria can halt the spread of a destructive coral disease by hunting and consuming pathogens responsible for the infection.\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Georgia Tech researchers found that predatory bacteria can halt the spread of a destructive coral disease by hunting and consuming pathogens responsible for the infection."}],"uid":"35599","created_gmt":"2026-07-27 16:39:09","changed_gmt":"2026-07-29 01:42:03","author":"sperrin6","boilerplate_text":"","field_publication":"","field_article_url":"","location":"Atlanta, GA","dateline":{"date":"2026-07-27T00:00:00-04:00","iso_date":"2026-07-27T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"680709":{"id":"680709","type":"image","title":"Staghorn coral samples used in Lauren Speare\u0027s research.","body":"\u003Cdiv\u003EStaghorn coral samples used in Lauren Speare\u0027s research.\u003C\/div\u003E","created":"1785289113","gmt_created":"2026-07-29 01:38:33","changed":"1785289113","gmt_changed":"2026-07-29 01:38:33","alt":"Staghorn coral samples used in Lauren Speare\u0027s research.","file":{"fid":"265012","name":"coral-3.jpg","image_path":"\/sites\/default\/files\/2026\/07\/28\/coral-3.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2026\/07\/28\/coral-3.jpg","mime":"image\/jpeg","size":3474517,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2026\/07\/28\/coral-3.jpg?itok=YDfZY4SX"}},"680710":{"id":"680710","type":"image","title":"Lauren Speare sampling corals in the lab. ","body":"\u003Cp\u003ELauren Speare sampling corals in the lab.\u0026nbsp;\u003C\/p\u003E","created":"1785289113","gmt_created":"2026-07-29 01:38:33","changed":"1785289113","gmt_changed":"2026-07-29 01:38:33","alt":"Lauren Speare sampling corals in the lab. ","file":{"fid":"265013","name":"sampling-1.png","image_path":"\/sites\/default\/files\/2026\/07\/28\/sampling-1.png","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2026\/07\/28\/sampling-1.png","mime":"image\/png","size":2816600,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2026\/07\/28\/sampling-1.png?itok=7gsS4R-m"}}},"media_ids":["680709","680710"],"groups":[{"id":"1278","name":"College of Sciences"},{"id":"1188","name":"Research Horizons"},{"id":"1275","name":"School of Biological Sciences"}],"categories":[{"id":"138","name":"Biotechnology, Health, Bioengineering, Genetics"},{"id":"154","name":"Environment"},{"id":"146","name":"Life Sciences and Biology"},{"id":"135","name":"Research"}],"keywords":[{"id":"192250","name":"cos-microbial"},{"id":"192254","name":"cos-climate"},{"id":"187423","name":"go-bio"},{"id":"187915","name":"go-researchnews"}],"core_research_areas":[{"id":"39441","name":"Bioengineering and Bioscience"},{"id":"193653","name":"Georgia Tech Research Institute"}],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003E\u003Ca href=\u0022mailto:sperrin6@gatech.edu\u0022\u003ESelena Langner\u0026nbsp;\u003C\/a\u003E\u003Cbr\u003ETechnical Research Writer \/ Editor\u0026nbsp;\u003Cbr\u003EGeorgia Tech College of Sciences\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}