Nature Communications<\/a>, found SAR11 bacteria are not a single, uniform population as often thought.<\/p>\nARTICLE CONTINUES BELOW AD<\/p>\n
Instead, they are organized into stable, ecologically distinct groups \u2014 essentially specialized \u201cteams\u201d adapted to specific environments, such as the coast versus the open ocean.<\/p>\n
This means one of the ocean\u2019s most important engines is far more complex than previously known.<\/p>\n
The team \u2014 using O\u02bbahu\u2019s K\u0101ne\u02bbohe Bay as a natural laboratory \u2014 linked newly cultivated strains to ocean samples worldwide, showing that these distinct ecological groups differ significantly in habitat preference, gene content and evolutionary history.<\/p>\n
\u201cK\u0101ne\u02bbohe Bay gave us a rare window into how microbial populations can adapt across very small spatial scales,\u201d said the study\u2019s lead author at Hawai\u02bbi Institute of Marine Biology Kelle Freel in a release about the findings. \u201cBy pairing cultivation with a long-term time series, we could directly connect genomes to real ecological differences in the ocean.\u201d<\/p>\n
ARTICLE CONTINUES BELOW AD<\/p>\n
SAR11 bacteria are tiny, streamlined cells that play a central role in marine carbon and nutrient cycling.<\/p>\n
Despite their global importance, scientists struggle to understand how SAR11 populations differ from one another, in part because these microbes are extremely diverse and very difficult to grow in the laboratory.<\/p>\n
K\u0101ne\u02bbohe Bay provided a uniquely powerful model system to overcome these challenges.<\/p>\n
Years of sustained sampling through the K\u0101ne\u02bbohe Bay Time-series allowed researchers to pair environmental measurements with newly grown SAR11 strains, creating an opportunity to connect microbial DNA with where these organisms live and how they survive.<\/p>\n
ARTICLE CONTINUES BELOW AD<\/p>\n
\u201cThis work shows that SAR11 diversity is not random,\u201d said principal investigator at Hawai\u02bbi Institute of Marine Biology Michael Rapp\u00e9 in the release. \u201cBy using K\u0101ne\u02bbohe Bay as a model system, we could integrate genomics with ecology in a way that reveals clear evolutionary structure \u2014 structure that holds across the global ocean and provides a common framework for studying one of the planet\u2019s most important microbial groups.\u201d<\/p>\n
By culturing and sequencing the whole genomes of 81 new SAR11 isolates originating from coastal and offshore waters, researchers tripled the number of complete genomes available for strains of this bacterial group.<\/p>\n
ARTICLE CONTINUES BELOW ADARTICLE CONTINUES BELOW AD<\/p>\n
When these genomes were analyzed together with more than 1,300 marine metagenomes from oceans around the world, clear and repeatable ecological patterns emerged.<\/p>\n
![\"\"](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2026\/01\/UH-bacteria-study-2-USE-898x1024.jpg\")
Photo credit: Kelle Freel<\/p>\n
SAR11 bacteria consistently grouped into ecologically distinct units, whose members shared similar habitats and biological traits across space and time, rather than blending together as one large population.<\/p>\n
A related study published in The ISME Journal<\/a> revealed that SAR11 bacteria \u2014 whether they thrive near the coast or in the open ocean around K\u0101ne\u02bbohe Bay \u2014 can depend on just a small number of genes under strong environmental selection.<\/p>\nThese findings show how small genetic differences can lead to significant ecological differences, helping explain how SAR11 maintains diversity despite large population sizes and global dispersal.<\/p>\n","protected":false},"excerpt":{"rendered":"A groundbreaking study led by the University of Hawai\u02bbi at M\u0101noa\u2019s Hawai\u02bbi Institute of Marine Biology revealed critical…\n","protected":false},"author":2,"featured_media":222380,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[114866,114867,114868,104297,106981,61,60,104296,107108,107109,114869,114870,114871,114872,82],"class_list":["post-222379","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-adapted-to-specific-environments","tag-can-more-accurately-predict-how-ocean-ecosystem-will-react-to-threats","tag-critical-new-details","tag-hawaii-institute-of-marine-biology","tag-hawaii-news","tag-ie","tag-ireland","tag-kaneohe-bay","tag-kauai-news","tag-kauai-now","tag-move-and-recycle-carbon-nutrients","tag-natural-laboratory","tag-not-single-uniform-population","tag-one-of-ocean","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/222379","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/comments?post=222379"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/222379\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media\/222380"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media?parent=222379"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/categories?post=222379"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/tags?post=222379"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"\"](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2026\/01\/UH-bacteria-study-1-USE-1024x772.jpg\")
Researchers sample surface seawater as a part of the K\u0101ne\u02bbohe Time Series, established in 2017 by the Rapp\u00e9 Laboratory for Aquatic Microbial Ecology. (Photo Credit: Kelle Freel)<\/p>\n