Bacterial Distribution in the Glacier Borehole Meltwater on the Eastern Broknes Peninsula of the Larsemann Hills and Adjacent Lake Water, East Antarctica
The distribution and assembly mechanisms of microorganisms in Antarctic lakes and glaciers remain poorly understood, despite their ecological significance. This study investigates the bacterial diversity and community composition in glacier borehole meltwater samples from the eastern Broknes Peninsu...
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MDPI AG
2025-03-01
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| author | Hongpeng Cui Jibin Han Bing Li Youhong Sun Da Gong Xiaopeng Fan Talalay Pavel Dayi Zhang Liang Gao Hongchen Jiang |
| author_facet | Hongpeng Cui Jibin Han Bing Li Youhong Sun Da Gong Xiaopeng Fan Talalay Pavel Dayi Zhang Liang Gao Hongchen Jiang |
| author_sort | Hongpeng Cui |
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| description | The distribution and assembly mechanisms of microorganisms in Antarctic lakes and glaciers remain poorly understood, despite their ecological significance. This study investigates the bacterial diversity and community composition in glacier borehole meltwater samples from the eastern Broknes Peninsula of the Larsemann Hills and adjacent lake water samples in East Antarctica using high—throughput 16S rRNA gene sequencing. The results show that bacterial diversity in glacier borehole meltwater increased with depth, but remained lower than in lake water. Significant compositional differences were observed between lake and glacier borehole bacterial communities, with higher relative abundances of <i>Actinobacteria</i>, <i>Bacteroidia</i>, <i>Cyanobacteriia,</i> and <i>Verrucomicrobiae</i> in glacier borehole water samples, while <i>Alphaproteobacteria</i>, <i>Gammaproteobacteria</i>, <i>OLB14</i> (phylum <i>Chloroflexi</i>), <i>Acidimicrobiia</i>, and <i>Thermoleophilia</i> were more abundant in lake samples. These differences were attributed to distinct community assembly mechanisms: stochastic processes (ecological drift and dispersal limitation) dominated in lakes, while both stochastic (ecological drift and homogeneous dispersal) and deterministic (homogeneous selection) processes played key roles in glacier boreholes. This study enhances our understanding of bacterial community assembly and distribution patterns in Antarctic glacier ecosystems, providing insights into microbial biodiversity and biogeochemical cycling in these extreme environments. |
| format | Article |
| id | doaj-art-4e75e9cbb95646d9be4aec28f7fff843 |
| institution | Kabale University |
| issn | 2076-2607 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
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| series | Microorganisms |
| spelling | doaj-art-4e75e9cbb95646d9be4aec28f7fff8432025-08-20T03:43:34ZengMDPI AGMicroorganisms2076-26072025-03-0113367910.3390/microorganisms13030679Bacterial Distribution in the Glacier Borehole Meltwater on the Eastern Broknes Peninsula of the Larsemann Hills and Adjacent Lake Water, East AntarcticaHongpeng Cui0Jibin Han1Bing Li2Youhong Sun3Da Gong4Xiaopeng Fan5Talalay Pavel6Dayi Zhang7Liang Gao8Hongchen Jiang9School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, ChinaQinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, ChinaHainan Institute, China University of Geosciences (Beijing), Sanya 572000, ChinaHainan Institute, China University of Geosciences (Beijing), Sanya 572000, ChinaPolar Research Centre, Jilin University, Changchun 130061, ChinaPolar Research Centre, Jilin University, Changchun 130061, ChinaPolar Research Centre, Jilin University, Changchun 130061, ChinaKey Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, ChinaSchool of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, ChinaThe distribution and assembly mechanisms of microorganisms in Antarctic lakes and glaciers remain poorly understood, despite their ecological significance. This study investigates the bacterial diversity and community composition in glacier borehole meltwater samples from the eastern Broknes Peninsula of the Larsemann Hills and adjacent lake water samples in East Antarctica using high—throughput 16S rRNA gene sequencing. The results show that bacterial diversity in glacier borehole meltwater increased with depth, but remained lower than in lake water. Significant compositional differences were observed between lake and glacier borehole bacterial communities, with higher relative abundances of <i>Actinobacteria</i>, <i>Bacteroidia</i>, <i>Cyanobacteriia,</i> and <i>Verrucomicrobiae</i> in glacier borehole water samples, while <i>Alphaproteobacteria</i>, <i>Gammaproteobacteria</i>, <i>OLB14</i> (phylum <i>Chloroflexi</i>), <i>Acidimicrobiia</i>, and <i>Thermoleophilia</i> were more abundant in lake samples. These differences were attributed to distinct community assembly mechanisms: stochastic processes (ecological drift and dispersal limitation) dominated in lakes, while both stochastic (ecological drift and homogeneous dispersal) and deterministic (homogeneous selection) processes played key roles in glacier boreholes. This study enhances our understanding of bacterial community assembly and distribution patterns in Antarctic glacier ecosystems, providing insights into microbial biodiversity and biogeochemical cycling in these extreme environments.https://www.mdpi.com/2076-2607/13/3/679bacterial communitylakesglaciercommunity assemblyLarsemann HillsAntarctic |
| spellingShingle | Hongpeng Cui Jibin Han Bing Li Youhong Sun Da Gong Xiaopeng Fan Talalay Pavel Dayi Zhang Liang Gao Hongchen Jiang Bacterial Distribution in the Glacier Borehole Meltwater on the Eastern Broknes Peninsula of the Larsemann Hills and Adjacent Lake Water, East Antarctica Microorganisms bacterial community lakes glacier community assembly Larsemann Hills Antarctic |
| title | Bacterial Distribution in the Glacier Borehole Meltwater on the Eastern Broknes Peninsula of the Larsemann Hills and Adjacent Lake Water, East Antarctica |
| title_full | Bacterial Distribution in the Glacier Borehole Meltwater on the Eastern Broknes Peninsula of the Larsemann Hills and Adjacent Lake Water, East Antarctica |
| title_fullStr | Bacterial Distribution in the Glacier Borehole Meltwater on the Eastern Broknes Peninsula of the Larsemann Hills and Adjacent Lake Water, East Antarctica |
| title_full_unstemmed | Bacterial Distribution in the Glacier Borehole Meltwater on the Eastern Broknes Peninsula of the Larsemann Hills and Adjacent Lake Water, East Antarctica |
| title_short | Bacterial Distribution in the Glacier Borehole Meltwater on the Eastern Broknes Peninsula of the Larsemann Hills and Adjacent Lake Water, East Antarctica |
| title_sort | bacterial distribution in the glacier borehole meltwater on the eastern broknes peninsula of the larsemann hills and adjacent lake water east antarctica |
| topic | bacterial community lakes glacier community assembly Larsemann Hills Antarctic |
| url | https://www.mdpi.com/2076-2607/13/3/679 |
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