Antarctic Krill Are Reservoirs for Distinct Southern Ocean Microbial Communities
Host-associated bacterial communities have received limited attention in polar habitats, but are likely to represent distinct nutrient-rich niches compared to the surrounding environment. Antarctic krill (Euphausia superba) are a super-abundant species with a circumpolar distribution, and the krill...
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ftdoajarticles:oai:doaj.org/article:5b6e3ad17f884d628bdebafa62fee30b 2023-05-15T13:57:29+02:00 Antarctic Krill Are Reservoirs for Distinct Southern Ocean Microbial Communities Laurence J. Clarke Léonie Suter Robert King Andrew Bissett Bruce E. Deagle 2019-01-01T00:00:00Z https://doi.org/10.3389/fmicb.2018.03226 https://doaj.org/article/5b6e3ad17f884d628bdebafa62fee30b EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmicb.2018.03226/full https://doaj.org/toc/1664-302X 1664-302X doi:10.3389/fmicb.2018.03226 https://doaj.org/article/5b6e3ad17f884d628bdebafa62fee30b Frontiers in Microbiology, Vol 9 (2019) Antarctic krill Euphausia superba Southern Ocean microbiome high-throughput DNA sequencing 16S rRNA Microbiology QR1-502 article 2019 ftdoajarticles https://doi.org/10.3389/fmicb.2018.03226 2022-12-31T12:17:58Z Host-associated bacterial communities have received limited attention in polar habitats, but are likely to represent distinct nutrient-rich niches compared to the surrounding environment. Antarctic krill (Euphausia superba) are a super-abundant species with a circumpolar distribution, and the krill microbiome may make a substantial contribution to marine bacterial diversity in the Southern Ocean. We used high-throughput sequencing of the bacterial 16S ribosomal RNA gene to characterize bacterial diversity in seawater and krill tissue samples from four locations south of the Kerguelen Plateau, one of the most productive regions in the Indian Sector of the Southern Ocean. Krill-associated bacterial communities were distinct from those of the surrounding seawater, with different communities inhabiting the moults, digestive tract and faecal pellets, including several phyla not detected in the surrounding seawater. Digestive tissues from many individuals contained a potential gut symbiont (order: Mycoplasmoidales) shown to improve survival on a low quality diet in other crustaceans. Antarctic krill swarms thus influence Southern Ocean microbial communities not only through top-down grazing of eukaryotic cells and release of nutrients into the water column, but also by transporting distinct microbial assemblages horizontally via migration and vertically via sinking faecal pellets and moulted exuviae. Changes to Antarctic krill demographics or distribution through fishing pressure or climate-induced range shifts will also influence the composition and dispersal of Southern Ocean microbial communities. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Kerguelen Indian Frontiers in Microbiology 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic krill Euphausia superba Southern Ocean microbiome high-throughput DNA sequencing 16S rRNA Microbiology QR1-502 |
spellingShingle |
Antarctic krill Euphausia superba Southern Ocean microbiome high-throughput DNA sequencing 16S rRNA Microbiology QR1-502 Laurence J. Clarke Léonie Suter Robert King Andrew Bissett Bruce E. Deagle Antarctic Krill Are Reservoirs for Distinct Southern Ocean Microbial Communities |
topic_facet |
Antarctic krill Euphausia superba Southern Ocean microbiome high-throughput DNA sequencing 16S rRNA Microbiology QR1-502 |
description |
Host-associated bacterial communities have received limited attention in polar habitats, but are likely to represent distinct nutrient-rich niches compared to the surrounding environment. Antarctic krill (Euphausia superba) are a super-abundant species with a circumpolar distribution, and the krill microbiome may make a substantial contribution to marine bacterial diversity in the Southern Ocean. We used high-throughput sequencing of the bacterial 16S ribosomal RNA gene to characterize bacterial diversity in seawater and krill tissue samples from four locations south of the Kerguelen Plateau, one of the most productive regions in the Indian Sector of the Southern Ocean. Krill-associated bacterial communities were distinct from those of the surrounding seawater, with different communities inhabiting the moults, digestive tract and faecal pellets, including several phyla not detected in the surrounding seawater. Digestive tissues from many individuals contained a potential gut symbiont (order: Mycoplasmoidales) shown to improve survival on a low quality diet in other crustaceans. Antarctic krill swarms thus influence Southern Ocean microbial communities not only through top-down grazing of eukaryotic cells and release of nutrients into the water column, but also by transporting distinct microbial assemblages horizontally via migration and vertically via sinking faecal pellets and moulted exuviae. Changes to Antarctic krill demographics or distribution through fishing pressure or climate-induced range shifts will also influence the composition and dispersal of Southern Ocean microbial communities. |
format |
Article in Journal/Newspaper |
author |
Laurence J. Clarke Léonie Suter Robert King Andrew Bissett Bruce E. Deagle |
author_facet |
Laurence J. Clarke Léonie Suter Robert King Andrew Bissett Bruce E. Deagle |
author_sort |
Laurence J. Clarke |
title |
Antarctic Krill Are Reservoirs for Distinct Southern Ocean Microbial Communities |
title_short |
Antarctic Krill Are Reservoirs for Distinct Southern Ocean Microbial Communities |
title_full |
Antarctic Krill Are Reservoirs for Distinct Southern Ocean Microbial Communities |
title_fullStr |
Antarctic Krill Are Reservoirs for Distinct Southern Ocean Microbial Communities |
title_full_unstemmed |
Antarctic Krill Are Reservoirs for Distinct Southern Ocean Microbial Communities |
title_sort |
antarctic krill are reservoirs for distinct southern ocean microbial communities |
publisher |
Frontiers Media S.A. |
publishDate |
2019 |
url |
https://doi.org/10.3389/fmicb.2018.03226 https://doaj.org/article/5b6e3ad17f884d628bdebafa62fee30b |
geographic |
Antarctic Southern Ocean Kerguelen Indian |
geographic_facet |
Antarctic Southern Ocean Kerguelen Indian |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
op_source |
Frontiers in Microbiology, Vol 9 (2019) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmicb.2018.03226/full https://doaj.org/toc/1664-302X 1664-302X doi:10.3389/fmicb.2018.03226 https://doaj.org/article/5b6e3ad17f884d628bdebafa62fee30b |
op_doi |
https://doi.org/10.3389/fmicb.2018.03226 |
container_title |
Frontiers in Microbiology |
container_volume |
9 |
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1766265154329116672 |