Microbial distribution and turnover in Antarctic microbial mats highlight the relevance of heterotrophic bacteria in low-nutrient environments.
Maritime Antarctica has shown the highest increase in temperature in the Southern Hemisphere. Under this scenario, biogeochemical cycles may be altered, resulting in rapid environmental change for Antarctic biota. Microbes that drive biogeochemical cycles often form biofilms or microbial mats in con...
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ftcdlib:oai:escholarship.org/ark:/13030/qt7np717m1 2023-05-15T14:00:50+02:00 Microbial distribution and turnover in Antarctic microbial mats highlight the relevance of heterotrophic bacteria in low-nutrient environments. Valdespino-Castillo, Patricia M Cerqueda-García, Daniel Espinosa, Ana Cecilia Batista, Silvia Merino-Ibarra, Martín Taş, Neslihan Alcántara-Hernández, Rocío J Falcón, Luisa I 2018-09-01 https://escholarship.org/uc/item/7np717m1 unknown eScholarship, University of California qt7np717m1 https://escholarship.org/uc/item/7np717m1 public FEMS microbiology ecology, vol 94, iss 9 Bacteria Biofilms RNA Ribosomal 16S Rivers Ice Cover Antarctic Regions Heterotrophic Processes Hot Temperature Microbiota Nutrients Antarctica microbial mats photoheterotrophs psychrophilic ultraoligotrophy Microbiology Biological Sciences Medical and Health Sciences Environmental Sciences article 2018 ftcdlib 2020-05-08T22:54:42Z Maritime Antarctica has shown the highest increase in temperature in the Southern Hemisphere. Under this scenario, biogeochemical cycles may be altered, resulting in rapid environmental change for Antarctic biota. Microbes that drive biogeochemical cycles often form biofilms or microbial mats in continental meltwater environments. Limnetic microbial mats from the Fildes Peninsula were studied using high-throughput 16S rRNA gene sequencing. Mat samples were collected from 15 meltwater stream sites, comprising a natural gradient from ultraoligotrophic glacier flows to meltwater streams exposed to anthropogenic activities. Our analyses show that microbial community structure differences between mats are explained by environmental NH4+, NO3-, DIN, soluble reactive silicon and conductivity. Microbial mats living under ultraoligotrophic meltwater conditions did not exhibit a dominance of cyanobacterial photoautotrophs, as has been documented for other Antarctic limnetic microbial mats. Instead, ultraoligotrophic mat communities were characterized by the presence of microbes recognized as heterotrophs and photoheterotrophs. This suggests that microbial capabilities for recycling organic matter may be a key factor to dwell in ultra-low nutrient conditions. Our analyses show that phylotype level assemblages exhibit coupled distribution patterns in environmental oligotrophic inland waters. The evaluation of these microbes suggests the relevance of reproductive and structural strategies to pioneer these psychrophilic ultraoligotrophic environments. Article in Journal/Newspaper Antarc* Antarctic Antarctica University of California: eScholarship Antarctic Fildes ENVELOPE(-58.817,-58.817,-62.217,-62.217) Fildes peninsula ENVELOPE(-58.948,-58.948,-62.182,-62.182) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Bacteria Biofilms RNA Ribosomal 16S Rivers Ice Cover Antarctic Regions Heterotrophic Processes Hot Temperature Microbiota Nutrients Antarctica microbial mats photoheterotrophs psychrophilic ultraoligotrophy Microbiology Biological Sciences Medical and Health Sciences Environmental Sciences |
spellingShingle |
Bacteria Biofilms RNA Ribosomal 16S Rivers Ice Cover Antarctic Regions Heterotrophic Processes Hot Temperature Microbiota Nutrients Antarctica microbial mats photoheterotrophs psychrophilic ultraoligotrophy Microbiology Biological Sciences Medical and Health Sciences Environmental Sciences Valdespino-Castillo, Patricia M Cerqueda-García, Daniel Espinosa, Ana Cecilia Batista, Silvia Merino-Ibarra, Martín Taş, Neslihan Alcántara-Hernández, Rocío J Falcón, Luisa I Microbial distribution and turnover in Antarctic microbial mats highlight the relevance of heterotrophic bacteria in low-nutrient environments. |
topic_facet |
Bacteria Biofilms RNA Ribosomal 16S Rivers Ice Cover Antarctic Regions Heterotrophic Processes Hot Temperature Microbiota Nutrients Antarctica microbial mats photoheterotrophs psychrophilic ultraoligotrophy Microbiology Biological Sciences Medical and Health Sciences Environmental Sciences |
description |
Maritime Antarctica has shown the highest increase in temperature in the Southern Hemisphere. Under this scenario, biogeochemical cycles may be altered, resulting in rapid environmental change for Antarctic biota. Microbes that drive biogeochemical cycles often form biofilms or microbial mats in continental meltwater environments. Limnetic microbial mats from the Fildes Peninsula were studied using high-throughput 16S rRNA gene sequencing. Mat samples were collected from 15 meltwater stream sites, comprising a natural gradient from ultraoligotrophic glacier flows to meltwater streams exposed to anthropogenic activities. Our analyses show that microbial community structure differences between mats are explained by environmental NH4+, NO3-, DIN, soluble reactive silicon and conductivity. Microbial mats living under ultraoligotrophic meltwater conditions did not exhibit a dominance of cyanobacterial photoautotrophs, as has been documented for other Antarctic limnetic microbial mats. Instead, ultraoligotrophic mat communities were characterized by the presence of microbes recognized as heterotrophs and photoheterotrophs. This suggests that microbial capabilities for recycling organic matter may be a key factor to dwell in ultra-low nutrient conditions. Our analyses show that phylotype level assemblages exhibit coupled distribution patterns in environmental oligotrophic inland waters. The evaluation of these microbes suggests the relevance of reproductive and structural strategies to pioneer these psychrophilic ultraoligotrophic environments. |
format |
Article in Journal/Newspaper |
author |
Valdespino-Castillo, Patricia M Cerqueda-García, Daniel Espinosa, Ana Cecilia Batista, Silvia Merino-Ibarra, Martín Taş, Neslihan Alcántara-Hernández, Rocío J Falcón, Luisa I |
author_facet |
Valdespino-Castillo, Patricia M Cerqueda-García, Daniel Espinosa, Ana Cecilia Batista, Silvia Merino-Ibarra, Martín Taş, Neslihan Alcántara-Hernández, Rocío J Falcón, Luisa I |
author_sort |
Valdespino-Castillo, Patricia M |
title |
Microbial distribution and turnover in Antarctic microbial mats highlight the relevance of heterotrophic bacteria in low-nutrient environments. |
title_short |
Microbial distribution and turnover in Antarctic microbial mats highlight the relevance of heterotrophic bacteria in low-nutrient environments. |
title_full |
Microbial distribution and turnover in Antarctic microbial mats highlight the relevance of heterotrophic bacteria in low-nutrient environments. |
title_fullStr |
Microbial distribution and turnover in Antarctic microbial mats highlight the relevance of heterotrophic bacteria in low-nutrient environments. |
title_full_unstemmed |
Microbial distribution and turnover in Antarctic microbial mats highlight the relevance of heterotrophic bacteria in low-nutrient environments. |
title_sort |
microbial distribution and turnover in antarctic microbial mats highlight the relevance of heterotrophic bacteria in low-nutrient environments. |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/7np717m1 |
long_lat |
ENVELOPE(-58.817,-58.817,-62.217,-62.217) ENVELOPE(-58.948,-58.948,-62.182,-62.182) |
geographic |
Antarctic Fildes Fildes peninsula |
geographic_facet |
Antarctic Fildes Fildes peninsula |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
FEMS microbiology ecology, vol 94, iss 9 |
op_relation |
qt7np717m1 https://escholarship.org/uc/item/7np717m1 |
op_rights |
public |
_version_ |
1766270171926757376 |