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 2023-10-01T03:50:41+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 fiy129 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 Life Below Water Antarctic Regions Bacteria Biofilms Heterotrophic Processes Hot Temperature Ice Cover Microbiota Nutrients RNA Ribosomal 16S Rivers microbial mats ultraoligotrophy photoheterotrophs psychrophilic Antarctica Environmental Sciences Biological Sciences Medical and Health Sciences Microbiology article 2018 ftcdlib 2023-09-04T18:03:09Z 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 |
Life Below Water Antarctic Regions Bacteria Biofilms Heterotrophic Processes Hot Temperature Ice Cover Microbiota Nutrients RNA Ribosomal 16S Rivers microbial mats ultraoligotrophy photoheterotrophs psychrophilic Antarctica Environmental Sciences Biological Sciences Medical and Health Sciences Microbiology |
spellingShingle |
Life Below Water Antarctic Regions Bacteria Biofilms Heterotrophic Processes Hot Temperature Ice Cover Microbiota Nutrients RNA Ribosomal 16S Rivers microbial mats ultraoligotrophy photoheterotrophs psychrophilic Antarctica Environmental Sciences Biological Sciences Medical and Health Sciences Microbiology 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 |
Life Below Water Antarctic Regions Bacteria Biofilms Heterotrophic Processes Hot Temperature Ice Cover Microbiota Nutrients RNA Ribosomal 16S Rivers microbial mats ultraoligotrophy photoheterotrophs psychrophilic Antarctica Environmental Sciences Biological Sciences Medical and Health Sciences Microbiology |
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 |
op_coverage |
fiy129 |
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_ |
1778526365093462016 |