Microbial communities as indicators of anthropogenic impacts in Antarctic lakes

Fildes Peninsula is one of the Antarctic regions having the highest intensity of human activity, and the region is also greatly influenced by global warming. The ice-free area of the peninsula is the site of numerous lakes, some of which are used as water sources for Antarctic stations. I studied a...

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Detalles Bibliográficos
Autor: Florencia Bertoglio
Tipo de recurso: tesis doctoral
Estado:Versión publicada
Fecha de publicación:2026
País:Uruguay
Institución:Instituto de Investigaciones Biológicas Clemente Estable
Repositorio:IIBCE en REDI
Idioma:inglés
OAI Identifier:oai:redi.anii.org.uy:20.500.12381/5422
Acceso en línea:https://hdl.handle.net/20.500.12381/5422
Access Level:acceso abierto
Palabra clave:Limnología, Paleolimnología, Microbiología, Ecología
Ciencias Naturales y Exactas
Ciencias Biológicas
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network_acronym_str UY
network_name_str Uruguay
repository_id_str
dc.title.none.fl_str_mv Microbial communities as indicators of anthropogenic impacts in Antarctic lakes
title Microbial communities as indicators of anthropogenic impacts in Antarctic lakes
spellingShingle Microbial communities as indicators of anthropogenic impacts in Antarctic lakes
Florencia Bertoglio
Limnología, Paleolimnología, Microbiología, Ecología
Ciencias Naturales y Exactas
Ciencias Biológicas
title_short Microbial communities as indicators of anthropogenic impacts in Antarctic lakes
title_full Microbial communities as indicators of anthropogenic impacts in Antarctic lakes
title_fullStr Microbial communities as indicators of anthropogenic impacts in Antarctic lakes
title_full_unstemmed Microbial communities as indicators of anthropogenic impacts in Antarctic lakes
title_sort Microbial communities as indicators of anthropogenic impacts in Antarctic lakes
dc.creator.none.fl_str_mv Florencia Bertoglio
dc.creator.advisor.none.fl_str_mv Dermot Antoniades, Claudia Piccini
author Florencia Bertoglio
author_facet Florencia Bertoglio
author_role author
dc.subject.es.fl_str_mv Limnología, Paleolimnología, Microbiología, Ecología
topic Limnología, Paleolimnología, Microbiología, Ecología
Ciencias Naturales y Exactas
Ciencias Biológicas
dc.subject.anii.none.fl_str_mv Ciencias Naturales y Exactas
Ciencias Biológicas
description Fildes Peninsula is one of the Antarctic regions having the highest intensity of human activity, and the region is also greatly influenced by global warming. The ice-free area of the peninsula is the site of numerous lakes, some of which are used as water sources for Antarctic stations. I studied a series of lakes of the Fildes Peninsula using a combined limnological-paleolimnological approach in order to assess and reconstruct microbial community structure before and after the onset of human presence and activity in Antarctica. This thesis consists of three chapters: In the first chapter, I studied seven lakes around Fildes Peninsula through the analysis of phytoplankton and bacterioplankton communities when the lakes were ice-cover (spring) and before the summer, when the lakes were ice-free. We found that seasonal differences were the main causes structuring microbial diversity. These results suggest that longer ice- free periods such as those predicted for the future, and the presence of contaminants due to the increase in human impact in the area, may affect microbial communities and thus overall system functioning. The second chapter asses the anthropogenic effect in Fildes Peninsula evaluating the pre- and post-anthropic sediments of the same lakes, by estimating metal enrichment and changes in bacterial communities before and after the establishment of year-round human presence in the area. Two lakes very close to roads and airport infrastructure showed increases of metals as well as bacteria taxa associated with polluted environments. This study confirms that bacterial DNA is well preserved in Antarctic lake sediments and is a good sedimentary proxy for inferring changes related to anthropogenic impacts. The third chapter evaluated detailed sedimentary profiles of metal concentrations, bacterial DNA and diatom diversity and teratologies in two of the impacted lakes close to logistics and scientific infrastructure, and in one lake more distant to the stations. Diatom and bacteria changes observed in the lake more distant from infrastructure were shown to be related to climate change, while we confirmed human impacts in the other lakes from the observed increase in metal concentrations, changes in diatom taxa and diatom teratologies related to metal enrichment. This study helps to better understand how human activities and climate change have affected the local landscape around Fildes Peninsula and how the region's ecosystems will respond to future changes. This thesis demonstrates that microbial communities are sentinels of adaptive response to environmental change related both to climate change as well as to local human impacts. Moreover, it contributes to the growing awareness of the impact that human beings are having on sensitive Antarctic ecosystems.
publishDate 2026
dc.date.accessioned.none.fl_str_mv 2026-02-12T17:55:09Z
dc.date.available.none.fl_str_mv 2026-02-12T17:55:09Z
dc.date.issued.none.fl_str_mv 2026-02-04
dc.type.es.fl_str_mv Tesis de doctorado
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
dc.type.version.es.fl_str_mv Publicado
dc.type.version.none.fl_str_mv info:eu-repo/semantics/publishedVersion
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.none.fl_str_mv https://hdl.handle.net/20.500.12381/5422
dc.identifier.anii.es.fl_str_mv 2016_1_135896
url https://hdl.handle.net/20.500.12381/5422
identifier_str_mv 2016_1_135896
dc.language.iso.none.fl_str_mv eng
language eng
dc.rights.*.fl_str_mv Acceso abierto
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
dc.rights.license.none.fl_str_mv Reconocimiento 4.0 Internacional. (CC BY)
rights_invalid_str_mv Reconocimiento 4.0 Internacional. (CC BY)
Acceso abierto
eu_rights_str_mv openAccess
dc.publisher.es.fl_str_mv Université Laval
dc.source.none.fl_str_mv reponame:IIBCE en REDI
instname:Instituto de Investigaciones Biológicas Clemente Estable
instacron:Instituto de Investigaciones Biológicas Clemente Estable
instname_str Instituto de Investigaciones Biológicas Clemente Estable
instacron_str Instituto de Investigaciones Biológicas Clemente Estable
institution Instituto de Investigaciones Biológicas Clemente Estable
reponame_str IIBCE en REDI
collection IIBCE en REDI
bitstream.url.fl_str_mv https://redi.anii.org.uy/jspui/bitstream/20.500.12381/5422/2/license.txt
https://redi.anii.org.uy/jspui/bitstream/20.500.12381/5422/1/Microbial%20communities%20as%20indicators%20of%20anthropogenic%20impacts%20in%20Antarctic%20lakes.pdf
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bitstream.checksumAlgorithm.fl_str_mv MD5
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repository.name.fl_str_mv IIBCE en REDI - Instituto de Investigaciones Biológicas Clemente Estable
repository.mail.fl_str_mv vcarballo@iibce.edu.uy
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spelling Reconocimiento 4.0 Internacional. (CC BY)Acceso abiertoinfo:eu-repo/semantics/openAccess2026-02-12T17:55:09Z2026-02-12T17:55:09Z2026-02-04https://hdl.handle.net/20.500.12381/54222016_1_135896Fildes Peninsula is one of the Antarctic regions having the highest intensity of human activity, and the region is also greatly influenced by global warming. The ice-free area of the peninsula is the site of numerous lakes, some of which are used as water sources for Antarctic stations. I studied a series of lakes of the Fildes Peninsula using a combined limnological-paleolimnological approach in order to assess and reconstruct microbial community structure before and after the onset of human presence and activity in Antarctica. This thesis consists of three chapters: In the first chapter, I studied seven lakes around Fildes Peninsula through the analysis of phytoplankton and bacterioplankton communities when the lakes were ice-cover (spring) and before the summer, when the lakes were ice-free. We found that seasonal differences were the main causes structuring microbial diversity. These results suggest that longer ice- free periods such as those predicted for the future, and the presence of contaminants due to the increase in human impact in the area, may affect microbial communities and thus overall system functioning. The second chapter asses the anthropogenic effect in Fildes Peninsula evaluating the pre- and post-anthropic sediments of the same lakes, by estimating metal enrichment and changes in bacterial communities before and after the establishment of year-round human presence in the area. Two lakes very close to roads and airport infrastructure showed increases of metals as well as bacteria taxa associated with polluted environments. This study confirms that bacterial DNA is well preserved in Antarctic lake sediments and is a good sedimentary proxy for inferring changes related to anthropogenic impacts. The third chapter evaluated detailed sedimentary profiles of metal concentrations, bacterial DNA and diatom diversity and teratologies in two of the impacted lakes close to logistics and scientific infrastructure, and in one lake more distant to the stations. Diatom and bacteria changes observed in the lake more distant from infrastructure were shown to be related to climate change, while we confirmed human impacts in the other lakes from the observed increase in metal concentrations, changes in diatom taxa and diatom teratologies related to metal enrichment. This study helps to better understand how human activities and climate change have affected the local landscape around Fildes Peninsula and how the region's ecosystems will respond to future changes. This thesis demonstrates that microbial communities are sentinels of adaptive response to environmental change related both to climate change as well as to local human impacts. Moreover, it contributes to the growing awareness of the impact that human beings are having on sensitive Antarctic ecosystems.Agencia Nacional de Investigación e InnovaciónengUniversité LavalLimnología, Paleolimnología, Microbiología, EcologíaCiencias Naturales y ExactasCiencias BiológicasMicrobial communities as indicators of anthropogenic impacts in Antarctic lakesTesis de doctoradoPublicadoinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis//Ciencias Naturales y Exactas/Ciencias Biológicas/Ciencias Biológicasreponame:IIBCE en REDIinstname:Instituto de Investigaciones Biológicas Clemente Estableinstacron:Instituto de Investigaciones Biológicas Clemente EstableFlorencia BertoglioDermot Antoniades, Claudia PicciniLICENSElicense.txtlicense.txttext/plain; charset=utf-85151https://redi.anii.org.uy/jspui/bitstream/20.500.12381/5422/2/license.txtfcc8b2ddb26c820405a37f9e0cae7f18MD52ORIGINALMicrobial communities as indicators of anthropogenic impacts in Antarctic lakes.pdfMicrobial communities as indicators of anthropogenic impacts in Antarctic lakes.pdfapplication/pdf7618116https://redi.anii.org.uy/jspui/bitstream/20.500.12381/5422/1/Microbial%20communities%20as%20indicators%20of%20anthropogenic%20impacts%20in%20Antarctic%20lakes.pdf8d6cddc06f7f328d273a2567a4ddb210MD5120.500.12381/54222026-02-12 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