Melt season dynamics in a High Arctic estuarine tidal flat: A microbial perspective
The substantial influx of freshwater to High Arctic coastal ecosystems influences nutrient, organic matter, and sediment dynamics, stratification, and light availability throughout the melt season. These changes shape pelagic microbial community composition and functioning, though little is known ab...
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UiT Norges arktiske universitet
2022
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ftunivtroemsoe:oai:munin.uit.no:10037/25746 2023-05-15T14:49:54+02:00 Melt season dynamics in a High Arctic estuarine tidal flat: A microbial perspective Handler, Eleanor Ruth 2022-05-16 https://hdl.handle.net/10037/25746 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/25746 Copyright 2022 The Author(s) VDP::Mathematics and natural science: 400::Basic biosciences: 470::Molecular biology: 473 VDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Molekylærbiologi: 473 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Basic biosciences: 470::General microbiology: 472 VDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472 BIO-3950 Master thesis Mastergradsoppgave 2022 ftunivtroemsoe 2022-07-06T22:58:56Z The substantial influx of freshwater to High Arctic coastal ecosystems influences nutrient, organic matter, and sediment dynamics, stratification, and light availability throughout the melt season. These changes shape pelagic microbial community composition and functioning, though little is known about impacts on nearshore benthic bacteria. Globally, mudflats are hotspots for biogeochemical cycling, and expected climate change driven increases in terrestrial runoff to coastal areas have highlighted a need to understand the influence these inputs from land might have on Arctic estuarine tidal flat bacteria. In this study, I investigated microbial community composition and function in an estuarine tidal flat through a full melt season, using a combined approach of metabarcoding and carbon-source utilization assays under different salinity treatments. I found that bacterial communities varied through both space and time, as environmental conditions shifted due to riverine inputs and local processes, with salinity as a key structuring gradient. Arctic freshwater bacteria demonstrated higher capacities for degrading a wider range of carbon substrates than Arctic marine microbial communities, indicating higher potential for degradation of complex terrestrially derived organic material in freshwater systems. Terrestrial and riverine taxa were transported with melt water and deposited in sediments, composing up to 60% of sequences in downstream communities. However, their unique functional capabilities appear to be inhibited by the high salinities found in subtidal mudflats, and the highest potential for utilization of terrestrially derived organic matter may be limited to areas where sediments are permeated by freshwater. With anticipated increases in riverine discharge and permafrost thaw in a warming Arctic, tidal flats will likely be more frequently inundated with freshwater and the resident bacteria will have increased access to bioavailable terrestrial organic matter, extending the region where terrestrial organic ... Master Thesis Arctic Climate change permafrost University of Tromsø: Munin Open Research Archive Arctic |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Basic biosciences: 470::Molecular biology: 473 VDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Molekylærbiologi: 473 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Basic biosciences: 470::General microbiology: 472 VDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472 BIO-3950 |
spellingShingle |
VDP::Mathematics and natural science: 400::Basic biosciences: 470::Molecular biology: 473 VDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Molekylærbiologi: 473 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Basic biosciences: 470::General microbiology: 472 VDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472 BIO-3950 Handler, Eleanor Ruth Melt season dynamics in a High Arctic estuarine tidal flat: A microbial perspective |
topic_facet |
VDP::Mathematics and natural science: 400::Basic biosciences: 470::Molecular biology: 473 VDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Molekylærbiologi: 473 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 VDP::Mathematics and natural science: 400::Basic biosciences: 470::General microbiology: 472 VDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472 BIO-3950 |
description |
The substantial influx of freshwater to High Arctic coastal ecosystems influences nutrient, organic matter, and sediment dynamics, stratification, and light availability throughout the melt season. These changes shape pelagic microbial community composition and functioning, though little is known about impacts on nearshore benthic bacteria. Globally, mudflats are hotspots for biogeochemical cycling, and expected climate change driven increases in terrestrial runoff to coastal areas have highlighted a need to understand the influence these inputs from land might have on Arctic estuarine tidal flat bacteria. In this study, I investigated microbial community composition and function in an estuarine tidal flat through a full melt season, using a combined approach of metabarcoding and carbon-source utilization assays under different salinity treatments. I found that bacterial communities varied through both space and time, as environmental conditions shifted due to riverine inputs and local processes, with salinity as a key structuring gradient. Arctic freshwater bacteria demonstrated higher capacities for degrading a wider range of carbon substrates than Arctic marine microbial communities, indicating higher potential for degradation of complex terrestrially derived organic material in freshwater systems. Terrestrial and riverine taxa were transported with melt water and deposited in sediments, composing up to 60% of sequences in downstream communities. However, their unique functional capabilities appear to be inhibited by the high salinities found in subtidal mudflats, and the highest potential for utilization of terrestrially derived organic matter may be limited to areas where sediments are permeated by freshwater. With anticipated increases in riverine discharge and permafrost thaw in a warming Arctic, tidal flats will likely be more frequently inundated with freshwater and the resident bacteria will have increased access to bioavailable terrestrial organic matter, extending the region where terrestrial organic ... |
format |
Master Thesis |
author |
Handler, Eleanor Ruth |
author_facet |
Handler, Eleanor Ruth |
author_sort |
Handler, Eleanor Ruth |
title |
Melt season dynamics in a High Arctic estuarine tidal flat: A microbial perspective |
title_short |
Melt season dynamics in a High Arctic estuarine tidal flat: A microbial perspective |
title_full |
Melt season dynamics in a High Arctic estuarine tidal flat: A microbial perspective |
title_fullStr |
Melt season dynamics in a High Arctic estuarine tidal flat: A microbial perspective |
title_full_unstemmed |
Melt season dynamics in a High Arctic estuarine tidal flat: A microbial perspective |
title_sort |
melt season dynamics in a high arctic estuarine tidal flat: a microbial perspective |
publisher |
UiT Norges arktiske universitet |
publishDate |
2022 |
url |
https://hdl.handle.net/10037/25746 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost |
genre_facet |
Arctic Climate change permafrost |
op_relation |
https://hdl.handle.net/10037/25746 |
op_rights |
Copyright 2022 The Author(s) |
_version_ |
1766320987062665216 |