Skip to content

Hydrological controls on glacially exported microbial assemblages

Research output: Contribution to journalArticle

Standard

Hydrological controls on glacially exported microbial assemblages. / Dubnick, Ashley; Kazemi, Sina; Sharp, Martin; Wadham, Jemma; Hawkings, Jon; Beaton, Alexander; Lanoil, Brian.

In: Journal of Geophysical Research: Biogeosciences, Vol. 122, No. 5, 05.2017, p. 1049-1061.

Research output: Contribution to journalArticle

Harvard

Dubnick, A, Kazemi, S, Sharp, M, Wadham, J, Hawkings, J, Beaton, A & Lanoil, B 2017, 'Hydrological controls on glacially exported microbial assemblages', Journal of Geophysical Research: Biogeosciences, vol. 122, no. 5, pp. 1049-1061. https://doi.org/10.1002/2016JG003685

APA

Dubnick, A., Kazemi, S., Sharp, M., Wadham, J., Hawkings, J., Beaton, A., & Lanoil, B. (2017). Hydrological controls on glacially exported microbial assemblages. Journal of Geophysical Research: Biogeosciences, 122(5), 1049-1061. https://doi.org/10.1002/2016JG003685

Vancouver

Dubnick A, Kazemi S, Sharp M, Wadham J, Hawkings J, Beaton A et al. Hydrological controls on glacially exported microbial assemblages. Journal of Geophysical Research: Biogeosciences. 2017 May;122(5):1049-1061. https://doi.org/10.1002/2016JG003685

Author

Dubnick, Ashley ; Kazemi, Sina ; Sharp, Martin ; Wadham, Jemma ; Hawkings, Jon ; Beaton, Alexander ; Lanoil, Brian. / Hydrological controls on glacially exported microbial assemblages. In: Journal of Geophysical Research: Biogeosciences. 2017 ; Vol. 122, No. 5. pp. 1049-1061.

Bibtex

@article{d805f75e8e164693a43d836548d12b1e,
title = "Hydrological controls on glacially exported microbial assemblages",
abstract = "The Greenland Ice Sheet (GrIS) exports approximately 400 km3 of freshwater annually to downstream freshwater and marine ecosystems. These meltwaters originate in a wide range of well-defined habitats that can be associated with very different physical environments within the ice sheet, ranging from oxygenated surface environments that are exposed to light and supplied with nutrients from atmospheric/aeolian sources to subglacial environments that are permanently dark, isolated from the atmosphere, and potentially anoxic. Hydrological conditions in the latter likely favor prolonged rock-water contact. The seasonally evolving hydrological system that drains meltwaters from the GrIS connects these distinct microbial habitats and exports the microbes contained within them to downstream ecosystems. The microbial assemblages exported in glacier meltwater may have an impact on downstream ecosystem function and development. We explored how the seasonal development of a glacial drainage system influences the character of microbial assemblages exported from the GrIS by monitoring the seasonal changes in hydrology, water chemistry, and microbial assemblage composition of meltwaters draining from a glacier in southwest Greenland. We found that the microbial assemblages exported in meltwaters varied in response to glacier hydrological flow path characteristics. Whether or not meltwaters passed through the subglacial environment was the first-order control on the composition of the microbial assemblages exported from the glacier, while water source (i.e., supraglacial or extraglacial) and subglacial residence times were second-order controls. Glacier hydrology therefore plays a fundamental role in determining the microbial exports from glaciated watersheds.",
keywords = "16S rRNA gene sequencing, bacteria, Greenland, hydrology, subglacial",
author = "Ashley Dubnick and Sina Kazemi and Martin Sharp and Jemma Wadham and Jon Hawkings and Alexander Beaton and Brian Lanoil",
year = "2017",
month = "5",
doi = "10.1002/2016JG003685",
language = "English",
volume = "122",
pages = "1049--1061",
journal = "Journal of Geophysical Research: Biogeosciences",
issn = "2169-8953",
publisher = "American Geophysical Union",
number = "5",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Hydrological controls on glacially exported microbial assemblages

AU - Dubnick, Ashley

AU - Kazemi, Sina

AU - Sharp, Martin

AU - Wadham, Jemma

AU - Hawkings, Jon

AU - Beaton, Alexander

AU - Lanoil, Brian

PY - 2017/5

Y1 - 2017/5

N2 - The Greenland Ice Sheet (GrIS) exports approximately 400 km3 of freshwater annually to downstream freshwater and marine ecosystems. These meltwaters originate in a wide range of well-defined habitats that can be associated with very different physical environments within the ice sheet, ranging from oxygenated surface environments that are exposed to light and supplied with nutrients from atmospheric/aeolian sources to subglacial environments that are permanently dark, isolated from the atmosphere, and potentially anoxic. Hydrological conditions in the latter likely favor prolonged rock-water contact. The seasonally evolving hydrological system that drains meltwaters from the GrIS connects these distinct microbial habitats and exports the microbes contained within them to downstream ecosystems. The microbial assemblages exported in glacier meltwater may have an impact on downstream ecosystem function and development. We explored how the seasonal development of a glacial drainage system influences the character of microbial assemblages exported from the GrIS by monitoring the seasonal changes in hydrology, water chemistry, and microbial assemblage composition of meltwaters draining from a glacier in southwest Greenland. We found that the microbial assemblages exported in meltwaters varied in response to glacier hydrological flow path characteristics. Whether or not meltwaters passed through the subglacial environment was the first-order control on the composition of the microbial assemblages exported from the glacier, while water source (i.e., supraglacial or extraglacial) and subglacial residence times were second-order controls. Glacier hydrology therefore plays a fundamental role in determining the microbial exports from glaciated watersheds.

AB - The Greenland Ice Sheet (GrIS) exports approximately 400 km3 of freshwater annually to downstream freshwater and marine ecosystems. These meltwaters originate in a wide range of well-defined habitats that can be associated with very different physical environments within the ice sheet, ranging from oxygenated surface environments that are exposed to light and supplied with nutrients from atmospheric/aeolian sources to subglacial environments that are permanently dark, isolated from the atmosphere, and potentially anoxic. Hydrological conditions in the latter likely favor prolonged rock-water contact. The seasonally evolving hydrological system that drains meltwaters from the GrIS connects these distinct microbial habitats and exports the microbes contained within them to downstream ecosystems. The microbial assemblages exported in glacier meltwater may have an impact on downstream ecosystem function and development. We explored how the seasonal development of a glacial drainage system influences the character of microbial assemblages exported from the GrIS by monitoring the seasonal changes in hydrology, water chemistry, and microbial assemblage composition of meltwaters draining from a glacier in southwest Greenland. We found that the microbial assemblages exported in meltwaters varied in response to glacier hydrological flow path characteristics. Whether or not meltwaters passed through the subglacial environment was the first-order control on the composition of the microbial assemblages exported from the glacier, while water source (i.e., supraglacial or extraglacial) and subglacial residence times were second-order controls. Glacier hydrology therefore plays a fundamental role in determining the microbial exports from glaciated watersheds.

KW - 16S rRNA gene sequencing

KW - bacteria

KW - Greenland

KW - hydrology

KW - subglacial

UR - http://www.scopus.com/inward/record.url?scp=85018387230&partnerID=8YFLogxK

U2 - 10.1002/2016JG003685

DO - 10.1002/2016JG003685

M3 - Article

AN - SCOPUS:85018387230

VL - 122

SP - 1049

EP - 1061

JO - Journal of Geophysical Research: Biogeosciences

JF - Journal of Geophysical Research: Biogeosciences

SN - 2169-8953

IS - 5

ER -