The role of watershed characteristics, permafrost thaw, and wildfire on dissolved organic carbon biodegradability and water chemistry in Arctic headwater streams
International audience In the Alaskan Arctic, rapid climate change is increasing the frequency of disturbance including wildfire and permafrost collapse. These pulse disturbances may influence the delivery of dissolved organic carbon (DOC) to aquatic ecosystems, however the magnitude of these effect...
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ftunivrennes2hal:oai:HAL:hal-01231677v1 2024-05-12T07:59:19+00:00 The role of watershed characteristics, permafrost thaw, and wildfire on dissolved organic carbon biodegradability and water chemistry in Arctic headwater streams Larouche, Julia R. Abbott, Benjamin W. Bowden, William B. Jones, Jeremy B. Rubenstein School of Environment and Natural Resources University of Vermont Burlington Ecosystèmes, biodiversité, évolution Rennes (ECOBIO) Université de Rennes (UR)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) Institute of Arctic Biology University of Alaska Fairbanks (UAF) 2015-07-20 https://univ-rennes.hal.science/hal-01231677 https://univ-rennes.hal.science/hal-01231677/document https://univ-rennes.hal.science/hal-01231677/file/bg-12-4221-2015.pdf https://doi.org/10.5194/bg-12-4221-2015 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-12-4221-2015 hal-01231677 https://univ-rennes.hal.science/hal-01231677 https://univ-rennes.hal.science/hal-01231677/document https://univ-rennes.hal.science/hal-01231677/file/bg-12-4221-2015.pdf doi:10.5194/bg-12-4221-2015 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://univ-rennes.hal.science/hal-01231677 Biogeosciences, 2015, 12 (14), pp.4221-4233. ⟨10.5194/bg-12-4221-2015⟩ [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2015 ftunivrennes2hal https://doi.org/10.5194/bg-12-4221-2015 2024-04-17T16:18:08Z International audience In the Alaskan Arctic, rapid climate change is increasing the frequency of disturbance including wildfire and permafrost collapse. These pulse disturbances may influence the delivery of dissolved organic carbon (DOC) to aquatic ecosystems, however the magnitude of these effects compared to the natural background variability of DOC at the watershed scale is not well known.We measured DOC quantity, composition, and biodegradability from 14 river and stream reaches (watershed sizes ranging from 1.5–167 km2/ some of which were impacted by permafrost collapse (thermokarst) and fire. We found that region had a significant impact on quantity and biodegradability of DOC, likely driven by landscape and watershed characteristics such as lithology, soil and vegetation type, elevation, and glacial age. However,contrary to our hypothesis, we found that streams disturbed by thermokarst and fire did not contain significantly altered labile DOC fractions compared to adjacent reference waters, potentially due to rapid ecosystem recovery after fire and thermokarst as well as the limited spatial extent of thermokarst. Overall, biodegradable DOC ranged from 4 to 46% and contrary to patterns of DOC biodegradability in large Arctic rivers, seasonal variation in DOC biodegradability showed no clear pattern between sites, potentially related to stream geomorphology and position along the river network. While thermokarst and fire can alter DOC quantity and biodegradability at the scale of the feature, we conclude that tundra ecosystems are resilient to these types of disturbance. Article in Journal/Newspaper Arctic Climate change permafrost Thermokarst Tundra Archive Ouverte de l'Université Rennes (HAL) Arctic Biogeosciences 12 14 4221 4233 |
institution |
Open Polar |
collection |
Archive Ouverte de l'Université Rennes (HAL) |
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ftunivrennes2hal |
language |
English |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology Larouche, Julia R. Abbott, Benjamin W. Bowden, William B. Jones, Jeremy B. The role of watershed characteristics, permafrost thaw, and wildfire on dissolved organic carbon biodegradability and water chemistry in Arctic headwater streams |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience In the Alaskan Arctic, rapid climate change is increasing the frequency of disturbance including wildfire and permafrost collapse. These pulse disturbances may influence the delivery of dissolved organic carbon (DOC) to aquatic ecosystems, however the magnitude of these effects compared to the natural background variability of DOC at the watershed scale is not well known.We measured DOC quantity, composition, and biodegradability from 14 river and stream reaches (watershed sizes ranging from 1.5–167 km2/ some of which were impacted by permafrost collapse (thermokarst) and fire. We found that region had a significant impact on quantity and biodegradability of DOC, likely driven by landscape and watershed characteristics such as lithology, soil and vegetation type, elevation, and glacial age. However,contrary to our hypothesis, we found that streams disturbed by thermokarst and fire did not contain significantly altered labile DOC fractions compared to adjacent reference waters, potentially due to rapid ecosystem recovery after fire and thermokarst as well as the limited spatial extent of thermokarst. Overall, biodegradable DOC ranged from 4 to 46% and contrary to patterns of DOC biodegradability in large Arctic rivers, seasonal variation in DOC biodegradability showed no clear pattern between sites, potentially related to stream geomorphology and position along the river network. While thermokarst and fire can alter DOC quantity and biodegradability at the scale of the feature, we conclude that tundra ecosystems are resilient to these types of disturbance. |
author2 |
Rubenstein School of Environment and Natural Resources University of Vermont Burlington Ecosystèmes, biodiversité, évolution Rennes (ECOBIO) Université de Rennes (UR)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) Institute of Arctic Biology University of Alaska Fairbanks (UAF) |
format |
Article in Journal/Newspaper |
author |
Larouche, Julia R. Abbott, Benjamin W. Bowden, William B. Jones, Jeremy B. |
author_facet |
Larouche, Julia R. Abbott, Benjamin W. Bowden, William B. Jones, Jeremy B. |
author_sort |
Larouche, Julia R. |
title |
The role of watershed characteristics, permafrost thaw, and wildfire on dissolved organic carbon biodegradability and water chemistry in Arctic headwater streams |
title_short |
The role of watershed characteristics, permafrost thaw, and wildfire on dissolved organic carbon biodegradability and water chemistry in Arctic headwater streams |
title_full |
The role of watershed characteristics, permafrost thaw, and wildfire on dissolved organic carbon biodegradability and water chemistry in Arctic headwater streams |
title_fullStr |
The role of watershed characteristics, permafrost thaw, and wildfire on dissolved organic carbon biodegradability and water chemistry in Arctic headwater streams |
title_full_unstemmed |
The role of watershed characteristics, permafrost thaw, and wildfire on dissolved organic carbon biodegradability and water chemistry in Arctic headwater streams |
title_sort |
role of watershed characteristics, permafrost thaw, and wildfire on dissolved organic carbon biodegradability and water chemistry in arctic headwater streams |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://univ-rennes.hal.science/hal-01231677 https://univ-rennes.hal.science/hal-01231677/document https://univ-rennes.hal.science/hal-01231677/file/bg-12-4221-2015.pdf https://doi.org/10.5194/bg-12-4221-2015 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost Thermokarst Tundra |
genre_facet |
Arctic Climate change permafrost Thermokarst Tundra |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://univ-rennes.hal.science/hal-01231677 Biogeosciences, 2015, 12 (14), pp.4221-4233. ⟨10.5194/bg-12-4221-2015⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-12-4221-2015 hal-01231677 https://univ-rennes.hal.science/hal-01231677 https://univ-rennes.hal.science/hal-01231677/document https://univ-rennes.hal.science/hal-01231677/file/bg-12-4221-2015.pdf doi:10.5194/bg-12-4221-2015 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-12-4221-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
14 |
container_start_page |
4221 |
op_container_end_page |
4233 |
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