Biofilm growth in two streams draining mountainous permafrost catchments in NE Greenland
The objective of this study was to evaluate how stream water nutrient concentrations influence biofilm accrual in streams draining mountainous permafrost headwaters. We selected six stream locations in the Zackenberg area (NE Greenland, 74ºN) subjected to a gradient in the areal contribution of diff...
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ftdatacite:10.21994/loar4108 2023-05-15T14:57:08+02:00 Biofilm growth in two streams draining mountainous permafrost catchments in NE Greenland Pastor, Ada Wu, Naicheng Skovsholt, Louis J. Riis, Tenna 2020 https://dx.doi.org/10.21994/loar4108 https://loar.kb.dk/handle/1902/4295 en eng Royal Danish Library Attribution-NonCommercial 2.5 Denmark http://creativecommons.org/licenses/by-nc/2.5/dk/ CC-BY-NC Biofilm Chlorophyll Carbon Nitrogen Stream CreativeWork article 2020 ftdatacite https://doi.org/10.21994/loar4108 2021-11-05T12:55:41Z The objective of this study was to evaluate how stream water nutrient concentrations influence biofilm accrual in streams draining mountainous permafrost headwaters. We selected six stream locations in the Zackenberg area (NE Greenland, 74ºN) subjected to a gradient in the areal contribution of different geomorphological units in the watersheds and channel stability. We used nutrient diffusing substrates to evaluate biofilm growth (autotrophic and total biomass). We found elevated stream nitrate concentrations in samples from upstream reaches draining larger areas of solifluction sheets and bare rock and with higher channel instability. Nitrate had the highest standardized effect on autotrophic biofilm growth on control discs. However, stream biofilm growth was not nutrient limited as shown by the absence of an increase in biofilm biomass as a response to the experimental nutrient additions. The response to nutrient additions via diffusing substrates depended on the altitude gradient. Overall, our results showed stream nitrogen availability to be one of the main drivers of algal biofilm accrual in high-Arctic streams, suggesting that the predicted changes in nutrient exports induced by climate change will have strong impacts on the biogeochemistry and ecological functioning of high-Arctic streams Article in Journal/Newspaper Arctic Climate change Greenland permafrost Zackenberg DataCite Metadata Store (German National Library of Science and Technology) Arctic Greenland Bare Rock ENVELOPE(-45.589,-45.589,-60.704,-60.704) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Biofilm Chlorophyll Carbon Nitrogen Stream |
spellingShingle |
Biofilm Chlorophyll Carbon Nitrogen Stream Pastor, Ada Wu, Naicheng Skovsholt, Louis J. Riis, Tenna Biofilm growth in two streams draining mountainous permafrost catchments in NE Greenland |
topic_facet |
Biofilm Chlorophyll Carbon Nitrogen Stream |
description |
The objective of this study was to evaluate how stream water nutrient concentrations influence biofilm accrual in streams draining mountainous permafrost headwaters. We selected six stream locations in the Zackenberg area (NE Greenland, 74ºN) subjected to a gradient in the areal contribution of different geomorphological units in the watersheds and channel stability. We used nutrient diffusing substrates to evaluate biofilm growth (autotrophic and total biomass). We found elevated stream nitrate concentrations in samples from upstream reaches draining larger areas of solifluction sheets and bare rock and with higher channel instability. Nitrate had the highest standardized effect on autotrophic biofilm growth on control discs. However, stream biofilm growth was not nutrient limited as shown by the absence of an increase in biofilm biomass as a response to the experimental nutrient additions. The response to nutrient additions via diffusing substrates depended on the altitude gradient. Overall, our results showed stream nitrogen availability to be one of the main drivers of algal biofilm accrual in high-Arctic streams, suggesting that the predicted changes in nutrient exports induced by climate change will have strong impacts on the biogeochemistry and ecological functioning of high-Arctic streams |
format |
Article in Journal/Newspaper |
author |
Pastor, Ada Wu, Naicheng Skovsholt, Louis J. Riis, Tenna |
author_facet |
Pastor, Ada Wu, Naicheng Skovsholt, Louis J. Riis, Tenna |
author_sort |
Pastor, Ada |
title |
Biofilm growth in two streams draining mountainous permafrost catchments in NE Greenland |
title_short |
Biofilm growth in two streams draining mountainous permafrost catchments in NE Greenland |
title_full |
Biofilm growth in two streams draining mountainous permafrost catchments in NE Greenland |
title_fullStr |
Biofilm growth in two streams draining mountainous permafrost catchments in NE Greenland |
title_full_unstemmed |
Biofilm growth in two streams draining mountainous permafrost catchments in NE Greenland |
title_sort |
biofilm growth in two streams draining mountainous permafrost catchments in ne greenland |
publisher |
Royal Danish Library |
publishDate |
2020 |
url |
https://dx.doi.org/10.21994/loar4108 https://loar.kb.dk/handle/1902/4295 |
long_lat |
ENVELOPE(-45.589,-45.589,-60.704,-60.704) |
geographic |
Arctic Greenland Bare Rock |
geographic_facet |
Arctic Greenland Bare Rock |
genre |
Arctic Climate change Greenland permafrost Zackenberg |
genre_facet |
Arctic Climate change Greenland permafrost Zackenberg |
op_rights |
Attribution-NonCommercial 2.5 Denmark http://creativecommons.org/licenses/by-nc/2.5/dk/ |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.21994/loar4108 |
_version_ |
1766329222643580928 |