Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic
Climate change is rapidly reshaping Arctic landscapes through shifts in vegetation cover and productivity, soil resource mobilization, and hydrological regimes. The implications of these changes for stream ecosystems and food webs is unclear and will depend largely on microbial biofilm responses to...
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Online Access: | http://hdl.handle.net/10072/381750 https://doi.org/10.1111/gcb.14117 |
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ftgriffithuniv:oai:research-repository.griffith.edu.au:10072/381750 2023-05-15T14:50:22+02:00 Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic Myrstener, Maria Rocher-Ros, Gerard Burrows, Ryan Bergstrom, Ann-Kristin Giesler, Reiner Sponseller, Ryan 2018 http://hdl.handle.net/10072/381750 https://doi.org/10.1111/gcb.14117 English eng Wiley-Blackwell Publishing Global Change Biology Biological Sciences not elsewhere classified Biological Sciences Environmental Sciences Journal article 2018 ftgriffithuniv https://doi.org/10.1111/gcb.14117 2019-06-03T22:22:36Z Climate change is rapidly reshaping Arctic landscapes through shifts in vegetation cover and productivity, soil resource mobilization, and hydrological regimes. The implications of these changes for stream ecosystems and food webs is unclear and will depend largely on microbial biofilm responses to concurrent shifts in temperature, light, and resource supply from land. To study those responses, we used nutrient diffusing substrates to manipulate resource supply to biofilm communities along regional gradients in stream temperature, riparian shading, and dissolved organic carbon (DOC) loading in Arctic Sweden. We found strong nitrogen (N) limitation across this gradient for gross primary production, community respiration and chlorophyll‐a accumulation. For unamended biofilms, activity and biomass accrual were not closely related to any single physical or chemical driver across this region. However, the magnitude of biofilm response to N addition was: in tundra streams, biofilm response was constrained by thermal regimes, whereas variation in light availability regulated this response in birch and coniferous forest streams. Furthermore, heterotrophic responses to experimental N addition increased across the region with greater stream water concentrations of DOC relative to inorganic N. Thus, future shifts in resource supply to these ecosystems are likely to interact with other concurrent environmental changes to regulate stream productivity. Indeed, our results suggest that in the absence of increased nutrient inputs, Arctic streams will be less sensitive to future changes in other habitat variables such as temperature and DOC loading. No Full Text Article in Journal/Newspaper Arctic Climate change Tundra Griffith University: Griffith Research Online Arctic Global Change Biology 24 8 3680 3691 |
institution |
Open Polar |
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Griffith University: Griffith Research Online |
op_collection_id |
ftgriffithuniv |
language |
English |
topic |
Biological Sciences not elsewhere classified Biological Sciences Environmental Sciences |
spellingShingle |
Biological Sciences not elsewhere classified Biological Sciences Environmental Sciences Myrstener, Maria Rocher-Ros, Gerard Burrows, Ryan Bergstrom, Ann-Kristin Giesler, Reiner Sponseller, Ryan Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic |
topic_facet |
Biological Sciences not elsewhere classified Biological Sciences Environmental Sciences |
description |
Climate change is rapidly reshaping Arctic landscapes through shifts in vegetation cover and productivity, soil resource mobilization, and hydrological regimes. The implications of these changes for stream ecosystems and food webs is unclear and will depend largely on microbial biofilm responses to concurrent shifts in temperature, light, and resource supply from land. To study those responses, we used nutrient diffusing substrates to manipulate resource supply to biofilm communities along regional gradients in stream temperature, riparian shading, and dissolved organic carbon (DOC) loading in Arctic Sweden. We found strong nitrogen (N) limitation across this gradient for gross primary production, community respiration and chlorophyll‐a accumulation. For unamended biofilms, activity and biomass accrual were not closely related to any single physical or chemical driver across this region. However, the magnitude of biofilm response to N addition was: in tundra streams, biofilm response was constrained by thermal regimes, whereas variation in light availability regulated this response in birch and coniferous forest streams. Furthermore, heterotrophic responses to experimental N addition increased across the region with greater stream water concentrations of DOC relative to inorganic N. Thus, future shifts in resource supply to these ecosystems are likely to interact with other concurrent environmental changes to regulate stream productivity. Indeed, our results suggest that in the absence of increased nutrient inputs, Arctic streams will be less sensitive to future changes in other habitat variables such as temperature and DOC loading. No Full Text |
format |
Article in Journal/Newspaper |
author |
Myrstener, Maria Rocher-Ros, Gerard Burrows, Ryan Bergstrom, Ann-Kristin Giesler, Reiner Sponseller, Ryan |
author_facet |
Myrstener, Maria Rocher-Ros, Gerard Burrows, Ryan Bergstrom, Ann-Kristin Giesler, Reiner Sponseller, Ryan |
author_sort |
Myrstener, Maria |
title |
Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic |
title_short |
Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic |
title_full |
Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic |
title_fullStr |
Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic |
title_full_unstemmed |
Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic |
title_sort |
persistent nitrogen limitation of stream biofilm communities along climate gradients in the arctic |
publisher |
Wiley-Blackwell Publishing |
publishDate |
2018 |
url |
http://hdl.handle.net/10072/381750 https://doi.org/10.1111/gcb.14117 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Tundra |
genre_facet |
Arctic Climate change Tundra |
op_relation |
Global Change Biology |
op_doi |
https://doi.org/10.1111/gcb.14117 |
container_title |
Global Change Biology |
container_volume |
24 |
container_issue |
8 |
container_start_page |
3680 |
op_container_end_page |
3691 |
_version_ |
1766321405986603008 |