Seasonal patterns in nutrient bioavailability in boreal headwater streams
Changes in nutrient bioavailability due to increased loading of dissolved organic matter (DOM) may impact boreal freshwaters. Yet, the relative bioavailability of carbon (C), nitrogen (N), and phosphorus (P) associated with terrestrial DOM remains poorly understood. We applied short-term bioassays w...
Published in: | Limnology and Oceanography |
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Online Access: | https://lup.lub.lu.se/record/449b86ed-da6a-4727-9513-31040a88022a https://doi.org/10.1002/lno.12064 |
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ftulundlup:oai:lup.lub.lu.se:449b86ed-da6a-4727-9513-31040a88022a 2023-05-15T17:44:57+02:00 Seasonal patterns in nutrient bioavailability in boreal headwater streams Rulli, Mayra Bergström, Ann-Kristin Sponseller, Ryan A. Berggren, Martin 2022-03-19 https://lup.lub.lu.se/record/449b86ed-da6a-4727-9513-31040a88022a https://doi.org/10.1002/lno.12064 eng eng ASLO https://lup.lub.lu.se/record/449b86ed-da6a-4727-9513-31040a88022a http://dx.doi.org/10.1002/lno.12064 scopus:85126488980 Limnology and Oceanography; pp 1-15 (2022) ISSN: 1939-5590 Physical Geography Geochemistry Dissolved organic matter Terrestrial dissolved organic matter Seasonality Nutrient bioavailability heterotrophic bacteria Boreal Streams DOC DON DOP contributiontojournal/article info:eu-repo/semantics/article text 2022 ftulundlup https://doi.org/10.1002/lno.12064 2023-02-01T23:38:27Z Changes in nutrient bioavailability due to increased loading of dissolved organic matter (DOM) may impact boreal freshwaters. Yet, the relative bioavailability of carbon (C), nitrogen (N), and phosphorus (P) associated with terrestrial DOM remains poorly understood. We applied short-term bioassays with natural bacterial inocula to determine seasonal variation in bioavailable organic nutrient pools from four boreal headwater streams in northern Sweden. Experiments were designed to exhaust bioavailable nutrients associated with DOM by inducing limiting conditions when all required resources except for the targeted nutrient (C, N, or P) are provided in excess. We hypothesized that the supply of different bioavailable nutrients to streams would reflect seasonal variations in terrestrial demand, hydrology, and temperature. The delivery of bioavailable DOM-associated resources from the four streams were, on average, 2%, 11%, and 38% of the total dissolved organic C, N, and P, respectively, emphasizing the relatively low C bioavailability in these DOM-rich waters. Bioavailable N : P ratios peaked in autumn for all sites, with lower values in winter and spring. Both in terms of relative (% of total) and absolute bioavailable organic nutrient concentrations, the seasonal pattern was characterized by systematically high values for the autumn period. Furthermore, links between bioavailable resources and temperature and hydrology varied across sites, time periods, and the different elements. Thus, elevated concentrations of bioavailable organic resources in autumn suggest the potential for leaf fall, as well as late season storms that rewet dry soils, to serve as considerable sources of C, N, and P to boreal aquatic ecosystems. Article in Journal/Newspaper Northern Sweden Lund University Publications (LUP) Limnology and Oceanography |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Physical Geography Geochemistry Dissolved organic matter Terrestrial dissolved organic matter Seasonality Nutrient bioavailability heterotrophic bacteria Boreal Streams DOC DON DOP |
spellingShingle |
Physical Geography Geochemistry Dissolved organic matter Terrestrial dissolved organic matter Seasonality Nutrient bioavailability heterotrophic bacteria Boreal Streams DOC DON DOP Rulli, Mayra Bergström, Ann-Kristin Sponseller, Ryan A. Berggren, Martin Seasonal patterns in nutrient bioavailability in boreal headwater streams |
topic_facet |
Physical Geography Geochemistry Dissolved organic matter Terrestrial dissolved organic matter Seasonality Nutrient bioavailability heterotrophic bacteria Boreal Streams DOC DON DOP |
description |
Changes in nutrient bioavailability due to increased loading of dissolved organic matter (DOM) may impact boreal freshwaters. Yet, the relative bioavailability of carbon (C), nitrogen (N), and phosphorus (P) associated with terrestrial DOM remains poorly understood. We applied short-term bioassays with natural bacterial inocula to determine seasonal variation in bioavailable organic nutrient pools from four boreal headwater streams in northern Sweden. Experiments were designed to exhaust bioavailable nutrients associated with DOM by inducing limiting conditions when all required resources except for the targeted nutrient (C, N, or P) are provided in excess. We hypothesized that the supply of different bioavailable nutrients to streams would reflect seasonal variations in terrestrial demand, hydrology, and temperature. The delivery of bioavailable DOM-associated resources from the four streams were, on average, 2%, 11%, and 38% of the total dissolved organic C, N, and P, respectively, emphasizing the relatively low C bioavailability in these DOM-rich waters. Bioavailable N : P ratios peaked in autumn for all sites, with lower values in winter and spring. Both in terms of relative (% of total) and absolute bioavailable organic nutrient concentrations, the seasonal pattern was characterized by systematically high values for the autumn period. Furthermore, links between bioavailable resources and temperature and hydrology varied across sites, time periods, and the different elements. Thus, elevated concentrations of bioavailable organic resources in autumn suggest the potential for leaf fall, as well as late season storms that rewet dry soils, to serve as considerable sources of C, N, and P to boreal aquatic ecosystems. |
format |
Article in Journal/Newspaper |
author |
Rulli, Mayra Bergström, Ann-Kristin Sponseller, Ryan A. Berggren, Martin |
author_facet |
Rulli, Mayra Bergström, Ann-Kristin Sponseller, Ryan A. Berggren, Martin |
author_sort |
Rulli, Mayra |
title |
Seasonal patterns in nutrient bioavailability in boreal headwater streams |
title_short |
Seasonal patterns in nutrient bioavailability in boreal headwater streams |
title_full |
Seasonal patterns in nutrient bioavailability in boreal headwater streams |
title_fullStr |
Seasonal patterns in nutrient bioavailability in boreal headwater streams |
title_full_unstemmed |
Seasonal patterns in nutrient bioavailability in boreal headwater streams |
title_sort |
seasonal patterns in nutrient bioavailability in boreal headwater streams |
publisher |
ASLO |
publishDate |
2022 |
url |
https://lup.lub.lu.se/record/449b86ed-da6a-4727-9513-31040a88022a https://doi.org/10.1002/lno.12064 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Limnology and Oceanography; pp 1-15 (2022) ISSN: 1939-5590 |
op_relation |
https://lup.lub.lu.se/record/449b86ed-da6a-4727-9513-31040a88022a http://dx.doi.org/10.1002/lno.12064 scopus:85126488980 |
op_doi |
https://doi.org/10.1002/lno.12064 |
container_title |
Limnology and Oceanography |
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1766147267057680384 |