Effects of Increasing Atmospheric Nitrogen Deposition and Dissolved Organic Matter on Phytoplankton in Boreal Lakes with Differing Nutrient Limitation Patterns
Boreal lake ecosystems in the U.S. have experienced enhanced nitrogen (N) deposition and increasing dissolved organic carbon concentrations. These changes can lead to N enrichment as well as affect water transparency and nutrient influx. To investigate the combined effects of N enrichment and changi...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:etd-2284 2023-06-11T04:17:14+02:00 Effects of Increasing Atmospheric Nitrogen Deposition and Dissolved Organic Matter on Phytoplankton in Boreal Lakes with Differing Nutrient Limitation Patterns Daggett, Carmen 2011-05-01T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/etd/1250 https://digitalcommons.library.umaine.edu/context/etd/article/2284/viewcontent/DaggettC2011.pdf unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/etd/1250 https://digitalcommons.library.umaine.edu/context/etd/article/2284/viewcontent/DaggettC2011.pdf Electronic Theses and Dissertations Taiga ecology Water nitrogen content Run-off Hydrologic cycle Biochemistry Fresh Water Studies Natural Resources and Conservation Terrestrial and Aquatic Ecology text 2011 ftmaineuniv 2023-05-04T18:01:08Z Boreal lake ecosystems in the U.S. have experienced enhanced nitrogen (N) deposition and increasing dissolved organic carbon concentrations. These changes can lead to N enrichment as well as affect water transparency and nutrient influx. To investigate the combined effects of N enrichment and changing DOM influx on phytoplankton in boreal lakes, we conducted a series of experiments in which we established a gradient of N concentrations, and tested the shading versus nutrient addition effects of DOM additions in a factorial design with the N gradient. Experiments were conducted in two lakes, one N limited and one N&P co-limited, both N&P additions are required to observe phytoplankton growth. As expected, N additions increased chlorophyll concentrations in the N limited lake, but not the N&P co-limited lake. While the shading effects of DOM did not alter chlorophyll concentrations, the nutrient enrichment effects of DOM strongly stimulated phytoplankton growth in both lakes, with chlorophyll concentrations more than double those in control treatments. Our results suggest that DOM influx will have widespread effects on phytoplankton biomass across boreal lakes and increases in atmospheric N deposition will only affect N-limited boreal lake ecosystems. Text taiga The University of Maine: DigitalCommons@UMaine Boreal Lake ENVELOPE(-127.670,-127.670,58.802,58.802) |
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The University of Maine: DigitalCommons@UMaine |
op_collection_id |
ftmaineuniv |
language |
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topic |
Taiga ecology Water nitrogen content Run-off Hydrologic cycle Biochemistry Fresh Water Studies Natural Resources and Conservation Terrestrial and Aquatic Ecology |
spellingShingle |
Taiga ecology Water nitrogen content Run-off Hydrologic cycle Biochemistry Fresh Water Studies Natural Resources and Conservation Terrestrial and Aquatic Ecology Daggett, Carmen Effects of Increasing Atmospheric Nitrogen Deposition and Dissolved Organic Matter on Phytoplankton in Boreal Lakes with Differing Nutrient Limitation Patterns |
topic_facet |
Taiga ecology Water nitrogen content Run-off Hydrologic cycle Biochemistry Fresh Water Studies Natural Resources and Conservation Terrestrial and Aquatic Ecology |
description |
Boreal lake ecosystems in the U.S. have experienced enhanced nitrogen (N) deposition and increasing dissolved organic carbon concentrations. These changes can lead to N enrichment as well as affect water transparency and nutrient influx. To investigate the combined effects of N enrichment and changing DOM influx on phytoplankton in boreal lakes, we conducted a series of experiments in which we established a gradient of N concentrations, and tested the shading versus nutrient addition effects of DOM additions in a factorial design with the N gradient. Experiments were conducted in two lakes, one N limited and one N&P co-limited, both N&P additions are required to observe phytoplankton growth. As expected, N additions increased chlorophyll concentrations in the N limited lake, but not the N&P co-limited lake. While the shading effects of DOM did not alter chlorophyll concentrations, the nutrient enrichment effects of DOM strongly stimulated phytoplankton growth in both lakes, with chlorophyll concentrations more than double those in control treatments. Our results suggest that DOM influx will have widespread effects on phytoplankton biomass across boreal lakes and increases in atmospheric N deposition will only affect N-limited boreal lake ecosystems. |
format |
Text |
author |
Daggett, Carmen |
author_facet |
Daggett, Carmen |
author_sort |
Daggett, Carmen |
title |
Effects of Increasing Atmospheric Nitrogen Deposition and Dissolved Organic Matter on Phytoplankton in Boreal Lakes with Differing Nutrient Limitation Patterns |
title_short |
Effects of Increasing Atmospheric Nitrogen Deposition and Dissolved Organic Matter on Phytoplankton in Boreal Lakes with Differing Nutrient Limitation Patterns |
title_full |
Effects of Increasing Atmospheric Nitrogen Deposition and Dissolved Organic Matter on Phytoplankton in Boreal Lakes with Differing Nutrient Limitation Patterns |
title_fullStr |
Effects of Increasing Atmospheric Nitrogen Deposition and Dissolved Organic Matter on Phytoplankton in Boreal Lakes with Differing Nutrient Limitation Patterns |
title_full_unstemmed |
Effects of Increasing Atmospheric Nitrogen Deposition and Dissolved Organic Matter on Phytoplankton in Boreal Lakes with Differing Nutrient Limitation Patterns |
title_sort |
effects of increasing atmospheric nitrogen deposition and dissolved organic matter on phytoplankton in boreal lakes with differing nutrient limitation patterns |
publisher |
DigitalCommons@UMaine |
publishDate |
2011 |
url |
https://digitalcommons.library.umaine.edu/etd/1250 https://digitalcommons.library.umaine.edu/context/etd/article/2284/viewcontent/DaggettC2011.pdf |
long_lat |
ENVELOPE(-127.670,-127.670,58.802,58.802) |
geographic |
Boreal Lake |
geographic_facet |
Boreal Lake |
genre |
taiga |
genre_facet |
taiga |
op_source |
Electronic Theses and Dissertations |
op_relation |
https://digitalcommons.library.umaine.edu/etd/1250 https://digitalcommons.library.umaine.edu/context/etd/article/2284/viewcontent/DaggettC2011.pdf |
_version_ |
1768376199126450176 |