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Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity?
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| Zeitschriftentitel: | Journal of Geophysical Research: Oceans |
|---|---|
| Personen und Körperschaften: | , |
| In: | Journal of Geophysical Research: Oceans, 114, 2009, C2 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Kudela, Raphael M. Peterson, Tawnya D. Kudela, Raphael M. Peterson, Tawnya D. |
|---|---|
| author |
Kudela, Raphael M. Peterson, Tawnya D. |
| spellingShingle |
Kudela, Raphael M. Peterson, Tawnya D. Journal of Geophysical Research: Oceans Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
kudela, raphael m. |
| spelling |
Kudela, Raphael M. Peterson, Tawnya D. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2008jc004913 <jats:p>The influence of the Columbia River plume on phytoplankton rates and biomass accumulation was examined using multiday deckboard incubations as part of the coastal ocean processes River Influences on Shelf Ecosystems field program in August 2005. At a set of five stations encompassing the near‐field plume (three stations) on the Oregon and Washington coasts, treatments consisting of control, added nitrate, and added nitrate with 0.45 <jats:italic>μ</jats:italic>m filtered plume water were used to assess the phytoplankton community response to macronutrients and micronutrients. For a subset of these stations, nutrient (nitrate, ammonium, and ammonium inhibition of nitrate) kinetics were obtained, as well as carbon‐based estimates of productivity. For all experiments, nitrogen (nitrate) was clearly controlling both biomass accumulation and growth rates. Despite the apparent poleward trend toward increasing biomass in this region, there were no obvious differences in phytoplankton physiological capacity, nor were there any symptoms of iron limitation in the short term. We conclude that phytoplankton in this region are predominantly nitrogen limited but that upon release from this limiting factor, phosphorous and/or silicic acid (in waters not influenced by the Columbia River plume) would quickly become limiting. Evidence suggests that the mesoscale differences in phytoplankton biomass between the Oregon and Washington coasts result from a combination of enhanced grazing downstream and the physically retentive and dispersive effects of the plume itself.</jats:p> Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? Journal of Geophysical Research: Oceans |
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10.1029/2008jc004913 |
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Physik Technik Geologie und Paläontologie Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie Allgemeine Naturwissenschaft |
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| title |
Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_unstemmed |
Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_full |
Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_fullStr |
Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_full_unstemmed |
Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_short |
Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_sort |
influence of a buoyant river plume on phytoplankton nutrient dynamics: what controls standing stocks and productivity? |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| url |
http://dx.doi.org/10.1029/2008jc004913 |
| publishDate |
2009 |
| physical |
|
| description |
<jats:p>The influence of the Columbia River plume on phytoplankton rates and biomass accumulation was examined using multiday deckboard incubations as part of the coastal ocean processes River Influences on Shelf Ecosystems field program in August 2005. At a set of five stations encompassing the near‐field plume (three stations) on the Oregon and Washington coasts, treatments consisting of control, added nitrate, and added nitrate with 0.45 <jats:italic>μ</jats:italic>m filtered plume water were used to assess the phytoplankton community response to macronutrients and micronutrients. For a subset of these stations, nutrient (nitrate, ammonium, and ammonium inhibition of nitrate) kinetics were obtained, as well as carbon‐based estimates of productivity. For all experiments, nitrogen (nitrate) was clearly controlling both biomass accumulation and growth rates. Despite the apparent poleward trend toward increasing biomass in this region, there were no obvious differences in phytoplankton physiological capacity, nor were there any symptoms of iron limitation in the short term. We conclude that phytoplankton in this region are predominantly nitrogen limited but that upon release from this limiting factor, phosphorous and/or silicic acid (in waters not influenced by the Columbia River plume) would quickly become limiting. Evidence suggests that the mesoscale differences in phytoplankton biomass between the Oregon and Washington coasts result from a combination of enhanced grazing downstream and the physically retentive and dispersive effects of the plume itself.</jats:p> |
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| author | Kudela, Raphael M., Peterson, Tawnya D. |
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| description | <jats:p>The influence of the Columbia River plume on phytoplankton rates and biomass accumulation was examined using multiday deckboard incubations as part of the coastal ocean processes River Influences on Shelf Ecosystems field program in August 2005. At a set of five stations encompassing the near‐field plume (three stations) on the Oregon and Washington coasts, treatments consisting of control, added nitrate, and added nitrate with 0.45 <jats:italic>μ</jats:italic>m filtered plume water were used to assess the phytoplankton community response to macronutrients and micronutrients. For a subset of these stations, nutrient (nitrate, ammonium, and ammonium inhibition of nitrate) kinetics were obtained, as well as carbon‐based estimates of productivity. For all experiments, nitrogen (nitrate) was clearly controlling both biomass accumulation and growth rates. Despite the apparent poleward trend toward increasing biomass in this region, there were no obvious differences in phytoplankton physiological capacity, nor were there any symptoms of iron limitation in the short term. We conclude that phytoplankton in this region are predominantly nitrogen limited but that upon release from this limiting factor, phosphorous and/or silicic acid (in waters not influenced by the Columbia River plume) would quickly become limiting. Evidence suggests that the mesoscale differences in phytoplankton biomass between the Oregon and Washington coasts result from a combination of enhanced grazing downstream and the physically retentive and dispersive effects of the plume itself.</jats:p> |
| doi_str_mv | 10.1029/2008jc004913 |
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| spelling | Kudela, Raphael M. Peterson, Tawnya D. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2008jc004913 <jats:p>The influence of the Columbia River plume on phytoplankton rates and biomass accumulation was examined using multiday deckboard incubations as part of the coastal ocean processes River Influences on Shelf Ecosystems field program in August 2005. At a set of five stations encompassing the near‐field plume (three stations) on the Oregon and Washington coasts, treatments consisting of control, added nitrate, and added nitrate with 0.45 <jats:italic>μ</jats:italic>m filtered plume water were used to assess the phytoplankton community response to macronutrients and micronutrients. For a subset of these stations, nutrient (nitrate, ammonium, and ammonium inhibition of nitrate) kinetics were obtained, as well as carbon‐based estimates of productivity. For all experiments, nitrogen (nitrate) was clearly controlling both biomass accumulation and growth rates. Despite the apparent poleward trend toward increasing biomass in this region, there were no obvious differences in phytoplankton physiological capacity, nor were there any symptoms of iron limitation in the short term. We conclude that phytoplankton in this region are predominantly nitrogen limited but that upon release from this limiting factor, phosphorous and/or silicic acid (in waters not influenced by the Columbia River plume) would quickly become limiting. Evidence suggests that the mesoscale differences in phytoplankton biomass between the Oregon and Washington coasts result from a combination of enhanced grazing downstream and the physically retentive and dispersive effects of the plume itself.</jats:p> Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? Journal of Geophysical Research: Oceans |
| spellingShingle | Kudela, Raphael M., Peterson, Tawnya D., Journal of Geophysical Research: Oceans, Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity?, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_full | Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_fullStr | Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_full_unstemmed | Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_short | Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| title_sort | influence of a buoyant river plume on phytoplankton nutrient dynamics: what controls standing stocks and productivity? |
| title_unstemmed | Influence of a buoyant river plume on phytoplankton nutrient dynamics: What controls standing stocks and productivity? |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/2008jc004913 |