Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean
Phytoplankton species composition and the associated community size structure are expected to change with a warming and freshening of the Arctic Ocean. Cell size controls many physiological (bottom-up) processes, such as nutrient uptake, photosynthesis and growth, thereby affecting the functioning o...
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ftawi:oai:epic.awi.de:50684 2024-09-15T17:50:00+00:00 Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean Lampe, Vanessa Nöthig, Eva-Maria Schartau, Markus 2019-01 https://epic.awi.de/id/eprint/50684/ https://hdl.handle.net/10013/epic.c01e78ae-1912-428f-a267-df75990ba237 unknown Lampe, V. , Nöthig, E. M. orcid:0000-0002-7527-7827 and Schartau, M. (2019) Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean , Changing Arctic Ocean Annual Science Meeting 2109, Birmingham, UK, 15 January 2019 - 17 January 2019 . hdl:10013/epic.c01e78ae-1912-428f-a267-df75990ba237 EPIC3Changing Arctic Ocean Annual Science Meeting 2109, Birmingham, UK, 2019-01-15-2019-01-17Birmingham Conference notRev 2019 ftawi 2024-06-24T04:23:24Z Phytoplankton species composition and the associated community size structure are expected to change with a warming and freshening of the Arctic Ocean. Cell size controls many physiological (bottom-up) processes, such as nutrient uptake, photosynthesis and growth, thereby affecting the functioning of the planktonic ecosystem as a whole. Furthermore, predator-prey interaction (top-down control) is highly size dependent. The size structure of the phytoplankton community in the Fram Strait has been analysed, based on observations of cell abundance and size. Non- parametric size spectra are obtained from microscopic observations, using a statistical approach that also provides respective confidence intervals. A bootstrap approach is applied, with cell counts and size measurements being resampled respectively. Kernel density estimates (KDE) are derived for all resampled data sets. The collection of KDEs yield robust continuous descriptions of cell density versus cell size together with their confidence limits. With this approach we resolve detailed changes in community size structure that shall be used to improve and constrain results of a size-based plankton ecosystem model. Size dependencies of bottom-up and top-down effects on biogeochemical mass flux will be investigated. The calibrated model can then be applied for deriving reliable projections of how the planktonic ecosystem in the Arctic may be affected by climate change. Conference Object Arctic Arctic Ocean Climate change Fram Strait Phytoplankton Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Phytoplankton species composition and the associated community size structure are expected to change with a warming and freshening of the Arctic Ocean. Cell size controls many physiological (bottom-up) processes, such as nutrient uptake, photosynthesis and growth, thereby affecting the functioning of the planktonic ecosystem as a whole. Furthermore, predator-prey interaction (top-down control) is highly size dependent. The size structure of the phytoplankton community in the Fram Strait has been analysed, based on observations of cell abundance and size. Non- parametric size spectra are obtained from microscopic observations, using a statistical approach that also provides respective confidence intervals. A bootstrap approach is applied, with cell counts and size measurements being resampled respectively. Kernel density estimates (KDE) are derived for all resampled data sets. The collection of KDEs yield robust continuous descriptions of cell density versus cell size together with their confidence limits. With this approach we resolve detailed changes in community size structure that shall be used to improve and constrain results of a size-based plankton ecosystem model. Size dependencies of bottom-up and top-down effects on biogeochemical mass flux will be investigated. The calibrated model can then be applied for deriving reliable projections of how the planktonic ecosystem in the Arctic may be affected by climate change. |
format |
Conference Object |
author |
Lampe, Vanessa Nöthig, Eva-Maria Schartau, Markus |
spellingShingle |
Lampe, Vanessa Nöthig, Eva-Maria Schartau, Markus Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean |
author_facet |
Lampe, Vanessa Nöthig, Eva-Maria Schartau, Markus |
author_sort |
Lampe, Vanessa |
title |
Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean |
title_short |
Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean |
title_full |
Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean |
title_fullStr |
Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean |
title_full_unstemmed |
Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean |
title_sort |
measuring the smallest - phytoplankton size spectra in a changing arctic ocean |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/50684/ https://hdl.handle.net/10013/epic.c01e78ae-1912-428f-a267-df75990ba237 |
genre |
Arctic Arctic Ocean Climate change Fram Strait Phytoplankton |
genre_facet |
Arctic Arctic Ocean Climate change Fram Strait Phytoplankton |
op_source |
EPIC3Changing Arctic Ocean Annual Science Meeting 2109, Birmingham, UK, 2019-01-15-2019-01-17Birmingham |
op_relation |
Lampe, V. , Nöthig, E. M. orcid:0000-0002-7527-7827 and Schartau, M. (2019) Measuring the smallest - phytoplankton size spectra in a Changing Arctic Ocean , Changing Arctic Ocean Annual Science Meeting 2109, Birmingham, UK, 15 January 2019 - 17 January 2019 . hdl:10013/epic.c01e78ae-1912-428f-a267-df75990ba237 |
_version_ |
1810291845599592448 |