Assessing Drivers of Coastal Primary Production in Northern Marguerite Bay, Antarctica
The coastal ocean of the climatically-sensitive west Antarctic Peninsula is experiencing changes in the physical and (photo)chemical properties that strongly affect the phytoplankton. Consequently, a shift from diatoms, pivotal in the Antarctic food web, to more mobile and smaller flagellates has be...
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ftdoajarticles:oai:doaj.org/article:02f2420c98094a0185497325c345aaf2 2023-05-15T13:52:15+02:00 Assessing Drivers of Coastal Primary Production in Northern Marguerite Bay, Antarctica Patrick D. Rozema Gemma Kulk Michiel P. Veldhuis Anita G. J. Buma Michael P. Meredith Willem H. van de Poll 2017-06-01T00:00:00Z https://doi.org/10.3389/fmars.2017.00184 https://doaj.org/article/02f2420c98094a0185497325c345aaf2 EN eng Frontiers Media S.A. http://journal.frontiersin.org/article/10.3389/fmars.2017.00184/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2017.00184 https://doaj.org/article/02f2420c98094a0185497325c345aaf2 Frontiers in Marine Science, Vol 4 (2017) Antarctica sea ice primary production carbon phytoplankton diatoms Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2017 ftdoajarticles https://doi.org/10.3389/fmars.2017.00184 2022-12-31T14:23:25Z The coastal ocean of the climatically-sensitive west Antarctic Peninsula is experiencing changes in the physical and (photo)chemical properties that strongly affect the phytoplankton. Consequently, a shift from diatoms, pivotal in the Antarctic food web, to more mobile and smaller flagellates has been observed. We seek to identify the main drivers behind primary production (PP) without any assumptions beforehand to obtain the best possible model of PP. We employed a combination of field measurements and modeling to discern and quantify the influences of variability in physical, (photo)chemical, and biological parameters on PP in northern Marguerite Bay. Field data of high-temporal resolution (November 2013–March 2014) collected at a long-term monitoring site here were combined with estimates of PP derived from photosynthesis-irradiance incubations and modeled using mechanistic and statistical models. Daily PP varied greatly and averaged 1,764 mg C m−2 d−1 with a maximum of 6,908 mg C m−2 d−1 after the melting of sea ice and the likely release of diatoms concentrated therein. A non-assumptive random forest model (RF) with all possibly relevant parameters (MRFmax) showed that variability in PP was best explained by light availability and chlorophyll a followed by physical (temperature, mixed layer depth, and salinity) and chemical (phosphate, total nitrogen, and silicate) water column properties. The predictive power from the relative abundances of diatoms, cryptophytes, and haptophytes (as determined by pigment fingerprinting) to PP was minimal. However, the variability in PP due to changes in species composition was most likely underestimated due to the contrasting strategies of these phytoplankton groups as we observed significant negative relations between PP and the relative abundance of flagellates groups. Our reduced model (MRFmin) showed how light availability, chlorophyll a, and total nitrogen concentrations can be used to obtain the best estimate of PP (R2 = 0.93). The resulting estimates from our models ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) The Antarctic Frontiers in Marine Science 4 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctica sea ice primary production carbon phytoplankton diatoms Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
Antarctica sea ice primary production carbon phytoplankton diatoms Science Q General. Including nature conservation geographical distribution QH1-199.5 Patrick D. Rozema Gemma Kulk Michiel P. Veldhuis Anita G. J. Buma Michael P. Meredith Willem H. van de Poll Assessing Drivers of Coastal Primary Production in Northern Marguerite Bay, Antarctica |
topic_facet |
Antarctica sea ice primary production carbon phytoplankton diatoms Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
The coastal ocean of the climatically-sensitive west Antarctic Peninsula is experiencing changes in the physical and (photo)chemical properties that strongly affect the phytoplankton. Consequently, a shift from diatoms, pivotal in the Antarctic food web, to more mobile and smaller flagellates has been observed. We seek to identify the main drivers behind primary production (PP) without any assumptions beforehand to obtain the best possible model of PP. We employed a combination of field measurements and modeling to discern and quantify the influences of variability in physical, (photo)chemical, and biological parameters on PP in northern Marguerite Bay. Field data of high-temporal resolution (November 2013–March 2014) collected at a long-term monitoring site here were combined with estimates of PP derived from photosynthesis-irradiance incubations and modeled using mechanistic and statistical models. Daily PP varied greatly and averaged 1,764 mg C m−2 d−1 with a maximum of 6,908 mg C m−2 d−1 after the melting of sea ice and the likely release of diatoms concentrated therein. A non-assumptive random forest model (RF) with all possibly relevant parameters (MRFmax) showed that variability in PP was best explained by light availability and chlorophyll a followed by physical (temperature, mixed layer depth, and salinity) and chemical (phosphate, total nitrogen, and silicate) water column properties. The predictive power from the relative abundances of diatoms, cryptophytes, and haptophytes (as determined by pigment fingerprinting) to PP was minimal. However, the variability in PP due to changes in species composition was most likely underestimated due to the contrasting strategies of these phytoplankton groups as we observed significant negative relations between PP and the relative abundance of flagellates groups. Our reduced model (MRFmin) showed how light availability, chlorophyll a, and total nitrogen concentrations can be used to obtain the best estimate of PP (R2 = 0.93). The resulting estimates from our models ... |
format |
Article in Journal/Newspaper |
author |
Patrick D. Rozema Gemma Kulk Michiel P. Veldhuis Anita G. J. Buma Michael P. Meredith Willem H. van de Poll |
author_facet |
Patrick D. Rozema Gemma Kulk Michiel P. Veldhuis Anita G. J. Buma Michael P. Meredith Willem H. van de Poll |
author_sort |
Patrick D. Rozema |
title |
Assessing Drivers of Coastal Primary Production in Northern Marguerite Bay, Antarctica |
title_short |
Assessing Drivers of Coastal Primary Production in Northern Marguerite Bay, Antarctica |
title_full |
Assessing Drivers of Coastal Primary Production in Northern Marguerite Bay, Antarctica |
title_fullStr |
Assessing Drivers of Coastal Primary Production in Northern Marguerite Bay, Antarctica |
title_full_unstemmed |
Assessing Drivers of Coastal Primary Production in Northern Marguerite Bay, Antarctica |
title_sort |
assessing drivers of coastal primary production in northern marguerite bay, antarctica |
publisher |
Frontiers Media S.A. |
publishDate |
2017 |
url |
https://doi.org/10.3389/fmars.2017.00184 https://doaj.org/article/02f2420c98094a0185497325c345aaf2 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice |
op_source |
Frontiers in Marine Science, Vol 4 (2017) |
op_relation |
http://journal.frontiersin.org/article/10.3389/fmars.2017.00184/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2017.00184 https://doaj.org/article/02f2420c98094a0185497325c345aaf2 |
op_doi |
https://doi.org/10.3389/fmars.2017.00184 |
container_title |
Frontiers in Marine Science |
container_volume |
4 |
_version_ |
1766256529815633920 |