Assessment of photosynthesis in a spring cyanobacterial bloom by use of a fast repetition rate fluorometer
Estimates of gross primary production (GPP) based on fast repetition rate fluorometer (FRRF) measurements were compared with independent 14 C and O 2 at three stations during a spring bloom in the North Atlantic. A photosynthesis versus irradiance (P‐E) curve was constructed for each station from th...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.2001.46.4.0802 2024-06-23T07:55:14+00:00 Assessment of photosynthesis in a spring cyanobacterial bloom by use of a fast repetition rate fluorometer Suggett, David Kraay, Gijsbert Holligan, Patrick Davey, Margaret Aiken, Jim Geider, Richard 2001 http://dx.doi.org/10.4319/lo.2001.46.4.0802 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2001.46.4.0802 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2001.46.4.0802 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 46, issue 4, page 802-810 ISSN 0024-3590 1939-5590 journal-article 2001 crwiley https://doi.org/10.4319/lo.2001.46.4.0802 2024-06-13T04:25:24Z Estimates of gross primary production (GPP) based on fast repetition rate fluorometer (FRRF) measurements were compared with independent 14 C and O 2 at three stations during a spring bloom in the North Atlantic. A photosynthesis versus irradiance (P‐E) curve was constructed for each station from the observations of in situ photon efficiency of photosynthesis. This composite P‐E curve was compared with P‐E curves determined for discrete samples from 14 C assimilation. Estimates of a Chl and Pm Chl from the 14 C‐uptake method were 1.5–2.5‐fold lower than those estimated from the FRRF data. Much of this discrepancy can be accounted for if 14 C assimilation approximates net phytoplankton photosynthesis with use of a photosynthetic quotient of 1.4 mol O 2 (mol CO 2 ) −1 . Photosynthetic oxygen consumption may have also contributed to the difference. In situ GPP was calculated from incident irradiance, light attenuation, light absorption by phytoplankton, and the light dependence of the in situ photon efficiency. This estimate of GPP was two times greater than net community photosynthesis determined from diel changes of in situ oxygen concentration. Thus, the in situ net O 2 and in vitro 14 C techniques yielded similar estimates of phytoplankton photosynthesis that were about twofold lower than the estimates of GPP provided by FRRF. Uncertainties in the FRRF technique associated with choosing an appropriate value of photosynthetic unit size and fitting a P‐E curve to the in situ measurements are discussed. Despite these uncertainties, the FRRF results were consistent with the independent estimates of phytoplankton productivity. Article in Journal/Newspaper North Atlantic Wiley Online Library Limnology and Oceanography 46 4 802 810 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Estimates of gross primary production (GPP) based on fast repetition rate fluorometer (FRRF) measurements were compared with independent 14 C and O 2 at three stations during a spring bloom in the North Atlantic. A photosynthesis versus irradiance (P‐E) curve was constructed for each station from the observations of in situ photon efficiency of photosynthesis. This composite P‐E curve was compared with P‐E curves determined for discrete samples from 14 C assimilation. Estimates of a Chl and Pm Chl from the 14 C‐uptake method were 1.5–2.5‐fold lower than those estimated from the FRRF data. Much of this discrepancy can be accounted for if 14 C assimilation approximates net phytoplankton photosynthesis with use of a photosynthetic quotient of 1.4 mol O 2 (mol CO 2 ) −1 . Photosynthetic oxygen consumption may have also contributed to the difference. In situ GPP was calculated from incident irradiance, light attenuation, light absorption by phytoplankton, and the light dependence of the in situ photon efficiency. This estimate of GPP was two times greater than net community photosynthesis determined from diel changes of in situ oxygen concentration. Thus, the in situ net O 2 and in vitro 14 C techniques yielded similar estimates of phytoplankton photosynthesis that were about twofold lower than the estimates of GPP provided by FRRF. Uncertainties in the FRRF technique associated with choosing an appropriate value of photosynthetic unit size and fitting a P‐E curve to the in situ measurements are discussed. Despite these uncertainties, the FRRF results were consistent with the independent estimates of phytoplankton productivity. |
format |
Article in Journal/Newspaper |
author |
Suggett, David Kraay, Gijsbert Holligan, Patrick Davey, Margaret Aiken, Jim Geider, Richard |
spellingShingle |
Suggett, David Kraay, Gijsbert Holligan, Patrick Davey, Margaret Aiken, Jim Geider, Richard Assessment of photosynthesis in a spring cyanobacterial bloom by use of a fast repetition rate fluorometer |
author_facet |
Suggett, David Kraay, Gijsbert Holligan, Patrick Davey, Margaret Aiken, Jim Geider, Richard |
author_sort |
Suggett, David |
title |
Assessment of photosynthesis in a spring cyanobacterial bloom by use of a fast repetition rate fluorometer |
title_short |
Assessment of photosynthesis in a spring cyanobacterial bloom by use of a fast repetition rate fluorometer |
title_full |
Assessment of photosynthesis in a spring cyanobacterial bloom by use of a fast repetition rate fluorometer |
title_fullStr |
Assessment of photosynthesis in a spring cyanobacterial bloom by use of a fast repetition rate fluorometer |
title_full_unstemmed |
Assessment of photosynthesis in a spring cyanobacterial bloom by use of a fast repetition rate fluorometer |
title_sort |
assessment of photosynthesis in a spring cyanobacterial bloom by use of a fast repetition rate fluorometer |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.4319/lo.2001.46.4.0802 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2001.46.4.0802 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2001.46.4.0802 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Limnology and Oceanography volume 46, issue 4, page 802-810 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2001.46.4.0802 |
container_title |
Limnology and Oceanography |
container_volume |
46 |
container_issue |
4 |
container_start_page |
802 |
op_container_end_page |
810 |
_version_ |
1802647737558106112 |