Phytoplanktonic DOC and POC production in the Bransfield and Gerlache Straits as derived from kinetic experiments of 14C incorporation

Xosé Anxelu G. Morán; Marta Estrada

doi:10.1016/S0967-0645(01)00123-0

Phytoplanktonic DOC and POC production in the Bransfield and Gerlache Straits as derived from kinetic experiments of ¹⁴C incorporation

Xosé Anxelu G. Morán^*, Marta Estrada

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

The production rates of DOC and POC by phytoplankton during the FRUELA 95 cruise were estimated by means of time-course experiments of ¹⁴C-bicarbonate incorporation. A three-compartment carbon exchange model was used to avoid the artifacts that may appear in end-point experiments due to heterotrophic removal of recently released DOC. The study area was classified into three regions with different ecological characteristics: Bransfield Strait, Gerlache Strait and the Gerlache-Bransfield Confluence (GB Confluence). Percent extracellular release (PER) for all stations ranged from 3% to 47%, with an average of 24%. In surface (5 m depth) waters, POC and DOC production rates were higher in Gerlache Strait than in the GB Confluence and Bransfield Strait. PER values followed an opposite trend, with an average of 26% in Bransfield Strait, 17% in the GB Confluence and 13% in Gerlache Strait. In Gerlache Strait, PER at 10 m depth was significantly higher than at the surface. With pooled data from all experiments, there was a positive relationship between DOC and POC production rates (log-log), but the slope significantly smaller than 1.0 indicated an inverse trend between PER and primary production rate. Phytoplanktonically produced DOC appeared to meet carbon requirements of heterotrophic prokaryotes in the whole area. A positive relationship between prokaryotic heterotrophic production and DOC production rate was found only in Bransfield Strait. These differences are discussed in relationship with the ecological characteristics of the different regions.

Original language	English (US)
Pages (from-to)	769-786
Number of pages	18
Journal	Deep-Sea Research Part II: Topical Studies in Oceanography
Volume	49
Issue number	4-5
DOIs	https://doi.org/10.1016/S0967-0645(01)00123-0
State	Published - 2002
Externally published	Yes

Bibliographical note

Funding Information:
We thank J.M. Gasol, C. Pedrós-Alió and D. Vaqué and two referees for critical review of the manuscript. We are also grateful to D. Vaqué and N. Guixa-Boixereu for the measurements of prokaryotic production and the crew of the R/V Hespérides for their help during the cruise. X.A.G.M. aknowledges the receipt of a FPI fellowship from the Spanish Ministry of Education. This work was supported by CICYT grant ANT94-1010.

ASJC Scopus subject areas

Oceanography

Access to Document

10.1016/S0967-0645(01)00123-0

Cite this

@article{bd26f62b30e34bf59ad8f62a5763ccb2,

title = "Phytoplanktonic DOC and POC production in the Bransfield and Gerlache Straits as derived from kinetic experiments of 14C incorporation",

abstract = "The production rates of DOC and POC by phytoplankton during the FRUELA 95 cruise were estimated by means of time-course experiments of 14C-bicarbonate incorporation. A three-compartment carbon exchange model was used to avoid the artifacts that may appear in end-point experiments due to heterotrophic removal of recently released DOC. The study area was classified into three regions with different ecological characteristics: Bransfield Strait, Gerlache Strait and the Gerlache-Bransfield Confluence (GB Confluence). Percent extracellular release (PER) for all stations ranged from 3% to 47%, with an average of 24%. In surface (5 m depth) waters, POC and DOC production rates were higher in Gerlache Strait than in the GB Confluence and Bransfield Strait. PER values followed an opposite trend, with an average of 26% in Bransfield Strait, 17% in the GB Confluence and 13% in Gerlache Strait. In Gerlache Strait, PER at 10 m depth was significantly higher than at the surface. With pooled data from all experiments, there was a positive relationship between DOC and POC production rates (log-log), but the slope significantly smaller than 1.0 indicated an inverse trend between PER and primary production rate. Phytoplanktonically produced DOC appeared to meet carbon requirements of heterotrophic prokaryotes in the whole area. A positive relationship between prokaryotic heterotrophic production and DOC production rate was found only in Bransfield Strait. These differences are discussed in relationship with the ecological characteristics of the different regions.",

author = "Mor{\'a}n, {Xos{\'e} Anxelu G.} and Marta Estrada",

note = "Funding Information: We thank J.M. Gasol, C. Pedr{\'o}s-Ali{\'o} and D. Vaqu{\'e} and two referees for critical review of the manuscript. We are also grateful to D. Vaqu{\'e} and N. Guixa-Boixereu for the measurements of prokaryotic production and the crew of the R/V Hesp{\'e}rides for their help during the cruise. X.A.G.M. aknowledges the receipt of a FPI fellowship from the Spanish Ministry of Education. This work was supported by CICYT grant ANT94-1010.",

year = "2002",

doi = "10.1016/S0967-0645(01)00123-0",

language = "English (US)",

volume = "49",

pages = "769--786",

journal = "Deep-Sea Research Part II: Topical Studies in Oceanography",

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T1 - Phytoplanktonic DOC and POC production in the Bransfield and Gerlache Straits as derived from kinetic experiments of 14C incorporation

AU - Morán, Xosé Anxelu G.

AU - Estrada, Marta

N1 - Funding Information: We thank J.M. Gasol, C. Pedrós-Alió and D. Vaqué and two referees for critical review of the manuscript. We are also grateful to D. Vaqué and N. Guixa-Boixereu for the measurements of prokaryotic production and the crew of the R/V Hespérides for their help during the cruise. X.A.G.M. aknowledges the receipt of a FPI fellowship from the Spanish Ministry of Education. This work was supported by CICYT grant ANT94-1010.

PY - 2002

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N2 - The production rates of DOC and POC by phytoplankton during the FRUELA 95 cruise were estimated by means of time-course experiments of 14C-bicarbonate incorporation. A three-compartment carbon exchange model was used to avoid the artifacts that may appear in end-point experiments due to heterotrophic removal of recently released DOC. The study area was classified into three regions with different ecological characteristics: Bransfield Strait, Gerlache Strait and the Gerlache-Bransfield Confluence (GB Confluence). Percent extracellular release (PER) for all stations ranged from 3% to 47%, with an average of 24%. In surface (5 m depth) waters, POC and DOC production rates were higher in Gerlache Strait than in the GB Confluence and Bransfield Strait. PER values followed an opposite trend, with an average of 26% in Bransfield Strait, 17% in the GB Confluence and 13% in Gerlache Strait. In Gerlache Strait, PER at 10 m depth was significantly higher than at the surface. With pooled data from all experiments, there was a positive relationship between DOC and POC production rates (log-log), but the slope significantly smaller than 1.0 indicated an inverse trend between PER and primary production rate. Phytoplanktonically produced DOC appeared to meet carbon requirements of heterotrophic prokaryotes in the whole area. A positive relationship between prokaryotic heterotrophic production and DOC production rate was found only in Bransfield Strait. These differences are discussed in relationship with the ecological characteristics of the different regions.

AB - The production rates of DOC and POC by phytoplankton during the FRUELA 95 cruise were estimated by means of time-course experiments of 14C-bicarbonate incorporation. A three-compartment carbon exchange model was used to avoid the artifacts that may appear in end-point experiments due to heterotrophic removal of recently released DOC. The study area was classified into three regions with different ecological characteristics: Bransfield Strait, Gerlache Strait and the Gerlache-Bransfield Confluence (GB Confluence). Percent extracellular release (PER) for all stations ranged from 3% to 47%, with an average of 24%. In surface (5 m depth) waters, POC and DOC production rates were higher in Gerlache Strait than in the GB Confluence and Bransfield Strait. PER values followed an opposite trend, with an average of 26% in Bransfield Strait, 17% in the GB Confluence and 13% in Gerlache Strait. In Gerlache Strait, PER at 10 m depth was significantly higher than at the surface. With pooled data from all experiments, there was a positive relationship between DOC and POC production rates (log-log), but the slope significantly smaller than 1.0 indicated an inverse trend between PER and primary production rate. Phytoplanktonically produced DOC appeared to meet carbon requirements of heterotrophic prokaryotes in the whole area. A positive relationship between prokaryotic heterotrophic production and DOC production rate was found only in Bransfield Strait. These differences are discussed in relationship with the ecological characteristics of the different regions.

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