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Impacts of phytoplankton activity on dissolved nitrogen fluxes in the tidal reaches and estuary of the Tweed (North East UK)

Impacts of phytoplankton activity on dissolved nitrogen fluxes in the tidal reaches and estuary of the Tweed (North East UK)
Impacts of phytoplankton activity on dissolved nitrogen fluxes in the tidal reaches and estuary of the Tweed (North East UK)
Monthly surveys were conducted from April to August 1997 to quantify the uptake of dissolved nitrogen species (nitrate, ammonium and urea) and oxygen production in the tidal reaches and estuary of the Tweed. 15N isotope labelling was used in conjunction with in situ incubation methods to determine the uptake of dissolved nitrogen in surface water samples. Respiration, gross and net oxygen production were measured simultaneously. Phytoplankton activity in the Tweed resulted in low rates of dissolved nitrogen uptake (<0.4 nmol N l?1 h?1) and caused small changes in the dissolved oxygen concentration. Uptake of nitrate and urea was associated with phytoplankton biomass and was highest during periods of net autotrophic production (May, June and August). Reductions in the total downstream fluxes of dissolved nitrogen due to phytoplankton activity were appreciable despite the low rates of uptake of dissolved nitrogen and were found to be strongly dependent on the flushing time of the estuary
0025-326X
280-294
Shaw, P.J.
935dfebf-9fb6-483c-86da-a21dba8c1989
Chapron, C.A.
74442fa7-87cc-4ca3-a654-243cfd3b48db
Purdie, D.A.
18820b32-185a-467a-8019-01f245191cd8
Rees, A.P.
5cc3b9f5-8e06-4364-9137-6fa171faa4e8
Shaw, P.J.
935dfebf-9fb6-483c-86da-a21dba8c1989
Chapron, C.A.
74442fa7-87cc-4ca3-a654-243cfd3b48db
Purdie, D.A.
18820b32-185a-467a-8019-01f245191cd8
Rees, A.P.
5cc3b9f5-8e06-4364-9137-6fa171faa4e8

Shaw, P.J., Chapron, C.A., Purdie, D.A. and Rees, A.P. (1998) Impacts of phytoplankton activity on dissolved nitrogen fluxes in the tidal reaches and estuary of the Tweed (North East UK). Marine Pollution Bulletin, 37 (3-7), 280-294. (doi:10.1016/S0025-326X(99)00032-6).

Record type: Article

Abstract

Monthly surveys were conducted from April to August 1997 to quantify the uptake of dissolved nitrogen species (nitrate, ammonium and urea) and oxygen production in the tidal reaches and estuary of the Tweed. 15N isotope labelling was used in conjunction with in situ incubation methods to determine the uptake of dissolved nitrogen in surface water samples. Respiration, gross and net oxygen production were measured simultaneously. Phytoplankton activity in the Tweed resulted in low rates of dissolved nitrogen uptake (<0.4 nmol N l?1 h?1) and caused small changes in the dissolved oxygen concentration. Uptake of nitrate and urea was associated with phytoplankton biomass and was highest during periods of net autotrophic production (May, June and August). Reductions in the total downstream fluxes of dissolved nitrogen due to phytoplankton activity were appreciable despite the low rates of uptake of dissolved nitrogen and were found to be strongly dependent on the flushing time of the estuary

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Published date: March 1998

Identifiers

Local EPrints ID: 75737
URI: http://eprints.soton.ac.uk/id/eprint/75737
ISSN: 0025-326X
PURE UUID: 3d48647e-aa0e-4f21-a3a1-b02eb968d0cd
ORCID for P.J. Shaw: ORCID iD orcid.org/0000-0003-0925-5010
ORCID for D.A. Purdie: ORCID iD orcid.org/0000-0001-6672-1722

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 16 Nov 2021 02:33

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Contributors

Author: P.J. Shaw ORCID iD
Author: C.A. Chapron
Author: D.A. Purdie ORCID iD
Author: A.P. Rees

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