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Seasonal and interannual variation of the phytoplankton and copepod dynamics in Liverpool Bay

Seasonal and interannual variation of the phytoplankton and copepod dynamics in Liverpool Bay
Seasonal and interannual variation of the phytoplankton and copepod dynamics in Liverpool Bay
The seasonal and interannual variability in the phytoplankton community in Liverpool Bay between 2003 and 2009 has been examined using results from high frequency, in situ measurements combined with discrete samples collected at one location in the bay. The spring phytoplankton bloom (up to 29.4 mg chlorophyll m?3) is an annual feature at the study site and its timing may vary by up to 50 days between years. The variability in the underwater light climate and turbulent mixing are identified as key factors controlling the timing of phytoplankton blooms. Modelled average annual gross and net production are estimated to be 223 and 56 g C m?2 year?1, respectively. Light microscope counts showed that the phytoplankton community is dominated by diatoms, with dinoflagellates appearing annually for short periods of time between July and October. The zooplankton community at the study site is dominated by copepods and use of a fine mesh (80 ?m) resulted in higher abundances of copepods determined (up to 2.5×106 ind. m?2) than has previously reported for this location. There is a strong seasonal cycle in copepod biomass and copepods greater than 270 ?m contribute less than 10% of the total biomass. Seasonal trends in copepod biomass lag those in the phytoplankton community with a delay of 3 to 4 months between the maximum phytoplankton biomass and the maximum copepod biomass. Grazing by copepods exceeds net primary production at the site and indicates that an additional advective supply of carbon is required to support the copepod community.
1616-7341
307-320
Greenwood, Naomi
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Forster, Rodney M.
b89bd38e-169d-428d-a2e0-fb29b0eeeb9e
Créach, Veronique
e40e39d2-a046-4dd4-8ea1-e407c272d8c9
Painting, Suzanne J.
4b12dee1-f0c7-49fe-b1fd-9354b8fb910c
Dennis, Anna
b190a9de-2d9c-4381-8395-315bcb80f01a
Cutchey, Stewart J.
d40b31a6-0d95-4b90-81c5-d5408ed53543
Silva, Tiago
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Sivyer, David B.
ff4025e8-072e-4085-965c-7cc0a0d4ce0a
Jickells, Tim
094e5c61-cf45-464f-91e6-9727c9dcb0c0
Greenwood, Naomi
abfb0708-96a0-4c2b-bb0b-fd8339a9f7ed
Forster, Rodney M.
b89bd38e-169d-428d-a2e0-fb29b0eeeb9e
Créach, Veronique
e40e39d2-a046-4dd4-8ea1-e407c272d8c9
Painting, Suzanne J.
4b12dee1-f0c7-49fe-b1fd-9354b8fb910c
Dennis, Anna
b190a9de-2d9c-4381-8395-315bcb80f01a
Cutchey, Stewart J.
d40b31a6-0d95-4b90-81c5-d5408ed53543
Silva, Tiago
0f4c971a-fe50-49db-a64f-177c92713a44
Sivyer, David B.
ff4025e8-072e-4085-965c-7cc0a0d4ce0a
Jickells, Tim
094e5c61-cf45-464f-91e6-9727c9dcb0c0

Greenwood, Naomi, Forster, Rodney M., Créach, Veronique, Painting, Suzanne J., Dennis, Anna, Cutchey, Stewart J., Silva, Tiago, Sivyer, David B. and Jickells, Tim (2012) Seasonal and interannual variation of the phytoplankton and copepod dynamics in Liverpool Bay. Ocean Dynamics, 62 (2), 307-320. (doi:10.1007/s10236-011-0500-x).

Record type: Article

Abstract

The seasonal and interannual variability in the phytoplankton community in Liverpool Bay between 2003 and 2009 has been examined using results from high frequency, in situ measurements combined with discrete samples collected at one location in the bay. The spring phytoplankton bloom (up to 29.4 mg chlorophyll m?3) is an annual feature at the study site and its timing may vary by up to 50 days between years. The variability in the underwater light climate and turbulent mixing are identified as key factors controlling the timing of phytoplankton blooms. Modelled average annual gross and net production are estimated to be 223 and 56 g C m?2 year?1, respectively. Light microscope counts showed that the phytoplankton community is dominated by diatoms, with dinoflagellates appearing annually for short periods of time between July and October. The zooplankton community at the study site is dominated by copepods and use of a fine mesh (80 ?m) resulted in higher abundances of copepods determined (up to 2.5×106 ind. m?2) than has previously reported for this location. There is a strong seasonal cycle in copepod biomass and copepods greater than 270 ?m contribute less than 10% of the total biomass. Seasonal trends in copepod biomass lag those in the phytoplankton community with a delay of 3 to 4 months between the maximum phytoplankton biomass and the maximum copepod biomass. Grazing by copepods exceeds net primary production at the site and indicates that an additional advective supply of carbon is required to support the copepod community.

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Published date: 2012
Organisations: Marine Systems Modelling

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Local EPrints ID: 210980
URI: https://eprints.soton.ac.uk/id/eprint/210980
ISSN: 1616-7341
PURE UUID: 8a74e03f-61e4-4d84-842a-dda5ba150072

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Date deposited: 16 Feb 2012 10:57
Last modified: 18 Jul 2017 10:44

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Contributors

Author: Naomi Greenwood
Author: Rodney M. Forster
Author: Veronique Créach
Author: Suzanne J. Painting
Author: Anna Dennis
Author: Stewart J. Cutchey
Author: Tiago Silva
Author: David B. Sivyer
Author: Tim Jickells

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