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Spatial variability in DMSP-lyase activity along an Atlantic meridional transect

Spatial variability in DMSP-lyase activity along an Atlantic meridional transect
Spatial variability in DMSP-lyase activity along an Atlantic meridional transect
In vitro DMSP-lyase activity (DLA) measurements were made during an Atlantic Meridional Transect (AMT) cruise in May 2004, which travelled through the southern and northern oligotrophic gyres. Along the transect, twice-daily measurements were taken from the surface (0.5 ? 8.0 m) and the chlorophyll maximum (chl max; 47 ? 150 m). Surface samples showed a large variation in DLA (0 ? 58.6 nmol L?1 h?1), while values for the chl max were lower and less variable (0 ? 8.7 nmol L?1 h?1). A negative correlation was observed between DLA:TChl a and primary production (carbon fixation rate) in surface samples (Spearman’s ? = ?0.57, p < 0.05, n = 17). Nitracline depth and the ratio of photo-protective to photosynthetic accessory pigments indicate that, as expected, surface phytoplankton communities in the gyres experience low nutrient concentrations and high light levels in comparison to communities from the chl max. Comparing pre-dawn and late-morning surface DLA values provides a pseudo time-series for each day and, in areas with elevated DLA, values for the late-morning samples were consistently higher than those taken at pre-dawn. Our field data set covers a geographically extensive area and includes the first DLA analyses from the oligotrophic South Atlantic gyre.
DMSP-lyase activity, DMSP, DMS, Oxidative Stress, Oligotrophic, Atlantic Meridional Transect
1015-1621
320-329
Bell, T.G.
ac8e4a4a-da04-4087-b1c4-3d4137b90a53
Malin, G.
ea8cd4a7-641b-4519-9364-0fadcbd0d63c
Kim, Y-N.
507c2f5e-9843-496b-b198-f9b38e742803
Steinke, M.
63b9d219-967c-4b6c-9c5e-cfcadea63af1
Bell, T.G.
ac8e4a4a-da04-4087-b1c4-3d4137b90a53
Malin, G.
ea8cd4a7-641b-4519-9364-0fadcbd0d63c
Kim, Y-N.
507c2f5e-9843-496b-b198-f9b38e742803
Steinke, M.
63b9d219-967c-4b6c-9c5e-cfcadea63af1

Bell, T.G., Malin, G., Kim, Y-N. and Steinke, M. (2007) Spatial variability in DMSP-lyase activity along an Atlantic meridional transect. Aquatic Sciences, 69 (3), 320-329. (doi:10.1007/s00027-007-0894-1).

Record type: Article

Abstract

In vitro DMSP-lyase activity (DLA) measurements were made during an Atlantic Meridional Transect (AMT) cruise in May 2004, which travelled through the southern and northern oligotrophic gyres. Along the transect, twice-daily measurements were taken from the surface (0.5 ? 8.0 m) and the chlorophyll maximum (chl max; 47 ? 150 m). Surface samples showed a large variation in DLA (0 ? 58.6 nmol L?1 h?1), while values for the chl max were lower and less variable (0 ? 8.7 nmol L?1 h?1). A negative correlation was observed between DLA:TChl a and primary production (carbon fixation rate) in surface samples (Spearman’s ? = ?0.57, p < 0.05, n = 17). Nitracline depth and the ratio of photo-protective to photosynthetic accessory pigments indicate that, as expected, surface phytoplankton communities in the gyres experience low nutrient concentrations and high light levels in comparison to communities from the chl max. Comparing pre-dawn and late-morning surface DLA values provides a pseudo time-series for each day and, in areas with elevated DLA, values for the late-morning samples were consistently higher than those taken at pre-dawn. Our field data set covers a geographically extensive area and includes the first DLA analyses from the oligotrophic South Atlantic gyre.

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More information

Published date: September 2007
Keywords: DMSP-lyase activity, DMSP, DMS, Oxidative Stress, Oligotrophic, Atlantic Meridional Transect

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Local EPrints ID: 49656
URI: https://eprints.soton.ac.uk/id/eprint/49656
ISSN: 1015-1621
PURE UUID: e603d827-80bf-4a87-af81-62ec85bd4766

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Date deposited: 20 Nov 2007
Last modified: 13 Mar 2019 20:53

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Contributors

Author: T.G. Bell
Author: G. Malin
Author: Y-N. Kim
Author: M. Steinke

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