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

Bell, TG, Malin, G, Kim, Y-N and Steinke, M (2007) Spatial variability in DMSP-lyase activity along an Atlantic meridional transect. Aquatic Sciences, 69 (3). pp. 320-329.

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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 ρ = −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.

Item Type: Article
Uncontrolled Keywords: dmsp-lyase activity,dmsp,dms,oxidative stress,oligotrophic,atlantic meridional transect
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Rosie Cullington
Date Deposited: 26 Feb 2011 18:37
Last Modified: 27 Nov 2018 15:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/25050
DOI: 10.1007/s00027-007-0894-1

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