Abundance of a chlorophyll a precursor and the oxidation product hydroxychlorophyll a during seasonal phytoplankton community progression in the Western English Channel.

Steele, D. J., Tarran, G.A., Widdicombe, C.E., Woodward, E.M.S., Kimmance, S.A., Franklin, D. J. and Airs, R.L., 2015. Abundance of a chlorophyll a precursor and the oxidation product hydroxychlorophyll a during seasonal phytoplankton community progression in the Western English Channel. Progress in Oceanography, 137, 434 - 445 .

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DOI: 10.1016/j.pocean.2015.04.021

Abstract

This study presents the first in-situ measurements of the chlorophyll a oxidation product, hydroxychlorophyll a as well as the chlorophyll a precursor, chlorophyll a<inf>P276</inf> conducted over an annual cycle. Chlorophyll a oxidation products, such as hydroxychlorophyll a may be associated with the decline of algal populations and can act as an initial step in the degradation of chlorophyll a into products which can be found in the geochemical record, important for studying past climate change events. Here, hydroxychlorophyll a and chlorophyll a<inf>P276</inf> were measured at the long-term monitoring station L4, Western Channel Observatory (UK, www.westernchannelobservatory.org) over an annual cycle (2012). Weekly measurements of phytoplankton species composition and abundance enabled detailed analysis of possible sources of hydroxychlorophyll a. Dinoflagellates, 2 diatom species, the prymnesiophyte Phaeocystis spp. and the coccolithophorid Emiliania huxleyi were all associated with hydroxychlorophyll a occurrence. However, during alternate peaks in abundance of the diatoms, no association with hydroxychlorophyll a occurred, indicating that the oxidation of chlorophyll a was dependant not only on species but also on additional factors such as the mode of mortality, growth limiting factor (i.e. nutrient concentration) or phenotypic plasticity. Surface sediment samples contained 10 times more hydroxychlorophyll a (relative to chlorophyll a) than pelagic particulate samples, indicating that more chlorophyll a oxidation occurred during sedimentation or at the sediment-water interface, than in the pelagic environment. In addition, chlorophyll a<inf>P276</inf> correlated with chl-a concentration, thus supporting its assignment as a chl-a precursor.

Item Type:Article
ISSN:0079-6611
Subjects:UNSPECIFIED
Group:Faculty of Science and Technology
ID Code:22602
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:06 Oct 2015 14:00
Last Modified:06 Oct 2015 14:00

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