Journal Title
Title of Journal: Mar Biol
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Abbravation: Marine Biology
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Publisher
Springer-Verlag
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Authors: P Mayzaud M Boutoute M Noyon F Narcy S Gasparini
Publish Date: 2012/11/08
Volume: 160, Issue: 2, Pages: 383-398
Abstract
The total lipids and fatty acid composition of natural particulate matter and nutritional quality for zooplankton grazers was studied on a seasonal basis in the Arctic fjord Kongsfjorden Svalbard during the spring summer of 2007 and during the early summer of 2006 Both years were abnormally warm and the study attempted to evaluate the potential impact of the intrusion of North Atlantic waters Samples were collected in surface layers and at deep chlorophyll maximum DCM when present Both years chlorophyll concentrations were low 2 μg L−1 even during bloom periods Species determination indicated Phaeocystis spp as main constituent of the May bloom while ciliates and flagellates dominated the rest of the survey period Total lipids showed similar changes at both depths with maximum values in midsummer of 2007 while it showed reverse patterns between surface and DCM in 2006 Total fatty acid composition was dominated by saturates and monoenoic acids at both depths with significant percentages of pentaenoic acids and 226n3 DHA recorded at all times The 2007 fatty acid dynamics identified four main successions in term of particulate assemblage related mainly to the succession of living cells versus detrital material and to a lesser extent to phytoplankton community changes diatoms versus nondiatoms Redundancy analysis confirmed that live phytoplankton is one of the main drivers in the fatty acid changes Temperature and density of the surface water are also influential in relation to water mass dynamics Concentrations of fatty acids available to consumers showed n3 PUFA ranging from 2 to 15 μg L−1 and n6 PUFA ranging from 03 to 2 μg L−1 Concentration of EPA 205 and DHA are potentially limiting suggesting a negative impact of Phaeocystis pouchettitype phytoplankton linked to advection of Atlantic waters in relation to global warming of Arctic watersSupport to the field work provided by Kings Bay A S AWIPEV and NPI was greatly appreciated This work was part of the PRACEAL project no 455 funded by the French Polar Institute Paul Emile Victor IPEV and INSUCNRS The authors thank Prof Else N Hegseth University of Tromso for supplying her monthly nutrient data corresponding to our survey
Keywords:
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