IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Printer-friendly version

Temporal variation in macrobenthic diet as inferred from fatty acid biomarkers
Braeckman, U.; Provoost, P.; Sabbe, K.; Middelburg, J.J.; Soetaert, K.; Vincx, M.; Vanaverbeke, J. (2011). Temporal variation in macrobenthic diet as inferred from fatty acid biomarkers, in: Braeckman, U. Macrobenthos structuring the sea floor: importance of its functional biodiversity for the benthic ecosystem = De structurerende rol van macrobenthos in de zeebodem: belang van de functionele biodiversiteit voor het benthische ecosysteem. pp. 103-130
In: Braeckman, U. (2011). Macrobenthos structuring the sea floor: importance of its functional biodiversity for the benthic ecosystem = De structurerende rol van macrobenthos in de zeebodem: belang van de functionele biodiversiteit voor het benthische ecosysteem. PhD Thesis. Marine Biology Research Group: Gent. ISBN 9789490695590. 239 pp., more

Available in Authors 
    VLIZ: Open Repository 221940 [ OMA ]

Keywords
    Algal blooms; Benthos; Biomarkers; Isotopes; Lipids; Phytoplankton; Lanice conchilega (Pallas, 1766) [WoRMS]; Nephtys hombergii Savigny in Lamarck, 1818 [WoRMS]; Marine

Authors  Top 

Abstract
    We investigated the temporal variation of pelagic and benthic food sources in the diet of two marine polychaetes: a macrobenthic omnivore (Nephtys hombergii) and a suspension-deposit feeder (Lanice conchilega) by means of fatty acid (FA) biomarkers and compound-specific stable isotope analysis (CSIA). FA biomarkers in the suspended particulate matter mirrored phytoplankton dynamics in the water column, consisting of a small diatom dominance early spring, succeeded by a mass Phaeocystis peak followed by a mixed diatom-dinoflagellate bloom. Deposition and subsequent bacterial degradation of the phytoplankton bloom were reflected in sediment FA biomarkers. The main distinction in FA biomarker concentration within macrobenthic tissue was observed at the species level (50% of variation), the diet of L. conchilega consisting of bacteria and diatoms and that of N. hombergii also of diatoms, but including more dinoflagellates and invertebrates. Temporal variation explained almost 20%: the two species retained more bacterial and Phaeocystis markers before the bloom, while they accumulated more polyunsaturated FA after the bloom. CSIA revealed increased accumulation or biosynthesis of poly-unsaturated FA from the suspended matter in L. conchilega upon bloom deposition, which is probably related to energy storage for gametogenesis. In contrast, bloom–dependent accumulation or biosynthesis of FA was not detected in N. hombergii

All data in IMIS is subject to the VLIZ privacy policy Top | Authors