d13C and d15N composition of suspended particular organic matter (SPOM) and zooplankton in the eutrophic Scheldt estuary (Belgium) (poster)

De Brabandere, L.; Dehairs, F.A.; Dehairs, F.A.

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d¹³C and d¹⁵N composition of suspended particular organic matter (SPOM) and zooplankton in the eutrophic Scheldt estuary (Belgium) (poster)

De Brabandere, L.; Dehairs, F.A. (2002). d¹³C and d¹⁵N composition of suspended particular organic matter (SPOM) and zooplankton in the eutrophic Scheldt estuary (Belgium) (poster), in: Mees, J. et al. (Ed.) VLIZ Young Scientists' Day, Brugge, Belgium 13 March 2002: book of abstracts. VLIZ Special Publication, 7: pp. 32

In: Mees, J.; Seys, J. (Ed.) (2002). VLIZ Young Scientists' Day, Brugge, Belgium 13 March 2002: book of abstracts. VLIZ Special Publication, 7. Vlaams Instituut voor de Zee: Oostende. VI, 57 pp.

In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950

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VLIZ: Open access 237061 [ download pdf ]
Documenttype: Samenvatting

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Abstract

d¹³C and d¹⁵N were used to study food sources of zooplankton in the Scheldt Estuary. The SPOM carried by the river is a mixture of antropogenic and terrestrial detritus with associated bacteria and locally produced autotrophic organic matter. Samples of SPOM and zooplankton were taken monthly from June 1999 to April 2000 at four stations located along a salinity gradient (0-14 ppt). We investigated the relative importance of detritus, heterotrophic and autotrophic organic matter in the diet of zooplankton.Both d¹⁵N_SPOM and d¹³C_SPOM varied seasonally, paralleling the change in biomass of autotrophic organisms. Generally, phytoplankton bloom periods were characterised by high d¹⁵N_SPOM (maximum +12.9‰) and low d¹³C_SPOM values (minimum -31.1‰). Winter d¹⁵N_SPOM and d¹³C_SPOM values were characteristic for pure antropogenic/terrestrial detritus (d¹⁵N = +2.5‰; d¹³C = -26.8‰). The summer increase of d¹⁵N_SPOM was attributed to autotrophic consumption of NH₄⁺ strongly enriched in ¹⁵N due to intense nitrification. However, the seasonal pattern between the stations differed reflecting differences in the timing, duration and intensity of the phytoplankton bloom. d¹³C_zooplankton and d¹⁵N_zooplankton co-varied with d¹³C_SPOM and d¹⁵N_SPOM. The high deviation from the original d¹³C_SPOM and d¹⁵N_SPOM suggested selective feeding on specific components of the SPOM.

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