ABSTRACT: Between January 1995 and August 1996, suspended matter and zooplankton were sampled at different locations in a mangrove ecosystem located in the Gautami Godavari estuary and adjacent Kakinada Bay (Andhra Pradesh, India). Suspended matter was sampled at 13 different stations, and was found to have a highly variable carbon stable isotope composition, with d13C values ranging overall between -30.94 and -19.18[per thou], and a highly variable elemental (C:N) composition. Our data suggest that the phytoplankton component has a seasonally and spatially variable d13C signature, which is surpressed by the terrestrial signal but may at times fall in the same range as the d13C of the allochtonous matter. It is argued that the phytoplankton d13C decreases after the onset of the monsoon rains, most likely due to the ¹³C-depletion of the DIC pool caused by the microbial respiration of the allochtonous organic matter. At each of the 4 sites selected for concurrent zooplankton sampling, the zooplankton showed a much wider range of d13C than did the suspended matter, with overall d13C values between -30.14 and -16.45[per thou]. In addition, spatial differences in average d13C were much more pronounced for zooplankton than for total suspended matter. These data indicate that zooplankton feed on a component of the suspended matter pool, which has more pronounced seasonal and spatial d13C variations than the total suspended matter. Thus, despite the large amounts of terrestrial and mangrove detritus present in the water column, the locally produced phytoplankton appears to be a more important carbon source for the zooplankton.

KEY WORDS: Selective feeding · Mangroves · Zooplankton · Suspended organic matter · Phytoplankton · Stable isotopes

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Published in MEPS Vol. 208 (2000) on December 8
ISSN: 0171-8630. Copyright © Inter-Research, Oldendorf/Luhe, 2000