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  • 1
    ISSN: 1573-5117
    Keywords: mangroves ; east coast of India ; Penaeus sp.. ; stablecarbon isotope ratios ; nurseries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Godavari estuarine system extending over approximately316 km2 has significant annual variation of salinity dueto seasonal flooding which is mainly monsoon fed. This areahas dense vegetation of mangroves and is characterised bypredominance of Avicennia sp. Excoecaria agallochaand Rhizophora sp. In the coastal waters adjacent to themangroves three economically important species of prawns occur(Penaeus monodon, P. indicus and Metapenaeusmonoceros). Their larvae migrate and dwell in the mangroveenvironment. By analysis for the natural stable carbon isotoperatios, it was possible to establish the primary carbon sourcefrom the mangroves to that of larvae and juveniles of P. indicus and P. monodon. This information can be usedto exploit the mangrove habitat as prawnnurseries.
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  • 2
    ISSN: 1573-5117
    Keywords: Stable isotope tracers ; carbon ; nitrogen ; mangroves ; litterfall ; suspended matter ; zooplankton ; macrobenthos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Stable carbon isotopic composition and C/N ratio were used to trace the input of carbon associated with mangrove litter into the estuary of the Godavari–Gautami delta system and Kakinada bay (Andhra Pradesh, India). Suspended organic matter in the mangrove channels was more depleted in 13C (average δ13C = −24.5‰) than in Kakinada bay which showed δ13C values for suspended matter (average δ13C = −22.7‰) closer to those expected for marine phytoplankton. Suspended organic matter from mangrove channels was enriched in nitrogen (average C/N atom ratio ≤ 12.7) and 13C (average δ13C = −24.5‰) relative to mangrove leaf litter, which had a C/N ratio of 75 and a δ13C value of −28‰. Lowest C/N ratios for suspended matter were observed during southwest monsoon when rainfall was highest. Although in general, mangrove litter fall was also lower during this period, no clear correlation was observed between litter fall and C/N ratio of suspended matter. In general, the composition of suspended matter pointed towards phytoplankton as a major component. Isotopic composition of zooplankton suggested selective feeding on 13C-enriched, marine phytoplankton in open Kakinada bay and on 13C-depleted organic matter, such as estuarine phytoplankton and mangrove litter, in the mangrove channels. From the δ13C signature, it appeared that mangrove carbon was present to some extent in zooplankton and macrofauna from the mangrove mudflats and channels, but the signal rapidly decreased in Kakinada bay. Nitrogen isotopic composition of zooplankton and macrofauna indicated a progressive enrichment of 15N away from the mangrove forest towards the northern part of Kakinada bay, in approach of Kakinada city. This is thought to reflect input of anthropogenic nitrogen enriched in 15N and subsequent uptake of this enriched nitrogen into the aquatic food chain.
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