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- W2031654711 abstract "The fate of crab-processed mangrove Avicennia marina leaf litter was compared with decomposition of whole leaf litter of A. marina and Rhizophora stylosa. Shredding by the grapsid crab Parasesarma erythodactyla resulted in reduction of mangrove leaf litter to fragments ~200 µm in the faecal material. The C/N ratio decreased linearly with time, attaining ~20 after 28 d. While the δ 13 C signature remained constant, the δ 15 N value steadily changed from ~4‰ to 1.8‰ over 4 wk. Decom- posing whole leaf litter, however, showed only modest increases in %N content with time, attaining a C/N ratio of ~20 only after 24 wk, with no significant temporal trend in either δ 13 C or δ 15 N. δ 15 No f decomposing crab faecal material was significantly negatively correlated with surface bacteria den- sity. Demonstrating a sigmoid pattern of increase, surface bacteria density on crab-processed leaf fragments was ~70 times higher than that on whole leaf litter after 28 d of decomposition. Analysis of the C/N ratio, δ 13 C and δ 15 N signatures of micro-POM collected from 5 mangrove waterways in southern Moreton Bay, Australia, failed to detect significant differences in these parameters at 3 dis- tances from mangrove forests, but location of the waterways had a strong effect. In laboratory feed- ing experiments involving the copepods Temora turbinata and Oithona rigidis, a diet of faecal mate- rial from crabs significantly improved copepod survivorship compared with a diet of the alga Nannochloropsis sp. or the no-food treatment for both copepods. Stable isotope analysis of the copepods suggest that the animals were able to utilise both crab faecal material and algal carbon, with greater assimilation of the former food source, in the mixed diet (Nannochloropsis + crab faeces) treatment. By acting as shredders, grapsid crabs process large quantities and effect rapid enrichment of mangrove organic production, potentially benefiting both benthic and pelagic estuarine consumers." @default.
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- W2031654711 date "2005-01-01" @default.
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- W2031654711 title "Grapsid crabs mediate link between mangrove litter production and estuarine planktonic food chains" @default.
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- W2031654711 doi "https://doi.org/10.3354/meps293165" @default.
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