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- W2034100276 abstract "SUMMARY The ability of sponges to feed in diverse (including oligotrophic)ecosystems significantly contributes to their ubiquitous aquatic distribution. It was hypothesized that sponges that harbour small amounts of symbiotic bacteria in their mass feed mainly on particulate organic matter (POM). We examined the nearly symbiont-free (by microscopic observation) filter-feeding Red Sea sponge Negombata magnifica in order to: (a) study removal efficiency of naturally occurring organic particles, (b) measure the total amount of absorbed particulate organic carbon (POC) and nitrogen (PON), and(c) estimate organic carbon and nitrogen flux in this sponge. Total amount of organic carbon and nitrogen in the Gulf of Aqaba was found to be 48.46±5.69 μg l–1 and 6.45±0.7 μg l–1, respectively. While detritus contributed 54% of POC,most PON (84%) came from planktonic microorganisms, mainly prokaryotes. Particle removal efficiency ranged from 99% (the cyanobacterium Synechococcus sp.) to 37% (for eukaryotic cells >8 μm). On average, N. magnifica ingested 480 μg C day–1g–1 (wet mass, WM) sponge and 76.6 μg N day–1 g–1 sponge. Ingested POC balanced 85%of the sponge's energetic demand but more is needed for biomass production because it cannot digest all of the carbon. 54.4±16.1 μg N day–1 g–1 (WM) nitrogen was excreted as total ammonia nitrogen (TAN); however, nitrogen allowance should be higher because more nitrogen is deposited for sponge biomass during growth. It is hypothesized that the discrepancy in the nutritional requirements should be covered by the sponge absorbing carbon and nitrogen from sources that are not dealt with in the present research, such as dissolved organic carbon and nitrogen. This study highlights the significance of detritus as a carbon source, and prokaryotes as a PON source in sponge feeding." @default.
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- W2034100276 date "2009-11-15" @default.
- W2034100276 modified "2023-10-16" @default.
- W2034100276 title "Particulate organic matter as a food source for a coral reef sponge" @default.
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- W2034100276 doi "https://doi.org/10.1242/jeb.027953" @default.
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