Fluxes of amino acids and hexosamines to the deep Arabian Sea

Haake, B.; Ittekkot, V.; Ramaswamy, V.; Nair, R.R.; Honjo, Susumu

doi:10.1016/0304-4203(92)90028-9

Cited by 83 publications

(45 citation statements)

References 48 publications

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“…It was interesting to note that the concentrations of both GLU-N and GAL-N decreased rapidly with the increasing depth suggesting their utilization. This AS distribution pattern contradicts the distribution pattern of these compounds observed in the sedimenting particles (Belluomini et al 1986;Haake et al 1992;Hashimoto et al 1998;Gupta and Kawahata 2000). In sedimenting particles the concentrations of amino sugars generally increased with water depth.…”

Section: Resultscontrasting

confidence: 62%

“…HPLC method is routinely employed for the analysis of AS in sedimenting particles and sediments (Belluomini et al 1986;Haake et al 1992;Jennerjahn and Ittekkot 1997;Hashimoto et al 1998;Gupta and Kawahata 2000;Takano et al 2004). Using this method glucosamine (GLU-N) and galactosamine (GAL-N) were detected in the SPM samples collected from different stations sampled in the Bay of Bengal (figure 2).…”

Section: Resultsmentioning

confidence: 99%

“…An aliquot was then reacted with o-phthaldialdehyde (OPA)-mercaptoethanol reagent and then analyzed by high performance liquid chromatograph (HPLC) as described previously (Lindroth and Mopper 1979;Bhosle et al 2005). This method has been routinely used to analyze amino sugars in sedimenting particles and sediments (Belluomini et al 1986;Haake et al 1992;Jennerjahn and Ittekkot 1997;Hashimoto et al 1998;Gupta and Kawahata 2000;Takano et al 2004).…”

Section: Analysis Of Samplesmentioning

confidence: 99%

“…Hydrolysable amino acids account for < 15% of dissolved organic nitrogen in seawater, suggesting that AS could be important in the marine N cycle (McCarthy et al 1997). The distribution and cycling of AS in sedimenting particles and marine sediments have been well documented (Belluomini et al 1986;Haake et al 1992;Jennerjahn and Ittekkot 1997;Hashimoto et al 1998;Gupta and Kawahata 2000). Conversely, little is known about the distribution of AS in the SPM of marine waters (Muller et al 1986;Benner and Kaiser 2003;Unger et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Amino sugars in suspended particulate matter from the Bay of Bengal during the summer monsoon of 2001

et al. 2006

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Amino sugars (AS) are important constituents of organic matter. However, very little is known about their cycling in marine waters. In this research, we assessed the distribution and cycling of these compounds in waters of the Bay of Bengal. For this purpose, samples of suspended particulate matter (SPM) were collected from 8 depths (surface to 1000 m) at 6 locations during the 166th cruise of the ORV Sagar Kanya in the Bay of Bengal in July/August 2001. The SPM samples were analysed for particulate organic carbon (POC), particulate nitrogen (PN) and AS concentrations and composition. The AS varied between 0.4 and 17.5 nmol/l. Concentrations were high in the surface waters and generally decreased with increasing depth. AS concentration decreased from the south to north. AS accounted for 0.01 to 0.71% and 0.05 to 2.37% of POC and PN, respectively. Rapid decrease in AS-C% and AS-N% with depth indicates that these compounds were preferentially degraded relative to bulk POC and PN. The composition of AS suggests that glucosamine (GLU-N) and galactosamine (GAL-N) were present in the surface SPM samples, and their abundance decreased from surface downwards. Relatively, low values of GLU-N/GAL-N ratio indicate that the organic matter was mostly derived from the detritus of micro-organisms. Our data suggest that chitin, a polymer of the glucosamine produced by many marine organisms was not the major source of AS in the Bay. Rapid cycling of these compounds indicates their importance in the cycling of nitrogen in marine waters.

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Section: Resultscontrasting

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Section: Analysis Of Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Amino sugars in suspended particulate matter from the Bay of Bengal during the summer monsoon of 2001

et al. 2006

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“…Bacterial cell walls posses both Glc-NH 2 and Gal-NH 2 (Wolla et al, 1984), and yield a Glc-NH 2 /Gal-NH 2 ratio of <4 (Kandler, 1979). The Glc-NH 2 /Gal-NH 2 (galactosamine) ratio is therefore often used to differentiate chitinous zooplankton from microbial biomass (Haake et al, 1992). Considering the wide possibility of application of AA based parameters in interpreting compositional changes of settling particles in space and time, the data from this study were used in the calculation of these parameters in order to understand the biogeochemistry of settling particles in the equatorial Pacific Ocean.…”

Section: Fluctuations In Composition Of Particlesmentioning

confidence: 99%