Dynamics of transparent exopolymeric particles (TEP) and particle-associated carbohydrates in the Dona Paula bay, west coast of India |
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| Authors: | P V Bhaskar Narayan B Bhosle |
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| Institution: | (1) Marine Corrosion and Materials Research Division, National Institute of Oceanography, Dona Paula, 403 004 Goa, India;(2) Present address: Chemical Oceanography Division, National Institute of Oceanography, Dona Paula, 403 004 Goa, India |
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| Abstract: | Surface seawater samples were collected over a period of 27 months at a shallow water station in Dona Paula bay from 1998–2000.
The samples were analyzed to assess the seasonal variations, inter-annual variability and the contributions of:
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•transparent exopolymeric particles (TEP) concentration,
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•two forms of particle-associated carbohydrates — 1.5 M NaCl/saline extracted (Sal-PCHO) and 10 mM EDTA-extracted (CPCHO)
and
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•total bacterial abundance (TBA) to particulate organic carbon pool.
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A distinct inter-annual variability was observed with an increase in the bacterial abundance, chlorophylla (Chl a), TEP and Sal-PCHO and their greater contribution to particulate organic carbon during May 1998–1999 than in June
1999–July 2000. Overall, there was no statistically significant correlation of TEP with phytoplankton biomass (Chl a), Sal-PCHO,
CPCHO and hydrodynamic conditions. A weak inverse correlation was observed between TEP and TBA (r = −0.397;p < 0.05) but the role of TEP as a C-source for bacteria was not evident. Both Sal-PCHO and CPCHO appeared to be two distinct
forms of carbohydrates. Unlike CPCHO, Sal-PCHO concentrations showed a positive trend with Chla and significant linear correlation with bacterial abundance (r = 0.44,p < 0.007,n = 48), indicating that Sal-PCHO as carbon source might have supported bacterioplankton abundance. The mean %TEP-C contribution
to the annual average organic carbon for 1998–2000 was 6.9% ± 5.8%, next only to phytoplankton-C (33.1 ± 22.1%) and greater
than bacterial-C (4.6% ± 4.6%) or carbohydrate-C (< 3.8%). Despite its greater contribution to the organic carbon pool, the
contribution of TEP-C to the benthic carbon demand and its fate in the study area could not be ascertained in this study. |
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| Keywords: | Transparent exopolymeric particles particle-associated carbohydrates bacteria phytoplankton |
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