Distribution of dissolved carbohydrates and uronic acids in a tropical estuary,India |
| |
Authors: | Vishwas B Khodse Narayan B Bhosle S G Prabhu Matondkar |
| |
Institution: | (1) Centre for Ecological Research, Kyoto University, 2-509-3 Hirano, Otsu Shiga, 520-2113, Japan;(2) Biological Oceanography Division, National Institute of Oceanography, Dona Paula, Goa, 403 004, India; |
| |
Abstract: | Carbohydrates including uronic acids are among the active components of dissolved organic carbon, and play an important role
in biogeochemical cycling of organic carbon in marine environments. In order to understand their distribution, concentrations
of total dissolved carbohydrate (TCHO), dissolved polysaccharide (PCHO), dissolved monosaccharide (MCHO), and dissolved uronic
acid (URA) were measured in the Mandovi estuary, west coast of India during the monsoon and premonsoon seasons. The estuary
experienced nearly fresh water condition during the monsoon season and marine condition during the pre-monsoon season. Concentrations
of TCHO, MCHO and URA ranged from 17.7 to 67.3 μM C, 4.1 to 15.5 μM C and 2.3 to 10.8 μM C, and their contribution to dissolved
organic carbon (DOC) varied from ∼11 to 60%, 2.5 to 9.7%, and 1.8 to 5.3%, respectively. PCHO accounted for ∼52 to 92% of
the TCHO. Generally, concentrations and yields of TCHO species were greater during the monsoon season. Phytoplankton abundance
and bacterial cell numbers influenced the distribution of TCHO in the pre-monsoon season but not during the monsoon season.
Transport of TCHO rich (11 to 60%) dissolved organic matter from the Mandovi estuary to the coastal waters during the monsoon
season may affect ecosystem function by fueling biological activity of heterotrophic micro-organisms. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|