dc.contributor.author | Resmi, P. | |
dc.contributor.author | Manju, M.N. | |
dc.contributor.author | Gireeshkumar, T.R. | |
dc.contributor.author | RatheeshKumar, C.S. | |
dc.contributor.author | Chandramohanakumar, N. | |
dc.date.accessioned | 2016-07-12T07:13:27Z | |
dc.date.available | 2016-07-12T07:13:27Z | |
dc.date.issued | 2016 | |
dc.identifier.citation | Regional Studies in Marine Science, vol.7; 2016; 43-54 | |
dc.identifier.uri | http://drs.nio.org/drs/handle/2264/5001 | |
dc.description.abstract | Surface sediment samples from five mangrove ecosystems along the Kerala coast, north of Kochi were analysed for elemental ratios, stable isotopes of carbon and hydrocarbon biomarkers (n-alkanes, n-alkenes and hopanes) to assess the sources and early diagenesis of sedimentary organic matter. The elemental and isotopic ratios along with sedimentary chlorophyll a content, suggested substantial contribution of planktonic organic matter apart from mangrove/terrestrial derived organic matter. The sources of organic matter showed variability in relation with the geographical setting of mangrove systems as well as with seasons. The n-alkanes in mangrove sediments consist of organic matter derived from varying contributions of planktonic, bacterial and terrestrial sources. The distributional features of n-alkanes with low molecular weight (<C<sub>20</sub>) indicated the preponderance of algal derived organic matter, whereas the unresolved complex mixtures for low molecular n-alkanes indicated active microbial reworking. The n-alkane derived molecular indices enable the effective source appropriation of different end members in the study region, while diagenetic alteration products of lipids such as n-alkenes, branched alkanes and n-alkylcyclohexanes along with hopanes are indicative of organic matter diagenetic pathway in sediments. The n-alkenes in the study area probably derived from decarboxylation reactions of unsaturated fatty acids and other terrestrial inputs. The higher input of mangrove/terrestrial derived organic matter is evident by the average chain length data. Information obtained using biomarkers will allow to discriminate organic carbon sources in these mangrove ecosystems | |
dc.language.iso | en | |
dc.publisher | Elsevier | |
dc.rights | An edited version of this paper was published by Elsevier. Copyright [2016] Elsevier | |
dc.subject | GEOLOGY AND GEOPHYSICS | |
dc.subject | CHEMISTRY AND BIOGEOCHEMISTRY | |
dc.subject | CHEMISTRY AND BIOGEOCHEMISTRY | |
dc.subject | AQUATIC ECOLOGY, PRODUCTIVITY | |
dc.title | Source characterisation of Sedimentary organic matter in mangrove ecosystems of northern Kerala, India: Inferences from bulk characterisation and hydrocarbon biomarkers | |
dc.type | Journal Article | |