Show simple item record

dc.contributor.authorPandey, M.
dc.contributor.authorBiswas, H.
dc.contributor.authorSchmidt, S.
dc.date.accessioned2025-03-05
dc.date.accessioned2025-03-19T11:32:02Z
dc.date.available2025-01-13
dc.date.available2025-03-19T11:32:02Z
dc.date.issued2025
dc.identifier.citationMarine Environmental Research, Vol.204;2025, article no:106940
dc.identifier.issn0141-1136
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S0141113624006019
dc.identifier.urihttps://doi.org/10.1016/j.marenvres.2024.106940
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9386
dc.descriptionIF2023= 3.0
dc.description.abstractThe western Indian continental shelf (eastern Arabian Sea) exhibits contrasting biogeochemical features. This area becomes highly productive due to summer monsoon-driven coastal upwelling in the south and winter monsoon-induced convective mixing in the north. Additionally, in the northern self, the eastern boundary of the Oxygen Minimum Zone (OMZ) persists but is absent in the south. Phytoplankton blooms are dominated by diatoms that contribute to sedimentary phytodetritus flux supplying major elements (C, N, Si) and food for benthic biota and hence important to address. Here we present the data on organic matter content, diatom frustule flux, abundance, and diversity using surface sediments (core tops collected using a multicorer) from 6 locations (11 21 N) along the shelf in a 2 interval at 200 m isobaths. The organic matter retrieved from the core top was relatively fresh (nearly ?4.5 years old) as evident from 210Pb profiles. Frustule abundance and diversity (the maximum at 15 N and minimum at 19 N) varied from 0.10 18.46 נ104 valves g?1 and 0.79 2.32, respectively. A total of 36 diatom genera were found with two centric (Thalassiosira and Coscinodiscus), and one pennate (Nitzschia) diatoms as major contributors. The higher contribution of Thalassiosira was observed throughout the shelf dominating the south (11, 13, 15 N), whereas, in the north (17, 19, 21 N) Coscinodiscus was dominant. The highest organic matter content (3.4%) and frustule abundance (18.46 נ104 valves g?1) were seen at 15 N despite low diatom valve flux (3.3 נ103 valves cm?2 yr?1) and could be due to the influence of OMZ, where organic matter is well preserved. Contrarily, the upwelling-influenced station in the south (at 11 N) exhibited the highest diatom valve flux (10.14 נ103 valves cm?2 yr?1), however low organic matter content (1.6 %) and frustule abundance (4.99 נ104 valves g?1) were attributed to faster mineralization. This study suggested that the preservation potential of organic matter varies across the shelf and is likely to control its recycling, impacting nutrient release and resources for the benthic community.
dc.languageen
dc.publisherElsevier
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleDistribution of organic matter and diatom frustules (diversity, flux) along the western Indian continental shelf related to contrasting physicochemical settings
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record