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dc.contributor.authorJaleel, A.K.U.
dc.contributor.authorParameswaran, U.V.
dc.contributor.authorAiswarya, G.
dc.contributor.authorChippy, K.
dc.contributor.authorSanjeevan, V.N.
dc.contributor.authorAnilKumar, V.
dc.contributor.authorGupta, G.V.M.
dc.date.accessioned2021-06-16
dc.date.accessioned2021-06-22T10:08:58Z
dc.date.available2021-02-28
dc.date.available2021-06-22T10:08:58Z
dc.date.issued2021
dc.identifier.citationMarine Environmental Research, vol.166; 2021; Article no: 105278
dc.identifier.issn0141-1136
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S0141113621000271
dc.identifier.urihttps://doi.org/10.1016/j.marenvres.2021.105278
dc.identifier.urihttps://drs-beta.nio.org/drs/handle/2264/8616
dc.descriptionIF2019 - 2.727
dc.description.abstractCoastal upwelling in the south eastern Arabian Sea (SEAS) leads to oxygen depletion over the continental shelf during the summer monsoon season (June-September), with latitudinal gradients in intensity. Based on two surveys in the onset (June) and peak (August) phases of the summer monsoon, the present study evaluates the response of macrozoobenthic communities (size >500 ?m) to upwelling and consequent hypoxia (dissolved oxygen <0.2 ml/l) in the central sector of the SEAS shelf (10-12�N, 30-200 m). From the onset to the peak monsoon, macrozoobenthic density increased five-fold in the mid-shelf (50 m water depth), and nearly doubled in the outer shelf (100 m water depth) and shelf edge (200 m water depth). This was found to be a direct consequence of recruitment and proliferation of opportunistic polychaetes, particularly the spionid Paraprionospio pinnata, which was the single dominant species (52-78%) at all depths during the peak monsoon. With the establishment of the monsoon, the shelf communities (particularly 50-100 m depth sites) are thus transformed from relatively diverse assemblages to dense, single-species dominated ones. The shelf-edge communities (150-200 m depths), which are impacted with the perennial Arabian Sea oxygen minimum zone, and therefore harbour opportunist-dominated communities year-round. It is postulated that larvae of hypoxia-tolerant taxa are transported from the shelf edge by the process of upwelling onto the shelf. The settlement and survival of these larvae are regulated by the nature of shelf sediments and by the prevailing hypoxia. Thus, substantial recruitment of opportunists occurred in the outer and mid-shelf (50-100 m), but not in the inner shelf (30 m), where sedimentation from river discharge hindered settlement and survival of juveniles.
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.titleResponse of macrozoobenthic communities to summer monsoon upwelling and related hypoxia in the south eastern Arabian Sea shelf
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Kochi, Kerala, India


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