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dc.contributor.authorSathish, K.
dc.contributor.authorPatil, J. S.
dc.contributor.authorAnil, A. C.
dc.date.accessioned2025-11-04
dc.date.accessioned2025-11-04T09:45:48Z
dc.date.available2025-09-15
dc.date.available2025-11-04T09:45:48Z
dc.date.issued2025
dc.identifier.citationMarine Biology Research, vol.21(4 5);2025;pp.183 197. https://doi.org/10.1080/17451000.2025.2512083
dc.identifier.issn1745-1000
dc.identifier.otherhttps://www.tandfonline.com/doi/full/10.1080/17451000.2025.2512083
dc.identifier.urihttps://doi.org/10.1080/17451000.2025.2512083
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9557
dc.descriptionIF2024=1.2
dc.description.abstractThe roles of biotic factors (grazing/senescence) in chlorophyll a (Chl a) breakdown (CB) to non-fluorescence derivatives in a multistep pathway are frequently reported. In aquatic microalgae, the information on CB-pathway is scarce compared to land plants. The enzymatic activities (e.g. chlorophyllase dephytalation; pheophytinase demetalation) involved in CB vary significantly among phytoplankton species, but how this influences the CB-pathway is unknown, and delineating the same will aid in determining the fate of high microalgal biomass, particularly blooms. The grazing experiments using three species of bloom-forming marine phytoplankton (Skeletonema costatum (Bacillariophyceae), Dunaliella tertiolecta (Chlorophyceae) and Amphidinium carterae (Dinophyceae)) and mixed natural assemblage confirmed that the CB-pathway under grazing-pressure is species-specific and the grazer s feeding habits. In Dunaliella and Amphidinium, with and without chlorophyllase-activity, respectively, higher pheophytin, and lower pheophorbide formation suggested the Chl a pheophytin pheophorbide pathway. Skeletonema with high chlorophyllase activity produced higher pheophorbide suggesting CB through the Chl a-chlorophyllide pheophorbide pathway. In the presence of grazers, the pheophorbide: pheophytin ratio was several times higher in Skeletonema (3-40) than others (0.1-<1) suggesting a potential proxy for determining Chl a chlorophyllide pheophorbide (>1) or Chl a pheophytin pheophorbide pathway (<1) dominance. This study emphasises that using CB pathway indicator to assess bloom fate will advance microalgal bloom research and ecosystem evaluation.
dc.languageen
dc.publisherTaylor and Francis Online
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.titleTaxa specific grazing-induced phytoplankton chlorophyll breakdown pathway: implication in algal bloom monitoring and mitigation programs
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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