Vertical migration of the toxic dinoflagellate Gymnodinium catenatum under different concentrations of nutrients and humic substances in culture

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dc.contributor.author Doblin, Martina en_US
dc.contributor.author Thompson, Peter en_US
dc.contributor.author Revill, Andrew en_US
dc.contributor.author Butler, Edward en_US
dc.contributor.author Blackburn, Susan en_US
dc.contributor.author Hallegraeff, Gustaaf en_US
dc.date.accessioned 2009-12-21T02:29:26Z
dc.date.available 2009-12-21T02:29:26Z
dc.date.issued 2006 en_US
dc.identifier 2006004733 en_US
dc.identifier.citation Doblin Martina et al. 2006, 'Vertical migration of the toxic dinoglagellate Gymnodinium catenatum under different concentrations of nutrients and humic substances in culture', Elsevier, vol. 5, pp. 665-677. en_US
dc.identifier.issn 1568-9883 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3616
dc.description.abstract Vertical migration behaviour by the chainforming dinoflagellate Gymnodinium catenatum Graham was investigated using vertically-stratified laboratory columns. Under surface nutrient-deplete conditions, with nutrients added only at depth, 100% of cells underwent vertical migration (VM), starting downwards migration 3 h before the end of the light period and beginning upwards migration 3 h before the start of the light period. Cells in nutrient-replete columns showed no VM, but they were more dispersed in the upper layer during the dark compared to the light period. When surface layers (S) were nitrate-deplete (-N) and enriched with humic substances (H) contained in Huon River water and bottom waters (B) were nutrient replete (R) (SH-NBR), the pattern of VM was altered-50% of cells underwent migration and 50% remained at the pycnocline. In columns with nitrate-replete and humic-enriched surface layers (SHRBR), Most cells underwent VM, while 30% remained at the surface. Cells in SH-NBR columns showed increased N quotas and intra-cellular nitrate concentrations after 4 days, indicating nitrate uptake by G. catenatum in bottom layers. The concomitant increase in particulate organic nitrogen (PON) with the decrease in external nitrate concentrations in bottom layers provide convincing evidence that VM by G. catenatum facilitates nutrient retrieval at depth. However, addition of humic substances (a potential source of organic nitrogen) to surface layers did not ameliorate G. catenatum N depletion sufficiently to preclude the need for NO3- uptake at depth. Furthermore, there was no detectable pattern of increasing carbon (C) quota during the day (photosynthate accumulation) or increasing N quota during the night (nitrate assimilation). en_US
dc.publisher Elsevier en_US
dc.relation.isbasedon http://dx.doi.org/10.1016/j.hal.2006.02.002 en_US
dc.title Vertical migration of the toxic dinoflagellate Gymnodinium catenatum under different concentrations of nutrients and humic substances in culture en_US
dc.parent Harmful algae en_US
dc.journal.volume 5 en_US
dc.journal.number 6 en_US
dc.publocation Amssterdam, The Netherlands en_US
dc.identifier.startpage 665 en_US
dc.identifier.endpage 677 en_US
dc.cauo.name DVCRch.Institute for Water & Environmental Resource Mgmnt en_US
dc.conference Verified OK en_US
dc.for 060700 en_US
dc.personcode 996445 en_US
dc.personcode 0000028439 en_US
dc.personcode 0000028440 en_US
dc.personcode 0000028441 en_US
dc.personcode 0000028442 en_US
dc.personcode 117079 en_US
dc.percentage 100 en_US
dc.classification.name Marine and Estuarine Ecology (incl. Marine Ichthyology) en_US
dc.classification.type FOR-08 en_US
dc.description.keywords CDOM; Gymnodinium catenatum; humic substances; nitrogen; N-stratified; vertical migration en_US
dc.staffid 117079 en_US


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