Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
Effects of phytoplankton blooms on the cycling of manganese and iron in coastal waters
Schoemann, V.; de Baar, H.J.W.; de Jong, J.T.M.; Lancelot, C. (1998). Effects of phytoplankton blooms on the cycling of manganese and iron in coastal waters. Limnol. Oceanogr. 43(7): 1427-1441
In: Limnology and Oceanography. American Society of Limnology and Oceanography: Waco, Tex., etc. ISSN 0024-3590; e-ISSN 1939-5590, meer
|  |
| Trefwoorden |
Algal blooms
Aquatic communities > Plankton > Phytoplankton
Chemical elements > Metals > Transition elements > Heavy metals > Iron
Chemical elements > Metals > Transition elements > Heavy metals > Manganese
Cycles > Chemical cycles > Geochemical cycle > Biogeochemical cycle > Nutrient cycles
Trace elements
Water bodies > Coastal waters
Noctiluca Suriray, 1836 [WoRMS]; Phaeocystis Lagerheim, 1893 [WoRMS]
ANE, Noordzee, Zuidelijke Bocht [Marine Regions]
Marien/Kust |
| Auteurs | | Top |
- Schoemann, V., meer
- de Baar, H.J.W.
- de Jong, J.T.M.
- Lancelot, C., meer
|
|
|
| Abstract |
The development of intense plankton blooms during spring controls the concentrations of dissolved Mn and Fe in eutrophic shallow coastal waters of the North Sea. Proliferation of diatoms, Phaeocystis colonies, and Noctiluca was accompanied by changes of particulate and dissolved Mn and Fe in the water column. The latter parameters were measured simultaneously with relevant physical, chemical, and biological variables at two sites in the coastal waters of the Southern North Sea, in 1993 at one site and in 1994 at both sites. Removal of dissolved Fe and particulate Fe, Mn, and Al occurred during the inception of the spring bloom. This could be due to biological uptake, adsorption of abiotic particles onto settling phytoplankton cells, or ingestion of abiotic particles by zooplankton during grazing, with subsequent settling of fecal pellets. We also observed a seasonal increase of dissolved Mn and Fe and progressive changes in the composition of the particulate Mn and Fe in the water column after peaks in spring diatom and Phaeocystis blooms. This can be explained by the following sequence of events. The organic matter produced during the spring phytoplankton blooms is degraded by the heterotrophic organisms in the water column and the sediment. This leads to anoxic conditions near the surficial layer in the shallow coastal sediments. First, Mn oxides and then Fe oxides are used as oxidants for the degradation of organic matter, resulting in the reduction and dissolution of Mn and Fe. Dissolved Mn and Fe diffuse to the oxic overlying water and are partly adsorbed or precipitated on the suspended particulate matter. The other part remains in solution longer because of a decrease in the oxidation rate. This decrease results from a lowering of both the pH from 8.6 to 8.1 and the oxygen concentrations from 378 to 204 µM in the water column due to the activity of heterotrophs in the water column and sediment. Noctiluca could also be responsible for the reduction of Mn and Fe associated with bacteria and phytoplankton. Overall, the seasonal evolution of dissolved and particulate Mn and Fe is consistent with the successive autotrophic and heterotrophic activities. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
