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Phytoplankton bioma...
Phytoplankton biomass controls tocopherol concentrations in Baltic Sea zooplankton
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- Häubner, Norbert (författare)
- Uppsala universitet,Ekologisk botanik
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- Tallmark, Bo (författare)
- Uppsala universitet,Zooekologi
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- Snoeijs, Pauli (författare)
- Department of Systems Ecology, Stockholm University
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(creator_code:org_t)
- Engelska.
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Ingår i: Marine Ecology Progress Series. - 0171-8630 .- 1616-1599.
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- Nearly all organisms are constantly exposed to oxidative threat, because every reaction where oxygen is involved gives rise to oxidants. Efficient protection is provided by antioxidants. Vitamin E (tocopherol) is an essential plant-derived antioxidant and poorly studied so far in marine food webs. In 2004 and 2005 eight offshore expeditions were conducted in the Baltic Sea to explore the dynamics of α-tocopherol in the pelagic food web. In order to analyze tocopherol production and transition to the next food web level, two plankton size classes were sampled; <100 µm (dominated by phytoplankton) and >200 µm (dominated by calanoid copepods). HPLC analysis revealed lowest values of α-tocopherol per L seawater in March in both size classes and highest in May for <100 µm (31.5 ng L-1) and August for >200 µm (1.3 ng L-1). No consistent seasonal pattern could be observed in α-tocopherol per unit biomass for the zooplankton. Concentrations ranged in <100 µm from 0.05 to 0.10 ng µg C-1 and in >200 µm from 0.05 to 0.11 ng µg C-1. Partial least square regression (PLS) revealed nutrional status and species composition of the phytoplankton biomass as driving factors of α-tocopherol production in phytoplankton. Abiotic factors, as depth and temperature were only of significant influence in May. In zooplankton, the α-tocopherol concentration was negatively associated with phytoplankton biomass in May. Therefore we concluded that assimilation efficiency of zooplankton in combination with high phytoplankton biomass is the bottle-neck in tocopherol transport from phytoplankton to higher levels in the food web.
Nyckelord
- Vitamin E; Food web; Phytoplankton; Zooplankton; Baltic Sea
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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