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Project type/Form of grant
Project grant
Title [sv]
Bildning av metylkvicksilver i akvatiska ekosystem med olika struktur och produktivitet i den pelagiala näringskedjan - Nya strategier för molekylära studier i mesokosmexperiment
Title [en]
Methyl mercury formation in aquatic systems with different pelagic food web structure and productivity - Novel strategies for molecular-level studies in mesocosm experiments
Abstract [sv]
The aim of the project is to utilize novel analytical strategies to advance the molecular-level understanding of the relation between biogeochemical processes controlling methyl mercury (CH3Hg) formation and pelagic food web structure and productivity in aquatic ecosystems. We will study how this relation affects the relative CH3Hg formation from fresh and aged Hg depositions and how ecological changes in the pelagic food web (from climate change or eutrophication) may alter CH3Hg formation rate. We will use a well-controlled mesocosm system consisting of 12 isolated tubes (0.8m id, 5m height), each containing field-collected sediment and water phases. To these we will add stable Hg isotope tracers, according to new tailored protocols, to quantify Hg-species? reaction rates. The pelagic food web structure and productivity will be controlled to generate phytoplankton or bacteria dominated webs. Analytical and modeling methods will be used to assess how speciation and reactivity of Hg is controlled by chemical and microbial environment and pelagic food web characteristics. The results will give refined state of the art analytical approaches for Hg biogeochemistry research and new important molecular-level understanding of CH3Hg formation in aquatic systems following reduced anthropogenic Hg emissions and escalated climate change and eutrophication. This fundamental knowledge is vital for future risk assessments of Hg and for rational actions to reduce CH3Hg(II) content in fish.
Principal InvestigatorBjörn, Erik
Coordinating organisation
Umeå University
Funder
Period
2009-01-01 － 2011-12-31
Identifiers
DiVA, id: project:899Project, id: 2008-04363_VR

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