Biological nutrient retention and changes in aquatic food-webs through river damming in N Sweden

Updated 2003-04-22

Damming leads to depletion of major elements in boreal river water, with potential effects on biological production in coastal marine areas (Humborg et al. 2002, Global Biogeochem. Cycles 16 in press), such as the Baltic Sea. Today, the causal mechanism to this element depeltion is unknown. The present project aims to estimate biological nutrient retention in a dammed river system (Luleälven) and an unregulated system (Torneälven). As to lenthic production, lake Torne träsk offers excellent opportunities to study the pelagic productivity regime of a pristine boreal aquatic system. Our field programme includes measurements of mictic conditions, nutrients (P, N, Si), dissolved and particulate constituents (major and minor elements), stabile isotopes (C, N, Sr, O), primary productivity, zooplankton abundance, and fish.

Time frame

Project time span
2001 - 2003
Data collection
not specified
Data processing
not specified
Data reporting
not specified

Contact information

Contact person
Sven Blomqvist
Department of Systems Ecology Stockholm University SE-106 91 Stockholm Sweden

Parameters and Media

Not specified


Regions studied
Abisko Scientific Research Station

Data availability

Samples/specimens archived in specimen banks?

Methods & Procedures

Not specified

Additional Information

Is this a bi- AND multi-lateral project (i.e. a project involving cooperation between different countries)?
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