Jakob Walve
Contact
Name and title: Jakob Walve
Workplace: Department of Ecology, Environment and Plant Sciences Länk till annan webbplats.
Visiting address Room N250Svante Arrhenius väg 20 A
Postal address Institutionen för ekologi miljö och botanik106 91 Stockholm
Research group
About me
I am a marine ecologist with broad interest in how marine ecosystems are affected by and cycle nutrients and the many factors driving environmental change in the pelagic zone. The factors controlling cyanobacteria blooms in the Baltic Sea and its coastal areas and the impact of the blooms on the ecosystem are of particular interest. Another research interest is the causes and effects of bottom-water anoxia and the effects on nutrient cycling.
I am Head of the Marine Pelagic Ecology Laboratory facility at the department. A crew of 10 technicians, chemists and biologists carry out intensive sampling programmes to monitor the Baltic Sea environment, integrated with LTER, long-term ecological research. Time series, some starting in the 1970´s, of pelagic chemical and biological variables are maintained in the Stockholm archipelago and the off-shore northern Baltic Proper. The regular cruises are also a (physical and data) platform for various add-on field research.
Cyanobacteria bloom in the Baltic Sea
I contribute with lectures and field parts in courses like Aquatic Ecology, Marine Population and Ecosystems Dynamics, and the Marine Biology summer course.
Svealand archipelago environment analysis (Svealands kustvattenvårdsförbund, SKVVF). The Svealand coastal area covers the scenic archipelagos of Stockholm, Uppsala and Södermanland. Our aim is to deepen the knowledge of these complex waters' ecological status, the driving factors behind the present status, and the effect of different measures to improve the water quality. The basis is an extensive sampling program to describe and follow water quality. The environmental analysis function is a collaboration with the Baltic Sea Centre. Results are presented in the Svealandskusten report and website.
Himmerfjärden Eutrophication Study (SYVAB). See map and data plots (click stations in map. Updated regularly with the recent results).
Waterbody Assessment Tools for Ecological Reference conditions and status in Sweden, WATERS (Naturvårdsverket/Hav och Vattenmyndigheten). Finished in 2016.
Baltic Sea Cyanobacteria. We study the ecology and physiology of Baltic Sea nitrogen-fixing cyanobacteria. PhD student Jennie Barthel Svedén defended her thesis Oct 2016.
Swedish National Marine Monitoring Program (Havs och Vattenmyndigheten). We carry out the high-frequent pelagic monitoring at stations B1 (Askö) and BY31 (Landsort Deep). We also take monthly samples at BY29 (North-Eastern Gotland basin).
Himmerfjärden Eutrophication Study (SYVAB).
Effects of load reductions on phosphorus concentrations in a Baltic estuary - long-term changes, seasonal variation and management implications. 2020. Walve et al. Estuaries and coasts. DOI 10.1007/s12237-020-00769-2
The effect of optical properties on Secchi depth and implications for eutrophication management. 2019. Harvey et al. Frontiers in Marine Science.