Norbert Wasmund
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Natural hazards and extreme events in the Baltic Sea region Open
A natural hazard is a naturally occurring extreme event that has a negative effect on people and society or the environment. Natural hazards may have severe implications for human life and can potentially generate economic losses and damag…
Cyanobacteria net community production in the Baltic Sea as inferred from profiling <i>p</i> CO <sub>2</sub> measurements Open
Organic matter production by cyanobacteria blooms is a major environmental concern for the Baltic Sea, as it promotes the spread of anoxic zones. Partial pressure of carbon dioxide (pCO2) measurements carried out on Ships of Opportunity (S…
Review of esd-2021-13 Open
A natural hazard is a naturally occurring extreme event with a negative effect on people and society or the environment. Natural hazards may have severe implications for human life and they can potentially generate economic losses and dama…
Comment on esd-2021-13 Open
Abstract. A natural hazard is a naturally occurring extreme event that has a negative effect on people and society or the environment. Natural hazards may have severe implications for human life and can potentially generate economic losses…
Comment on bg-2021-40 Open
Abstract. Organic matter production by cyanobacteria blooms is a major environmental concern for the Baltic Sea, as it promotes the spread of anoxic zones. Partial pressure of carbon dioxide (pCO2) measurements carried out on Ships of Oppo…
Natural Hazards and Extreme Events in the Baltic Sea region Open
A natural hazard is a naturally occurring extreme event with a negative effect on people and society or the environment. Natural hazards may have severe implications for human life and they can potentially generate economic losses and dama…
Cyanobacteria net community production in the Baltic Sea asinferred from profiling <i>p</i> CO <sub>2</sub> measurements Open
Organic matter production by cyanobacteria blooms is a major environmental concern for the Baltic Sea as it promotes thespread of anoxic zones. Partial pressure of carbon dioxide (pCO2) measurements carried out on Ships of Opportunity (SOO…
Reconstructing N <sub>2</sub> -fixing cyanobacterial blooms in the Baltic Sea beyond observations using 6- and 7-methylheptadecane in sediments as specific biomarkers Open
Summer cyanobacterial blooms represent a threat to the Baltic Sea ecosystem, causing deoxygenation of the bottom water and the spread of the so-called dead zones. The history of the Baltic Sea cyanobacterial blooms is known from in situ an…
View article: Deficiency syndromes in top predators associated with large-scale changes in the Baltic Sea ecosystem
Deficiency syndromes in top predators associated with large-scale changes in the Baltic Sea ecosystem Open
Vitamin B1 (thiamin) deficiency is an issue periodically affecting a wide range of taxa worldwide. In aquatic pelagic systems, thiamin is mainly produced by bacteria and phytoplankton and is transferred to fish and birds via zooplankton, b…
Reconstructing N <sub>2</sub> -fixing cyanobacterial blooms in the Baltic Sea beyond observations using 6- and 7-methylheptadecanes in sediments as specific biomarkers Open
Summer cyanobacterial blooms represent a threat for the Baltic Sea ecosystem, causing deoxygenation of the bottom water and the spread of the so-called dead zones. The time history of the Baltic Sea cyanobacterial blooms is known from in s…
Stratification, nitrogen fixation, and cyanobacterial bloom stage regulate the planktonic food web structure Open
Changes in the complexity of planktonic food webs may be expected in future aquatic systems due to increases in sea surface temperature and an enhanced stratification of the water column. Under these conditions, the growth of unpalatable, …
View article: Controls on zooplankton methane production in the central Baltic Sea
Controls on zooplankton methane production in the central Baltic Sea Open
Several methanogenic pathways in oxic surface waters were recently discovered, but their relevance in the natural environment is still unknown. Our study examines distinct methane (CH4) enrichments that repeatedly occur below the thermocli…
View article: Controls on zooplankton methane production in the central Baltic Sea
Controls on zooplankton methane production in the central Baltic Sea Open
Several methanogenic pathways in oxic surface waters were recently discovered, but their relevance in the natural environment is still unknown. Our study examines distinct methane enrichments that repeatedly occur below the thermocline dur…
View article: Supplementary material to "Controls on zooplankton methane production in the central Baltic Sea"
Supplementary material to "Controls on zooplankton methane production in the central Baltic Sea" Open
1 Hydrographical and chemical characteristics of the water columnA SBE 911 plus CTD system (Seabird Electronics, USA) was used on the cruise to measure the temperature, salinity, chlorophyll a, and oxygen concentration along vertical depth…
Strategies of amino acid supply in mesozooplankton during cyanobacteria blooms: a stable nitrogen isotope approach Open
Knowledge of how zooplankton can utilize cyanobacteria to sustain their nitrogen (N) demand for essential compounds like amino acids ( AA s) is a key to predicting responses of higher trophic levels in terms of production and food web stru…
De novo amino acid synthesis and turnover during N<sub>2</sub> fixation Open
Cyanobacteria are the main autotrophs and N 2 ‐fixing (diazotrophic) organisms in large parts of the oligotrophic global ocean, where generally all heterotrophic production depends on their activity. Amino acids (AAs) from cyanobacteria ar…
View article: The contribution of zooplankton to methane supersaturation in the oxygenated upper waters of the central Baltic Sea
The contribution of zooplankton to methane supersaturation in the oxygenated upper waters of the central Baltic Sea Open
We report on methane enrichments that were observed during summer in the upper water column of the Gotland Basin, central Baltic Sea. In the eastern part of the basin, methane concentrations just below the thermocline varied between 15 nM …
The Diatom/Dinoflagellate Index as an Indicator of Ecosystem Changes in the Baltic Sea. 2. Historical Data for Use in Determination of Good Environmental Status Open
The diatom/dinoflagellate index (Dia/Dino index) serves as an indicator in the assessment of the ecological status of the Baltic Sea within the scope of the Marine Strategy Framework Directive (MSFD). It describes the dominance patterns in…
View article: The Diatom/Dinoflagellate Index as an Indicator of Ecosystem Changes in the Baltic Sea 1. Principle and Handling Instruction
The Diatom/Dinoflagellate Index as an Indicator of Ecosystem Changes in the Baltic Sea 1. Principle and Handling Instruction Open
An ecosystem shift in the Baltic Proper at the end of the 1980s could be identified by a decreasing springtime diatom/dinoflagellate ratio. Therefore the suggested diatom/dinoflagellate index (Dia/Dino index) was developed as a descriptive…
pCO2 underway data from the Benguela Upwelling System in southeastern South Atlantic Ocean Open
Within the BMBF funded project GENUS (Geochemistry and Ecology of the Namibian Upwelling System) the mole fraction of CO2 (xCO2) was measured in surface waters by using an underway pCO2 system (SUNDANS) duirng seven cruises. SUNDANS was de…
Phytoplankton Stimulation in Frontal Regions of Benguela Upwelling Filaments by Internal Factors Open
Filaments are intrusions of upwelling water into the sea, separated from the surrounding water by fronts. Current knowledge explains the enhanced primary production and phytoplankton growth found in frontal areas by external factors like n…
Biological assessment of the Baltic Sea 2015 Open
Dating to 1979, the HELCOM time series on species composition, biomass and abundance of phyto- and zooplankton as well as macrozoobenthos from Kiel Bay to the Arkona Basin was continued in 2015. The phytoplankton spring bloom occurred in t…