Phytoplankton in large river plumes in the Baltic Sea

Wasmund, Norbert; Zalewski, M.; Busch, Susanne

doi:10.1006/jmsc.1999.0615

Cited by 23 publications

(6 citation statements)

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“…spring bloom, summer maximum, clear-water phase, Rieling et al, 2003).While for freshwater ecosystems a general model for the dependency of the shape of this seasonal phytoplankton succession on the eutrophication status exists (Sommer et al, 1986), no comparable concept has been developed for brackish systems. Nevertheless, specific seasonal succession stages, characterised by distinct biomass and taxonomical composition, were identified in the Baltic Sea as well (Wasmund et al, 1999(Wasmund et al, , 2000Rieling et al, 2003).…”

Section: Discussionmentioning

confidence: 97%

Development of a phytoplankton indicator system for the ecological assessment of brackish coastal waters (German Baltic Sea coast)

et al. 2008

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The implementation of the European Water Framework Directive (WFD) requires the development of ecologically-based classification systems for anthropogenically-induced eutrophication in all types of water bodies. Due to the inherent high temporal and spatial variability of hydrological and geochemical parameters of the coastal waters of the southern Baltic Sea, discrimination between anthropogenic impact and natural variability is necessary. The development of statistical methods for this discrimination was the main aim of this study. These methods were used to derive indicative phytoplankton parameters for different stages of eutrophication for the investigation area. For this purpose, a long-term phytoplankton data series was analysed, which covered a broad salinity and eutrophication gradient. In order to detect eutrophication effects, the analysis was restricted to phytoplankton spring bloom events and to the salinity range between 5 and 10 psu, i.e. superimposing seasonal and hydrodynamic effects were eliminated. An artificial abiotic degradation vector was developed based on four typical water quality parameters. A total of 11 potentially indicative phytoplankton parameters on different taxonomical levels arose from a correlation analysis with this degradation vector. These indicators were then tested for their ability to discriminate between three eutrophication levels. Finally, seven phytoplankton indices could be proposed: total phytoplankton biovolume, the percentage of diatoms and the biovolume of different size ranges of diatoms and one indicative species (Woronichinia compacta).

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Section: Discussionmentioning

confidence: 97%

Development of a phytoplankton indicator system for the ecological assessment of brackish coastal waters (German Baltic Sea coast)

et al. 2008

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“…This is in accordance with Ghezelbash et al (2008), who showed that microalgae cultured at 40 g L −1 had the highest biomass. Some cyanobacteria are tolerant to a wide range of salinities (Wasmund, Zalewski & Busch 1999). According to Rejmánková and Komárková (2005), for cyanobacteria species, there was a tendency towards a lower biomass at a high salinity.…”

Section: Discussionmentioning

confidence: 99%

Effects of salinity on the growth and proximate composition of selected tropical marine periphytic diatoms and cyanobacteria

Khatoon

Banerjee

Yusoff

et al. 2010

Aquaculture Research

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Marine periphytic cyanobacteria and diatoms have been examined as a potential source of feed supplement for rearing aquatic larvae in the aquaculture industry. Culture of the periphytic diatom Amphora sp., Navicula sp., Cymbella sp. and the cyanobacteria Oscillatoria sp. at di¡erent salinities showed signi¢cant changes in biomass and speci¢c growth rates. Diatoms growth was signi¢cantly higher at 35 g L À 1 , while for cyanobacteria growth was better at 25 g L À 1 . Signi¢cantly higher levels of protein and lipid were found in diatoms at low salinities (152 5 g L À 1 ) and an increase in carbohydrate at high salinities (30^35 g L À 1 ). Conversely, cyanobacteria showed a signi¢cantly higher lipid content at 303 5 g L À 1 compared with other salinity levels but no signi¢cant changes were observed in the protein and carbohydrate contents at di¡erent salinity levels. The present ¢ndings can be taken into consideration when culturing marine periphytic Amphora sp., Navicula sp., Cymbella sp. and Oscillatoria sp. to provide appropriate levels of protein, lipid and carbohydrate as feed supplement as well as for bioremediation in aquaculture.

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“…Diatoms can generally grow throughout the Baltic Sea, but dinoflagellates are restricted to marine and brackish waters. Therefore, the Dia/Dino index is not applicable in freshwater-influenced areas such as lagoons (Olenina, 1998;Gasiūnaitė et al, 2005), large river plumes (Wasmund et al, 1999), and parts of the Gulf of Bothnia (Klais et al, 2011).…”

Section: Limitations and Advantages Of The Dia/dino Indexmentioning

confidence: 99%

The Diatom/Dinoflagellate Index as an Indicator of Ecosystem Changes in the Baltic Sea 1. Principle and Handling Instruction

et al. 2017

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Assessments of the environmental status of the Baltic Sea as called for by the Marine Strategy Framework Directive (MSFD) must be based on a set of indicators. A pre-core indicator is the diatom/dinoflagellate index (Dia/Dino index), which reflects the dominance of diatoms or dinoflagellates during the phytoplankton spring bloom. Here we explain the principles of the Dia/Dino index and the conditions for its calculation using examples from two very different water bodies, the Eastern Gotland Basin and Kiel Bay. The index is based on seasonal mean diatom and dinoflagellate biomass values. A precondition for its applicability is the coverage of the bloom. As a criterion, the maximum value of diatom or dinoflagellate biomass has to exceed a predefined threshold, e.g., 1000 µg/L in the investigated areas. If this condition is not fulfilled, an alternative Dia/Dino index can be calculated based on silicate consumption data. Changes in the dominance of these two phytoplankton classes impact the food web because both their quality as a food source for grazers and their periods of occurrence differ. If diatoms are dominant, their rapid sinking reduces the food stock for zooplankton but delivers plenty of food to the zoobenthos. Consequently, the Dia/Dino index can be used to follow the food pathway (Descriptor 4 of MSFD: "food web"). Moreover, a low Dia/Dino index may indicate silicate limitation caused by eutrophication (Descriptor 5 of MSFD: "eutrophication"). The Dia/Dino index was able to identify the regime shift that occurred at the end of the 1980s in the Baltic Proper. Diatom dominance, and thus a high Dia/Dino index, are typical in historical data and are therefore assumed to reflect good environmental status (GES). In assessments of the environmental status of the Eastern Gotland Basin and Kiel Bay, Dia/Dino index GES thresholds of 0.5 and 0.75, respectively, are suggested. The GES thresholds as calculated by the alternative Dia/Dino index are 0.84 and 0.94, respectively.

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Phytoplankton in large river plumes in the Baltic Sea

Cited by 23 publications

References 0 publications

Development of a phytoplankton indicator system for the ecological assessment of brackish coastal waters (German Baltic Sea coast)

Development of a phytoplankton indicator system for the ecological assessment of brackish coastal waters (German Baltic Sea coast)

Effects of salinity on the growth and proximate composition of selected tropical marine periphytic diatoms and cyanobacteria

The Diatom/Dinoflagellate Index as an Indicator of Ecosystem Changes in the Baltic Sea 1. Principle and Handling Instruction

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