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Temporal and spatial variability of phytoplankton monitored by a combination of monitoring buoys, pigment analysis and fast screening microscopy in the Fehmarn Belt Estuary

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Abstract

For 2 years, a baseline investigation was carried out to collect reference information of the present environmental status in the Fehmarn Belt and adjacent area. The temporal and spatial variability of phytoplankton was monitored by a combination of monitoring buoys, pigment analysis and fast screening microscopy. The overall phytoplankton succession in the Fehmarn Belt area was found to be influenced primarily by the seasonal changes, where various diatoms dominated the spring and autumn blooms and flagellates like Chrysochromulina sp., Dictyocha speculum and various dinoflagellates were occasionally abundant in late spring and summer. The phytoplankton groups were remarkably uniform horizontally in the investigation area while large differences in both biomasses and composition of individual phytoplankton groups were seen vertically in the water column, especially in the summer periods, in which the two-layer exchange flow between the North Sea and the Baltic Sea is showing a particularly strong stratification in the Fehmarn Belt. The chlorophyll a concentrations ranged continuously from 1 to 3 μg/L at the three permanent buoy stations during the 2 years of monitoring, except for the spring and autumn blooms where chlorophyll a increased up to 18 μg/L in the spring of 2010 and up to 8 μg/L in the autumn of 2009. Recurrent blooms of filamentous cyanobacteria are common during the summer period in the Baltic Sea and adjacent areas, but excessive blooms of cyanobacteria did not occur in 2009 and 2010 in the Fehmarn Belt area. The combination of the HPLC pigment analysis method and monitoring buoys continuously measuring fluorescence at selected stations with fast screening of samples in the microscope proved advantageous for obtaining information on both the phytoplankton succession and dynamic and, at the same time, getting information on duration and intensity of the blooms as well as specific information on the dominant species present both temporally and spatially in the large Fehmarn Belt area.

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Acknowledgments

This work was carried out under contract to Femern A/S, and their consent to publish the results is gratefully acknowledged. We are grateful to Simon Wright, Australian Antarctic Division, CSIRO, for the CHEMTAX program ver. 1.95. M. Allerup is thanked for skilful technical assistance.

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Authors and Affiliations

  1. Department of Environment and Toxicology, DHI, Agern Allé 5, 2970, Hørsholm, Denmark

    Louise Schlüter

  2. Department of Ecology and Environment, DHI, Agern Allé 5, 2970, Hørsholm, Denmark

    Flemming Møhlenberg & Hanne Kaas

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  1. Louise Schlüter
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  2. Flemming Møhlenberg
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Correspondence to Louise Schlüter.

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Schlüter, L., Møhlenberg, F. & Kaas, H. Temporal and spatial variability of phytoplankton monitored by a combination of monitoring buoys, pigment analysis and fast screening microscopy in the Fehmarn Belt Estuary. Environ Monit Assess 186, 5167–5184 (2014). https://doi.org/10.1007/s10661-014-3767-9

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