Abstract
In the eutrophic Ghar El Melh Lagoon (GML, Tunisia), the distribution of heterotrophic prokaryotes, pico- and nanophytoplankton was studied at five stations in November 2012 at the single cell level, along with environmental factors. Flow cytometry analysis of ultraplankton (<10 μm) resolved (i) two heterotrophic prokaryote groups, low and high nucleic acid contents (LNA and HNA, respectively), and (ii) eight to nine ultraphytoplankton groups (cryptophyte-like cells, two nanoeukaryote subgroups, two picoeukaryote subgroups and three Synechococcus-like cells subgroups). Prochlorococcus was not detected. According to redundancy analysis (RDA), a significant difference was found in the distribution of the ultraplankton between stations (F = 2.61, p < 0.05); maximum proliferations of heterotrophic prokaryotes were observed in the inner parts of the lagoon at stations 3, 4 and 5 affected by urban, agricultural and industrial discharges. Ultraphytoplankton concentrations were the highest near the outlet of the lagoon at stations 1 and 2 influenced by freshwater outflow and oligotrophic Mediterranean water inflow, respectively. At station 1, the large ultraphytoplankton concentration derives from the high abundance of cryptophyte-like cells favoured by the freshwater outflow whereas at station 2, the input of oligotrophic Mediterranean water enhanced the abundance of Synechococcus and picoeukaryotes at the expense of nanoeukaryotes. Two trophic regimes were thus differentiated in GML.
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Acknowledgements
This study was conducted by Amel DHIB as a part of her PhD research (co-directed at the University of Franche-Comté, CNRS 6249, Besançon, France, and at the Institut National des Sciences et Technologie de la Mer, Tunisia). The authors thank Serge Nitsche, head of the SEM facility at the Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), for providing access to SEM and for his helpful assistance. We thank the anonymous reviewers whose comments have helped to greatly improve the manuscript.
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Dhib, A., Denis, M., Ziadi, B. et al. Assessing ultraphytoplankton and heterotrophic prokaryote composition by flow cytometry in a Mediterranean lagoon. Environ Sci Pollut Res 24, 13710–13721 (2017). https://doi.org/10.1007/s11356-017-8939-z
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DOI: https://doi.org/10.1007/s11356-017-8939-z