Distribution of Picophytoplankton Communities from Brackish to Hypersaline Waters in a South Australian Coastal Lagoon


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dc.contributor.author Schapira, Mathilde en_US
dc.contributor.author Buscot, Marie-Jeanne en_US
dc.contributor.author Pollet, Thomas en_US
dc.contributor.author Leterme, Sophie C en_US
dc.contributor.author Seuront, Laurent en_US
dc.date.accessioned 2012-01-11T23:21:00Z
dc.date.available 2012-01-11T23:21:00Z
dc.date.copyright 2010 en_US
dc.date.issued 2010-2-24 en_US
dc.identifier.citation Schapira, Mathilde, Marie-Jeanne Buscot, Thomas Pollet, Sophie C Leterme, Laurent Seuront. "Distribution of picophytoplankton communities from brackish to hypersaline waters in a South Australian coastal lagoon" Saline Systems 6:2. (2010) en_US
dc.identifier.issn 1746-1448 en_US
dc.identifier.uri http://hdl.handle.net/2144/3343
dc.description.abstract BACKGROUND. Picophytoplankton (i.e. cyanobacteria and pico-eukaryotes) are abundant and ecologically critical components of the autotrophic communities in the pelagic realm. These micro-organisms colonized a variety of extreme environments including high salinity waters. However, the distribution of these organisms along strong salinity gradient has barely been investigated. The abundance and community structure of cyanobacteria and pico-eukaryotes were investigated along a natural continuous salinity gradient (1.8% to 15.5%) using flow cytometry. RESULTS. Highest picophytoplankton abundances were recorded under salinity conditions ranging between 8.0% and 11.0% (1.3 × 106 to 1.4 × 106 cells ml-1). Two populations of picocyanobacteria (likely Synechococcus and Prochlorococcus) and 5 distinct populations of pico-eukaryotes were identified along the salinity gradient. The picophytoplankton cytometric-richness decreased with salinity and the most cytometrically diversified community (4 to 7 populations) was observed in the brackish-marine part of the lagoon (i.e. salinity below 3.5%). One population of pico-eukaryote dominated the community throughout the salinity gradient and was responsible for the bloom observed between 8.0% and 11.0%. Finally only this halotolerant population and Prochlorococcus-like picocyanobacteria were identified in hypersaline waters (i.e. above 14.0%). Salinity was identified as the main factor structuring the distribution of picophytoplankton along the lagoon. However, nutritive conditions, viral lysis and microzooplankton grazing are also suggested as potentially important players in controlling the abundance and diversity of picophytoplankton along the lagoon. CONCLUSIONS. The complex patterns described here represent the first observation of picophytoplankton dynamics along a continuous gradient where salinity increases from 1.8% to 15.5%. This result provides new insight into the distribution of pico-autotrophic organisms along strong salinity gradients and allows for a better understanding of the overall pelagic functioning in saline systems which is critical for the management of these precious and climatically-stress ecosystems. en_US
dc.description.sponsorship Australian Research Council (DP0664681, DP0988554); Flinders University en_US
dc.language.iso en en_US
dc.publisher BioMed Central en_US
dc.rights Copyright 2010 Schapira et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. en_US
dc.rights.uri http://creativecommons.org/licenses/by/2.0 en_US
dc.title Distribution of Picophytoplankton Communities from Brackish to Hypersaline Waters in a South Australian Coastal Lagoon en_US
dc.type article en_US
dc.identifier.doi 10.1186/1746-1448-6-2 en_US
dc.identifier.pubmedid 20178652 en_US
dc.identifier.pmcid 2847571 en_US

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