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Distribution and Growth of Aerobic Anoxygenic Phototrophs in the Mediterranean Sea

Authors

  • Eva Hojerová,

    1. Institute of Microbiology CAS, Opatovický mlýn, 379 81 Třeboň, Czechia
    2. Faculty of Science, University of South Bohemia, Branišovská 31, 370 05 České Budějovice, Czechia
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  • Michal Mašín,

    1. Institute of Microbiology CAS, Opatovický mlýn, 379 81 Třeboň, Czechia
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  • Christophe Brunet,

    1. Laboratory of Plankton Ecology and Evolution, Stazione Zoologica ‘A. Dohrn’, Villa Comunale, I-80121 Napoli, Italy
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  • Isabel Ferrera,

    1. Departament de Biologia Marina i Oceanografia, Institut de Ciències del Mar-CSIC, Pg Marítim de la Barceloneta 37-49, E08003 Barcelona, Catalunya, Spain
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  • Josep M. Gasol,

    1. Departament de Biologia Marina i Oceanografia, Institut de Ciències del Mar-CSIC, Pg Marítim de la Barceloneta 37-49, E08003 Barcelona, Catalunya, Spain
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  • Michal Koblížek

    Corresponding author
    1. Institute of Microbiology CAS, Opatovický mlýn, 379 81 Třeboň, Czechia
    2. Institute of Physical Biology, University of South Bohemia, Zámek 36, 373 33 Nové Hrady, Czechia
      E-mail koblizek@alga.cz; Tel. +420-384 340 432; Fax +420-384 340 415.
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E-mail koblizek@alga.cz; Tel. +420-384 340 432; Fax +420-384 340 415.

Summary

The distribution of aerobic anoxygenic phototrophs (AAPs) was surveyed in various regions of the Mediterranean Sea in spring and summer. These phototrophic bacteria were present within the euphotic layer at all sampled stations. The AAP abundances increased with increasing trophic status ranging from 2.5 × 103 cells per ml in oligotrophic Eastern Mediterranean up to 90 × 103 cells per ml in the Bay of Villefranche. Aerobic anoxygenic phototrophs made up on average 1–4% of total prokaryotes in low nutrient areas, whereas in coastal and more productive stations these organisms represented 3–11% of total prokaryotes. Diel bacteriochlorophyll a decay measurements showed that AAP community in the Western Mediterranean grew rapidly, at rates from 1.13 to 1.42 day−1. The lower AAP abundances registered in the most oligotrophic waters suggest that they are relatively poor competitors under nutrient limiting conditions. Instead, AAPs appear to be metabolically active organisms, which thrive better in more eutrophic environments providing the necessary substrates to maintain high growth rates.

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