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Aquatic Microbial Ecology

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AME 77:51-63 (2016)  -  DOI:

Released coral mucus does not enhance planktonic N2 fixation rates

Mercedes Camps1,4,*, Mar Benavides1,4, Kimberley A. Lema2,3, David G. Bourne3, Olivier Grosso4, Sophie Bonnet1,4

1Institut de Recherche pour le Développement, AMU/CNRS/INSU, Université de Toulon, Mediterranean Institute of Oceanography (MIO) UM 110, 98848 Nouméa, New Caledonia
2IFREMER, Dyneco Pelagos, 29280 Plouzané, France
3Centre for Marine Microbiology and Genetics, Australian Institute of Marine Science, PMB 3, Townsville MC, Queensland 4810, Australia
4Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, 13288 Marseille, France
*Corresponding author:

ABSTRACT: Dinitrogen (N2) fixation by prokaryotic microorganisms provides bioavailable nitrogen in oligotrophic marine ecosystems such as coral reefs. The widespread though largely unknown heterotrophic diazotrophs require dissolved organic matter (DOM) for their nutrition. In coral reef ecosystems, DOM-rich mucus released by corals potentially sustains heterotrophic diazotrophic growth and activity. In this study, we investigated the effect of coral mucus on planktonic N2 fixation in in situ experiments over a seasonal cycle within a New Caledonian lagoon, as well as in in vitro experiments in which the effect of mucus was monitored for 72 h. During the field experiment, N2 fixation rates ranged between 0.12 and 7.90 nmol N l-1 d-1. Despite the highest N2 fixation being found after mucus release, no significant difference was measured between the seawater surrounding the coral before and after mucus release. Similarly, the addition of mucus during the in vitro experiment enhanced N2 fixation rates 1.5-fold, but this increase was not significantly different from the control. The abundance of 2 dominant populations of diazotrophs associated with corals and their surrounding seawater environments (unicellular cyanobacteria and rhizobia) found within pure mucus samples was on average 18-fold higher than in the surrounding seawater in the summer period and 400-fold higher in the winter. Our results suggest that although coral mucus does not influence planktonic N2 fixation, the release of large numbers of diazotrophic cells associated with the mucus likely influences the abundance and diversity of diazotroph populations within the lagoon waters.

KEY WORDS: Diazotrophs · Coral mucus · Dissolved organic matter · Pelagic-benthic interactions

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Cite this article as: Camps M, Benavides M, Lema KA, Bourne DG, Grosso O, Bonnet S (2016) Released coral mucus does not enhance planktonic N2 fixation rates. Aquat Microb Ecol 77:51-63.

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