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Dissolved organic matter cycling by the sponge holobiont

AuthorsRix, Laura; Naumann, Malik S.; Goeij, Jasper M. de; Van Oevelen, Dick; Ribes, Marta ; Coma, Rafael ; Struck, Ulrich; Al-Horani, Fuad; Wild, Christian; Hentschel, U.
Issue Date25-Jun-2017
Citation10th Sponge World Conference: 69 (2017)
AbstractSponges are increasingly recognized as important ecosystem engineers due not only to their ability to provide and modify habitat for other benthic organisms, but also their ability to influence the cycling of key nutrients like carbon and nitrogen (1, 2). In particular, sponges have recently been shown to play a role in the recycling of dissolved organic matter (DOM) via the sponge loop (3, 4). DOM is a major carbon source for a variety of sponges (5-7), and it is hypothesized that the abundant communities of microbes harboured by sponges play a role in its uptake (2, 8, 9). However, the importance of these microbes for DOM uptake and the influence of DOM quality on processing by the sponge holobiont (i.e. the sponge host and its associated microbes) are still unknown. Here we used stable isotope tracer experiments to compare the processing of different DOM sources by high-microbial (HMA) and low-microbial abundance (LMA) sponges from the Mediterranean and Red Sea. All sponges examined assimilated DOM, but significant differences in the processing of the various DOM sources demonstrated that DOM quality affects its uptake by the sponge holobiont. Phospholipid-derived fatty acid analyses further indicated that the sponge host and its associated microbes may preferentially utilize certain types of DOM, suggesting there may be resource partitioning within the holobiont. Microbes also appeared to be more active in the processing of DOM in HMA compared with LMA sponges, but similar uptake rates suggest HMA and LMA sponges may utilize different strategies to take up DOM. Finally, we found evidence for the transfer of bacterial-assimilated DOM to the sponge host, providing new insights into the metabolic interactions between sponges and their associated-microbes
Description10th Sponge World Conference, 25-30 June 2017, Galway, Ireland.-- 1 page
Publisher version (URL)http://www.conference.ie/Conferences/menu.asp?menu=2398&Conference=489
Appears in Collections:(ICM) Comunicaciones congresos
(CEAB) Comunicaciones congresos
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