Molecular composition and biodegradation of loggerhead sponge Spheciospongia vesparium exhalent dissolved organic matter.

Autor: Letourneau ML; Department of Marine Sciences, University of Georgia, Athens, GA, 30602, USA., Hopkinson BM; Department of Marine Sciences, University of Georgia, Athens, GA, 30602, USA., Fitt WK; Odum School of Ecology, University of Georgia, Athens, GA, 30602, USA., Medeiros PM; Department of Marine Sciences, University of Georgia, Athens, GA, 30602, USA. Electronic address: medeiros@uga.edu.
Jazyk: angličtina
Zdroj: Marine environmental research [Mar Environ Res] 2020 Dec; Vol. 162, pp. 105130. Date of Electronic Publication: 2020 Sep 06.
DOI: 10.1016/j.marenvres.2020.105130
Abstrakt: Sponges are critical components of marine reefs due to their high filtering capacity, wide abundance, and alteration of biogeochemical cycling. Here, we characterized dissolved organic matter (DOM) composition in the sponge holobiont exhalent seawater of a loggerhead sponge (Spheciospongia vesparium) and in ambient seawater in Florida Bay (USA), as well as the microbial responses to each DOM pool through dark incubations. The sponge holobiont removed 6% of the seawater dissolved organic carbon (DOC), utilizing compounds that were low in carbon and oxygen, yet high in nitrogen content relative to the ambient seawater. The microbial community accessed 7% of DOC from the ambient seawater during a 5-day incubation but only 1% of DOC from the sponge exhalent seawater, suggesting a decrease in lability possibly due to holobiont removal of nitrogen-rich compounds. If this holds true for other sponges, it may have important implications for DOM lability and cycling in coastal environments.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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