Coral Reefs

, Volume 36, Issue 4, pp 1171–1179 | Cite as

Effects of coral-derived organic matter on the growth of bacterioplankton and heterotrophic nanoflagellates

  • Ryota Nakajima
  • Yasuaki Tanaka
  • Ryan Guillemette
  • Haruko Kurihara
Report

Abstract

Exudates derived from hermatypic corals were incubated with <2 µm filtered seawater containing heterotrophic bacteria and <10 µm filtered seawater containing bacteria and nanoflagellates (HNF) under dark conditions for 96 h to quantify the growth of both bacteria and HNF in response to coral-derived dissolved organic matter (DOM). The addition of coral-derived DOM caused significantly higher growth rates and production of bacteria and HNF compared to those in control seawater without coral exudates. During the incubation, HNF exhibited their peak in abundance 24–48 h after the peak abundance of bacteria. The growth efficiencies of both bacteria and HNF were significantly higher with coral-derived DOM, suggesting higher transfer efficiency from bacteria that is fueled by coral organic matter to HNF. Therefore, trophic transfer of coral-derived DOM from bacteria to HNF can contribute to efficient carbon flow through the microbial food web.

Keywords

Bacteria Coral mucus DOC Microbial food web Heterotrophic nanoflagellates (HNF) 

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Scripps Institution of OceanographyUniversity of California San DiegoLa JollaUSA
  2. 2.Faculty of ScienceUniversiti Brunei DarussalamGadongBrunei Darussalam
  3. 3.Faculty of ScienceUniversity of the RyukyusNishiharaJapan

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