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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/31141

Title: Krill Excretion Boosts Microbial Activity in the Southern Ocean
Authors: Arístegui, Javier
Duarte Quesada, Carlos Manuel
Reche Cañabate, Isabel
Gómez-Pinchetti, Juan L.
Issue Date: 2014
Abstract: Antarctic krill are known to release large amounts of inorganic and organic nutrients to the water column. Here we test the role of krill excretion of dissolved products in stimulating heterotrophic bacteria on the basis of three experiments where ammonium and organic excretory products released by krill were added to bacterial assemblages, free of grazers. Our results demonstrate that the addition of krill excretion products (but not of ammonium alone), at levels expected in krill swarms, greatly stimulates bacteria resulting in an order-of-magnitude increase in growth and production. Furthermore, they suggest that bacterial growth rate in the Southern Ocean is suppressed well below their potential by resource limitation. Enhanced bacterial activity in the presence of krill, which are major sources of DOC in the Southern Ocean, would further increase recycling processes associated with krill activity, resulting in highly efficient krill-bacterial recycling that should be conducive to stimulating periods of high primary productivity in the Southern Ocean.
Sponsorship: This research is a contribution to projects ICEPOS (REN2002-04165-CO3-O2) and ATOS (POL2006-00550/CTM), funded by the Spanish Ministry of Science and Innovation.
Publisher: Public Library of Science (PLOS)
Keywords: Antartic Ocean
Bacterial growth
Marine bacteria
Sea water
URI: http://hdl.handle.net/10481/31141
ISSN: 1932-6203
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Arístegui, J.; Duarte, C.M.; Reche, I.; Gómez-Pinchetti, J.L. Krill Excretion Boosts Microbial Activity in the Southern Ocean. Plos One, 9(2): e89391 (2014). [http://hdl.handle.net/10481/31141]
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