Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/11614
Title: Krill excretion boosts microbial activity in the Southern Ocean
Authors: Aristegui, Javier 
Duarte, Carlos M.
Reche, Isabel
Gómez-Pinchetti, Juan Luis 
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Dissolved Organic-Carbon
Western Antarctic Peninsula
Natural Planktonic Bacteria
Euphausia-Superba
Marine-Bacteria
Heterotrophic Bacteria
Flow-Cytometry
Fecal Pellets
Scotia Sea
Food-Web
Issue Date: 2014
Journal: PLoS ONE 
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.
URI: http://hdl.handle.net/10553/11614
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0089391
Source: Plos One [ISSN 1932-6203],v. 9 (2)
Rights: by-nc-nd
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