Krill excretion boosts microbial activity in the Southern Ocean

12Citations
Citations of this article
28Readers
Mendeley users who have this article in their library.

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. © 2014 Arístegui et al.

Cite

CITATION STYLE

APA

Ariśtegui, J., Duarte, C. M., Reche, I., & Gómez-Pinchetti, J. L. (2014). Krill excretion boosts microbial activity in the Southern Ocean. PLoS ONE, 9(2). https://doi.org/10.1371/journal.pone.0089391

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free