Does B12 vitamin limit phytoplankton growth in the new Iberian Peninsula?

Abstract

Event Abstract Back to Event Does B12 vitamin limit phytoplankton growth in the new Iberian Peninsula? Esther Barber Lluch1*, Marta Hernández Ruiz1, Antero Prieto1, Eva Teira1 and Emilio Fernández1 1 University of Vigo, Animal Ecology and Biology, Spain The effects of increasing nutrient inputs entering to oceanic and coastal environments on primary producers are hardly predictable. Phytoplankton responses to nutrient supply depend on the autotrophic-heterotrophic coupling and a profound understanding of this interaction is required to describe response patterns. A series of microcosm experiments were carried out to assess the response of primary producers to nutrient amendments and to elucidate the role of B-vitamins on phytoplankton growth in coastal waters off the NW Iberian peninsula. Surface autotrophic microbial populations were monthly collected and exposed to known nutrient concentrations and incubated under in situ light and temperature conditions. The experimental addition treatments included: a) inorganic nutrients (nitrate, ammonium and phosphate); b) B12 vitamin (cobalamin) and c) inorganic nutrients and cobalamin. On two occasions, four additional treatments were included: d) organic nutrients (glucose and amino acids); e) a combination of inorganic and organic nutrients; f) organic nutrients and cobalamin; g) inorganic and organic nutrients plus cobalamin. Amendment experiments lasted 4 days. Samples were collected every 24h for Chlorophyll-a concentration, pico- and nanoplankton abundance and heterotrophic bacterial abundance determination. Our results suggest that phytoplankton growth is co-limited by inorganic nutrients and B12-vitamin. This co-limitation varied along the study period likely related to changes in community composition and ambient nutrient and B-vitamins concentrations. Keywords: cobalamin, co-limitation, addition experiments, NW Iberian Peninsula, Microbial Interactions Conference: IMMR | International Meeting on Marine Research 2014, Peniche, Portugal, 10 Jul - 11 Jul, 2014. Presentation Type: Poster Presentation Topic: BIODIVERSITY, CONSERVATION AND COASTAL MANAGEMENT Citation: Barber Lluch E, Hernández Ruiz M, Prieto A, Teira E and Fernández E (2014). Does B12 vitamin limit phytoplankton growth in the new Iberian Peninsula?. Front. Mar. Sci. Conference Abstract: IMMR | International Meeting on Marine Research 2014. doi: 10.3389/conf.fmars.2014.02.00081 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 09 May 2014; Published Online: 18 Jul 2014. * Correspondence: Miss. Esther Barber Lluch, University of Vigo, Animal Ecology and Biology, Vigo, Spain, esther_barber@hotmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Esther Barber Lluch Marta Hernández Ruiz Antero Prieto Eva Teira Emilio Fernández Google Esther Barber Lluch Marta Hernández Ruiz Antero Prieto Eva Teira Emilio Fernández Google Scholar Esther Barber Lluch Marta Hernández Ruiz Antero Prieto Eva Teira Emilio Fernández PubMed Esther Barber Lluch Marta Hernández Ruiz Antero Prieto Eva Teira Emilio Fernández Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.