The interplay between nutrient load, N partitioning and turbulence: three key factors in the dynamics of coastal plankton

The interplay between nutrient load, N partitioning and turbulence: three key factors in the dynamics of coastal plankton

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Symposium on Integrating New Advances in Mediterranean Oceanography and Marine Biology, 26-29 November 2013, Institut de Ciències del Mar (CSIC), Barcelona, Catalunya, Spain

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Main Authors: Romero, Estela, Peters, Francesc, Marrasé, Cèlia, Guadayol, Òscar
Format: póster de congreso biblioteca
Published: 2013-11-26
Online Access:http://hdl.handle.net/10261/96662
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spelling dig-icm-es-10261-966622019-03-06T13:24:27Z The interplay between nutrient load, N partitioning and turbulence: three key factors in the dynamics of coastal plankton Romero, Estela Peters, Francesc Marrasé, Cèlia Guadayol, Òscar Symposium on Integrating New Advances in Mediterranean Oceanography and Marine Biology, 26-29 November 2013, Institut de Ciències del Mar (CSIC), Barcelona, Catalunya, Spain Two intensive surveys were conducted in the coastal waters of Barcelona (NW Mediterranean) to assess short-term variations of biological parameters in relation to environmental conditions. We focused on two attributes: wave height, as a proxy for mechanical energy entering the system, and nutrient inputs, whose variability in total load and relative composition is a central characteristic of coastal areas. The interplay between nutrients and turbulence was also studied by means of two experimental simulations with natural planktonic communities. Experimental nutrient additions varied both in terms of total nutrient load and in the balance of elements, with a particular focus on N sources. In the experiments, shifts in community composition appeared to be mostly related to the interaction between turbulence and N partitioning: under still conditions, ammoniumrich waters favored small organisms and reinforced the microbial loop, whereas nitrate mostly favored diatom growth. Turbulence added complexity to the final outcome, because mixing tended to favor large over small osmotrophs. The results suggested that the rapid growth of small autotrophs and heterotrophic bacteria in ammonium-rich waters could be partly counteracted by diatom increases if nutrient pulses were coupled with turbulent mixing, and diatom bursts after nitrate enrichments could be largely enhanced by concomitant turbulence. This was consistent with the observations in the field, where a fine balance between moderate mixing and nutrient availability pushed our system toward diverse trophic pathways: sudden nutrient fluxes uncoupled from water motion tended to favour bacteria and heterotrophic nanoflagellates, while their concurrence with some water-column mixing shaped a favorable scenario for large autotrophs. Ultimately, these two distinct biological responses pointed toward two main disturbance scenarios: Episodes of nutrient enrichment uncoupled from mixing, mostly related to episodic water spills from the nearby city; episodes of increased wind caused by passing weather fronts that promoted some water column mixing and the entrainment of nutrients from bottom sediments or from adjacent water masses Peer Reviewed 2014-05-14T08:45:24Z 2014-05-14T08:45:24Z 2013-11-26 2014-05-14T08:45:24Z póster de congreso http://purl.org/coar/resource_type/c_6670 Integrating New Advances in Mediterranean Oceanography and Marine Biology. Meeting program: 52 (2013) http://hdl.handle.net/10261/96662 http://www.icm.csic.es/bio/medocean/information.htm#schedule none
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
description Symposium on Integrating New Advances in Mediterranean Oceanography and Marine Biology, 26-29 November 2013, Institut de Ciències del Mar (CSIC), Barcelona, Catalunya, Spain
format póster de congreso
author Romero, Estela
Peters, Francesc
Marrasé, Cèlia
Guadayol, Òscar
spellingShingle Romero, Estela
Peters, Francesc
Marrasé, Cèlia
Guadayol, Òscar
The interplay between nutrient load, N partitioning and turbulence: three key factors in the dynamics of coastal plankton
author_facet Romero, Estela
Peters, Francesc
Marrasé, Cèlia
Guadayol, Òscar
author_sort Romero, Estela
title The interplay between nutrient load, N partitioning and turbulence: three key factors in the dynamics of coastal plankton
title_short The interplay between nutrient load, N partitioning and turbulence: three key factors in the dynamics of coastal plankton
title_full The interplay between nutrient load, N partitioning and turbulence: three key factors in the dynamics of coastal plankton
title_fullStr The interplay between nutrient load, N partitioning and turbulence: three key factors in the dynamics of coastal plankton
title_full_unstemmed The interplay between nutrient load, N partitioning and turbulence: three key factors in the dynamics of coastal plankton
title_sort interplay between nutrient load, n partitioning and turbulence: three key factors in the dynamics of coastal plankton
publishDate 2013-11-26
url http://hdl.handle.net/10261/96662
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