Vulnerability of mixotrophic algae to nutrient pulses and UVR in an oligotrophic Southern and Northern Hemisphere lake

Abstract Nutrient inputs and ultraviolet radiation (UVR) are global factors affecting the structure and functioning of aquatic ecosystems, particularly clear-water ecosystems. We performed experiments in two model lakes highly exposed to UVR fluxes in order to test the effect that future increases i...

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Autores principales:	P. Carrillo, J. M. Medina-Sánchez, M. Villar-Argaiz, F. J. Bullejos, C. Durán, M. Bastidas-Navarro, M. S. Souza, E. G. Balseiro, B. E. Modenutti
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/60b206c883a24c019ef05c90b0bfeeb7
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spelling	oai:doaj.org-article:60b206c883a24c019ef05c90b0bfeeb72021-12-02T15:05:49ZVulnerability of mixotrophic algae to nutrient pulses and UVR in an oligotrophic Southern and Northern Hemisphere lake10.1038/s41598-017-06279-92045-2322https://doaj.org/article/60b206c883a24c019ef05c90b0bfeeb72017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06279-9https://doaj.org/toc/2045-2322Abstract Nutrient inputs and ultraviolet radiation (UVR) are global factors affecting the structure and functioning of aquatic ecosystems, particularly clear-water ecosystems. We performed experiments in two model lakes highly exposed to UVR fluxes in order to test the effect that future increases in mineral nutrients transported by dust aerosol might exert on primary producers depending on the likelihood of atmospheric inputs. Lake La Caldera (Northern Hemisphere) has been receiving recurrent dust inputs from the Sahara Desert while lake Los Cántaros (Southern Hemisphere) has been less affected by dust aerosol. UVR × Nutrient synergistically stimulated primary production (PP), chlorophyll a (Chl a), with a smaller increase in phytoplanktonic biomass in La Caldera, but not in Los Cántaros, where nutrient addition unmasked the UVR inhibitory effect on phytoplankton. The proportional decrease of mixotrophic nanoflagellates (MNFs) after the nutrient pulse (in Los Cántaros) and the long-term decline of MNFs in La Caldera associated with the increase in aerosol-dust intrusions from the Sahara during the last 40 years suggest that a future scenario of intensified aerosol events from desert and desertified areas would not only reduce functional diversity with the decline of MNFs, but would ultimately alter the C flux towards the grazing chain in oligotrophic ecosystems.P. CarrilloJ. M. Medina-SánchezM. Villar-ArgaizF. J. BullejosC. DuránM. Bastidas-NavarroM. S. SouzaE. G. BalseiroB. E. ModenuttiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q P. Carrillo J. M. Medina-Sánchez M. Villar-Argaiz F. J. Bullejos C. Durán M. Bastidas-Navarro M. S. Souza E. G. Balseiro B. E. Modenutti Vulnerability of mixotrophic algae to nutrient pulses and UVR in an oligotrophic Southern and Northern Hemisphere lake
description	Abstract Nutrient inputs and ultraviolet radiation (UVR) are global factors affecting the structure and functioning of aquatic ecosystems, particularly clear-water ecosystems. We performed experiments in two model lakes highly exposed to UVR fluxes in order to test the effect that future increases in mineral nutrients transported by dust aerosol might exert on primary producers depending on the likelihood of atmospheric inputs. Lake La Caldera (Northern Hemisphere) has been receiving recurrent dust inputs from the Sahara Desert while lake Los Cántaros (Southern Hemisphere) has been less affected by dust aerosol. UVR × Nutrient synergistically stimulated primary production (PP), chlorophyll a (Chl a), with a smaller increase in phytoplanktonic biomass in La Caldera, but not in Los Cántaros, where nutrient addition unmasked the UVR inhibitory effect on phytoplankton. The proportional decrease of mixotrophic nanoflagellates (MNFs) after the nutrient pulse (in Los Cántaros) and the long-term decline of MNFs in La Caldera associated with the increase in aerosol-dust intrusions from the Sahara during the last 40 years suggest that a future scenario of intensified aerosol events from desert and desertified areas would not only reduce functional diversity with the decline of MNFs, but would ultimately alter the C flux towards the grazing chain in oligotrophic ecosystems.
format	article
author	P. Carrillo J. M. Medina-Sánchez M. Villar-Argaiz F. J. Bullejos C. Durán M. Bastidas-Navarro M. S. Souza E. G. Balseiro B. E. Modenutti
author_facet	P. Carrillo J. M. Medina-Sánchez M. Villar-Argaiz F. J. Bullejos C. Durán M. Bastidas-Navarro M. S. Souza E. G. Balseiro B. E. Modenutti
author_sort	P. Carrillo
title	Vulnerability of mixotrophic algae to nutrient pulses and UVR in an oligotrophic Southern and Northern Hemisphere lake
title_short	Vulnerability of mixotrophic algae to nutrient pulses and UVR in an oligotrophic Southern and Northern Hemisphere lake
title_full	Vulnerability of mixotrophic algae to nutrient pulses and UVR in an oligotrophic Southern and Northern Hemisphere lake
title_fullStr	Vulnerability of mixotrophic algae to nutrient pulses and UVR in an oligotrophic Southern and Northern Hemisphere lake
title_full_unstemmed	Vulnerability of mixotrophic algae to nutrient pulses and UVR in an oligotrophic Southern and Northern Hemisphere lake
title_sort	vulnerability of mixotrophic algae to nutrient pulses and uvr in an oligotrophic southern and northern hemisphere lake
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/60b206c883a24c019ef05c90b0bfeeb7
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Vulnerability of mixotrophic algae to nutrient pulses and UVR in an oligotrophic Southern and Northern Hemisphere lake

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