Maximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.

The responses of heterotrophic microbial food webs (HMFW) to the joint action of abiotic stressors related to global change have been studied in an oligotrophic high-mountain lake. A 2×5 factorial design field experiment performed with large mesocosms for >2 months was used to quantify the dynami...

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Autores principales:	Juan Manuel Medina-Sánchez, José Antonio Delgado-Molina, Gunnar Bratbak, Francisco José Bullejos, Manuel Villar-Argaiz, Presentación Carrillo
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/78ffd877b64648cc918420b69b0c33e9
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spelling	oai:doaj.org-article:78ffd877b64648cc918420b69b0c33e92021-11-18T07:50:38ZMaximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.1932-620310.1371/journal.pone.0060223https://doaj.org/article/78ffd877b64648cc918420b69b0c33e92013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23593178/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203The responses of heterotrophic microbial food webs (HMFW) to the joint action of abiotic stressors related to global change have been studied in an oligotrophic high-mountain lake. A 2×5 factorial design field experiment performed with large mesocosms for >2 months was used to quantify the dynamics of the entire HMFW (bacteria, heterotrophic nanoflagellates, ciliates, and viruses) after an experimental P-enrichment gradient which approximated or surpassed current atmospheric P pulses in the presence vs. absence of ultraviolet radiation. HMFW underwent a mid-term (<20 days) acute development following a noticeable unimodal response to P enrichment, which peaked at intermediate P-enrichment levels and, unexpectedly, was more accentuated under ultraviolet radiation. However, after depletion of dissolved inorganic P, the HMFW collapsed and was outcompeted by a low-diversity autotrophic compartment, which constrained the development of HMFW and caused a significant loss of functional biodiversity. The dynamics and relationships among variables, and the response patterns found, suggest the importance of biotic interactions (predation/parasitism and competition) in restricting HMFW development, in contrast to the role of abiotic factors as main drivers of autotrophic compartment. The response of HMFW may contribute to ecosystem resilience by favoring the maintenance of the peculiar paths of energy and nutrient-mobilization in these pristine ecosystems, which are vulnerable to threats by the joint action of abiotic stressors related to global change.Juan Manuel Medina-SánchezJosé Antonio Delgado-MolinaGunnar BratbakFrancisco José BullejosManuel Villar-ArgaizPresentación CarrilloPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 4, p e60223 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Juan Manuel Medina-Sánchez José Antonio Delgado-Molina Gunnar Bratbak Francisco José Bullejos Manuel Villar-Argaiz Presentación Carrillo Maximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.
description	The responses of heterotrophic microbial food webs (HMFW) to the joint action of abiotic stressors related to global change have been studied in an oligotrophic high-mountain lake. A 2×5 factorial design field experiment performed with large mesocosms for >2 months was used to quantify the dynamics of the entire HMFW (bacteria, heterotrophic nanoflagellates, ciliates, and viruses) after an experimental P-enrichment gradient which approximated or surpassed current atmospheric P pulses in the presence vs. absence of ultraviolet radiation. HMFW underwent a mid-term (<20 days) acute development following a noticeable unimodal response to P enrichment, which peaked at intermediate P-enrichment levels and, unexpectedly, was more accentuated under ultraviolet radiation. However, after depletion of dissolved inorganic P, the HMFW collapsed and was outcompeted by a low-diversity autotrophic compartment, which constrained the development of HMFW and caused a significant loss of functional biodiversity. The dynamics and relationships among variables, and the response patterns found, suggest the importance of biotic interactions (predation/parasitism and competition) in restricting HMFW development, in contrast to the role of abiotic factors as main drivers of autotrophic compartment. The response of HMFW may contribute to ecosystem resilience by favoring the maintenance of the peculiar paths of energy and nutrient-mobilization in these pristine ecosystems, which are vulnerable to threats by the joint action of abiotic stressors related to global change.
format	article
author	Juan Manuel Medina-Sánchez José Antonio Delgado-Molina Gunnar Bratbak Francisco José Bullejos Manuel Villar-Argaiz Presentación Carrillo
author_facet	Juan Manuel Medina-Sánchez José Antonio Delgado-Molina Gunnar Bratbak Francisco José Bullejos Manuel Villar-Argaiz Presentación Carrillo
author_sort	Juan Manuel Medina-Sánchez
title	Maximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.
title_short	Maximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.
title_full	Maximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.
title_fullStr	Maximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.
title_full_unstemmed	Maximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.
title_sort	maximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/78ffd877b64648cc918420b69b0c33e9
work_keys_str_mv	AT juanmanuelmedinasanchez maximuminthemiddlenonlinearresponseofmicrobialplanktontoultravioletradiationandphosphorus AT joseantoniodelgadomolina maximuminthemiddlenonlinearresponseofmicrobialplanktontoultravioletradiationandphosphorus AT gunnarbratbak maximuminthemiddlenonlinearresponseofmicrobialplanktontoultravioletradiationandphosphorus AT franciscojosebullejos maximuminthemiddlenonlinearresponseofmicrobialplanktontoultravioletradiationandphosphorus AT manuelvillarargaiz maximuminthemiddlenonlinearresponseofmicrobialplanktontoultravioletradiationandphosphorus AT presentacioncarrillo maximuminthemiddlenonlinearresponseofmicrobialplanktontoultravioletradiationandphosphorus
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Maximum in the middle: nonlinear response of microbial plankton to ultraviolet radiation and phosphorus.

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