The molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.

Eukaryotic microorganisms have been undersampled in biodiversity studies in freshwater environments. We present an original 18S rDNA survey of freshwater picoeukaryotes sampled during spring/summer 2005, complementing an earlier study conducted in autumn 2004 in Lake Pavin (France). These studies we...

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Autores principales:	Emilie Lefèvre, Balbine Roussel, Christian Amblard, Télesphore Sime-Ngando
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2008
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5749bf204a2b482a940a3283eedbb2ec
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spelling	oai:doaj.org-article:5749bf204a2b482a940a3283eedbb2ec2021-11-25T06:12:07ZThe molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.1932-620310.1371/journal.pone.0002324https://doaj.org/article/5749bf204a2b482a940a3283eedbb2ec2008-06-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/18545660/?tool=EBIhttps://doaj.org/toc/1932-6203Eukaryotic microorganisms have been undersampled in biodiversity studies in freshwater environments. We present an original 18S rDNA survey of freshwater picoeukaryotes sampled during spring/summer 2005, complementing an earlier study conducted in autumn 2004 in Lake Pavin (France). These studies were designed to detect the small unidentified heterotrophic flagellates (HF, 0.6-5 microm) which are considered the main bacterivores in aquatic systems. Alveolates, Fungi and Stramenopiles represented 65% of the total diversity and differed from the dominant groups known from microscopic studies. Fungi and Telonemia taxa were restricted to the oxic zone which displayed two fold more operational taxonomic units (OTUs) than the oxycline. Temporal forcing also appeared as a driving force in the diversification within targeted organisms. Several sequences were not similar to those in databases and were considered as new or unsampled taxa, some of which may be typical of freshwater environments. Two taxa known from marine systems, the genera Telonema and Amoebophrya, were retrieved for the first time in our freshwater study. The analysis of potential trophic strategies displayed among the targeted HF highlighted the dominance of parasites and saprotrophs, and provided indications that these organisms have probably been wrongfully regarded as bacterivores in previous studies. A theoretical exercise based on a new 'parasite/saprotroph-dominated HF hypothesis' demonstrates that the inclusion of parasites and saprotrophs may increase the functional role of the microbial loop as a link for carbon flows in pelagic ecosystems. New interesting perspectives in aquatic microbial ecology are thus opened.Emilie LefèvreBalbine RousselChristian AmblardTélesphore Sime-NgandoPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 3, Iss 6, p e2324 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Emilie Lefèvre Balbine Roussel Christian Amblard Télesphore Sime-Ngando The molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.
description	Eukaryotic microorganisms have been undersampled in biodiversity studies in freshwater environments. We present an original 18S rDNA survey of freshwater picoeukaryotes sampled during spring/summer 2005, complementing an earlier study conducted in autumn 2004 in Lake Pavin (France). These studies were designed to detect the small unidentified heterotrophic flagellates (HF, 0.6-5 microm) which are considered the main bacterivores in aquatic systems. Alveolates, Fungi and Stramenopiles represented 65% of the total diversity and differed from the dominant groups known from microscopic studies. Fungi and Telonemia taxa were restricted to the oxic zone which displayed two fold more operational taxonomic units (OTUs) than the oxycline. Temporal forcing also appeared as a driving force in the diversification within targeted organisms. Several sequences were not similar to those in databases and were considered as new or unsampled taxa, some of which may be typical of freshwater environments. Two taxa known from marine systems, the genera Telonema and Amoebophrya, were retrieved for the first time in our freshwater study. The analysis of potential trophic strategies displayed among the targeted HF highlighted the dominance of parasites and saprotrophs, and provided indications that these organisms have probably been wrongfully regarded as bacterivores in previous studies. A theoretical exercise based on a new 'parasite/saprotroph-dominated HF hypothesis' demonstrates that the inclusion of parasites and saprotrophs may increase the functional role of the microbial loop as a link for carbon flows in pelagic ecosystems. New interesting perspectives in aquatic microbial ecology are thus opened.
format	article
author	Emilie Lefèvre Balbine Roussel Christian Amblard Télesphore Sime-Ngando
author_facet	Emilie Lefèvre Balbine Roussel Christian Amblard Télesphore Sime-Ngando
author_sort	Emilie Lefèvre
title	The molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.
title_short	The molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.
title_full	The molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.
title_fullStr	The molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.
title_full_unstemmed	The molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.
title_sort	molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.
publisher	Public Library of Science (PLoS)
publishDate	2008
url	https://doaj.org/article/5749bf204a2b482a940a3283eedbb2ec
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The molecular diversity of freshwater picoeukaryotes reveals high occurrence of putative parasitoids in the plankton.

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