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Algicidal bacteria trigger contrasting responses in model diatom communities of different composition

Algicidal bacteria are important players regulating the dynamic changes of plankton assemblages. Most studies on these bacteria have focused on the effect on single algal species in simple incubation experiments. Considering the complexity of species assemblages in the natural plankton, such incubat...

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Detalles Bibliográficos
Autores principales: Bigalke, Arite, Pohnert, Georg
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6692526/
https://www.ncbi.nlm.nih.gov/pubmed/30809963
http://dx.doi.org/10.1002/mbo3.818
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author Bigalke, Arite
Pohnert, Georg
author_facet Bigalke, Arite
Pohnert, Georg
author_sort Bigalke, Arite
collection PubMed
description Algicidal bacteria are important players regulating the dynamic changes of plankton assemblages. Most studies on these bacteria have focused on the effect on single algal species in simple incubation experiments. Considering the complexity of species assemblages in the natural plankton, such incubations represent an oversimplification and do not allow making further reaching conclusions on ecological interactions. Here, we describe a series of co‐incubation experiments with different level of complexity to elucidate the effect of the algicidal bacterium Kordia algicida on mixed cultures of a resistant and a susceptible diatom. The growth of the resistant diatom Chaetoceros didymus is nearly unaffected by K. algicida in monoculture, while cells of the susceptible diatom Skeletonema costatum are lysed within few hours. Growth of C. didymus is inhibited if mixed cultures of the two diatoms are infected with the bacterium. Incubations with filtrates of the infected cultures show that the effects are chemically mediated. In non‐contact co‐culturing we show that low concentrations of the lysed algae support the growth of C. didymus, while higher concentrations trigger population decline. Complex cascading effects of algicidal bacteria have thus to be taken into account if their ecological role is concerned.
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spelling pubmed-66925262019-08-16 Algicidal bacteria trigger contrasting responses in model diatom communities of different composition Bigalke, Arite Pohnert, Georg Microbiologyopen Original Articles Algicidal bacteria are important players regulating the dynamic changes of plankton assemblages. Most studies on these bacteria have focused on the effect on single algal species in simple incubation experiments. Considering the complexity of species assemblages in the natural plankton, such incubations represent an oversimplification and do not allow making further reaching conclusions on ecological interactions. Here, we describe a series of co‐incubation experiments with different level of complexity to elucidate the effect of the algicidal bacterium Kordia algicida on mixed cultures of a resistant and a susceptible diatom. The growth of the resistant diatom Chaetoceros didymus is nearly unaffected by K. algicida in monoculture, while cells of the susceptible diatom Skeletonema costatum are lysed within few hours. Growth of C. didymus is inhibited if mixed cultures of the two diatoms are infected with the bacterium. Incubations with filtrates of the infected cultures show that the effects are chemically mediated. In non‐contact co‐culturing we show that low concentrations of the lysed algae support the growth of C. didymus, while higher concentrations trigger population decline. Complex cascading effects of algicidal bacteria have thus to be taken into account if their ecological role is concerned. John Wiley and Sons Inc. 2019-02-27 /pmc/articles/PMC6692526/ /pubmed/30809963 http://dx.doi.org/10.1002/mbo3.818 Text en © 2019 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Bigalke, Arite
Pohnert, Georg
Algicidal bacteria trigger contrasting responses in model diatom communities of different composition
title Algicidal bacteria trigger contrasting responses in model diatom communities of different composition
title_full Algicidal bacteria trigger contrasting responses in model diatom communities of different composition
title_fullStr Algicidal bacteria trigger contrasting responses in model diatom communities of different composition
title_full_unstemmed Algicidal bacteria trigger contrasting responses in model diatom communities of different composition
title_short Algicidal bacteria trigger contrasting responses in model diatom communities of different composition
title_sort algicidal bacteria trigger contrasting responses in model diatom communities of different composition
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6692526/
https://www.ncbi.nlm.nih.gov/pubmed/30809963
http://dx.doi.org/10.1002/mbo3.818
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