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A light-induced shortcut in the planktonic microbial loop
Mixotrophs combine photosynthesis with phagotrophy to cover their demands in energy and essential nutrients. This gives them a competitive advantage under oligotropihc conditions, where nutrients and bacteria concentrations are low. As the advantage for the mixotroph depends on light, the competitio...
Autores principales: | , , , , , , , , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4941531/ https://www.ncbi.nlm.nih.gov/pubmed/27404551 http://dx.doi.org/10.1038/srep29286 |
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author | Ptacnik, Robert Gomes, Ana Royer, Sarah-Jeanne Berger, Stella A. Calbet, Albert Nejstgaard, Jens C. Gasol, Josep M. Isari, Stamatina Moorthi, Stefanie D. Ptacnikova, Radka Striebel, Maren Sazhin, Andrey F. Tsagaraki, Tatiana M. Zervoudaki, Soultana Altoja, Kristi Dimitriou, Panagiotis D. Laas, Peeter Gazihan, Ayse Martínez, Rodrigo A. Schabhüttl, Stefanie Santi, Ioulia Sousoni, Despoina Pitta, Paraskevi |
author_facet | Ptacnik, Robert Gomes, Ana Royer, Sarah-Jeanne Berger, Stella A. Calbet, Albert Nejstgaard, Jens C. Gasol, Josep M. Isari, Stamatina Moorthi, Stefanie D. Ptacnikova, Radka Striebel, Maren Sazhin, Andrey F. Tsagaraki, Tatiana M. Zervoudaki, Soultana Altoja, Kristi Dimitriou, Panagiotis D. Laas, Peeter Gazihan, Ayse Martínez, Rodrigo A. Schabhüttl, Stefanie Santi, Ioulia Sousoni, Despoina Pitta, Paraskevi |
author_sort | Ptacnik, Robert |
collection | PubMed |
description | Mixotrophs combine photosynthesis with phagotrophy to cover their demands in energy and essential nutrients. This gives them a competitive advantage under oligotropihc conditions, where nutrients and bacteria concentrations are low. As the advantage for the mixotroph depends on light, the competition between mixo- and heterotrophic bacterivores should be regulated by light. To test this hypothesis, we incubated natural plankton from the ultra-oligotrophic Eastern Mediterranean in a set of mesocosms maintained at 4 light levels spanning a 10-fold light gradient. Picoplankton (heterotrophic bacteria (HB), pico-sized cyanobacteria, and small-sized flagellates) showed the fastest and most marked response to light, with pronounced predator-prey cycles, in the high-light treatments. Albeit cell specific activity of heterotrophic bacteria was constant across the light gradient, bacterial abundances exhibited an inverse relationship with light. This pattern was explained by light-induced top-down control of HB by bacterivorous phototrophic eukaryotes (PE), which was evidenced by a significant inverse relationship between HB net growth rate and PE abundances. Our results show that light mediates the impact of mixotrophic bacterivores. As mixo- and heterotrophs differ in the way they remineralize nutrients, these results have far-reaching implications for how nutrient cycling is affected by light. |
format | Online Article Text |
id | pubmed-4941531 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-49415312016-07-20 A light-induced shortcut in the planktonic microbial loop Ptacnik, Robert Gomes, Ana Royer, Sarah-Jeanne Berger, Stella A. Calbet, Albert Nejstgaard, Jens C. Gasol, Josep M. Isari, Stamatina Moorthi, Stefanie D. Ptacnikova, Radka Striebel, Maren Sazhin, Andrey F. Tsagaraki, Tatiana M. Zervoudaki, Soultana Altoja, Kristi Dimitriou, Panagiotis D. Laas, Peeter Gazihan, Ayse Martínez, Rodrigo A. Schabhüttl, Stefanie Santi, Ioulia Sousoni, Despoina Pitta, Paraskevi Sci Rep Article Mixotrophs combine photosynthesis with phagotrophy to cover their demands in energy and essential nutrients. This gives them a competitive advantage under oligotropihc conditions, where nutrients and bacteria concentrations are low. As the advantage for the mixotroph depends on light, the competition between mixo- and heterotrophic bacterivores should be regulated by light. To test this hypothesis, we incubated natural plankton from the ultra-oligotrophic Eastern Mediterranean in a set of mesocosms maintained at 4 light levels spanning a 10-fold light gradient. Picoplankton (heterotrophic bacteria (HB), pico-sized cyanobacteria, and small-sized flagellates) showed the fastest and most marked response to light, with pronounced predator-prey cycles, in the high-light treatments. Albeit cell specific activity of heterotrophic bacteria was constant across the light gradient, bacterial abundances exhibited an inverse relationship with light. This pattern was explained by light-induced top-down control of HB by bacterivorous phototrophic eukaryotes (PE), which was evidenced by a significant inverse relationship between HB net growth rate and PE abundances. Our results show that light mediates the impact of mixotrophic bacterivores. As mixo- and heterotrophs differ in the way they remineralize nutrients, these results have far-reaching implications for how nutrient cycling is affected by light. Nature Publishing Group 2016-07-11 /pmc/articles/PMC4941531/ /pubmed/27404551 http://dx.doi.org/10.1038/srep29286 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Ptacnik, Robert Gomes, Ana Royer, Sarah-Jeanne Berger, Stella A. Calbet, Albert Nejstgaard, Jens C. Gasol, Josep M. Isari, Stamatina Moorthi, Stefanie D. Ptacnikova, Radka Striebel, Maren Sazhin, Andrey F. Tsagaraki, Tatiana M. Zervoudaki, Soultana Altoja, Kristi Dimitriou, Panagiotis D. Laas, Peeter Gazihan, Ayse Martínez, Rodrigo A. Schabhüttl, Stefanie Santi, Ioulia Sousoni, Despoina Pitta, Paraskevi A light-induced shortcut in the planktonic microbial loop |
title | A light-induced shortcut in the planktonic microbial loop |
title_full | A light-induced shortcut in the planktonic microbial loop |
title_fullStr | A light-induced shortcut in the planktonic microbial loop |
title_full_unstemmed | A light-induced shortcut in the planktonic microbial loop |
title_short | A light-induced shortcut in the planktonic microbial loop |
title_sort | light-induced shortcut in the planktonic microbial loop |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4941531/ https://www.ncbi.nlm.nih.gov/pubmed/27404551 http://dx.doi.org/10.1038/srep29286 |
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