Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon
We analyzed the coupling between bacterioplankton and phytoplankton in Laguna de Rocha through an experimental approach. A freshwater zone of high turbidity and macrophytes growth and a brackish zone of higher light penetration and lower macrophytes biomass characterize this coastal lagoon. It has b...
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| Format: | Article |
| Language: | English |
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PAGEPress Publications
2014-03-01
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| Series: | Journal of Limnology |
| Subjects: | |
| Online Access: | http://www.jlimnol.it/index.php/jlimnol/article/view/829 |
| _version_ | 1818244386447687680 |
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| author | Germán Pérez Laura Farías Camila Fernandez Daniel Conde Claudia Piccini |
| author_facet | Germán Pérez Laura Farías Camila Fernandez Daniel Conde Claudia Piccini |
| author_sort | Germán Pérez |
| collection | DOAJ |
| description | We analyzed the coupling between bacterioplankton and phytoplankton in Laguna de Rocha through an experimental approach. A freshwater zone of high turbidity and macrophytes growth and a brackish zone of higher light penetration and lower macrophytes biomass characterize this coastal lagoon. It has been shown that dissolved inorganic nitrogen, especially NH4+, has decreased to undetectable levels during the last decade. One hypothesis for this trend is the rapid removal by phytoplankton and bacterioplankton uptake. In an attempt to test this, we performed incubations using lagoon water from both zones split in two treatments (pre-filtered by 1.2 µm and unfiltered water) and amended with 15N-NH4+. After 4 h incubation we found that in both zones bacterioplankton showed significantly higher NH4+ uptake rates when incubated together with phytoplankton and that uptake rates of both microbial communities were higher in freshwater incubations. These results suggest that bacterial NH4+ uptake would be coupled to phytoplankton-derived exudates and hence that depletion of dissolved NH4+ in this system could be linked to rapid microbial uptake. The degree of this coupling would vary according to hydrological dynamics in this ecosystem. |
| first_indexed | 2024-12-12T14:16:12Z |
| format | Article |
| id | doaj.art-24f4e7f800ba42be9c2735fdf4cad92c |
| institution | Directory Open Access Journal |
| issn | 1129-5767 1723-8633 |
| language | English |
| last_indexed | 2024-12-12T14:16:12Z |
| publishDate | 2014-03-01 |
| publisher | PAGEPress Publications |
| record_format | Article |
| series | Journal of Limnology |
| spelling | doaj.art-24f4e7f800ba42be9c2735fdf4cad92c2022-12-22T00:21:53ZengPAGEPress PublicationsJournal of Limnology1129-57671723-86332014-03-0173110.4081/jlimnol.2014.829621Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoonGermán Pérez0Laura Farías1Camila Fernandez2Daniel Conde3Claudia Piccini4Instituto de Investigaciones Biológicas Clemente EstableUniversidad de ConcepciónUPMC Univ. Paris 06 and CNRS, UMR 7621Universidad de la RepúblicaInstituto de Investigaciones Biológicas Clemente EstableWe analyzed the coupling between bacterioplankton and phytoplankton in Laguna de Rocha through an experimental approach. A freshwater zone of high turbidity and macrophytes growth and a brackish zone of higher light penetration and lower macrophytes biomass characterize this coastal lagoon. It has been shown that dissolved inorganic nitrogen, especially NH4+, has decreased to undetectable levels during the last decade. One hypothesis for this trend is the rapid removal by phytoplankton and bacterioplankton uptake. In an attempt to test this, we performed incubations using lagoon water from both zones split in two treatments (pre-filtered by 1.2 µm and unfiltered water) and amended with 15N-NH4+. After 4 h incubation we found that in both zones bacterioplankton showed significantly higher NH4+ uptake rates when incubated together with phytoplankton and that uptake rates of both microbial communities were higher in freshwater incubations. These results suggest that bacterial NH4+ uptake would be coupled to phytoplankton-derived exudates and hence that depletion of dissolved NH4+ in this system could be linked to rapid microbial uptake. The degree of this coupling would vary according to hydrological dynamics in this ecosystem.http://www.jlimnol.it/index.php/jlimnol/article/view/829ammonium uptake rates, coastal lagoon, microbial interactions. |
| spellingShingle | Germán Pérez Laura Farías Camila Fernandez Daniel Conde Claudia Piccini Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon Journal of Limnology ammonium uptake rates, coastal lagoon, microbial interactions. |
| title | Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon |
| title_full | Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon |
| title_fullStr | Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon |
| title_full_unstemmed | Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon |
| title_short | Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon |
| title_sort | incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon |
| topic | ammonium uptake rates, coastal lagoon, microbial interactions. |
| url | http://www.jlimnol.it/index.php/jlimnol/article/view/829 |
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