Significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system
14 pages, 7 figures, 1 table
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American Society of Limnology and Oceanography
2007
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dig-icm-es-10261-267682020-11-12T09:41:19Z Significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system Unrein, Fernando Massana, Ramon Alonso-Sáez, Laura Gasol, Josep M. 14 pages, 7 figures, 1 table The seasonal variation in the grazing effect of mixotrophic flagellates on bacterioplankton was assessed during an annual cycle in an oligotrophic coastal station in the northwest Mediterranean Sea. Ingestion rates of fluorescently labeled bacteria were estimated for different size categories of phytoflagellates (PF) and heterotrophic flagellates (HF) in short-term experiments and compared with long-term grazing estimates and published empirical models. The mixotrophic flagellates included haptophyte-like cells, cryptophytes, and dinoflagellates. The group-specific grazing rates (SGR) averaged 1.1 (3–5 µm PF), 1.3 (5–20 µm PF), 4.0 (<5 µm HF), and 15.4 bacteria individual-1 h-1 (5–20 µm HF). Lower SGR but higher abundances of PF resulted in an average mixotroph contribution of 50% to the total flagellate grazing. Remarkably, the effect was relatively high all through the year (35–65%). Regardless of the presence of chloroplasts, flagellates <5 mm in size accounted, on average, for about 80% of total flagellate bacterivory and ingested a large percentage of their cell carbon per day from bacteria. Soluble reactive phosphorus concentration was negatively correlated with the ingestion rate of both groups of PF, suggesting that mixotrophic flagellates would be using their phagotrophic capability to obtain phosphorus when this nutrient is limiting. HF grazing activity showed a marked seasonality, with grazing being higher during the warmer seasons, and clearance rates were positively correlated with water temperature. Total bacterivory accounted for most of the bacterial production. Short-term and long-term bacterivory measurements were highly correlated, confirming that the smallest flagellates were the main causative agent of bacterial loss. The bacterivory values were also well correlated to a published empirical model that considers HF as the only bacterivorous. However, this model underestimated (up to 50%) total flagellate grazing during periods of high effect of mixotrophic flagellates This study was supported mainly by a EU project (EVK3-CT-2002-00078) and a Spanish post-doctoral fellowship (SB2001-0166) and also partially funded by three projects supported by the Spanish government (REN2001-2120/MAR; CTM2004-12631/MAR; CTM2004-02586/MAR) Peer reviewed 2010-08-03T09:14:10Z 2010-08-03T09:14:10Z 2007 artículo http://purl.org/coar/resource_type/c_6501 Limnology and Oceanography 52(1): 456-469 (2007) 0024-3590 http://hdl.handle.net/10261/26768 10.4319/lo.2007.52.1.0456 en https://doi.org/10.4319/lo.2007.52.1.0456 open 5867 bytes application/pdf American Society of Limnology and Oceanography |
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biblioteca |
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Biblioteca del ICM España |
| language |
English |
| description |
14 pages, 7 figures, 1 table |
| format |
artículo |
| author |
Unrein, Fernando Massana, Ramon Alonso-Sáez, Laura Gasol, Josep M. |
| spellingShingle |
Unrein, Fernando Massana, Ramon Alonso-Sáez, Laura Gasol, Josep M. Significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system |
| author_facet |
Unrein, Fernando Massana, Ramon Alonso-Sáez, Laura Gasol, Josep M. |
| author_sort |
Unrein, Fernando |
| title |
Significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system |
| title_short |
Significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system |
| title_full |
Significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system |
| title_fullStr |
Significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system |
| title_full_unstemmed |
Significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system |
| title_sort |
significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system |
| publisher |
American Society of Limnology and Oceanography |
| publishDate |
2007 |
| url |
http://hdl.handle.net/10261/26768 |
| work_keys_str_mv |
AT unreinfernando significantyearroundeffectofsmallmixotrophicflagellatesonbacterioplanktoninanoligotrophiccoastalsystem AT massanaramon significantyearroundeffectofsmallmixotrophicflagellatesonbacterioplanktoninanoligotrophiccoastalsystem AT alonsosaezlaura significantyearroundeffectofsmallmixotrophicflagellatesonbacterioplanktoninanoligotrophiccoastalsystem AT gasoljosepm significantyearroundeffectofsmallmixotrophicflagellatesonbacterioplanktoninanoligotrophiccoastalsystem |
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1777665748031766528 |