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DatoValore
TitleBacterial grazing by mixotrophic flagellates and Daphnia longispina: a comparison in a fishless alpine lake
AbstractWe compared the bacterivory of mixotrophic flagellates (MxFl) and of Daphnia longispina in a fishless high altitude lake with a simple food web. During the ice-free period of Lago Paione Superiore (LPS, Italian Central Alps) we measured species-specific direct uptake of fluorescently labelled bacteria (FLB) by MxFl and D. longispina. Bacterial production of DNA and protein and dissolved organic carbon (DOC) were also measured. Between ice melt and September, the most common groups of MxFl in the lake were Gymnodinium spp., Dinobryon sertulaiia, Chromulina spp. and Ochromonas sp. On average they ingested 2.9, 3.7, 9.3 and 14.6 bacterial cells ind.(-1) h(-1), respectively, whereas D. longispina ingested 1.9 x 10(6) bacterial cells ind.(-1)h(-1). The MxFl community ingestion rate was always higher than the rate of D. longispina, except in mid August when the D. longispina population ingested 2.4 times more bacteria than MxFl. Rates of MxFI and D. longispina grazing did not show any significant correlation with bacterial abundance and biomass (p Spearman, p > 0.05), but a significant correlation was found between MxFI grazing and thymidine uptake at 9 m (p Spearman = 0.821, p < 0.014, xy pairs = 7). It appears that D. longispina actively feeds on bacteria when it first appears in the lake, but that overall the D. longispina population had a lesser impact on bacteria than did MxFl.
SourceAquatic microbial ecology 42 (2), pp. 127–137
Keywordsmixotrophic flagellate grazingDaphnia longispina grazingfluorescently labelled bacteriaFLBbacterial productionalpine lakeLago Paione Superiore
JournalAquatic microbial ecology
EditorInter-Research., Oldendorf/Luhe, Germania
Year2006
TypeArticolo in rivista
DOI10.3354/ame042127
AuthorsCallieri, C; Corno, G; Bertoni, R
Text407742 2006 10.3354/ame042127 ISI Web of Science WOS 000237261900003 mixotrophic flagellate grazing Daphnia longispina grazing fluorescently labelled bacteria FLB bacterial production alpine lake Lago Paione Superiore Bacterial grazing by mixotrophic flagellates and Daphnia longispina a comparison in a fishless alpine lake Callieri, C; Corno, G; Bertoni, R CNR We compared the bacterivory of mixotrophic flagellates MxFl and of Daphnia longispina in a fishless high altitude lake with a simple food web. During the ice free period of Lago Paione Superiore LPS, Italian Central Alps we measured species specific direct uptake of fluorescently labelled bacteria FLB by MxFl and D. longispina. Bacterial production of DNA and protein and dissolved organic carbon DOC were also measured. Between ice melt and September, the most common groups of MxFl in the lake were Gymnodinium spp., Dinobryon sertulaiia, Chromulina spp. and Ochromonas sp. On average they ingested 2.9, 3.7, 9.3 and 14.6 bacterial cells ind. 1 h 1 , respectively, whereas D. longispina ingested 1.9 x 10 6 bacterial cells ind. 1 h 1 . The MxFl community ingestion rate was always higher than the rate of D. longispina, except in mid August when the D. longispina population ingested 2.4 times more bacteria than MxFl. Rates of MxFI and D. longispina grazing did not show any significant correlation with bacterial abundance and biomass p Spearman, p > 0.05 , but a significant correlation was found between MxFI grazing and thymidine uptake at 9 m p Spearman = 0.821, p < 0.014, xy pairs = 7 . It appears that D. longispina actively feeds on bacteria when it first appears in the lake, but that overall the D. longispina population had a lesser impact on bacteria than did MxFl. 42 Published version Articolo in rivista Inter Research. 0948 3055 Aquatic microbial ecology Aquatic microbial ecology Aquat. microb. ecol. Aquatic microbial ecology. AME. Aquatic microbial ecology Aquatic microbial ecology Print AME Oldenburg roberto.bertoni BERTONI ROBERTO cristiana.callieri CALLIERI CRISTIANA gianluca.corno CORNO GIANLUCA