| Title | Picocyanobacterial assemblages in ultraoligotrophic Andean lakes reveal high regional microdiversity |
| Abstract | Picocyanobacteria (Pcy) diversity was studied in a set of ultraoligotrophic North Patagonian Andean lakes. The glacial lake system includes a central lake (Lake Nahuel Huapi, with its side basin, Lake Moreno) and four satellite lakes (Lakes Espejo, Correntoso, Gutie´rrez and Mascardi) derived from a larger paleolake. Automated ribosomal intergenic spacer analysis showed a Pcy community structure composed of 18 operational taxonomic units (OTUs), of which only one (OTU 1094) was widely distributed, being found at all depths in all of the lakes. Most of the others were observed in a few of the lakes. The principal component
analysis revealed the habitat specificity of some Pcy OTUs: the satellite lakes have a highly irradiated epilimnion, while the central lake has a well-mixed euphotic zone that does not extend beyond the epilimnion. We also observed a distinctive vertical distribution of the OTUs and a significant correlation between Pcy chlorophyll-specific primary production and OTU 738, which was only found in the satellite lakes. Lastly, the high ß-diversity of this lake district supports the hypothesis that microdiversity is higher in glacier-derived lake systems where habitat fragmentation due to geographic barriers results in rapid speciation. |
| Source | Journal of plankton research 32, pp. 357–366 |
| Keywords | picocyanobacteriaARISAlight gradientITSPatagonia |
| Journal | Journal of plankton research |
| Editor | Information Retrieval Inc.],, [New York,, Stati Uniti d'America |
| Year | 2010 |
| Type | Articolo in rivista |
| Authors | Caravati E., C. Callieri, B. Modenutti (1), G. Corno, E. Balseiro (1), R. Bertoni, L. Michaud (2) |
| Text | 53159 2010 picocyanobacteria ARISA light gradient ITS Patagonia Picocyanobacterial assemblages in ultraoligotrophic Andean lakes reveal high regional microdiversity Caravati E., C. Callieri, B. Modenutti 1 , G. Corno, E. Balseiro 1 , R. Bertoni, L. Michaud 2 1 Laboratorio de Limnologia, Inibioma CONICET Uncomahue , Quintral 1250, 8400 Bariloche, Argentina 2 Dipartimento di Biologia Animale ed Ecologica Marina, Universita degli Studi di Messina Picocyanobacteria Pcy diversity was studied in a set of ultraoligotrophic North Patagonian Andean lakes. The glacial lake system includes a central lake Lake Nahuel Huapi, with its side basin, Lake Moreno and four satellite lakes Lakes Espejo, Correntoso, Gutie´rrez and Mascardi derived from a larger paleolake. Automated ribosomal intergenic spacer analysis showed a Pcy community structure composed of 18 operational taxonomic units OTUs , of which only one OTU 1094 was widely distributed, being found at all depths in all of the lakes. Most of the others were observed in a few of the lakes. The principal component analysis revealed the habitat specificity of some Pcy OTUs the satellite lakes have a highly irradiated epilimnion, while the central lake has a well mixed euphotic zone that does not extend beyond the epilimnion. We also observed a distinctive vertical distribution of the OTUs and a significant correlation between Pcy chlorophyll specific primary production and OTU 738, which was only found in the satellite lakes. Lastly, the high ß diversity of this lake district supports the hypothesis that microdiversity is higher in glacier derived lake systems where habitat fragmentation due to geographic barriers results in rapid speciation. 32 Published version doi 10.1093/plankt/fbp126 Articolo in rivista Information Retrieval Inc. , 0142 7873 Journal of plankton research Journal of plankton research J. plankton res. Journal of plankton research. gianluca.corno CORNO GIANLUCA CARAVATI EMANUELE roberto.bertoni BERTONI ROBERTO cristiana.callieri CALLIERI CRISTIANA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |
