Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Picocyanobacterial community structure and space-time dynamics in the subalpine Lake Maggiore (N. Italy) |
| Abstract | We investigated the community structure of freshwater picocyanobacteria (Pcy) in the oligotrophic subalpine Lake Maggiore (Northern Italy) using the least conserved sequences of the Internal Transcribed Spacer (ITS-1) fragment. The aim was to characterize the succession of Pcy Operational Taxonomic Units (OTUs) during a seasonal cycle at two environmental niches with distinctive light, temperature and mixing characteristics. ITS fragment length outlined a succession of OTUs from spring to summer, even in the absence of a pronounced spring peak. The vertical partitioning of Pcy OTUs down the water column, more evident in summer, indicates different community composition at the two depths. Redundancy Data Analysis (RDA) was carried out using temperature, pH and depth of mixing layer (Zm), which passed the Monte Carlo test (p<0.05). A correlation between axis 1 and temperature, pH and Zm of respectively 0.85, 0.64 and 0.61 was found. Our results indicate that lake thermal structure, defined by temperature and Zm, has a significant influence on the succession of Pcy OTUs and on their dynamics in colonizing different ecological niches in the vertical gradient. |
| Source | Journal of limnology (Online) 71 (1), pp. 95–103 |
| Journal | Journal of limnology (Online) |
| Editor | Istituto per lo Studio degli Ecosistemi, Pavia, Italia |
| Year | 2012 |
| Type | Articolo in rivista |
| DOI | 10.4081/jlimnol.2012.e9 |
| Authors | Callieri, Cristiana ; Caravati, Emanuele ;Corno, Gianluca;Bertoni, Roberto |
| Text | 219966 2012 10.4081/jlimnol.2012.e9 Picocyanobacterial community structure and space time dynamics in the subalpine Lake Maggiore N. Italy Callieri, Cristiana ; Caravati, Emanuele ;Corno, Gianluca;Bertoni, Roberto CNR ISE, Pallanza Verbania We investigated the community structure of freshwater picocyanobacteria Pcy in the oligotrophic subalpine Lake Maggiore Northern Italy using the least conserved sequences of the Internal Transcribed Spacer ITS 1 fragment. The aim was to characterize the succession of Pcy Operational Taxonomic Units OTUs during a seasonal cycle at two environmental niches with distinctive light, temperature and mixing characteristics. ITS fragment length outlined a succession of OTUs from spring to summer, even in the absence of a pronounced spring peak. The vertical partitioning of Pcy OTUs down the water column, more evident in summer, indicates different community composition at the two depths. Redundancy Data Analysis RDA was carried out using temperature, pH and depth of mixing layer Zm , which passed the Monte Carlo test p<0.05 . A correlation between axis 1 and temperature, pH and Zm of respectively 0.85, 0.64 and 0.61 was found. Our results indicate that lake thermal structure, defined by temperature and Zm, has a significant influence on the succession of Pcy OTUs and on their dynamics in colonizing different ecological niches in the vertical gradient. 71 Picocyanobacterial community structure and space time dynamics in the subalpine Lake Maggiore N. Italy 2012_A0_006.pdf Articolo in rivista Istituto per lo Studio degli Ecosistemi 1723 8633 Journal of limnology Online Journal of limnology Online J. limnol. Online Journal of limnology. Online CARAVATI EMANUELE roberto.bertoni BERTONI ROBERTO cristiana.callieri CALLIERI CRISTIANA gianluca.corno CORNO GIANLUCA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |