| Title | Distribution patterns and environmental correlates of Thaumarchaeota abundance in six deep subalpine lakes |
| Abstract | The presence of the mesophilic Thaumarchaeota (Thaum) in deep lakes seems to be restricted to oligotrophic lakes, where they have been found in the deep hypolimnion. We evaluated the vertical distribution of Thaum in six subalpine deep lakes, in spring and summer, to ascertain if there was a Thaum vertical gradient common to all the lakes in the region, possibly related to lake mixing and stratification. We examined nine environmental variables potentially correlated with Thaum abundance. Thaum abundance ranged from 0.61 9 103 to 236 9 103 cells mL-1, representing between 0.02 and 19 % of total prokaryotic cells, in the six lakes across different seasons. Although their absolute and relative abundance varied along the trophic gradient and with mixing conditions, a general pattern common to all the deep lakes was observed. In summer, the abundance of Thaum significantly increased with depth in all the lakes. Temperature emerged as the main environmental correlate of Thaum abundance in deep subalpine lakes. In spring, at low water temperature their abundance was significantly higher in warmer lakes and lower in colder lakes. Conversely, in summer, the correlation with temperature was inverse and Thaum thrived preferentially in the colder hypolimnion. |
| Source | Aquatic sciences (Print. ed.) 78 (2), pp. 215–225 |
| Keywords | Subalpine lakesThaumarchaeotavertical profileCARD FISHHypolimnion |
| Journal | Aquatic sciences (Print. ed.) |
| Editor | Birkhäuser, Basel, Svizzera |
| Year | 2016 |
| Type | Articolo in rivista |
| DOI | 10.1007/s00027-015-0418-3 |
| Authors | Cristiana Callieri; Salvador Hernandez-Aviles; Michaela M. Salcher; Diego Fontaneto; Roberto Bertoni |
| Text | 333710 2016 10.1007/s00027 015 0418 3 Subalpine lakes Thaumarchaeota vertical profile CARD FISH Hypolimnion Distribution patterns and environmental correlates of Thaumarchaeota abundance in six deep subalpine lakes Cristiana Callieri; Salvador Hernandez Aviles; Michaela M. Salcher; Diego Fontaneto; Roberto Bertoni CNR ISE, Institute of Ecosystem Study, Largo Tonolli 50, 28922 Verbania Pallanza, Italy; Department of Limnology, UNAM, FES Zaragoza, Av. Guelatao 66, 09230 Iztapalapa, DF, Mexico Biology Centre of the ASCR, Institute of Hydrobiology, Na Sadkach 7, 37005 Ceske Budejovice, Czech Republic The presence of the mesophilic Thaumarchaeota Thaum in deep lakes seems to be restricted to oligotrophic lakes, where they have been found in the deep hypolimnion. We evaluated the vertical distribution of Thaum in six subalpine deep lakes, in spring and summer, to ascertain if there was a Thaum vertical gradient common to all the lakes in the region, possibly related to lake mixing and stratification. We examined nine environmental variables potentially correlated with Thaum abundance. Thaum abundance ranged from 0.61 9 103 to 236 9 103 cells mL 1, representing between 0.02 and 19 % of total prokaryotic cells, in the six lakes across different seasons. Although their absolute and relative abundance varied along the trophic gradient and with mixing conditions, a general pattern common to all the deep lakes was observed. In summer, the abundance of Thaum significantly increased with depth in all the lakes. Temperature emerged as the main environmental correlate of Thaum abundance in deep subalpine lakes. In spring, at low water temperature their abundance was significantly higher in warmer lakes and lower in colder lakes. Conversely, in summer, the correlation with temperature was inverse and Thaum thrived preferentially in the colder hypolimnion. 78 Published version http //link.springer.com/article/10.1007/s00027 015 0418 3 AqSci Callieri 2015_AquSci_Callieri_et_al_EV.pdf Articolo in rivista Birkhauser 1015 1621 Aquatic sciences Print. ed. Aquatic sciences Print. ed. Aquat. sci. Print. ed. Aquatic sciences. Print. ed. roberto.bertoni BERTONI ROBERTO cristiana.callieri CALLIERI CRISTIANA diego.fontaneto FONTANETO DIEGO |
