Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Balance between primary and bacterial production in North Patagonian shallow lakes |
| Abstract | The shallow Andean North Patagonian lakes are suitable environments for the evaluation of autotrophic and heterotrophic production under a scenario of high radiation in high dissolved organic matter (DOM) systems. We aimed to study the balance between primary and bacterial production in three shallow Andean lakes, in a summer sampling (high irradiance condition). Our hypothesis is that two factors would interact: high light and high DOM, affecting bacteria and algae. We carried out experiments of bacterial production (BP) by measuring [14C]-L-leucine incorporation and PP by 14C uptake in two fractions: picophytoplankton and phytoplankton >2 lm. Cell abundance, chlorophyll a, nutrients, DOM, light, and temperature were also measured. The contribution of picophytoplankton to total primary production (PP) was, in general, very high exceeding 50%. Picophytoplankton was photosynthetically more efficient than the larger autotrophs in all lakes. We observed a decrease in PP at surface levels due the high solar irradiances, while BP was not affected. Changes in the PP:BP ratios were observed in relation to DOM content and light effect. Our data indicate that the amount of available DOM drives the balance between PP and BP. However, solar radiation should be included as an important factor since PP:BP ratio may decrease because of PP photoinhibition. |
| Source | Aquatic ecology (Print) 43, pp. 867–878 |
| Keywords | Picophytoplankton e PhytoplanktonDissolved organic matterBacterioplanktonPrimary and bacterial productionShallow Andean lakes |
| Journal | Aquatic ecology (Print) |
| Editor | Kluwer Academic Publishers, Boston, Paesi Bassi |
| Year | 2009 |
| Type | Articolo in rivista |
| Authors | Bastidas Navarro M. (1), B. Modenutti (1), C. Callieri, R. Bertoni & E. Balseiro (1) |
| Text | 53137 2009 Picophytoplankton e Phytoplankton Dissolved organic matter Bacterioplankton Primary and bacterial production Shallow Andean lakes Balance between primary and bacterial production in North Patagonian shallow lakes Bastidas Navarro M. 1 , B. Modenutti 1 , C. Callieri, R. Bertoni E. Balseiro 1 1 Laboratorio de Limnolog1a, INIBIOMA UNC CONICET , Quintral 1250, 8400 Bariloche, Argentina The shallow Andean North Patagonian lakes are suitable environments for the evaluation of autotrophic and heterotrophic production under a scenario of high radiation in high dissolved organic matter DOM systems. We aimed to study the balance between primary and bacterial production in three shallow Andean lakes, in a summer sampling high irradiance condition . Our hypothesis is that two factors would interact high light and high DOM, affecting bacteria and algae. We carried out experiments of bacterial production BP by measuring 14C L leucine incorporation and PP by 14C uptake in two fractions picophytoplankton and phytoplankton >2 lm. Cell abundance, chlorophyll a, nutrients, DOM, light, and temperature were also measured. The contribution of picophytoplankton to total primary production PP was, in general, very high exceeding 50%. Picophytoplankton was photosynthetically more efficient than the larger autotrophs in all lakes. We observed a decrease in PP at surface levels due the high solar irradiances, while BP was not affected. Changes in the PP BP ratios were observed in relation to DOM content and light effect. Our data indicate that the amount of available DOM drives the balance between PP and BP. However, solar radiation should be included as an important factor since PP BP ratio may decrease because of PP photoinhibition. 43 Published version Articolo in rivista Kluwer Academic Publishers 1386 2588 Aquatic ecology Print Aquatic ecology Print Aquat. ecol. Print Aquatic ecology. Print roberto.bertoni BERTONI ROBERTO cristiana.callieri CALLIERI CRISTIANA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |