Increase in photosynthetic efficiency as a strategy of planktonic organisms exploiting deep lake layers (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• Increase in photosynthetic efficiency as a strategy of planktonic organisms exploiting deep lake layers (Articolo in rivista) (literal)

Anno

• 2004-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1046/j.1365-2427.2003.01169.x (literal)

Alternative label

• Modenutti B.(1), Balseiro E.(1), Callieri C., Queimaliños C.(1), Bertoni R. (2004)
  Increase in photosynthetic efficiency as a strategy of planktonic organisms exploiting deep lake layers
  in Freshwater biology (Print)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Modenutti B.(1), Balseiro E.(1), Callieri C., Queimaliños C.(1), Bertoni R. (literal)

Pagina inizio

• 160 (literal)

Pagina fine

• 169 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 49 (literal)

Rivista

• Freshwater biology (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• (1) Laboratory of Limnology, Centro Regional Universitario Bariloche Universidad Nacional del Comahue, Quintral, Bariloche, Argentina (literal)

Titolo

• Increase in photosynthetic efficiency as a strategy of planktonic organisms exploiting deep lake layers (literal)

Abstract

• 1.The photosynthetic efficiencies of the mixotrophic ciliate Ophrydium naumanni and the autotrophic dinoflagellate Gymnodinium paradoxum were investigated using laboratory and field experiments in Lake Moreno Oeste (41°5'S and 71°33'W, 758 m a.s.l.), in the Nahuel Huapi System (North Patagonia, Argentina). 2. The effect of different underwater light intensities on net primary production (NPP) was assessed during one summer. Additionally, laboratory experiments were carried out to obtain photosynthesis-irradiance response curves for each species. 3. Ophrydium naumanni and G. paradoxum dominated the metalimnetic (30 m depth) deep chlorophyll maximum (DCM) in the lake. 4. Despite these deep higher abundances, the cell-specific production of both species was higher at 10 m than at 30 m (DCM) depth. In addition, at 5 m depth, NPP was reduced by PAR + UV-A radiation. 5. Both species exhibited a positive NPP at very low irradiance but the mixotrophic ciliate was more efficient in exploiting the DCM irradiance level both in situ and at comparable light intensities in laboratory experiments. Light acclimatised O. naumanni showed a higher NPP at lower irradiances and photoinhibition at medium and high irradiances. 6. Under the strong wind-driven turbulence commonly found in Patagonian lakes, organisms cannot select their position in the epilimnetic water column and will be dragged to potentially harmful UV radiation levels. Thus, metalimnetic DCM colonisation by these two species represents a tradeoff between higher survival and lower cell-specific NPP. (literal)

Prodotto di

• Istituto per lo studio degli ecosistemi (ISE) (Istituto)
• Impatto dei cambiamenti globali sugli ecosistemi acquatici (TA.P02.014.002) (Modulo)

Autore CNR

• CRISTIANA CALLIERI (Persona)
• ROBERTO BERTONI (Unità di personale interno)

Incoming links:

Autore CNR di

• CRISTIANA CALLIERI (Persona)
• ROBERTO BERTONI (Unità di personale interno)

Prodotto

• Istituto per lo studio degli ecosistemi (ISE) (Istituto)
• Impatto dei cambiamenti globali sugli ecosistemi acquatici (TA.P02.014.002) (Modulo)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Freshwater biology (Rivista)