INVESTIGADORES
MODENUTTI Beatriz Estela
artículos
Título:
Increase in photosynthetic efficiency as a strategy of planktonic organisms exploiting deep lake layers.
Autor/es:
BEATRIZ ESTELA MODENUTTI O BEATRIZ MODENUTTI O B. MODENUTTI; E BALSEIRO,; CRISTIANA CALLIERI,; CP QUEIMALIÑOS,; ROBERTO BERTONI,
Revista:
FRESHWATER BIOLOGY (PRINT)
Editorial:
Blackwell
Referencias:
Lugar: Inglaterra; Año: 2004 vol. 49 p. 160 - 169
ISSN:
0046-5070
Resumen:
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 (415¢S and 7133¢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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
field experiments in Lake Moreno Oeste (415¢S and 7133¢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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
autotrophic dinoflagellate Gymnodinium paradoxum were investigated using laboratory and
field experiments in Lake Moreno Oeste (415¢S and 7133¢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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
field experiments in Lake Moreno Oeste (415¢S and 7133¢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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Ophrydium naumanni and the
autotrophic dinoflagellate Gymnodinium paradoxum were investigated using laboratory and
field experiments in Lake Moreno Oeste (415¢S and 7133¢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.
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.
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.
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.
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.
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.
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.
higher NPP at lower irradiances and photoinhibition at medium and high irradiances.
6. Under the strong wind-driven turbulence commonly found in Patagonian lakes,