INVESTIGADORES
RODRIGUEZ patricia laura
artículos
Título:
Macrophyte influence on the structure and productivity of photosynthetic picoplankton in wetlands
Autor/es:
IZAGUIRRE, IRINA; PIZARRO, HAYDÉE; DE TEZANOS PINTO, P.; RODRÍGUEZ, PATRICIA; O´FARRELL, INÉS; UNREIN, F.; GASOL, J.
Revista:
JOURNAL OF PLANKTON RESEARCH
Editorial:
Oxford Journals
Referencias:
Año: 2010 vol. 32 p. 221 - 238
ISSN:
0142-7873
Resumen:
We used multiple approaches to analyze photosynthetic picoplankton (PPP) structure
and production in a wetland in the Lower Parana´ Basin (Argentina). A seasonal field
survey was combined with an experimental study to analyze PPP variability under
different light conditions. Flow cytometry analyses showed differences in PPP structure
among the aquatic environments. Three main picoplankton populations were distinguished:
phycocyanin-rich picocyanobacteria (Pcy), picoeukaryote (Peuk) and anaerobic
anoxygenic photosynthetic bacteria (AnAnPB). The experimental study revealed
important changes in PPP structure in relation to the light conditions imposed by
floating plants: enclosures exposed to light showed a higher proportion of Peuk and
Pcy over AnAnPB; in mesocosms covered by plants, just as in the highly vegetated
relict lakes (ROLs), AnAnPB were dominant. Total picophytoplankton abundances
varied from 1.7 104 to 4.6 105 cells mL21 in the shallow lakes, and were lower
(0.69 104 to 2.5 105 cells mL21) in the ROLs. Annual variations in temperature
and hydrological conditions influenced the PPP abundances, observing maximum
values during the warm dry phase. The photosynthetic rates per unit area of PPP
(PAPPP) and algae .3 mm (PA.3 mm) were measured in the aquatic environments in
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
and hydrological conditions influenced the PPP abundances, observing maximum
values during the warm dry phase. The photosynthetic rates per unit area of PPP
(PAPPP) and algae .3 mm (PA.3 mm) were measured in the aquatic environments in
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
(0.69 104 to 2.5 105 cells mL21) in the ROLs. Annual variations in temperature
and hydrological conditions influenced the PPP abundances, observing maximum
values during the warm dry phase. The photosynthetic rates per unit area of PPP
(PAPPP) and algae .3 mm (PA.3 mm) were measured in the aquatic environments in
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
and hydrological conditions influenced the PPP abundances, observing maximum
values during the warm dry phase. The photosynthetic rates per unit area of PPP
(PAPPP) and algae .3 mm (PA.3 mm) were measured in the aquatic environments in
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
104 to 4.6 105 cells mL21 in the shallow lakes, and were lower
(0.69 104 to 2.5 105 cells mL21) in the ROLs. Annual variations in temperature
and hydrological conditions influenced the PPP abundances, observing maximum
values during the warm dry phase. The photosynthetic rates per unit area of PPP
(PAPPP) and algae .3 mm (PA.3 mm) were measured in the aquatic environments in
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
and hydrological conditions influenced the PPP abundances, observing maximum
values during the warm dry phase. The photosynthetic rates per unit area of PPP
(PAPPP) and algae .3 mm (PA.3 mm) were measured in the aquatic environments in
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
104 to 2.5 105 cells mL21) in the ROLs. Annual variations in temperature
and hydrological conditions influenced the PPP abundances, observing maximum
values during the warm dry phase. The photosynthetic rates per unit area of PPP
(PAPPP) and algae .3 mm (PA.3 mm) were measured in the aquatic environments in
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
APPP) and algae .3 mm (PA.3 mm) were measured in the aquatic environments in
winter and summer: PA PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.
was directly affected by light, which was limiting under the dense floating plant cover.
A PPP (1.5 to 100 mg C m22h21) was lower than PA .3 mm and
was directly affected by light, which was limiting under the dense floating plant cover.