INVESTIGADORES
RODRIGUEZ patricia laura
artículos
Título:
Size fractionated phytoplankton production in two humic shallow lakes with contrasting coverage of free floating plants
Autor/es:
RODRÍGUEZ, PATRICIA; PIZARRO, HAYDÉE; VERA, M. SOLANGE
Revista:
HYDROBIOLOGIA
Editorial:
SPRINGER
Referencias:
Lugar: Bruselas; Año: 2012 p. 1 - 16
ISSN:
0018-8158
Resumen:
We conducted a 1-year survey in twohumic shallow lakes from the floodplain of the LowerParana´ River, Laguna Grande Lake (LGL) and arelictual oxbow lake (ROL). We aimed to test twohypotheses: (1) the efficiency in light use of picoplankton(0.2–3 lm) is greater as light restrictionincreases and (2) the contribution of picoplankton tothe total productivity is higher when the total photosyntheticbiomass is lower. We performed P–E curvesfor picoplankton and nano- and microplankton([3 lm) using the 14C assimilation technique. Thelight environments of the water bodies differed mainlyowing to the development of free floating plants on thesurface of the ROL and the dominance of phytoplanktonin LGL. Primary productivity patterns in LGLwere seasonality driven whilst in the ROL they wererelated to the coverage of floating macrophytes, whichpromoted light limitation and a lower productivity. InLGL, nano- and microplankton were in general moreproductive and the relative contribution of picoplanktonto the total phytoplankton production decreasedwith the increase in total photosynthetic biomass.Hence, our study extends previously observed patternsto subtropical shallow lakes, where seasonality andfree floating plants may influence the dynamics ofphytoplankton production.