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Abstract:

This field experimental study simultaneously analysed the effects of predation (top-down) and nutrients (bottom-up) on planktonic communities (phytoplankton, zooplankton, heterotrophic nanoflagellates and ciliates) in a warm temperate wetland in South America. The top-down and bottom-up controls were investigated by assessing the impact of omnivorous-planktivorous fish (Jenynsia sp.) and the effects of nutrient input from natural lake sediments, respectively. Three treatments and a control were run in triplicate in mesocosms and samples were taken at Days 0, 3, 7 and 15. The control contained all the planktonic components while treatments included all planktonic components plus the addition of either planktivorous fish (F), natural wetland sediments in dialysis bags (S) or both of them (SF). A bottom-up effect due to nutrient release from sediment (mainly total phosphorus) was noticed in treatments S and SF. Phytoplankton abundance increased in all treatments compared with the control. Thus, phytoplankton appeared to be bottom-up controlled while fish exerted a strong predation pressure on zooplankton (top-down), because treatments F and SF showed a marked decrease in mesozooplankton abundance. The results obtained in this study agree with the hypothesis that phytoplankton regulation by zooplankton might be weaker in warm temperate systems than in temperate ones.

Registro:

Documento: Artículo
Título:Top-down and bottom-up regulation of planktonic communities in a warm temperate wetland
Autor:Sinistro, R.
Filiación:Laboratorio de Limnología, Departamento de Ecología, Facultad de Ciencias Exactas y Naturales, Buenos Aires C1428EHA, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Palabras clave:abundance; ciliate; flagellate; heterotrophy; lacustrine deposit; mesocosm; nutrient; omnivory; phytoplankton; planktivore; predation; teleost; wetland; zooplankton; South America; Ciliophora; Jenynsia
Año:2010
Volumen:32
Número:2
Página de inicio:209
Página de fin:220
DOI: http://dx.doi.org/10.1093/plankt/fbp114
Título revista:Journal of Plankton Research
Título revista abreviado:J. Plankton Res.
ISSN:01427873
CODEN:JPLRD
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_01427873_v32_n2_p209_Sinistro.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01427873_v32_n2_p209_Sinistro

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Citas:

---------- APA ----------
(2010) . Top-down and bottom-up regulation of planktonic communities in a warm temperate wetland. Journal of Plankton Research, 32(2), 209-220.
http://dx.doi.org/10.1093/plankt/fbp114
---------- CHICAGO ----------
Sinistro, R. "Top-down and bottom-up regulation of planktonic communities in a warm temperate wetland" . Journal of Plankton Research 32, no. 2 (2010) : 209-220.
http://dx.doi.org/10.1093/plankt/fbp114
---------- MLA ----------
Sinistro, R. "Top-down and bottom-up regulation of planktonic communities in a warm temperate wetland" . Journal of Plankton Research, vol. 32, no. 2, 2010, pp. 209-220.
http://dx.doi.org/10.1093/plankt/fbp114
---------- VANCOUVER ----------
Sinistro, R. Top-down and bottom-up regulation of planktonic communities in a warm temperate wetland. J. Plankton Res. 2010;32(2):209-220.
http://dx.doi.org/10.1093/plankt/fbp114