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Abstract:

In order to address the top-down effect on the different phytoplankton size-fractions and ciliates, a survey at microcosm scale was conducted in a hypertrophic Antarctic pond, testing the hypotheses that (1) the picophytoplankton is regulated by a top-down control exerted by organisms of the bigger size-fractions, and (2) the nanoplankton fraction (algae and ciliates) is not regulated by a top-down control exerted by the microplankton. The treatments enclosed pond water that was filtered to obtain the different plankton sizes: (a) through 55 μm, (b) 20 μm, and (c) 3 μm pore size filters. The variation in the net growth rate (k′) of the phytoplankton size-fractions and ciliates was analysed after 4 days. The results determined a significant difference (P<0.011) in the k′ value of the picophytoplankton when nano and micro-sized fractions where removed. Conversely, nanophytoplankton and nanociliates were not affected by the removal of bigger size-fractions. We suggest that in this pond the top-down control of the picophytoplankton is relevant, and that the grazing impact is not a key factor in the regulation of the nano-sized (algae and ciliates) plankton components. © Springer-Verlag 2006.

Registro:

Documento: Artículo
Título:Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs
Autor:Allende, L.; Pizarro, H.
Filiación:Departamento de Ecología, Genética Y Evolución, Facultad de Ciencias Exactas Y Naturales, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
CONICET (Consejo Nacional de Investigaciones Científicas Y Técnicas), Buenos Aires, Argentina
Palabras clave:Antarctica; Ciliates; Phytoplankton; Picoplankton; Top-down; experimental study; food web; growth rate; microplankton; nanoplankton; picoplankton; top-down control; Antarctica; algae; Ciliophora
Año:2006
Volumen:29
Número:10
Página de inicio:893
Página de fin:901
DOI: http://dx.doi.org/10.1007/s00300-006-0129-2
Título revista:Polar Biology
Título revista abreviado:Polar Biol.
ISSN:07224060
CODEN:POBID
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v29_n10_p893_Allende

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Citas:

---------- APA ----------
Allende, L. & Pizarro, H. (2006) . Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs. Polar Biology, 29(10), 893-901.
http://dx.doi.org/10.1007/s00300-006-0129-2
---------- CHICAGO ----------
Allende, L., Pizarro, H. "Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs" . Polar Biology 29, no. 10 (2006) : 893-901.
http://dx.doi.org/10.1007/s00300-006-0129-2
---------- MLA ----------
Allende, L., Pizarro, H. "Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs" . Polar Biology, vol. 29, no. 10, 2006, pp. 893-901.
http://dx.doi.org/10.1007/s00300-006-0129-2
---------- VANCOUVER ----------
Allende, L., Pizarro, H. Top-down control on plankton components in an Antarctic pond: Experimental approach to the study of low-complexity food webs. Polar Biol. 2006;29(10):893-901.
http://dx.doi.org/10.1007/s00300-006-0129-2