Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology

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1. There is an increasing concern to understand the role of free-floating plants (FFP) on the functioning and structure of shallow lakes, particularly the mechanisms by which their dominance is self-stabilizing and how they may outcompete phytoplankton. 2. In a field experiment with mesocosms, we si...

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Autores principales: O'Farrell, Inés, De Tezanos Pinto, Paula, Rodríguez, Patricia Laura, Chaparro, Griselda Noemi, Pizarro, Haydee Norma
Publicado: 2009
Materias:
Disturbance
Free-floating plants
Light regime
Phytoplankton
Shallow lake
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00465070_v54_n2_p363_OFarrell
http://hdl.handle.net/20.500.12110/paper_00465070_v54_n2_p363_OFarrell
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00465070_v54_n2_p363_OFarrell
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spelling paper:paper_00465070_v54_n2_p363_OFarrell2023-06-08T15:05:29Z Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology O'Farrell, Inés De Tezanos Pinto, Paula Rodríguez, Patricia Laura Chaparro, Griselda Noemi Pizarro, Haydee Norma Disturbance Free-floating plants Light regime Phytoplankton Shallow lake 1. There is an increasing concern to understand the role of free-floating plants (FFP) on the functioning and structure of shallow lakes, particularly the mechanisms by which their dominance is self-stabilizing and how they may outcompete phytoplankton. 2. In a field experiment with mesocosms, we simulated three commonly encountered scenarios in warm temperate shallow lakes: FFP dominance, FFP fluctuation and FFP absence. We explored the effects of several key processes, triggered by FFP dynamics, on the composition, diversity and production of phytoplankton, and on the physicochemical conditions. 3. The effects of persistent floating mats on light interception triggered a complex response by the phytoplankton: species were lost and biomass was low, yet high diversity and productivity potential were maintained. A contrasting phytoplankton response characterized mesocosms lacking FFP, where light was sufficient but nitrogen was limiting. Fluctuating FFP cover brought periodic shifts between these two limiting resources for the phytoplankton, which most probably explain the maintenance of richness, diversity and production in these shallow lakes. 4. These results support the recently proposed framework of alternative stable states, providing experimental field evidence of the mechanisms resulting from the shifts between floating plants and phytoplankton dominance. © 2008 The Authors. Fil:O'Farrell, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:De Tezanos Pinto, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rodríguez, P.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Chaparro, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pizarro, H.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00465070_v54_n2_p363_OFarrell http://hdl.handle.net/20.500.12110/paper_00465070_v54_n2_p363_OFarrell
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Disturbance
Free-floating plants
Light regime
Phytoplankton
Shallow lake
spellingShingle Disturbance
Free-floating plants
Light regime
Phytoplankton
Shallow lake
O'Farrell, Inés
De Tezanos Pinto, Paula
Rodríguez, Patricia Laura
Chaparro, Griselda Noemi
Pizarro, Haydee Norma
Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology
topic_facet Disturbance
Free-floating plants
Light regime
Phytoplankton
Shallow lake
description 1. There is an increasing concern to understand the role of free-floating plants (FFP) on the functioning and structure of shallow lakes, particularly the mechanisms by which their dominance is self-stabilizing and how they may outcompete phytoplankton. 2. In a field experiment with mesocosms, we simulated three commonly encountered scenarios in warm temperate shallow lakes: FFP dominance, FFP fluctuation and FFP absence. We explored the effects of several key processes, triggered by FFP dynamics, on the composition, diversity and production of phytoplankton, and on the physicochemical conditions. 3. The effects of persistent floating mats on light interception triggered a complex response by the phytoplankton: species were lost and biomass was low, yet high diversity and productivity potential were maintained. A contrasting phytoplankton response characterized mesocosms lacking FFP, where light was sufficient but nitrogen was limiting. Fluctuating FFP cover brought periodic shifts between these two limiting resources for the phytoplankton, which most probably explain the maintenance of richness, diversity and production in these shallow lakes. 4. These results support the recently proposed framework of alternative stable states, providing experimental field evidence of the mechanisms resulting from the shifts between floating plants and phytoplankton dominance. © 2008 The Authors.
author O'Farrell, Inés
De Tezanos Pinto, Paula
Rodríguez, Patricia Laura
Chaparro, Griselda Noemi
Pizarro, Haydee Norma
author_facet O'Farrell, Inés
De Tezanos Pinto, Paula
Rodríguez, Patricia Laura
Chaparro, Griselda Noemi
Pizarro, Haydee Norma
author_sort O'Farrell, Inés
title Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology
title_short Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology
title_full Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology
title_fullStr Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology
title_full_unstemmed Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology
title_sort experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00465070_v54_n2_p363_OFarrell
http://hdl.handle.net/20.500.12110/paper_00465070_v54_n2_p363_OFarrell
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