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

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, I., De Tezanos Pinto, P., Rodríguez, P.L., Chaparro, G., Pizarro, H.N.
Formato:	JOUR
Materias:	Disturbance Free-floating plants Light regime Phytoplankton Shallow lake
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00465070_v54_n2_p363_OFarrell
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00465070_v54_n2_p363_OFarrell
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spelling	todo:paper_00465070_v54_n2_p363_OFarrell2023-10-03T14:52:15Z Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology O'Farrell, I. De Tezanos Pinto, P. Rodríguez, P.L. Chaparro, G. Pizarro, H.N. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, I. De Tezanos Pinto, P. Rodríguez, P.L. Chaparro, G. Pizarro, H.N. 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.
format	JOUR
author	O'Farrell, I. De Tezanos Pinto, P. Rodríguez, P.L. Chaparro, G. Pizarro, H.N.
author_facet	O'Farrell, I. De Tezanos Pinto, P. Rodríguez, P.L. Chaparro, G. Pizarro, H.N.
author_sort	O'Farrell, I.
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
url	http://hdl.handle.net/20.500.12110/paper_00465070_v54_n2_p363_OFarrell
work_keys_str_mv	AT ofarrelli experimentalevidenceofthedynamiceffectoffreefloatingplantsonphytoplanktonecology AT detezanospintop experimentalevidenceofthedynamiceffectoffreefloatingplantsonphytoplanktonecology AT rodriguezpl experimentalevidenceofthedynamiceffectoffreefloatingplantsonphytoplanktonecology AT chaparrog experimentalevidenceofthedynamiceffectoffreefloatingplantsonphytoplanktonecology AT pizarrohn experimentalevidenceofthedynamiceffectoffreefloatingplantsonphytoplanktonecology
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Experimental evidence of the dynamic effect of free-floating plants on phytoplankton ecology

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