Influence of lake trophic conditions on the dominant mixotrophic algal assemblages

Mixotrophic protists combine photo-Autotrophy and phago-heterotrophy. Even though only in oligotrophic systems mixotrophs overcome strictly autotrophs, they are represented all along the trophic spectrum. We hypothesize that lakes with different chlorophyll a (Chla) and dissolved organic carbon (DOC...

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Autores principales: Saad, J.F., Unrein, F., Tribelli, P.M., López, N., Izaguirre, I.
Formato: JOUR
Materias:
DOC
Lakes
Mixotrophs
Phytoplankton
Trophic status
bacterivory
chlorophyll a
community composition
dissolved organic carbon
flagellate
lacustrine environment
mixotrophy
oligotrophic environment
phytoplankton
trophic conditions
trophic status
Patagonia
algae
Chrysophyceae
Cryptophyta
Mastigophora (flagellates)
Phago
Protista
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01427873_v38_n4_p1_Saad
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01427873_v38_n4_p1_Saad
record_format dspace
spelling todo:paper_01427873_v38_n4_p1_Saad2023-10-03T14:59:05Z Influence of lake trophic conditions on the dominant mixotrophic algal assemblages Saad, J.F. Unrein, F. Tribelli, P.M. López, N. Izaguirre, I. DOC Lakes Mixotrophs Phytoplankton Trophic status bacterivory chlorophyll a community composition dissolved organic carbon flagellate lacustrine environment mixotrophy oligotrophic environment phytoplankton trophic conditions trophic status Patagonia algae Chrysophyceae Cryptophyta Mastigophora (flagellates) Phago Protista Mixotrophic protists combine photo-Autotrophy and phago-heterotrophy. Even though only in oligotrophic systems mixotrophs overcome strictly autotrophs, they are represented all along the trophic spectrum. We hypothesize that lakes with different chlorophyll a (Chla) and dissolved organic carbon (DOC) concentrations harbor different assemblages of mixotrophs. We examined the composition of mixotrophs in 24 lakes in two Patagonian regions (Argentina), with a range of conditions of Chla and DOC. The categorization of a predominant type of nutrition in each mixotroph was based on published evidence. Additionally in four lakes we analyzed the bacterivory activity of mixotrophs by performing ingestion experiments. We found potentially mixotrophic taxa in all lakes, however the assemblages varied depending on their trophic-DOC features. Primarily heterotrophic mixotrophs (e.g. chrysophytes) attained a higher proportion in oligotrophic lakes, declining towards higher trophic status. In contrast, primarily autotrophic mixotrophs (e.g. cryptophytes) dominated in eutrophic systems. Mixotrophs actively ingested bacteria in all experiments, however cell-specific grazing rates were higher in oligotrophic lakes. Mixotrophs accounted for more than half of total flagellate grazing in oligo-mesotrophic environments. Our results suggest that there is a replacement of mixotrophic taxa along a gradient of increasing trophic state, from primarily heterotrophic to primarily autotrophic mixotrophs, whereas their relative contribution to total flagellate grazing decreases. © 2016 the author. Fil:Saad, J.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Unrein, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tribelli, P.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Izaguirre, I. 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_01427873_v38_n4_p1_Saad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic DOC
Lakes
Mixotrophs
Phytoplankton
Trophic status
bacterivory
chlorophyll a
community composition
dissolved organic carbon
flagellate
lacustrine environment
mixotrophy
oligotrophic environment
phytoplankton
trophic conditions
trophic status
Patagonia
algae
Chrysophyceae
Cryptophyta
Mastigophora (flagellates)
Phago
Protista
spellingShingle DOC
Lakes
Mixotrophs
Phytoplankton
Trophic status
bacterivory
chlorophyll a
community composition
dissolved organic carbon
flagellate
lacustrine environment
mixotrophy
oligotrophic environment
phytoplankton
trophic conditions
trophic status
Patagonia
algae
Chrysophyceae
Cryptophyta
Mastigophora (flagellates)
Phago
Protista
Saad, J.F.
Unrein, F.
Tribelli, P.M.
López, N.
Izaguirre, I.
Influence of lake trophic conditions on the dominant mixotrophic algal assemblages
topic_facet DOC
Lakes
Mixotrophs
Phytoplankton
Trophic status
bacterivory
chlorophyll a
community composition
dissolved organic carbon
flagellate
lacustrine environment
mixotrophy
oligotrophic environment
phytoplankton
trophic conditions
trophic status
Patagonia
algae
Chrysophyceae
Cryptophyta
Mastigophora (flagellates)
Phago
Protista
description Mixotrophic protists combine photo-Autotrophy and phago-heterotrophy. Even though only in oligotrophic systems mixotrophs overcome strictly autotrophs, they are represented all along the trophic spectrum. We hypothesize that lakes with different chlorophyll a (Chla) and dissolved organic carbon (DOC) concentrations harbor different assemblages of mixotrophs. We examined the composition of mixotrophs in 24 lakes in two Patagonian regions (Argentina), with a range of conditions of Chla and DOC. The categorization of a predominant type of nutrition in each mixotroph was based on published evidence. Additionally in four lakes we analyzed the bacterivory activity of mixotrophs by performing ingestion experiments. We found potentially mixotrophic taxa in all lakes, however the assemblages varied depending on their trophic-DOC features. Primarily heterotrophic mixotrophs (e.g. chrysophytes) attained a higher proportion in oligotrophic lakes, declining towards higher trophic status. In contrast, primarily autotrophic mixotrophs (e.g. cryptophytes) dominated in eutrophic systems. Mixotrophs actively ingested bacteria in all experiments, however cell-specific grazing rates were higher in oligotrophic lakes. Mixotrophs accounted for more than half of total flagellate grazing in oligo-mesotrophic environments. Our results suggest that there is a replacement of mixotrophic taxa along a gradient of increasing trophic state, from primarily heterotrophic to primarily autotrophic mixotrophs, whereas their relative contribution to total flagellate grazing decreases. © 2016 the author.
format JOUR
author Saad, J.F.
Unrein, F.
Tribelli, P.M.
López, N.
Izaguirre, I.
author_facet Saad, J.F.
Unrein, F.
Tribelli, P.M.
López, N.
Izaguirre, I.
author_sort Saad, J.F.
title Influence of lake trophic conditions on the dominant mixotrophic algal assemblages
title_short Influence of lake trophic conditions on the dominant mixotrophic algal assemblages
title_full Influence of lake trophic conditions on the dominant mixotrophic algal assemblages
title_fullStr Influence of lake trophic conditions on the dominant mixotrophic algal assemblages
title_full_unstemmed Influence of lake trophic conditions on the dominant mixotrophic algal assemblages
title_sort influence of lake trophic conditions on the dominant mixotrophic algal assemblages
url http://hdl.handle.net/20.500.12110/paper_01427873_v38_n4_p1_Saad
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AT tribellipm influenceoflaketrophicconditionsonthedominantmixotrophicalgalassemblages
AT lopezn influenceoflaketrophicconditionsonthedominantmixotrophicalgalassemblages
AT izaguirrei influenceoflaketrophicconditionsonthedominantmixotrophicalgalassemblages
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