Why predation is not a controlling factor of phytoplankton in a Neotropical shallow lake: a morpho-functional perspective

This work explores the reasons why predation plays a minor role in structuring phytoplankton composition in a Neotropical shallow lake. Phytoplankton, zooplankton, and fish were sampled from a shallow lake over the course of a year, and the stomach contents of 80 individuals of the dominant omnivoro...

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Autores principales: Frau, D., Battauz, Y., Sinistro, R.
Formato: JOUR
Materias:
Omnivorous fish effects
Phytoplankton features
Top-down control
Zooplankton size
alga
crustacean
cyanobacterium
fish
flagellate
lacustrine environment
Neotropical Region
phytoplankton
planktivore
predation
stomach content
top-down control
zooplankton
algae
Cladocera
Cyanobacteria
Mastigophora (flagellates)
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00188158_v788_n1_p115_Frau
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00188158_v788_n1_p115_Frau
record_format dspace
spelling todo:paper_00188158_v788_n1_p115_Frau2023-10-03T14:16:12Z Why predation is not a controlling factor of phytoplankton in a Neotropical shallow lake: a morpho-functional perspective Frau, D. Battauz, Y. Sinistro, R. Omnivorous fish effects Phytoplankton features Top-down control Zooplankton size alga crustacean cyanobacterium fish flagellate lacustrine environment Neotropical Region phytoplankton planktivore predation stomach content top-down control zooplankton algae Cladocera Cyanobacteria Mastigophora (flagellates) This work explores the reasons why predation plays a minor role in structuring phytoplankton composition in a Neotropical shallow lake. Phytoplankton, zooplankton, and fish were sampled from a shallow lake over the course of a year, and the stomach contents of 80 individuals of the dominant omnivorous–planktivorous fish species were analyzed. The field study was complemented with a 5-day microcosm experiment in which the predation effects of micro, meso, and macrozooplankton were measured. Stomach content analysis revealed that fish predation was high, and primarily comprised by Cladocera (Ivlev’s index >0.75). Both meso and macrozooplankton fractions are able to feed on colonial cyanobacteria, silica cell-wall organisms (<35 µm), and mixotrophic flagellate (>35 µm). Macrozooplankton, however, can feed on single cells, mucilaginous colonies, non-mucilaginous colonies, and silica cell-wall organisms (>35 µm) (P < 0.05 in all cases). Our results support the idea that absence of predation on phytoplankton is mainly mediated by fish predation on zooplankton and morpho-functional characteristics of algae which prevent zooplankton predation; showing fish a lack of direct predation effect on phytoplankton. © 2016, Springer International Publishing Switzerland. Fil:Sinistro, R. 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_00188158_v788_n1_p115_Frau
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Omnivorous fish effects
Phytoplankton features
Top-down control
Zooplankton size
alga
crustacean
cyanobacterium
fish
flagellate
lacustrine environment
Neotropical Region
phytoplankton
planktivore
predation
stomach content
top-down control
zooplankton
algae
Cladocera
Cyanobacteria
Mastigophora (flagellates)
spellingShingle Omnivorous fish effects
Phytoplankton features
Top-down control
Zooplankton size
alga
crustacean
cyanobacterium
fish
flagellate
lacustrine environment
Neotropical Region
phytoplankton
planktivore
predation
stomach content
top-down control
zooplankton
algae
Cladocera
Cyanobacteria
Mastigophora (flagellates)
Frau, D.
Battauz, Y.
Sinistro, R.
Why predation is not a controlling factor of phytoplankton in a Neotropical shallow lake: a morpho-functional perspective
topic_facet Omnivorous fish effects
Phytoplankton features
Top-down control
Zooplankton size
alga
crustacean
cyanobacterium
fish
flagellate
lacustrine environment
Neotropical Region
phytoplankton
planktivore
predation
stomach content
top-down control
zooplankton
algae
Cladocera
Cyanobacteria
Mastigophora (flagellates)
description This work explores the reasons why predation plays a minor role in structuring phytoplankton composition in a Neotropical shallow lake. Phytoplankton, zooplankton, and fish were sampled from a shallow lake over the course of a year, and the stomach contents of 80 individuals of the dominant omnivorous–planktivorous fish species were analyzed. The field study was complemented with a 5-day microcosm experiment in which the predation effects of micro, meso, and macrozooplankton were measured. Stomach content analysis revealed that fish predation was high, and primarily comprised by Cladocera (Ivlev’s index >0.75). Both meso and macrozooplankton fractions are able to feed on colonial cyanobacteria, silica cell-wall organisms (<35 µm), and mixotrophic flagellate (>35 µm). Macrozooplankton, however, can feed on single cells, mucilaginous colonies, non-mucilaginous colonies, and silica cell-wall organisms (>35 µm) (P < 0.05 in all cases). Our results support the idea that absence of predation on phytoplankton is mainly mediated by fish predation on zooplankton and morpho-functional characteristics of algae which prevent zooplankton predation; showing fish a lack of direct predation effect on phytoplankton. © 2016, Springer International Publishing Switzerland.
format JOUR
author Frau, D.
Battauz, Y.
Sinistro, R.
author_facet Frau, D.
Battauz, Y.
Sinistro, R.
author_sort Frau, D.
title Why predation is not a controlling factor of phytoplankton in a Neotropical shallow lake: a morpho-functional perspective
title_short Why predation is not a controlling factor of phytoplankton in a Neotropical shallow lake: a morpho-functional perspective
title_full Why predation is not a controlling factor of phytoplankton in a Neotropical shallow lake: a morpho-functional perspective
title_fullStr Why predation is not a controlling factor of phytoplankton in a Neotropical shallow lake: a morpho-functional perspective
title_full_unstemmed Why predation is not a controlling factor of phytoplankton in a Neotropical shallow lake: a morpho-functional perspective
title_sort why predation is not a controlling factor of phytoplankton in a neotropical shallow lake: a morpho-functional perspective
url http://hdl.handle.net/20.500.12110/paper_00188158_v788_n1_p115_Frau
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AT sinistror whypredationisnotacontrollingfactorofphytoplanktoninaneotropicalshallowlakeamorphofunctionalperspective
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