Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system

Autores
Saigo, Miguel; Zilli, Florencia Lucila; Marchese Garello, Mercedes Rosa; Demonte, Lucio Danilo
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
To determine the mean trophic level and food chain length and to quantify omnivory in a floodplain lake of the Middle Paraná River, we constructed a food web model based on available data. Because proper selection of basal resources is essential, we performed stepwise model selection to decide which sources to include in the model. We estimated mean trophic level, food chain length and omnivory using a binary web (non-weighted trophic links) and a weighted web (trophic links weighted using stable isotopes). Model selection excluded macrophytes as relevant resources for the food web of this floodplain lake. In general, trophic links were relatively even, leading to similar estimations of mean trophic level and omnivory in both binary and weighted webs. Food chain length, however, was higher for the binary web, which was caused by the strong link of top predators with lower-trophic level prey in this ecosystem. Overall, the estimate of food chain length in the Paraná River was not particularly high,despite the high productivity and size of this ecosystem. We suggest that the periodical hydrological fluctuation of large rivers could be a major factor precluding the occurrence of long food chains.
Fil: Saigo, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina
Fil: Zilli, Florencia Lucila. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina
Fil: Marchese Garello, Mercedes Rosa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina
Fil: Demonte, Lucio Danilo. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; Argentina
Materia
stable isotopes
fishes
macroinvertebrates
flooplains
IsoWebs
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/90445
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river systemSaigo, MiguelZilli, Florencia LucilaMarchese Garello, Mercedes RosaDemonte, Lucio Danilostable isotopesfishesmacroinvertebratesflooplainsIsoWebshttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1To determine the mean trophic level and food chain length and to quantify omnivory in a floodplain lake of the Middle Paraná River, we constructed a food web model based on available data. Because proper selection of basal resources is essential, we performed stepwise model selection to decide which sources to include in the model. We estimated mean trophic level, food chain length and omnivory using a binary web (non-weighted trophic links) and a weighted web (trophic links weighted using stable isotopes). Model selection excluded macrophytes as relevant resources for the food web of this floodplain lake. In general, trophic links were relatively even, leading to similar estimations of mean trophic level and omnivory in both binary and weighted webs. Food chain length, however, was higher for the binary web, which was caused by the strong link of top predators with lower-trophic level prey in this ecosystem. Overall, the estimate of food chain length in the Paraná River was not particularly high,despite the high productivity and size of this ecosystem. We suggest that the periodical hydrological fluctuation of large rivers could be a major factor precluding the occurrence of long food chains.Fil: Saigo, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Zilli, Florencia Lucila. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Marchese Garello, Mercedes Rosa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Demonte, Lucio Danilo. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; ArgentinaSpringer Tokyo2015-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/90445Saigo, Miguel; Zilli, Florencia Lucila; Marchese Garello, Mercedes Rosa; Demonte, Lucio Danilo; Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system; Springer Tokyo; Ecological Research; 30; 5; 9-2015; 843-8520912-3814CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1007/s11284-015-1283-1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:16:11Zoai:ri.conicet.gov.ar:11336/90445instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:16:11.767CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system
title Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system
spellingShingle Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system
Saigo, Miguel
stable isotopes
fishes
macroinvertebrates
flooplains
IsoWebs
title_short Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system
title_full Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system
title_fullStr Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system
title_full_unstemmed Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system
title_sort Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system
dc.creator.none.fl_str_mv Saigo, Miguel
Zilli, Florencia Lucila
Marchese Garello, Mercedes Rosa
Demonte, Lucio Danilo
author Saigo, Miguel
author_facet Saigo, Miguel
Zilli, Florencia Lucila
Marchese Garello, Mercedes Rosa
Demonte, Lucio Danilo
author_role author
author2 Zilli, Florencia Lucila
Marchese Garello, Mercedes Rosa
Demonte, Lucio Danilo
author2_role author
author
author
dc.subject.none.fl_str_mv stable isotopes
fishes
macroinvertebrates
flooplains
IsoWebs
topic stable isotopes
fishes
macroinvertebrates
flooplains
IsoWebs
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv To determine the mean trophic level and food chain length and to quantify omnivory in a floodplain lake of the Middle Paraná River, we constructed a food web model based on available data. Because proper selection of basal resources is essential, we performed stepwise model selection to decide which sources to include in the model. We estimated mean trophic level, food chain length and omnivory using a binary web (non-weighted trophic links) and a weighted web (trophic links weighted using stable isotopes). Model selection excluded macrophytes as relevant resources for the food web of this floodplain lake. In general, trophic links were relatively even, leading to similar estimations of mean trophic level and omnivory in both binary and weighted webs. Food chain length, however, was higher for the binary web, which was caused by the strong link of top predators with lower-trophic level prey in this ecosystem. Overall, the estimate of food chain length in the Paraná River was not particularly high,despite the high productivity and size of this ecosystem. We suggest that the periodical hydrological fluctuation of large rivers could be a major factor precluding the occurrence of long food chains.
Fil: Saigo, Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina
Fil: Zilli, Florencia Lucila. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina
Fil: Marchese Garello, Mercedes Rosa. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina
Fil: Demonte, Lucio Danilo. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; Argentina
description To determine the mean trophic level and food chain length and to quantify omnivory in a floodplain lake of the Middle Paraná River, we constructed a food web model based on available data. Because proper selection of basal resources is essential, we performed stepwise model selection to decide which sources to include in the model. We estimated mean trophic level, food chain length and omnivory using a binary web (non-weighted trophic links) and a weighted web (trophic links weighted using stable isotopes). Model selection excluded macrophytes as relevant resources for the food web of this floodplain lake. In general, trophic links were relatively even, leading to similar estimations of mean trophic level and omnivory in both binary and weighted webs. Food chain length, however, was higher for the binary web, which was caused by the strong link of top predators with lower-trophic level prey in this ecosystem. Overall, the estimate of food chain length in the Paraná River was not particularly high,despite the high productivity and size of this ecosystem. We suggest that the periodical hydrological fluctuation of large rivers could be a major factor precluding the occurrence of long food chains.
publishDate 2015
dc.date.none.fl_str_mv 2015-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/90445
Saigo, Miguel; Zilli, Florencia Lucila; Marchese Garello, Mercedes Rosa; Demonte, Lucio Danilo; Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system; Springer Tokyo; Ecological Research; 30; 5; 9-2015; 843-852
0912-3814
CONICET Digital
CONICET
url http://hdl.handle.net/11336/90445
identifier_str_mv Saigo, Miguel; Zilli, Florencia Lucila; Marchese Garello, Mercedes Rosa; Demonte, Lucio Danilo; Trophic level, food chain length and omnivory in the Paraná River: a food web model approach in a floodplain river system; Springer Tokyo; Ecological Research; 30; 5; 9-2015; 843-852
0912-3814
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1007/s11284-015-1283-1
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Springer Tokyo
publisher.none.fl_str_mv Springer Tokyo
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.993085

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