Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina

Autores
Ibarra Polesel, Mario Gabriel; Poi, Alicia Susana G.
Año de publicación
2016
Idioma
español castellano
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Feeding of Characidium rachovii (Characiformes: Crenuchidae) and Pyrrhulina australis (Characiformes: Lebiasinidae) in shallow lakes of Corrientes, Argentina. Fishes display diverse feeding strategies that may undergo modifications through ontogeny or seasonally with ecological implications in the food webs. Even though the significance of fishes as top predators is recognized, the diet of many of them is still scarcely known; especially in fish that inhabit shallow lakes densely vegetated. The aim of this study was to investigate the diet of Characidium rachovii and Pyrrhulina australis of different sizes classes (I, II and III); during winter and summer and estimate their trophic niche breadth. The field work was carried out in two shallow lakes fed by rain (Soto and Pampin lake, Corrientes province), from July 2011 to August 2012. The stomach contents of 104 individuals of C. rachovii and 91 specimens of P. australis were examined. Accumulation curve showed that the number of analyzed stomachs was representative for both species. Twenty three food items for C. rachovii and twenty eight for P. australis were recognized in the gut contents. According to the index of relative importance (IRI), both species feed preferably on cladocerans and midges (Chironomidae), and both species showed a large overlap in their diets (85%) according to Morisita index. However the diversity of food items and the trophic niche breadth of P. australis (1D=8.86; B=4.76) were higher than C. rachovii (1D=3.37; B=2.25). Significant differences were observed in the diet of three sizes of P. australis (χ2, p<0.01) and between the sizes I and III of C. rachovii (χ2, p=0.03). In both species the diversity of food items increased with increasing their size. Between seasons, the differences in diet were significant for both species (χ2, p <0.0001). The high feeding overlap indicates that both species mostly use the same resources. Notwithstanding this, both the number of food items as the diversity and breadth of the trophic niche, suggest that these species use different feeding strategies, C. rachovii showed a trend towards specialization in microcrustacean?s consumption; while P. australis exhibited a broader trophic spectrum, incorporating insects from littoral areas and from the terrestrial community. The loss of the trophic dominant resource by increases of urbanization on the margin of the studied shallow lakes could lead to increase competition due to the wide overlap in the diet of both species.
Fil: Ibarra Polesel, Mario Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura; Argentina
Fil: Poi, Alicia Susana G.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
Materia
peces
dieta
nicho trófico
lagunas periurbanas
noreste argentino
fish
diet
trophic niche
peri-urban lakes
Argentine Northeast
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:11336/101461

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network_name_str CONICET Digital (CONICET)
spelling Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, ArgentinaFeeding of Characidium rachovii (Characiformes: Crenuchidae) and Pyrrhulina australis (Characiformes: Lebiasinidae) in shallow lakes of Corrientes, ArgentinaIbarra Polesel, Mario GabrielPoi, Alicia Susana G.pecesdietanicho tróficolagunas periurbanasnoreste argentinofishdiettrophic nicheperi-urban lakesArgentine Northeasthttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Feeding of Characidium rachovii (Characiformes: Crenuchidae) and Pyrrhulina australis (Characiformes: Lebiasinidae) in shallow lakes of Corrientes, Argentina. Fishes display diverse feeding strategies that may undergo modifications through ontogeny or seasonally with ecological implications in the food webs. Even though the significance of fishes as top predators is recognized, the diet of many of them is still scarcely known; especially in fish that inhabit shallow lakes densely vegetated. The aim of this study was to investigate the diet of Characidium rachovii and Pyrrhulina australis of different sizes classes (I, II and III); during winter and summer and estimate their trophic niche breadth. The field work was carried out in two shallow lakes fed by rain (Soto and Pampin lake, Corrientes province), from July 2011 to August 2012. The stomach contents of 104 individuals of C. rachovii and 91 specimens of P. australis were examined. Accumulation curve showed that the number of analyzed stomachs was representative for both species. Twenty three food items for C. rachovii and twenty eight for P. australis were recognized in the gut contents. According to the index of relative importance (IRI), both species feed preferably on cladocerans and midges (Chironomidae), and both species showed a large overlap in their diets (85%) according to Morisita index. However the diversity of food items and the trophic niche breadth of P. australis (1D=8.86; B=4.76) were higher than C. rachovii (1D=3.37; B=2.25). Significant differences were observed in the diet of three sizes of P. australis (χ2, p<0.01) and between the sizes I and III of C. rachovii (χ2, p=0.03). In both species the diversity of food items increased with increasing their size. Between seasons, the differences in diet were significant for both species (χ2, p <0.0001). The high feeding overlap indicates that both species mostly use the same resources. Notwithstanding this, both the number of food items as the diversity and breadth of the trophic niche, suggest that these species use different feeding strategies, C. rachovii showed a trend towards specialization in microcrustacean?s consumption; while P. australis exhibited a broader trophic spectrum, incorporating insects from littoral areas and from the terrestrial community. The loss of the trophic dominant resource by increases of urbanization on the margin of the studied shallow lakes could lead to increase competition due to the wide overlap in the diet of both species.Fil: Ibarra Polesel, Mario Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura; ArgentinaFil: Poi, Alicia Susana G.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; ArgentinaUniversidad de Costa Rica2016-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/101461Ibarra Polesel, Mario Gabriel; Poi, Alicia Susana G.; Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina; Universidad de Costa Rica; Revista de Biología Tropical; 64; 2; 5-2016; 603-6150034-7744CONICET DigitalCONICETspainfo:eu-repo/semantics/altIdentifier/doi/10.15517/rbt.v64i2.19602info:eu-repo/semantics/altIdentifier/url/https://revistas.ucr.ac.cr/index.php/rbt/article/view/19602info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:41:07Zoai:ri.conicet.gov.ar:11336/101461instacron: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:34982025-09-29 10:41:07.271CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina
Feeding of Characidium rachovii (Characiformes: Crenuchidae) and Pyrrhulina australis (Characiformes: Lebiasinidae) in shallow lakes of Corrientes, Argentina
title Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina
spellingShingle Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina
Ibarra Polesel, Mario Gabriel
peces
dieta
nicho trófico
lagunas periurbanas
noreste argentino
fish
diet
trophic niche
peri-urban lakes
Argentine Northeast
title_short Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina
title_full Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina
title_fullStr Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina
title_full_unstemmed Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina
title_sort Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina
dc.creator.none.fl_str_mv Ibarra Polesel, Mario Gabriel
Poi, Alicia Susana G.
author Ibarra Polesel, Mario Gabriel
author_facet Ibarra Polesel, Mario Gabriel
Poi, Alicia Susana G.
author_role author
author2 Poi, Alicia Susana G.
author2_role author
dc.subject.none.fl_str_mv peces
dieta
nicho trófico
lagunas periurbanas
noreste argentino
fish
diet
trophic niche
peri-urban lakes
Argentine Northeast
topic peces
dieta
nicho trófico
lagunas periurbanas
noreste argentino
fish
diet
trophic niche
peri-urban lakes
Argentine Northeast
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Feeding of Characidium rachovii (Characiformes: Crenuchidae) and Pyrrhulina australis (Characiformes: Lebiasinidae) in shallow lakes of Corrientes, Argentina. Fishes display diverse feeding strategies that may undergo modifications through ontogeny or seasonally with ecological implications in the food webs. Even though the significance of fishes as top predators is recognized, the diet of many of them is still scarcely known; especially in fish that inhabit shallow lakes densely vegetated. The aim of this study was to investigate the diet of Characidium rachovii and Pyrrhulina australis of different sizes classes (I, II and III); during winter and summer and estimate their trophic niche breadth. The field work was carried out in two shallow lakes fed by rain (Soto and Pampin lake, Corrientes province), from July 2011 to August 2012. The stomach contents of 104 individuals of C. rachovii and 91 specimens of P. australis were examined. Accumulation curve showed that the number of analyzed stomachs was representative for both species. Twenty three food items for C. rachovii and twenty eight for P. australis were recognized in the gut contents. According to the index of relative importance (IRI), both species feed preferably on cladocerans and midges (Chironomidae), and both species showed a large overlap in their diets (85%) according to Morisita index. However the diversity of food items and the trophic niche breadth of P. australis (1D=8.86; B=4.76) were higher than C. rachovii (1D=3.37; B=2.25). Significant differences were observed in the diet of three sizes of P. australis (χ2, p<0.01) and between the sizes I and III of C. rachovii (χ2, p=0.03). In both species the diversity of food items increased with increasing their size. Between seasons, the differences in diet were significant for both species (χ2, p <0.0001). The high feeding overlap indicates that both species mostly use the same resources. Notwithstanding this, both the number of food items as the diversity and breadth of the trophic niche, suggest that these species use different feeding strategies, C. rachovii showed a trend towards specialization in microcrustacean?s consumption; while P. australis exhibited a broader trophic spectrum, incorporating insects from littoral areas and from the terrestrial community. The loss of the trophic dominant resource by increases of urbanization on the margin of the studied shallow lakes could lead to increase competition due to the wide overlap in the diet of both species.
Fil: Ibarra Polesel, Mario Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura; Argentina
Fil: Poi, Alicia Susana G.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina
description Feeding of Characidium rachovii (Characiformes: Crenuchidae) and Pyrrhulina australis (Characiformes: Lebiasinidae) in shallow lakes of Corrientes, Argentina. Fishes display diverse feeding strategies that may undergo modifications through ontogeny or seasonally with ecological implications in the food webs. Even though the significance of fishes as top predators is recognized, the diet of many of them is still scarcely known; especially in fish that inhabit shallow lakes densely vegetated. The aim of this study was to investigate the diet of Characidium rachovii and Pyrrhulina australis of different sizes classes (I, II and III); during winter and summer and estimate their trophic niche breadth. The field work was carried out in two shallow lakes fed by rain (Soto and Pampin lake, Corrientes province), from July 2011 to August 2012. The stomach contents of 104 individuals of C. rachovii and 91 specimens of P. australis were examined. Accumulation curve showed that the number of analyzed stomachs was representative for both species. Twenty three food items for C. rachovii and twenty eight for P. australis were recognized in the gut contents. According to the index of relative importance (IRI), both species feed preferably on cladocerans and midges (Chironomidae), and both species showed a large overlap in their diets (85%) according to Morisita index. However the diversity of food items and the trophic niche breadth of P. australis (1D=8.86; B=4.76) were higher than C. rachovii (1D=3.37; B=2.25). Significant differences were observed in the diet of three sizes of P. australis (χ2, p<0.01) and between the sizes I and III of C. rachovii (χ2, p=0.03). In both species the diversity of food items increased with increasing their size. Between seasons, the differences in diet were significant for both species (χ2, p <0.0001). The high feeding overlap indicates that both species mostly use the same resources. Notwithstanding this, both the number of food items as the diversity and breadth of the trophic niche, suggest that these species use different feeding strategies, C. rachovii showed a trend towards specialization in microcrustacean?s consumption; while P. australis exhibited a broader trophic spectrum, incorporating insects from littoral areas and from the terrestrial community. The loss of the trophic dominant resource by increases of urbanization on the margin of the studied shallow lakes could lead to increase competition due to the wide overlap in the diet of both species.
publishDate 2016
dc.date.none.fl_str_mv 2016-05
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/11336/101461
Ibarra Polesel, Mario Gabriel; Poi, Alicia Susana G.; Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina; Universidad de Costa Rica; Revista de Biología Tropical; 64; 2; 5-2016; 603-615
0034-7744
CONICET Digital
CONICET
url http://hdl.handle.net/11336/101461
identifier_str_mv Ibarra Polesel, Mario Gabriel; Poi, Alicia Susana G.; Alimentación de Characidium rachovii (Characiformes: Crenuchidae) y Pyrrhulina australis (Characiformes: Lebiasinidae) en lagunas someras de la provincia de Corrientes, Argentina; Universidad de Costa Rica; Revista de Biología Tropical; 64; 2; 5-2016; 603-615
0034-7744
CONICET Digital
CONICET
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language spa
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dc.publisher.none.fl_str_mv Universidad de Costa Rica
publisher.none.fl_str_mv Universidad de Costa Rica
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