Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, Brazil

Detalhes bibliográficos
Autor(a) principal: Zardo, Éverton Luís
Data de Publicação: 2013
Outros Autores: Behr, Everton Rodolfo
Tipo de documento: Artigo
Idioma: por
Título da fonte: Revista Brasileira Multidisciplinar
Texto Completo: http://revistarebram.com/index.php/revistauniara/article/view/63
Resumo: This paper aims at contributing to biological and ecological knowledge about Hoplosternum littorale by studying its diet in the Vacacaí River, RS. With this aim, samples were taken in all seasons in four points selected along the Vacacaí River, using gill nets with meshes 1.5, 2.0, 2.5, 3.0, 4.0; 5.0, 6.0 and 8.0 cm between adjacent knots. The nets remained in the water for 24 hours, being revised every six hours. The fish which was caught was fixed in 10% formalin and later preserved in 70% alcohol. The specimens were weighed, measured and had the digestive tract removed for diet analysis. The items found in stomach contents were separated into six categories: Insects, Mollusks, Detritus/Silt, Vegetables, Scales and Nematodes, each category being analyzed by frequency of occurrence and volumetric method, being combined to obtain the Feeding Index" (IAi). The stomach repletion index (SRI) and Repletion Index (RI) were also estimated to assess the feeding activity according to the circadian rhythm. The most important items in the diet of this species according to IAi were insects, sediment and plant. H. littorale showed greater feeding activity in early morning, coinciding with greater capture also in reviewing this time, suggesting a nocturnal activity.
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spelling Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, BrazilDieta e Ritmo Circadiano da Atividade Alimentar do Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Capturados no Rio Vacacaí, Rio Grande do Sul, BrasilFeedingTrophic spectrumHoplosternum littorale.AlimentaçãoEspectro tróficoHoplosternum littorale.This paper aims at contributing to biological and ecological knowledge about Hoplosternum littorale by studying its diet in the Vacacaí River, RS. With this aim, samples were taken in all seasons in four points selected along the Vacacaí River, using gill nets with meshes 1.5, 2.0, 2.5, 3.0, 4.0; 5.0, 6.0 and 8.0 cm between adjacent knots. The nets remained in the water for 24 hours, being revised every six hours. The fish which was caught was fixed in 10% formalin and later preserved in 70% alcohol. The specimens were weighed, measured and had the digestive tract removed for diet analysis. The items found in stomach contents were separated into six categories: Insects, Mollusks, Detritus/Silt, Vegetables, Scales and Nematodes, each category being analyzed by frequency of occurrence and volumetric method, being combined to obtain the Feeding Index" (IAi). The stomach repletion index (SRI) and Repletion Index (RI) were also estimated to assess the feeding activity according to the circadian rhythm. The most important items in the diet of this species according to IAi were insects, sediment and plant. H. littorale showed greater feeding activity in early morning, coinciding with greater capture also in reviewing this time, suggesting a nocturnal activity.O presente trabalho tem como objetivo contribuir com os conhecimentos biológicos e ecológicos de Hoplosternum littorale através do estudo de sua dieta no Rio Vacacaí, RS. Para tal, foram realizadas coletas em todas as estações do ano em quatro pontos escolhidos ao longo do Rio Vacacaí, utilizando-se redes de espera com malhas 1,5; 2,0; 2,5; 3,0; 4,0; 5,0; 6,0 e 8,0 cm entre nós adjacentes. As redes permaneceram na água por 24 horas, sendo revisadas a cada seis horas. Os peixes capturados foram fixados em formol 10% e posteriormente conservados em álcool 70%. Os exemplares foram pesados, medidos e tiveram o trato digestório retirado para a análise da dieta. Os itens encontrados no conteúdo estomacal foram separados em seis categorias: Insetos, Moluscos, Detrito/Sedimento, Vegetais, Escamas e Nematoides, sendo cada categoria analisada pelos métodos de frequência de ocorrência e volumétrico, sendo estes combinados posteriormente para se obter o Índice Alimentar (IAi). O Grau de Repleção estomacal (GR) e o Índice de Repleção (IR) também foram estimados para avaliar a atividade alimentar de acordo com o ritmo circadiano. Os itens mais importantes na dieta dessa espécie de acordo com o IAi foram insetos, detrito/sedimento e vegetais. H. littorale apresentou maior atividade alimentar no inicio da manhã, coincidindo com uma maior captura também na revisão deste horário, o que sugere uma atividade noturna.Revista Brasileira Multidisciplinar - ReBraM2013-07-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://revistarebram.com/index.php/revistauniara/article/view/6310.25061/2527-2675/ReBraM/2013.v16i2.63Revista Brasileira Multidisciplinar - ReBraM; v. 16 n. 2 (2013): Julho/Dezembro; 55-652527-26751415-3580reponame:Revista Brasileira Multidisciplinarinstname:Universidade de Araraquara (UNIARA)instacron:UNIARAporhttp://revistarebram.com/index.php/revistauniara/article/view/63/42Zardo, Éverton LuísBehr, Everton Rodolfoinfo:eu-repo/semantics/openAccess2018-03-08T12:39:41Zoai:ojs.revistarebram.com:article/63Revistahttp://revistarebram.com/index.php/revistauniaraPRIhttps://revistarebram.com/index.php/revistauniara/oairevistauniara@uniara.com||2527-26752527-2675opendoar:2018-03-08T12:39:41Revista Brasileira Multidisciplinar - Universidade de Araraquara (UNIARA)false
dc.title.none.fl_str_mv Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, Brazil
Dieta e Ritmo Circadiano da Atividade Alimentar do Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Capturados no Rio Vacacaí, Rio Grande do Sul, Brasil
title Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, Brazil
spellingShingle Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, Brazil
Zardo, Éverton Luís
Feeding
Trophic spectrum
Hoplosternum littorale.
Alimentação
Espectro trófico
Hoplosternum littorale.
title_short Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, Brazil
title_full Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, Brazil
title_fullStr Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, Brazil
title_full_unstemmed Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, Brazil
title_sort Diet and Circadian Rhythm of the Feeding Activity of Tamoatá Hoplosternum Littorale (Hancock, 1828) (Siluriformes, Callichthydae) Captured In Vacacaí River, Rio Grande do Sul, Brazil
author Zardo, Éverton Luís
author_facet Zardo, Éverton Luís
Behr, Everton Rodolfo
author_role author
author2 Behr, Everton Rodolfo
author2_role author
dc.contributor.author.fl_str_mv Zardo, Éverton Luís
Behr, Everton Rodolfo
dc.subject.por.fl_str_mv Feeding
Trophic spectrum
Hoplosternum littorale.
Alimentação
Espectro trófico
Hoplosternum littorale.
topic Feeding
Trophic spectrum
Hoplosternum littorale.
Alimentação
Espectro trófico
Hoplosternum littorale.
description This paper aims at contributing to biological and ecological knowledge about Hoplosternum littorale by studying its diet in the Vacacaí River, RS. With this aim, samples were taken in all seasons in four points selected along the Vacacaí River, using gill nets with meshes 1.5, 2.0, 2.5, 3.0, 4.0; 5.0, 6.0 and 8.0 cm between adjacent knots. The nets remained in the water for 24 hours, being revised every six hours. The fish which was caught was fixed in 10% formalin and later preserved in 70% alcohol. The specimens were weighed, measured and had the digestive tract removed for diet analysis. The items found in stomach contents were separated into six categories: Insects, Mollusks, Detritus/Silt, Vegetables, Scales and Nematodes, each category being analyzed by frequency of occurrence and volumetric method, being combined to obtain the Feeding Index" (IAi). The stomach repletion index (SRI) and Repletion Index (RI) were also estimated to assess the feeding activity according to the circadian rhythm. The most important items in the diet of this species according to IAi were insects, sediment and plant. H. littorale showed greater feeding activity in early morning, coinciding with greater capture also in reviewing this time, suggesting a nocturnal activity.
publishDate 2013
dc.date.none.fl_str_mv 2013-07-10
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://revistarebram.com/index.php/revistauniara/article/view/63
10.25061/2527-2675/ReBraM/2013.v16i2.63
url http://revistarebram.com/index.php/revistauniara/article/view/63
identifier_str_mv 10.25061/2527-2675/ReBraM/2013.v16i2.63
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv http://revistarebram.com/index.php/revistauniara/article/view/63/42
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Revista Brasileira Multidisciplinar - ReBraM
publisher.none.fl_str_mv Revista Brasileira Multidisciplinar - ReBraM
dc.source.none.fl_str_mv Revista Brasileira Multidisciplinar - ReBraM; v. 16 n. 2 (2013): Julho/Dezembro; 55-65
2527-2675
1415-3580
reponame:Revista Brasileira Multidisciplinar
instname:Universidade de Araraquara (UNIARA)
instacron:UNIARA
instname_str Universidade de Araraquara (UNIARA)
instacron_str UNIARA
institution UNIARA
reponame_str Revista Brasileira Multidisciplinar
collection Revista Brasileira Multidisciplinar
repository.name.fl_str_mv Revista Brasileira Multidisciplinar - Universidade de Araraquara (UNIARA)
repository.mail.fl_str_mv revistauniara@uniara.com||
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