Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances

Detalhes bibliográficos
Autor(a) principal: Pereira,Larissa Strictar
Data de Publicação: 2016
Outros Autores: Agostinho,Angelo Antonio, Delariva,Rosilene Luciana
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Neotropical ichthyology (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100221
Resumo: ABSTRACT The increase in abundance of small-sized fishes is common after a reservoir is formed. There is an increase in the consumption of fish, from typically piscivorous fish to opportunistic species that take advantage of abundant resources. This study aims to evaluate the effects of diet changes induced by damming on the feeding activity and condition factor of typically piscivorous (Hoplias aff. malabaricus and Oligosarcus longirostris ) and opportunistic (Astyanax lacustris (ex Astyanax altiparanae ) and Pimelodus britskii ). Sampling was conducted before and after the impoundment in the Iguaçu River in the region of Salto Caxias, Paraná State, Brazil. Stomach contents were analysed by the volumetric method. Feeding activity and body condition were inferred by the mean stomach repletion index and the mean condition factor. Typically piscivorous species presented a general tendency of decreased feeding activity and increased condition factor, while opportunistic species, presented a decrease in condition and feeding activity in the most affected sites. The increase in the condition factor of piscivorous fish suggests that these species benefit by the increased abundance of small size prey fish. Some opportunist species that do not have adjustments for the piscivorous diet, regardless of the intensity of consumption and resource availability, can suffer negative reflex when adopting a piscivorous diet.
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spelling Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundancesCondition factorFeeding activityOpportunist dietPiscivoryReservoirABSTRACT The increase in abundance of small-sized fishes is common after a reservoir is formed. There is an increase in the consumption of fish, from typically piscivorous fish to opportunistic species that take advantage of abundant resources. This study aims to evaluate the effects of diet changes induced by damming on the feeding activity and condition factor of typically piscivorous (Hoplias aff. malabaricus and Oligosarcus longirostris ) and opportunistic (Astyanax lacustris (ex Astyanax altiparanae ) and Pimelodus britskii ). Sampling was conducted before and after the impoundment in the Iguaçu River in the region of Salto Caxias, Paraná State, Brazil. Stomach contents were analysed by the volumetric method. Feeding activity and body condition were inferred by the mean stomach repletion index and the mean condition factor. Typically piscivorous species presented a general tendency of decreased feeding activity and increased condition factor, while opportunistic species, presented a decrease in condition and feeding activity in the most affected sites. The increase in the condition factor of piscivorous fish suggests that these species benefit by the increased abundance of small size prey fish. Some opportunist species that do not have adjustments for the piscivorous diet, regardless of the intensity of consumption and resource availability, can suffer negative reflex when adopting a piscivorous diet.Sociedade Brasileira de Ictiologia2016-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100221Neotropical Ichthyology v.14 n.1 2016reponame:Neotropical ichthyology (Online)instname:Sociedade Brasileira de Ictiologia (SBI)instacron:SBI10.1590/1982-0224-20150044info:eu-repo/semantics/openAccessPereira,Larissa StrictarAgostinho,Angelo AntonioDelariva,Rosilene Lucianaeng2016-04-26T00:00:00Zoai:scielo:S1679-62252016000100221Revistahttp://www.ufrgs.br/ni/https://old.scielo.br/oai/scielo-oai.php||neoichth@nupelia.uem.br1982-02241679-6225opendoar:2016-04-26T00:00Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI)false
dc.title.none.fl_str_mv Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances
title Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances
spellingShingle Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances
Pereira,Larissa Strictar
Condition factor
Feeding activity
Opportunist diet
Piscivory
Reservoir
title_short Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances
title_full Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances
title_fullStr Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances
title_full_unstemmed Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances
title_sort Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances
author Pereira,Larissa Strictar
author_facet Pereira,Larissa Strictar
Agostinho,Angelo Antonio
Delariva,Rosilene Luciana
author_role author
author2 Agostinho,Angelo Antonio
Delariva,Rosilene Luciana
author2_role author
author
dc.contributor.author.fl_str_mv Pereira,Larissa Strictar
Agostinho,Angelo Antonio
Delariva,Rosilene Luciana
dc.subject.por.fl_str_mv Condition factor
Feeding activity
Opportunist diet
Piscivory
Reservoir
topic Condition factor
Feeding activity
Opportunist diet
Piscivory
Reservoir
description ABSTRACT The increase in abundance of small-sized fishes is common after a reservoir is formed. There is an increase in the consumption of fish, from typically piscivorous fish to opportunistic species that take advantage of abundant resources. This study aims to evaluate the effects of diet changes induced by damming on the feeding activity and condition factor of typically piscivorous (Hoplias aff. malabaricus and Oligosarcus longirostris ) and opportunistic (Astyanax lacustris (ex Astyanax altiparanae ) and Pimelodus britskii ). Sampling was conducted before and after the impoundment in the Iguaçu River in the region of Salto Caxias, Paraná State, Brazil. Stomach contents were analysed by the volumetric method. Feeding activity and body condition were inferred by the mean stomach repletion index and the mean condition factor. Typically piscivorous species presented a general tendency of decreased feeding activity and increased condition factor, while opportunistic species, presented a decrease in condition and feeding activity in the most affected sites. The increase in the condition factor of piscivorous fish suggests that these species benefit by the increased abundance of small size prey fish. Some opportunist species that do not have adjustments for the piscivorous diet, regardless of the intensity of consumption and resource availability, can suffer negative reflex when adopting a piscivorous diet.
publishDate 2016
dc.date.none.fl_str_mv 2016-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100221
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100221
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1982-0224-20150044
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Ictiologia
publisher.none.fl_str_mv Sociedade Brasileira de Ictiologia
dc.source.none.fl_str_mv Neotropical Ichthyology v.14 n.1 2016
reponame:Neotropical ichthyology (Online)
instname:Sociedade Brasileira de Ictiologia (SBI)
instacron:SBI
instname_str Sociedade Brasileira de Ictiologia (SBI)
instacron_str SBI
institution SBI
reponame_str Neotropical ichthyology (Online)
collection Neotropical ichthyology (Online)
repository.name.fl_str_mv Neotropical ichthyology (Online) - Sociedade Brasileira de Ictiologia (SBI)
repository.mail.fl_str_mv ||neoichth@nupelia.uem.br
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