Fisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical rivers

The long-term impacts of large hydroelectric dams on small-scale fisheries in tropical rivers are poorly known. A promising way to investigate such impacts is to compare and integrate the local ecological knowledge (LEK) of resource users with biological data for the same region. We analyzed the acc...

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Autores: Hallwass, Gustavo, Lopes, Priscila Fabiana Macedo, Juras, Anastácio Afonso, Silvano, Renato Azevedo Matias
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:Brasil
Recursos:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositorio:Repositório Institucional da UFRGS
Idioma:inglés
OAI Identifier:oai:www.lume.ufrgs.br:10183/115287
Acesso em linha:http://hdl.handle.net/10183/115287
Access Level:acceso abierto
Palavra-chave:Ecologia humana
Pesca
Hidroeletricas
Impacto ambiental : Hidreletricas
Amazônia : Brasil
Tocantins, Rio
Brazilian Amazon
Fisheries management
Freshwater fish
Human ecology
Hydroelectric dams
Impact assessment
Interviews
Small-scale fisheries
Tocantins River
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spelling 2015-04-14T01:57:47Z20131051-0761http://hdl.handle.net/10183/115287000906958The long-term impacts of large hydroelectric dams on small-scale fisheries in tropical rivers are poorly known. A promising way to investigate such impacts is to compare and integrate the local ecological knowledge (LEK) of resource users with biological data for the same region. We analyzed the accuracy of fishers’ LEK to investigate fisheries dynamics and environmental changes in the Lower Tocantins River (Brazilian Amazon) downstream from a large dam. We estimated fishers’ LEK through interviews with 300 fishers in nine villages and collected data on 601 fish landings in five of these villages, 22 years after the dam’s establishment (2006–2008). We compared these two databases with each other and with data on fish landings from before the dam’s establishment (1981) gathered from the literature. The data obtained based on the fishers’ LEK (interviews) and from fisheries agreed regarding the primary fish species caught, the most commonly used type of fishing gear (gill nets) and even the most often used gill net mesh sizes but disagreed regarding seasonal fish abundance. According to the interviewed fishers, the primary environmental changes that occurred after the impoundment were an overall decrease in fish abundance, an increase in the abundance of some fish species and, possibly, the local extinction of a commercial fish species (Semaprochilodus brama). These changes were corroborated by comparing fish landings sampled before and 22 years after the impoundment, which indicated changes in the composition of fish landings and a decrease in the total annual fish production. Our results reinforce the hypothesis that large dams may adversely affect small-scale fisheries downstream and establish a feasible approach for applying fishers’ LEK to fisheries management, especially in regions with a low research capacity.application/pdfengEcological applications. Washington. Vol. 23 (Mar. 2013), p. 392-407Ecologia humanaPescaHidroeletricasImpacto ambiental : HidreletricasAmazônia : BrasilTocantins, RioBrazilian AmazonFisheries managementFreshwater fishHuman ecologyHydroelectric damsImpact assessmentInterviewsSmall-scale fisheriesTocantins RiverFisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical riversEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSHallwass, GustavoLopes, Priscila Fabiana MacedoJuras, Anastácio AfonsoSilvano, Renato Azevedo MatiasORIGINAL000906958.pdf000906958.pdfTexto completo (inglês)application/pdf2634465http://www.lume.ufrgs.br/bitstream/10183/115287/1/000906958.pdf75664c9af15fa875127b3f83f5e582caMD51TEXT000906958.pdf.txt000906958.pdf.txtExtracted Texttext/plain85118http://www.lume.ufrgs.br/bitstream/10183/115287/2/000906958.pdf.txt791d2a986eccc1345695e20968e2b896MD52THUMBNAIL000906958.pdf.jpg000906958.pdf.jpgGenerated Thumbnailimage/jpeg1727http://www.lume.ufrgs.br/bitstream/10183/115287/3/000906958.pdf.jpg506dd8e0005981007296036cf37733ecMD5310183/1152872018-10-19 10:44:07.295oai:www.lume.ufrgs.br:10183/115287Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2018-10-19T13:44:07Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Fisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical rivers
title Fisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical rivers
spellingShingle Fisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical rivers
Hallwass, Gustavo
Ecologia humana
Pesca
Hidroeletricas
Impacto ambiental : Hidreletricas
Amazônia : Brasil
Tocantins, Rio
Brazilian Amazon
Fisheries management
Freshwater fish
Human ecology
Hydroelectric dams
Impact assessment
Interviews
Small-scale fisheries
Tocantins River
title_short Fisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical rivers
title_full Fisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical rivers
title_fullStr Fisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical rivers
title_full_unstemmed Fisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical rivers
title_sort Fisher´s knowledge identifies environmental changes and fish abundance trends in impounded tropical rivers
dc.creator.none.fl_str_mv Hallwass, Gustavo
Lopes, Priscila Fabiana Macedo
Juras, Anastácio Afonso
Silvano, Renato Azevedo Matias
author Hallwass, Gustavo
author_facet Hallwass, Gustavo
Lopes, Priscila Fabiana Macedo
Juras, Anastácio Afonso
Silvano, Renato Azevedo Matias
author_role author
author2 Lopes, Priscila Fabiana Macedo
Juras, Anastácio Afonso
Silvano, Renato Azevedo Matias
author2_role author
author
author
dc.subject.por.fl_str_mv Ecologia humana
Pesca
Hidroeletricas
Impacto ambiental : Hidreletricas
Amazônia : Brasil
Tocantins, Rio
topic Ecologia humana
Pesca
Hidroeletricas
Impacto ambiental : Hidreletricas
Amazônia : Brasil
Tocantins, Rio
Brazilian Amazon
Fisheries management
Freshwater fish
Human ecology
Hydroelectric dams
Impact assessment
Interviews
Small-scale fisheries
Tocantins River
dc.subject.eng.fl_str_mv Brazilian Amazon
Fisheries management
Freshwater fish
Human ecology
Hydroelectric dams
Impact assessment
Interviews
Small-scale fisheries
Tocantins River
description The long-term impacts of large hydroelectric dams on small-scale fisheries in tropical rivers are poorly known. A promising way to investigate such impacts is to compare and integrate the local ecological knowledge (LEK) of resource users with biological data for the same region. We analyzed the accuracy of fishers’ LEK to investigate fisheries dynamics and environmental changes in the Lower Tocantins River (Brazilian Amazon) downstream from a large dam. We estimated fishers’ LEK through interviews with 300 fishers in nine villages and collected data on 601 fish landings in five of these villages, 22 years after the dam’s establishment (2006–2008). We compared these two databases with each other and with data on fish landings from before the dam’s establishment (1981) gathered from the literature. The data obtained based on the fishers’ LEK (interviews) and from fisheries agreed regarding the primary fish species caught, the most commonly used type of fishing gear (gill nets) and even the most often used gill net mesh sizes but disagreed regarding seasonal fish abundance. According to the interviewed fishers, the primary environmental changes that occurred after the impoundment were an overall decrease in fish abundance, an increase in the abundance of some fish species and, possibly, the local extinction of a commercial fish species (Semaprochilodus brama). These changes were corroborated by comparing fish landings sampled before and 22 years after the impoundment, which indicated changes in the composition of fish landings and a decrease in the total annual fish production. Our results reinforce the hypothesis that large dams may adversely affect small-scale fisheries downstream and establish a feasible approach for applying fishers’ LEK to fisheries management, especially in regions with a low research capacity.
publishDate 2013
dc.date.issued.fl_str_mv 2013
dc.date.accessioned.fl_str_mv 2015-04-14T01:57:47Z
dc.type.driver.fl_str_mv Estrangeiro
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/115287
dc.identifier.issn.pt_BR.fl_str_mv 1051-0761
dc.identifier.nrb.pt_BR.fl_str_mv 000906958
identifier_str_mv 1051-0761
000906958
url http://hdl.handle.net/10183/115287
dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Ecological applications. Washington. Vol. 23 (Mar. 2013), p. 392-407
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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