Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil

Detalhes bibliográficos
Autor(a) principal: Neves, Luciano Peyrer das
Data de Publicação: 2008
Outros Autores: Rodrigues, Pedro de Sá, Bemvenuti, Carlos Emílio
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da FURG (RI FURG)
Texto Completo: http://repositorio.furg.br/handle/1/1833
Resumo: The temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil, was studied for a period of one year (June 2004 to May 2005) based on monthly sampling. Three sites were selected distant 50m from each other. At each site, 3 transects were established, 2m equidistant from one another. Each transect extended from the base of the primary dunes to the inner surf zone at approximately 1m in depth, with 7 or 8 sampling levels. Within transects, the distance between the levels was 20m until the upper swash zone, from which distance was 10m until the 1-meter isobath. The temporal variation in the abundance of benthic macrofauna observed in the present study can be attributed to (1) the positive effects of the recruitment peaks and migration of particular species to the swash zone and (2) negative effects of the migration of some species to deeper waters, as well (3) as mortality through natural causes (stranding and action of predators) and (4) human causes (harvesting and vehicle transit). We attribute the expressive abundance increase of benthic macrofauna to recruitment. The stranding, that is, the trapping of the organisms on the upper parts of the beach, is likely the main cause of abrupt drops in benthic macrofauna abundance.
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spelling Temporal variability of benthic macrofauna on Cassino beach, southernmost BrazilVariabilidade temporal da macrofauna bentônica na praia do Cassino, extremo sul do BrasilSandy beachesBenthic macrofaunaTemporal variationCassino beachPraias arenosasMacrofauna bentônicaVariabilidade temporalPraia do CassinoThe temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil, was studied for a period of one year (June 2004 to May 2005) based on monthly sampling. Three sites were selected distant 50m from each other. At each site, 3 transects were established, 2m equidistant from one another. Each transect extended from the base of the primary dunes to the inner surf zone at approximately 1m in depth, with 7 or 8 sampling levels. Within transects, the distance between the levels was 20m until the upper swash zone, from which distance was 10m until the 1-meter isobath. The temporal variation in the abundance of benthic macrofauna observed in the present study can be attributed to (1) the positive effects of the recruitment peaks and migration of particular species to the swash zone and (2) negative effects of the migration of some species to deeper waters, as well (3) as mortality through natural causes (stranding and action of predators) and (4) human causes (harvesting and vehicle transit). We attribute the expressive abundance increase of benthic macrofauna to recruitment. The stranding, that is, the trapping of the organisms on the upper parts of the beach, is likely the main cause of abrupt drops in benthic macrofauna abundance.A variabilidade temporal da macrofauna bentônica na praia do Cassino, Rio Grande do Sul, Brasil, foi estudada durante o período de um ano (junho 2004 a maio de 2005) com base em coletas mensais. Escolheram-se três locais, distantes 50m um do outro, sendo que em cada local foram fundadas três transversais 2m eqüidistantes. Cada transversal se estendeu desde a base das dunas primárias até aproximadamente 1m de profundidade no infralitoral. A distância dos níveis de coleta em cada transversal foi de 20m até o limite superior da zona de varrido, a partir do qual a distância foi de 10m. A variação temporal da abundância da macrofauna bentônica, constatada no presente trabalho pode ser atribuída a (1) efeitos positivos decorrentes dos picos de recrutamento e migração de determinadas espécies para a zona de varrido e a (2) efeitos negativos como a migração de algumas espécies para águas mais profundas, a (3) mortalidade por causas naturais (embancamento e ação dos predadores) e (4) antrópicas (extrativismo e o trânsito de veículos). Ao recrutamento é atribuída a responsabilidade pela expressiva elevação da abundância da macrofauna bentônica. Já o embancamento, isto é, o aprisionamento dos organismos nas partes superiores da praia, provavelmente seja a principal causa das abruptas quedas nas abundâncias do macrozoobentos.2012-03-06T03:22:03Z2012-03-06T03:22:03Z2008info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfNEVES, Luciano Peyrer das; RODRIGUES, Pedro de Sá; BEMVENUTI, Carlos Emílio. Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil. Iheringia, Série Zoologia, v. 98, n.1, p.36-44, 2008. Disponível em:<http://www.scielo.br/pdf/isz/v98n1/a05v98n1.pdf>. Acesso em: 12 jan. 2012.http://repositorio.furg.br/handle/1/1833engNeves, Luciano Peyrer dasRodrigues, Pedro de SáBemvenuti, Carlos Emílioinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da FURG (RI FURG)instname:Universidade Federal do Rio Grande (FURG)instacron:FURG2012-03-06T03:22:03Zoai:repositorio.furg.br:1/1833Repositório InstitucionalPUBhttps://repositorio.furg.br/oai/request || http://200.19.254.174/oai/requestopendoar:2012-03-06T03:22:03Repositório Institucional da FURG (RI FURG) - Universidade Federal do Rio Grande (FURG)false
dc.title.none.fl_str_mv Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil
Variabilidade temporal da macrofauna bentônica na praia do Cassino, extremo sul do Brasil
title Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil
spellingShingle Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil
Neves, Luciano Peyrer das
Sandy beaches
Benthic macrofauna
Temporal variation
Cassino beach
Praias arenosas
Macrofauna bentônica
Variabilidade temporal
Praia do Cassino
title_short Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil
title_full Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil
title_fullStr Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil
title_full_unstemmed Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil
title_sort Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil
author Neves, Luciano Peyrer das
author_facet Neves, Luciano Peyrer das
Rodrigues, Pedro de Sá
Bemvenuti, Carlos Emílio
author_role author
author2 Rodrigues, Pedro de Sá
Bemvenuti, Carlos Emílio
author2_role author
author
dc.contributor.author.fl_str_mv Neves, Luciano Peyrer das
Rodrigues, Pedro de Sá
Bemvenuti, Carlos Emílio
dc.subject.por.fl_str_mv Sandy beaches
Benthic macrofauna
Temporal variation
Cassino beach
Praias arenosas
Macrofauna bentônica
Variabilidade temporal
Praia do Cassino
topic Sandy beaches
Benthic macrofauna
Temporal variation
Cassino beach
Praias arenosas
Macrofauna bentônica
Variabilidade temporal
Praia do Cassino
description The temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil, was studied for a period of one year (June 2004 to May 2005) based on monthly sampling. Three sites were selected distant 50m from each other. At each site, 3 transects were established, 2m equidistant from one another. Each transect extended from the base of the primary dunes to the inner surf zone at approximately 1m in depth, with 7 or 8 sampling levels. Within transects, the distance between the levels was 20m until the upper swash zone, from which distance was 10m until the 1-meter isobath. The temporal variation in the abundance of benthic macrofauna observed in the present study can be attributed to (1) the positive effects of the recruitment peaks and migration of particular species to the swash zone and (2) negative effects of the migration of some species to deeper waters, as well (3) as mortality through natural causes (stranding and action of predators) and (4) human causes (harvesting and vehicle transit). We attribute the expressive abundance increase of benthic macrofauna to recruitment. The stranding, that is, the trapping of the organisms on the upper parts of the beach, is likely the main cause of abrupt drops in benthic macrofauna abundance.
publishDate 2008
dc.date.none.fl_str_mv 2008
2012-03-06T03:22:03Z
2012-03-06T03:22:03Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv NEVES, Luciano Peyrer das; RODRIGUES, Pedro de Sá; BEMVENUTI, Carlos Emílio. Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil. Iheringia, Série Zoologia, v. 98, n.1, p.36-44, 2008. Disponível em:<http://www.scielo.br/pdf/isz/v98n1/a05v98n1.pdf>. Acesso em: 12 jan. 2012.
http://repositorio.furg.br/handle/1/1833
identifier_str_mv NEVES, Luciano Peyrer das; RODRIGUES, Pedro de Sá; BEMVENUTI, Carlos Emílio. Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil. Iheringia, Série Zoologia, v. 98, n.1, p.36-44, 2008. Disponível em:<http://www.scielo.br/pdf/isz/v98n1/a05v98n1.pdf>. Acesso em: 12 jan. 2012.
url http://repositorio.furg.br/handle/1/1833
dc.language.iso.fl_str_mv eng
language eng
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.source.none.fl_str_mv reponame:Repositório Institucional da FURG (RI FURG)
instname:Universidade Federal do Rio Grande (FURG)
instacron:FURG
instname_str Universidade Federal do Rio Grande (FURG)
instacron_str FURG
institution FURG
reponame_str Repositório Institucional da FURG (RI FURG)
collection Repositório Institucional da FURG (RI FURG)
repository.name.fl_str_mv Repositório Institucional da FURG (RI FURG) - Universidade Federal do Rio Grande (FURG)
repository.mail.fl_str_mv
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