Temporal variability of benthic macrofauna on Cassino beach, southernmost Brazil
Autor(a) principal: | |
---|---|
Data de Publicação: | 2008 |
Outros Autores: | , |
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. |
id |
FURG_1f010319b603f94ef2c84cd0fa3f0af8 |
---|---|
oai_identifier_str |
oai:repositorio.furg.br:1/1833 |
network_acronym_str |
FURG |
network_name_str |
Repositório Institucional da FURG (RI FURG) |
repository_id_str |
|
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 |
|
_version_ |
1813187246704033792 |