Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal)
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/11177 |
Resumo: | The current conceptual model of reinvasion and settlement for estuarine brachyuran crabs in mesotidal systems is that megalopae undergo selective tidal stream transport, in an upstream direction, and settle by the end of the flood tide. Recent studies on recruitment processes of Carcinus maenas (L.) have reported a clear decoupling between supply, as larval influx, and settlement events in the lower Mira Estuary (SW Portugal). We investigated, at high temporal resolution, whether overestimation of planktonic abundances and/or deviations of megalopal responses from the conceptual model were responsible for such decoupling. Daily settlement of megalopae was analyzed using regression and spectral analyses to identify periodicities and correlated with tidal amplitude. Hydrological parameters and supply, net flux and hourly concentration of megalopae in the plankton were addressed as factors influencing short, intermediate and long-term settlement, through 50 h sampling series. Supply and surface net flux levels of megalopae were similar and clearly decoupled from settlement on bottom-deployed collectors. Both hourly planktonic concentration and settlement patterns of megalopae fitted the conceptual model at high temporal resolution, with some deviations in terms of light intensity influences. Furthermore, our results suggest that processes preventing settlement and capable of overriding the influence of light intensities—such as turbulence—may explain the decoupling between supply and settlement of shore crab megalopae in the lower Mira Estuary. |
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Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal)SettlementSupplyNet fluxDecouplingMegalopaeTidal and semilunar rhythmsCarcinus maenasBottom-deployed collectorsThe current conceptual model of reinvasion and settlement for estuarine brachyuran crabs in mesotidal systems is that megalopae undergo selective tidal stream transport, in an upstream direction, and settle by the end of the flood tide. Recent studies on recruitment processes of Carcinus maenas (L.) have reported a clear decoupling between supply, as larval influx, and settlement events in the lower Mira Estuary (SW Portugal). We investigated, at high temporal resolution, whether overestimation of planktonic abundances and/or deviations of megalopal responses from the conceptual model were responsible for such decoupling. Daily settlement of megalopae was analyzed using regression and spectral analyses to identify periodicities and correlated with tidal amplitude. Hydrological parameters and supply, net flux and hourly concentration of megalopae in the plankton were addressed as factors influencing short, intermediate and long-term settlement, through 50 h sampling series. Supply and surface net flux levels of megalopae were similar and clearly decoupled from settlement on bottom-deployed collectors. Both hourly planktonic concentration and settlement patterns of megalopae fitted the conceptual model at high temporal resolution, with some deviations in terms of light intensity influences. Furthermore, our results suggest that processes preventing settlement and capable of overriding the influence of light intensities—such as turbulence—may explain the decoupling between supply and settlement of shore crab megalopae in the lower Mira Estuary.Inter Research2013-10-15T16:40:11Z2007-01-01T00:00:00Z2007info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/11177eng0171-863010.3354/meps07053Amaral, V.Queiroga, HenriqueSkov, M.Paula, J.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T11:19:10Zoai:ria.ua.pt:10773/11177Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:47:21.138465Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal) |
title |
Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal) |
spellingShingle |
Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal) Amaral, V. Settlement Supply Net flux Decoupling Megalopae Tidal and semilunar rhythms Carcinus maenas Bottom-deployed collectors |
title_short |
Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal) |
title_full |
Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal) |
title_fullStr |
Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal) |
title_full_unstemmed |
Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal) |
title_sort |
Planktonic availability and settlement of Carcinus maenas megalopae at high temporal resolution in the lower Mira Estuary (SW Portugal) |
author |
Amaral, V. |
author_facet |
Amaral, V. Queiroga, Henrique Skov, M. Paula, J. |
author_role |
author |
author2 |
Queiroga, Henrique Skov, M. Paula, J. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Amaral, V. Queiroga, Henrique Skov, M. Paula, J. |
dc.subject.por.fl_str_mv |
Settlement Supply Net flux Decoupling Megalopae Tidal and semilunar rhythms Carcinus maenas Bottom-deployed collectors |
topic |
Settlement Supply Net flux Decoupling Megalopae Tidal and semilunar rhythms Carcinus maenas Bottom-deployed collectors |
description |
The current conceptual model of reinvasion and settlement for estuarine brachyuran crabs in mesotidal systems is that megalopae undergo selective tidal stream transport, in an upstream direction, and settle by the end of the flood tide. Recent studies on recruitment processes of Carcinus maenas (L.) have reported a clear decoupling between supply, as larval influx, and settlement events in the lower Mira Estuary (SW Portugal). We investigated, at high temporal resolution, whether overestimation of planktonic abundances and/or deviations of megalopal responses from the conceptual model were responsible for such decoupling. Daily settlement of megalopae was analyzed using regression and spectral analyses to identify periodicities and correlated with tidal amplitude. Hydrological parameters and supply, net flux and hourly concentration of megalopae in the plankton were addressed as factors influencing short, intermediate and long-term settlement, through 50 h sampling series. Supply and surface net flux levels of megalopae were similar and clearly decoupled from settlement on bottom-deployed collectors. Both hourly planktonic concentration and settlement patterns of megalopae fitted the conceptual model at high temporal resolution, with some deviations in terms of light intensity influences. Furthermore, our results suggest that processes preventing settlement and capable of overriding the influence of light intensities—such as turbulence—may explain the decoupling between supply and settlement of shore crab megalopae in the lower Mira Estuary. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-01-01T00:00:00Z 2007 2013-10-15T16:40:11Z |
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 |
http://hdl.handle.net/10773/11177 |
url |
http://hdl.handle.net/10773/11177 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0171-8630 10.3354/meps07053 |
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 |
Inter Research |
publisher.none.fl_str_mv |
Inter Research |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799137524835155968 |