The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal)
Autor(a) principal: | |
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Data de Publicação: | 2001 |
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/10316/5431 https://doi.org/10.1016/S1146-609X(01)01112-2 |
Resumo: | The population density of Echinogammarus marinusin the Mondego estuary changed throughout the year, with a maximum during spring. The lowest densities were found in the north arm of the estuary, and the highest ones in the inner areas of the south arm. Higher densities appeared associated with the presence of muddy deposits under Fucus vesiculosus (Phaeophyta) and also with the presence of green macroalgae biomass over the sediments. Females were morphologically recognisable at smaller sizes than males, but males became larger than females. Fecundity increases with the size of females and is influenced by temperature and salinity. Sexual activity and recruitment take place continuously throughout the year, although it almost ceases by the end of winter. Present results are in opposition to the hypothesis of discontinuous recruitment presented in a previous study. Productivity (ash free dry weight- AFDW) was estimated at 1.74 to 2.45 g·m-2·year-1 in the north arm of the estuary corresponding to an annual turnover ratio () of 4.14 to 6.18. In the south arm, productivity was estimated at 1.96 to 2.74 g AFDW·m-2·year-1 in the middle section ( of 4.68 to 6.56), and at 3.85 to 5.38 g AFDW·m-2·year-1 in the innermost sampling area ( of 4.54 to 6.36). Differences in productivity appeared to depend only on population density, while annual ratios were similar over the estuary. Evidence was found that several features of E. marinus population dynamics were dependent on environmental factors resulting from the particular estuary hydraulic regime. |
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The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal)Echinogammarus marinusenvironmental factorspopulation dynamicsproductivityreproductive biologyThe population density of Echinogammarus marinusin the Mondego estuary changed throughout the year, with a maximum during spring. The lowest densities were found in the north arm of the estuary, and the highest ones in the inner areas of the south arm. Higher densities appeared associated with the presence of muddy deposits under Fucus vesiculosus (Phaeophyta) and also with the presence of green macroalgae biomass over the sediments. Females were morphologically recognisable at smaller sizes than males, but males became larger than females. Fecundity increases with the size of females and is influenced by temperature and salinity. Sexual activity and recruitment take place continuously throughout the year, although it almost ceases by the end of winter. Present results are in opposition to the hypothesis of discontinuous recruitment presented in a previous study. Productivity (ash free dry weight- AFDW) was estimated at 1.74 to 2.45 g·m-2·year-1 in the north arm of the estuary corresponding to an annual turnover ratio () of 4.14 to 6.18. In the south arm, productivity was estimated at 1.96 to 2.74 g AFDW·m-2·year-1 in the middle section ( of 4.68 to 6.56), and at 3.85 to 5.38 g AFDW·m-2·year-1 in the innermost sampling area ( of 4.54 to 6.36). Differences in productivity appeared to depend only on population density, while annual ratios were similar over the estuary. Evidence was found that several features of E. marinus population dynamics were dependent on environmental factors resulting from the particular estuary hydraulic regime.http://www.sciencedirect.com/science/article/B6VR3-43P3WF7-1/1/d1a4a5cba87181beec21476340ba07fb2001info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/5431http://hdl.handle.net/10316/5431https://doi.org/10.1016/S1146-609X(01)01112-2engActa Oecologica. 22:3 (2001) 139-152Maranhão, PauloBengala, NunoPardal, MiguelMarques, João Carlosinfo: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:RCAAP2020-11-06T16:59:57Zoai:estudogeral.uc.pt:10316/5431Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:55:29.696526Repositório 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 |
The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal) |
title |
The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal) |
spellingShingle |
The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal) Maranhão, Paulo Echinogammarus marinus environmental factors population dynamics productivity reproductive biology |
title_short |
The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal) |
title_full |
The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal) |
title_fullStr |
The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal) |
title_full_unstemmed |
The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal) |
title_sort |
The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal) |
author |
Maranhão, Paulo |
author_facet |
Maranhão, Paulo Bengala, Nuno Pardal, Miguel Marques, João Carlos |
author_role |
author |
author2 |
Bengala, Nuno Pardal, Miguel Marques, João Carlos |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Maranhão, Paulo Bengala, Nuno Pardal, Miguel Marques, João Carlos |
dc.subject.por.fl_str_mv |
Echinogammarus marinus environmental factors population dynamics productivity reproductive biology |
topic |
Echinogammarus marinus environmental factors population dynamics productivity reproductive biology |
description |
The population density of Echinogammarus marinusin the Mondego estuary changed throughout the year, with a maximum during spring. The lowest densities were found in the north arm of the estuary, and the highest ones in the inner areas of the south arm. Higher densities appeared associated with the presence of muddy deposits under Fucus vesiculosus (Phaeophyta) and also with the presence of green macroalgae biomass over the sediments. Females were morphologically recognisable at smaller sizes than males, but males became larger than females. Fecundity increases with the size of females and is influenced by temperature and salinity. Sexual activity and recruitment take place continuously throughout the year, although it almost ceases by the end of winter. Present results are in opposition to the hypothesis of discontinuous recruitment presented in a previous study. Productivity (ash free dry weight- AFDW) was estimated at 1.74 to 2.45 g·m-2·year-1 in the north arm of the estuary corresponding to an annual turnover ratio () of 4.14 to 6.18. In the south arm, productivity was estimated at 1.96 to 2.74 g AFDW·m-2·year-1 in the middle section ( of 4.68 to 6.56), and at 3.85 to 5.38 g AFDW·m-2·year-1 in the innermost sampling area ( of 4.54 to 6.36). Differences in productivity appeared to depend only on population density, while annual ratios were similar over the estuary. Evidence was found that several features of E. marinus population dynamics were dependent on environmental factors resulting from the particular estuary hydraulic regime. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001 |
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/10316/5431 http://hdl.handle.net/10316/5431 https://doi.org/10.1016/S1146-609X(01)01112-2 |
url |
http://hdl.handle.net/10316/5431 https://doi.org/10.1016/S1146-609X(01)01112-2 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Acta Oecologica. 22:3 (2001) 139-152 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
aplication/PDF |
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 |
instname_str |
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) |
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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 |
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1817553346536407040 |