Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods
The objective of this study was to evaluate how inter-annual changes in freshwater inputs have affected the decapod assemblages in the Guadiana estuary. Three major areas in the estuary were sampled during the summer, in 2001 (high inflow year and before the filling of the Alqueva dam), in 2002 (low...
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Station Biologique de Roscoff
2014
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/5314 2023-05-15T17:35:57+02:00 Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods Encarnação, João Leitão, Tânia Morais, P. Piló, David Range, Pedro Chícharo, Luís Chicharo, Alexandra 2014-10-10T10:38:59Z http://hdl.handle.net/10400.1/5314 eng eng Station Biologique de Roscoff Encarnação, João; Tânia Leitão; Morais, Pedro; Piló, David; Range, Pedro; Chícharo, Luís; Chícharo, Maria Alexandra. Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods, Cahiers de Biologie Marine, 54, 2, 181-189, 2013. 0007-9723 AUT: LCH00360; MCH00377; http://hdl.handle.net/10400.1/5314 openAccess Alqueva dam Freshwater regularization Inter-annual shifts Crangon crangon Palaemon macrodactylus Palaemon longirostris article 2014 ftunivalgarve 2022-05-30T08:46:11Z The objective of this study was to evaluate how inter-annual changes in freshwater inputs have affected the decapod assemblages in the Guadiana estuary. Three major areas in the estuary were sampled during the summer, in 2001 (high inflow year and before the filling of the Alqueva dam), in 2002 (low inflow and after filling of the Alqueva dam), and in 2008 and 2009 (low inflow and after consolidation of the impacts of the Alqueva dam). A significant increase in total decapod densities was recorded for the entire estuary, but especially in the upper estuary, after the closure of the dam in 2002. Changes in salinity, turbidity and temperature, which were mainly due to changes in freshwater input and climatic influence (North Atlantic Oscillation index), had an important influence on the structure of the decapod crustacean assemblages. The major conclusions of the study were that, following the construction of the Alqueva dam and regularization of the freshwater inflow, the decapod crustacean community in the Guadiana estuary changed and a shift of the dominant decapod species to upper zones of the estuary happened. These changes, and the presence of the non-native Palaemon macrodactylus in 2008 and 2009, further enhance the importance of estuarine monitoring studies to improve ecologists’ knowledge on distinguishing and understanding natural changes and anthropogenic impacts in the ecosystem. Effets des variations interannuelles d’apports d’eau douce sur la structure d’une communauté estuarienne de décapodes. L’objectif de cette étude était d’évaluer comment les variations interannuelles d’apports d’eau douce affectent l’assemblage de décapodes dans l’estuaire du Guadiana. Trois grands domaines de l’estuaire ont été échantillonnés en été : en 2001 (année d’apports importants et avant le remplissage du barrage d’Alqueva), en 2002 (faible apport d’eau douce et après le remplissage du barrage d’Alqueva), en 2008 et 2009 (après la consolidation de l’impact du barrage d’Alqueva). Une augmentation significative de la ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Universidade do Algarve: Sapienta |
institution |
Open Polar |
collection |
Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
Alqueva dam Freshwater regularization Inter-annual shifts Crangon crangon Palaemon macrodactylus Palaemon longirostris |
spellingShingle |
Alqueva dam Freshwater regularization Inter-annual shifts Crangon crangon Palaemon macrodactylus Palaemon longirostris Encarnação, João Leitão, Tânia Morais, P. Piló, David Range, Pedro Chícharo, Luís Chicharo, Alexandra Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods |
topic_facet |
Alqueva dam Freshwater regularization Inter-annual shifts Crangon crangon Palaemon macrodactylus Palaemon longirostris |
description |
The objective of this study was to evaluate how inter-annual changes in freshwater inputs have affected the decapod assemblages in the Guadiana estuary. Three major areas in the estuary were sampled during the summer, in 2001 (high inflow year and before the filling of the Alqueva dam), in 2002 (low inflow and after filling of the Alqueva dam), and in 2008 and 2009 (low inflow and after consolidation of the impacts of the Alqueva dam). A significant increase in total decapod densities was recorded for the entire estuary, but especially in the upper estuary, after the closure of the dam in 2002. Changes in salinity, turbidity and temperature, which were mainly due to changes in freshwater input and climatic influence (North Atlantic Oscillation index), had an important influence on the structure of the decapod crustacean assemblages. The major conclusions of the study were that, following the construction of the Alqueva dam and regularization of the freshwater inflow, the decapod crustacean community in the Guadiana estuary changed and a shift of the dominant decapod species to upper zones of the estuary happened. These changes, and the presence of the non-native Palaemon macrodactylus in 2008 and 2009, further enhance the importance of estuarine monitoring studies to improve ecologists’ knowledge on distinguishing and understanding natural changes and anthropogenic impacts in the ecosystem. Effets des variations interannuelles d’apports d’eau douce sur la structure d’une communauté estuarienne de décapodes. L’objectif de cette étude était d’évaluer comment les variations interannuelles d’apports d’eau douce affectent l’assemblage de décapodes dans l’estuaire du Guadiana. Trois grands domaines de l’estuaire ont été échantillonnés en été : en 2001 (année d’apports importants et avant le remplissage du barrage d’Alqueva), en 2002 (faible apport d’eau douce et après le remplissage du barrage d’Alqueva), en 2008 et 2009 (après la consolidation de l’impact du barrage d’Alqueva). Une augmentation significative de la ... |
format |
Article in Journal/Newspaper |
author |
Encarnação, João Leitão, Tânia Morais, P. Piló, David Range, Pedro Chícharo, Luís Chicharo, Alexandra |
author_facet |
Encarnação, João Leitão, Tânia Morais, P. Piló, David Range, Pedro Chícharo, Luís Chicharo, Alexandra |
author_sort |
Encarnação, João |
title |
Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods |
title_short |
Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods |
title_full |
Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods |
title_fullStr |
Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods |
title_full_unstemmed |
Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods |
title_sort |
effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods |
publisher |
Station Biologique de Roscoff |
publishDate |
2014 |
url |
http://hdl.handle.net/10400.1/5314 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Encarnação, João; Tânia Leitão; Morais, Pedro; Piló, David; Range, Pedro; Chícharo, Luís; Chícharo, Maria Alexandra. Effects of inter-annual freshwater inflow shifts on the community structure of estuarine decapods, Cahiers de Biologie Marine, 54, 2, 181-189, 2013. 0007-9723 AUT: LCH00360; MCH00377; http://hdl.handle.net/10400.1/5314 |
op_rights |
openAccess |
_version_ |
1766135267473752064 |