Encontrados 11 documentos, a visualizar página 1 de 2
Long-term changes in the production by estuarine macrobenthos affected by multi...
Dolbeth, M.; Cardoso, P. G.; Grilo, T. F.; Bordalo, M. D.; Raffaelli, D.; Pardal, M. A.The macrobenthic production of an estuarine system was evaluated over a 14-year study period in a seagrass bed and in a sandflat. Over this period, the estuary suffered severe eutrophication and extreme weather events with important impacts on the community, impairing system functioning and ultimately the goods and services provided by the estuary (decline in the seagrass bed, decreased community production and...
Environmental effects on the recruitment variability of nursery species
Martinho, F.; Dolbeth, M.; Viegas, I.; Teixeira, C. M.; Cabral, H. N.; Pardal, M. A.The recruitment variability of the marine fish species Dicentrarchus labrax, Platichthys flesus and Solea solea was evaluated in the Mondego estuary (Portugal) from 2003 to 2007. The relationships between sea surface temperature, NAO index, coastal wind speed and direction, precipitation and river runoff prior to the estuarine colonization and the abundance of 0-group fish were evaluated using gamma-based Gener...
The role of two sediment-dwelling invertebrates on the mercury transfer from se...
Coelho, J. P.; Nunes, M.; Dolbeth, M.; Pereira, M. E.; Duarte, A. C.; Pardal, M. A.The annual total and organic mercury bioaccumulation pattern of Scrobicularia plana and Hediste diversicolor was assessed to evaluate the potential mercury transfer from contaminated sediments to estuarine food webs. S. plana was found to accumulate more total and organic mercury than H. diversicolor, up to 0.79 mg kg-1 and 0.15 mg kg-1 (wet weight) respectively, with a maximum annual uptake of 0.21 mg kg-1 y-1...
Estuarine production of resident and nursery fish species: Conditioning by drou...
Dolbeth, M.; Martinho, F.; Viegas, I.; Cabral, H.; Pardal, M. A.The production of resident (Pomatoschistus minutus and Pomatoschistus microps) and marine juvenile fish species using the Mondego estuary (central Portugal) as nursery grounds (Dicentrarchus labrax, Platichthys flesus, Solea solea), was assessed in order to: (1) understand the potential of the estuary for fish production; (2) know the production of nursery fish species likely to be exported to the coastal stock...
Assessing estuarine environmental quality using fish-based indices: Performance...
Martinho, F.; Viegas, I.; Dolbeth, M.; Leitão, R.; Cabral, H. N.; Pardal, M. A.http://www.sciencedirect.com/science/article/B6V6N-4TFDY7X-2/2/c9f9bbc565621cbb798d6d663e74a8fa
The influence of an extreme drought event in the fish community of a southern E...
Martinho, F.; Leitão, R.; Viegas, I.; Dolbeth, M.; Neto, J. M.; Cabral, H. N.; Pardal, M. A.Between 2003 and 2006, a severe drought occurred throughout the Mondego River catchment's area, inducing lower freshwater flows into the estuary. As a consequence, both 2004 and 2005 were considered as extreme drought events. From June 2003 to June 2006, the fish assemblage of the Mondego Estuary was sampled monthly in five stations during the night, using a 2 m beam trawl. Fish abundance was standardized as th...
Strategies of Pomatoschistus minutus and Pomatoschistus microps to cope with en...
Dolbeth, M.; Martinho, F.; Leitão, R.; Cabral, H.; Pardal, M. A.The populations of Pomatoschistus minutus and Pomatoschistus microps were studied from June 2003 to May 2006 in the Mondego estuary, in order to understand the ability of these species to withstand environmental variability. During this period a severe drought occurred (2005), with consequent lower freshwater runoff and higher salinity incursion into the estuary. Occasional abnormal high water temperatures were...
Anthropogenic and natural disturbance effects on a macrobenthic estuarine commu...
Dolbeth, M.; Cardoso, P. G.; Ferreira, S. M.; Verdelhos, T.; Raffaelli, D.; Pardal, M. A.For some decades, the Mondego estuary has been under severe ecological stress, mainly caused by eutrophication. The most visible effect was the occurrence of macroalgal blooms and the concomitant decrease of the area occupied by Zostera noltii beds. Since the end of 1998, mitigation measures were implemented in the estuary to promote the recovery of the seagrass beds and the entire surrounding environment. The ...
Strategies of Pomatoschistus minutus and Pomatoschistus microps to cope with en...
Dolbeth, M.; Martinho, F; Leitão, R.; Cabral, H.; Pardal, M. A.The populations of Pomatoschistus minutus and Pomatoschistus microps were studied from June 2003 to May 2006 in the Mondego estuary, in order to understand the ability of these species to withstand environmental variability. During this period a severe drought occurred (2005), with consequent lower freshwater runoff and higher salinity incursion into the estuary. Occasional abnormal high water temperatures were...
Population structure and species dynamics of Spisula solida, Diogenes pugilator...
Dolbeth, M.; Viegas, I.; Martinho, F.; Marques, J. C.; Pardal, M. A.The population structure, dynamics and distribution of Spisula solida, Diogenes pugilator and Branchiostoma lanceolatum, common species in the south coast of Portugal, were studied in a spatial–temporal manner in order to understand the influence of cross-shore sediment transport and anthropogenic activities. Spisula solida is harvested commercially, whereas D. pugilator and B. lanceolatum are non-target specie...
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