5 documents found, page 1 of 1
Ecotoxicological effects of fluvial eroded bitumen sediments from the Alberta o...
Cardoso, Diogo N.; Gonçalves, Sandra F.; Silva, Ana Rita R.; Soares, Amadeu M. V. M.; Wrona, Frederick J.; Loureiro, SusanaTo fully understand the ecological and cumulative effects of mining activities on the surrounding aquatic systems of the Canadian oil sands region, it is essential to understand the consequences of exposure to bitumen-containing soils/sediment from natural geomorphological processes. Both physical and chemical stress on aquatic biota can potentially result from exposure to natural bitumen, resulting from hillsl...
Assessing the acute and chronic toxicity of exposure to naturally occurring oil...
Cardoso, Diogo N.; Soares, Amadeu M. V. M.; Wrona, Frederick J.; Loureiro, SusanaIn the Athabasca region, the oil sands are located at or near the surface making open-pit mining viable. In addition, the Athabasca River and its tributaries flow through these oil sands deposits, thereby receiving bitumen-associated contaminants through natural fluvial erosional and weathering processes. A key knowledge gap has been related to understanding both the magnitude and significance of the toxicologi...
How life history influences the responses of the clam Scrobicularia plana to th...
Freitas, Rosa; Almeida, Ângela; Calisto, Vânia; Velez, Cátia; Moreira, Anthony; Schneider, Rudolf J.; Esteves, Valdemar I.; Wrona, Frederick J.In the present study, the bivalve Scrobicularia plana, collected from two contrasting areas (pristine location and mercury contaminated area), was selected to assess the biochemical alterations imposed by pH decrease, carbamazepine (an antiepileptic) and the combined effect of both stressors. The effects on oxidative stress related biomarkers after 96 h exposure revealed that pH decrease and carbamazepine induc...
The effects of salinity changes on the Polychaete Diopatra neapolitana: impacts...
Freitas, Rosa; Pires, Adília; Velez, Cátia; Almeida, Ângela; Wrona, Frederick J.; Soares, Amadeu M. V. M.; Figueira, EtelvinaPolychaetes have been identified by several authors as a group of marine invertebrates that respond rapidly to anthropogenic stressors. However, studies investigating alterations in Polychaetes affected by climate changes are scarce. Thus, the present study aimed to assess the impact of salinity changes (14, 21, 28, 35, 42 g/L) on the physiological and biochemical performance of the Polychaete Diopatra neapolit...
The effects of carbamazepine on macroinvertebrate species: comparing bivalves a...
Freitas, Rosa; Almeida, Ângela; Pires, Adília; Velez, Cátia; Calisto, Vânia; Schneider, Rudolf J.; Esteves, Valdemar I.; Wrona, Frederick J.In the present study, the bivalve Scrobicularia plana and the polychaete Diopatra neapolitana were exposed to an increasing carbamazepine (CBZ) concentration gradient. Both species are among the most widely used bioindicators, and CBZ is one of the most commonly found drugs in the aquatic environment. After a chronic exposure (28 days), the results obtained revealed that CBZ induced biochemical alterations in b...