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A short-term exposure to saxitoxin triggers a multitude of deleterious effects ...
Pinto, Albano; Macário, Inês P. E.; Marques, Sérgio M.; Lourenço, Joana; Domingues, Inês; Botelho, Maria João; Asselman, Jana; Pereira, PatríciaHarmful algal blooms and the toxins produced during these events are a human and environmental health concern worldwide. Saxitoxin and its derivatives are potent natural aquatic neurotoxins produced by certain freshwater cyanobacteria and marine algae species during these bloom events. Saxitoxins effects on human health are well studied, however its effects on aquatic biota are still largely unexplored. This wo...
Snapshot of resistome, virulome and mobilome in aquaculture
Salgueiro, Vanessa; Manageiro, Vera; Rosado, Tânia; Bandarra, Narcisa M.; Botelho, Maria João; Dias, Elsa; Caniça, ManuelaAquaculture environments can be hotspots for resistance genes through the surrounding environment. Our objective was to study the resistome, virulome and mobilome of Gram-negative bacteria isolated in seabream and bivalve molluscs, using a WGS approach. Sixty-six Gram-negative strains (Aeromonadaceae, Enterobacteriaceae, Hafniaceae, Morganellaceae, Pseudomonadaceae, Shewanellaceae, Vibrionaceae, and Yersiniacea...
A review on aquatic toxins: do we really know it all regarding the environmenta...
Pinto, Albano; Botelho, Maria João; Churro, Catarina; Asselman, Jana; Pereira, Patrícia; Pereira, Joana LuísaAquatic toxins are potent natural toxins produced by certain cyanobacteria and marine algae species during harmful cyanobacterial and algal blooms (CyanoHABs and HABs, respectively). These harmful bloom events and the toxins produced during these events are a human and environmental health concern worldwide, with occurrence, frequency and severity of CyanoHABs and HABs being predicted to keep increasing due to ...
Major characteristics of microplastics in mussels from the Portuguese coast
Marques, Filipa; Vale, Carlos; Rudnitskaya, Alisa; Moreirinha, Catarina; Costa, Sara T.; Botelho, Maria JoãoThe present study reports the quantity, shape, colour and chemical properties of microplastics (MP) and MP-like in whole soft tissues of the mussel Mytilus spp. collected in January and February 2019 from four natural banks in the Portuguese coast. Three sites are located in estuarine areas influenced by anthropogenic pressures and freshwater discharges, and one in the coast far from urbanised areas. An alkalin...
Assessing the bacterial community composition of bivalve mollusks collected in ...
Salgueiro, Vanessa; Lígia, Reis; Ferreira, Eugénia; Botelho, Maria João; Manageiro, Vera; Caniça, ManuelaAquaculture is a growing sector, providing several products for human consumption, and it is therefore important to guarantee its quality and safety. This study aimed to contribute to the knowledge of bacterial composition of Crassostrea gigas, Mytilus spp. and Ruditapes decussatus, and the antibiotic resistances/resistance genes present in aquaculture environments. Two hundred and twenty-two bacterial strains ...
Isolation and characterization of cylindrospermopsis raciborskii strains from f...
Menezes, Carina; Valério, Elisabete; Botelho, Maria João; Dias, ElsaIn the summer of 2015, an intense cyanobacterial bloom producing geosmin/2- methylisoborneol (MIB) occurred in the Roxo freshwater reservoir in Alentejo, Portugal. The drinking water supplied from the Roxo water treatment plant (WTP) exhibited an unpleasant odor/taste and a significant cyanobacteria density was detected in the finished water at the exit of the WTP. Cyanobacteria were not evaluated downstream of...
Paralytic shellfish toxin profiles in mussel, cockle and razor shell under post...
Botelho, Maria João; Marques, Filipa; Freitas, Rosa; Pires, Adília; Pereira, Eduarda; Vale, CarlosConcentrations of the paralytic shellfish toxins GTX6, C1+2, GTX5, C3+4, dcSTX, dcNEO and dcGTX2+3 were determined by LC-FLD in composite samples of whole soft tissues of mussels (Mytilus galloprovincialis), cockles (Cerastoderma edule) and razor shells (Solen marginatus) after exposure to a Gymnodinium catenatum bloom. Specimens were harvested weekly during three months under natural depuration conditions in t...
Successful isolation and cultivation of Cylindrospermopsis raciborskii strains ...
Menezes, Carina; Valério, Elisabete; Botelho, Maria João; Martins, Olga; Dias, ElsaThis work presents the successful establishment of Cylindrospermosis raciborskii cultures isolated from water samples collected at the exit point of Water Treatment Plant (WTP). An intense bloom dominated by filamentous cyanobacteria (Aphanizomenon spp., Planktothrix spp., Cylindrospermosis raciborskii, Anabaena spp.) occurred in the summer of 2015 in Roxo reservoir (south Portugal). Several cyanotoxins (microc...
Determination of paralytic shellfish toxins using potentiometric electronic tongue
Cruz, Marco G.N.; Ferreira, Nádia S.; Gomes, Maria Teresa S.R.; Botelho, Maria João; Costa, Sara T.; Vale, Carlos; Rudnitskaya, AlisaParalytic shellfish toxins (PSTs) are monitored in commercial bivalves in several countries in the world due to their toxicity to human consumers. The present work examines the application of an electronic tongue based on potentiometric chemical sensors to the quantification of PSTs in mussel extracts. The electronic tongue comprised six miniaturized sensors with solid inner contact and plasticized polyvinylchl...