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25 results on '"Bellas, J."'

3. Sentinels of Seabed (SoS) indicator: Assessing benthic habitats condition using typical and sensitive species

Author

Serrano, A., primary, de la Torriente, A., additional, Punzón, A., additional, Blanco, M., additional, Bellas, J., additional, Durán-Muñoz, P., additional, Murillo, F.J., additional, Sacau, M., additional, García-Alegre, A., additional, Antolínez, A., additional, Elliott, S., additional, Guerin, L., additional, Vina-Herbón, C., additional, Marra, S., additional, and González-Irusta, J.M., additional

Published
2022
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4. Sentinels of Seabed (SoS) indicator: Assessing benthic habitats condition using typical and sensitive species

Author

Serrano, A., De La Torriente, A., Punzón, A., Blanco, M., Bellas, J., Durán-muñoz, P., Murillo, F.j., Sacau, M., García-alegre, A., Antolínez, A., Elliott, S., Guerin, L., Vina-herbón, C., Marra, S., González-irusta, J.m., Serrano, A., De La Torriente, A., Punzón, A., Blanco, M., Bellas, J., Durán-muñoz, P., Murillo, F.j., Sacau, M., García-alegre, A., Antolínez, A., Elliott, S., Guerin, L., Vina-herbón, C., Marra, S., and González-irusta, J.m.

Abstract

Indicators are key tools used to assess the ecological status of the environment for ecosystem based management. Anthropogenic disturbances produce changes to habitat condition, which include modifications in species composition and their functions. Monitoring a group of sentinel species (from a taxonomic and functional point of view) provides useful insights into benthic habitat condition. Here, a new indicator, Sentinels of the Seabed (SoS) is proposed to assess state of benthic habitats using “sentinel” species (species which are characteristic of a habitat and sensitive to a given pressure). The selection of these sentinel species has two stages. First, a ‘typical species set’ is computed using intra-habitat similarity and frequency under reference conditions. Second, the ‘sentinel species set’ is generated by selecting the most sensitive species from the typical species set. This selection is made using specific indexes able to assess species sensitivity to a particular pressure. The SoS indicator method was tested on six case studies and two different pressure types (trawling disturbance and pollution), using data from otter trawl, box-corer and Remote Operate Vehicle images. In each scenario, the SoS indicator was compared to the Shannon-Wiener diversity index, Margalef index and total biomass, being the only metric, which showed the expected significant negative response to pressure in all cases. Our results shows that SoS was highly effective in assessing benthic habitats status under both physical and chemical pressures, regardless of the sampling gear, the habitat, or the case study, showing a great potential to be a useful tool in the management of marine ecosystems.

Published
2022
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8. Effects of microplastics alone or co-exposed with copper on early life stages of zebrafish (Danio rerio)

Author

Santos, D., Félix, L. (Luís), Luzio, A. (Ana), Parra-Descalzo, S. (Santiago), Matos, C. (Carlos), Bellas, J. (Juan), and Monteiro, S.M.

Subjects
congenital, hereditary, and neonatal diseases and abnormalities, Behavior, Heavy metals, Oxidative stress, nutritional and metabolic diseases, Embryotoxicity, Plastic particles, skin and connective tissue diseases
Abstract

Data about the toxicological interactions of MPs and heavy metals in biota is limited, particularly in fish early life stages. This study aimed to evaluate the toxicological effects of MPs and copper (Cu), alone or combined, in zebrafish early life stages. Embryos were exposed from 2 until 96-h post-fertilization (hpf) to MPs (2 mg/L), three sub-lethal concentrations of Cu (15, 60 and 125 μg/L) and binary mixtures containing Cu and MPs (Cu15+MPs, Cu60+MPs, Cu125+MPs). Lethal and sub-lethal parameters, histopathological changes, biochemical biomarkers, gene expression and behavior were assessed. Our findings showed that Cu and Cu + MPs decreased embryos survival and hatching rate. Increased ROS levels were observed in larvae exposed to the two lowest Cu and Cu + MPs groups, suggesting an induction of oxidative stress. An increased CAT and GPx activities were observed in Cu and Cu + MPs, implying a response of the antioxidant defense system to overcome the metal and MPs stress. The sod1 expression was downregulated in all Cu groups and in the two highest Cu + MPs exposed groups. AChE was significantly inhibited in Cu and Cu + MPs groups, indicating neurotoxicity. A disruption of avoidance and social behaviors were also noticed in the Cu125 and Cu125+MPs exposed larvae. Evidences of Cu-toxicity modulation by MPs were observed in some endpoints. Overall, the findings of this study highlight that Cu alone or co-exposed with MPs lead to oxidative stress, neurotoxicity and ultimately behavioral alterations in early life stages of zebrafish, while MPs alone do not produce significant effects on zebrafish larvae.

Published
2020

9. Sediment metal enrichment and ecological risk assessment of ten ports and estuaries in the World Harbours Project

Author

Birch, G.F., primary, Lee, J.-H., additional, Tanner, E., additional, Fortune, J., additional, Munksgaard, N., additional, Whitehead, J., additional, Coughanowr, C., additional, Agius, J., additional, Chrispijn, J., additional, Taylor, U., additional, Wells, F., additional, Bellas, J., additional, Besada, V., additional, Viñas, L., additional, Soares-Gomes, A., additional, Cordeiro, R.C., additional, Machado, W., additional, Santelli, R.E., additional, Vaughan, M., additional, Cameron, M., additional, Brooks, P., additional, Crowe, T., additional, Ponti, M., additional, Airoldi, L., additional, Guerra, R., additional, Puente, A., additional, Gómez, A.G., additional, Zhou, G.J., additional, Leung, K.M.Y., additional, and Steinberg, P., additional

Published
2020
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10. Ingestion and contact with polyethylene microplastics does not cause acute toxicity on marine zooplankton

Author

Beiras, R., primary, Bellas, J., additional, Cachot, J., additional, Cormier, B., additional, Cousin, X., additional, Engwall, M., additional, Gambardella, C., additional, Garaventa, F., additional, Keiter, S., additional, Le Bihanic, F., additional, López-Ibáñez, S., additional, Piazza, V., additional, Rial, D., additional, Tato, T., additional, and Vidal-Liñán, L., additional

Published
2018
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25. Sediment metal enrichment and ecological risk assessment of ten ports and estuaries in the World Harbours Project

Author

Laura Airoldi, Roberta Guerra, M. Vaughan, Tasman P. Crowe, Wilson Machado, C. Coughanowr, Guang-Jie Zhou, Victoria Besada, Paul R. Brooks, J.-H. Lee, J. Chrispijn, U. Taylor, F. Wells, Gavin F. Birch, Lucía Viñas, Araceli Puente, Ricardo Erthal Santelli, M. Cameron, Niels C. Munksgaard, Kenneth M.Y. Leung, Juan Bellas, Renato Campello Cordeiro, Aina G. Gómez, Peter D. Steinberg, Abilio Soares-Gomes, J. Whitehead, J. Agius, J. Fortune, Massimo Ponti, Edwina Tanner, Birch, G.F., Lee, J.-H., Tanner, E., Fortune, J., Munksgaard, N., Whitehead, J., Coughanowr, C., Agius, J., Chrispijn, J., Taylor, U., Wells, F., Bellas, J., Besada, V., Viñas, L., Soares-Gomes, A., Cordeiro, R.C., Machado, W., Santelli, R.E., Vaughan, M., Cameron, M., Brooks, P., Crowe, T., Ponti, M., Airoldi, L., Guerra, R., Puente, A., Gómez, A.G., Zhou, G.J., Leung, K.M.Y., and Steinberg, P.

Subjects
0106 biological sciences, Geologic Sediments, Medio Marino y Protección Ambiental, Environmental indices, Normalisation, Classification scheme, 010501 environmental sciences, Aquatic Science, Oceanography, Risk Assessment, 01 natural sciences, Anthropogenic change, Rivers, Metals, Heavy, Centro Oceanográfico de Vigo, Humans, Ecological risk, 0105 earth and related environmental sciences, computer.programming_language, geography.geographical_feature_category, River sediment, Quality assessment, 010604 marine biology & hydrobiology, Sediment, Estuary, Sediment quality guidelines Environmental indices Anthropogenic change Normalisation Classification scheme Ravenna, Pollution, Port (computer networking), Fishery, Geography, Harbour, Hong Kong, Sediment quality guidelines, Estuaries, computer, Water Pollutants, Chemical, Environmental Monitoring
Abstract

Ten global harbours were assessed for sediment quality by quantifying the magnitude of anthropogenic change and ecological risk. Anthropogenic change (enrichment) was high for Derwent River and Sydney estuary, moderate for Santander Harbour, Rio de Janeiro and Dublin Port, slight for Hong Kong, minimal for Darwin. All 10 enrichment indices used showed similar results. Derwent River sediment was rated at high ecological risk, followed by Sydney and Santander estuaries with moderate risk. Auckland and Darwin sediments exhibited minimal ecological risk and sediment in the remaining harbours (Dublin, Hong Kong, Ravenna, Ria de Vigo and Rio de Janeiro) were assessed at slight ecological risk. The extraordinary variety of environments and types/quantities/qualities of data investigated resulted in as much a critique and development of methodology, as an assessment of human impact, including unique techniques for elemental normalisation and contaminant classification. Recommendations for an improved technical framework for sediment quality assessment are provided., Sí

Published
2020

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