Results 31 to 40 of about 3,095 (182)

Application of modified simplex on the development of a preconcentration system for cadmium determination in sediments, food and cigarettes

Anais da Academia Brasileira de Ciências, 2016
A modified simplex algorithm was used to optimize a system of preconcentration for cadmium determination in samples of sediments, cigarettes and food using flame atomic absorption spectrometry.
QUEILA O. SANTOS, ISLANIA MORENO, LEANDRO DOS SANTOS, ALDENOR G. SANTOS, VALDINEI S. SOUZA, MARCOS A. BEZERRA   +5 more
doaj   +1 more source

Tracking the impact of bottom trawling on benthic habitat status

Conservation Biology, EarlyView.
Abstract Bottom trawling is the most widespread physical disturbance to marine benthic habitats, yet broadscale assessments of its impact remain limited. We developed a quantitative framework to evaluate trawling effects on benthic habitats at broad spatial scales based on the sentinels of seabed (SoS) indicator.
Maider Plaza‐Morlote, Ana García‐Alegre, Alberto Serrano, Ulla Fernández‐Arcaya, Antonio Punzón, Ana Rodríguez‐Rúa, Sara Roman, Ana Magro, Marina Delgado, Juan Gil, José Manuel González‐Irusta   +10 more
wiley   +1 more source

Bases metodológicas para el uso de la modelización en la enseñanza y comprensión de la dinámica litoral

Modelling in Science Education and Learning, 2017
El presente trabajo plantea el uso de la modelización para mejorar la comprensión de ciertos problemas ambientales del litoral. En concreto se incluye la base metodológica que se empleó para la construcción de un modelo consensuado de enseñanza que ...
Olga Mayoral García-Berlanga, Marta Talavera Ortega   +1 more
doaj   +1 more source

The influence of hydrological seasonality and land use and cover on the relationship between dissolved organic carbon and carbon dioxide along a karst‐draining large tropical river

Limnology and Oceanography, Volume 70, Issue 10, Page 2858-2871, October 2025.
Abstract The partial pressure of carbon dioxide (pCO2) in rivers is influenced by carbonate weathering, soil CO2, photosynthesis, and the mineralization of dissolved organic carbon (DOC). In tropical regions, elevated temperatures intensify these processes. However, their seasonal dynamics remain poorly understood in large karst‐draining rivers.
Daniel Cuevas‐Lara, Javier Alcocer, Felipe García‐Oliva, Salvador Sánchez‐Carrillo, Ismael Soria‐Reinoso, Luis A. Oseguera   +5 more
wiley   +1 more source

Monitoring mosaic biotopes in a marine conservation zone by autonomous underwater vehicle

Conservation Biology, Volume 33, Issue 5, Page 1174-1186, October 2019., 2019
Abstract The number of marine protected areas (MPAs) has increased dramatically in the last decade and poses a major logistic challenge for conservation practitioners in terms of spatial extent and the multiplicity of habitats and biotopes that now require assessment. Photographic assessment by autonomous underwater vehicle (AUV) enables the consistent
Noëlie M.A. Benoist, Kirsty J. Morris, Brian J. Bett, Jennifer M. Durden, Veerle A.I. Huvenne, Tim P. Le Bas, Russell B. Wynn, Suzanne J. Ware, Henry A. Ruhl   +8 more
wiley   +1 more source

Carbon dynamics in high‐Andean tropical cushion peatlands: A review of geographic patterns and potential drivers

Ecological Monographs, Volume 94, Issue 3, August 2024.
Abstract Peatlands store large amounts of carbon (C), a function potentially threatened by climate change. Peatlands composed of vascular cushion plants are widespread in the northern and central high Andes (páramo, wet and dry puna), but their C dynamics are hardly known.
Mary Carolina García Lino, Simon Pfanzelt, Alejandra I. Domic, Isabell Hensen, Karsten Schittek, Rosa Isela Meneses, Maaike Y. Bader   +6 more
wiley   +1 more source

Rainfall and Hydrograph Styles in Ephemeral Streams of the Drylands of Patagonia (South America–Argentina)

Water Resources Research, Volume 60, Issue 8, August 2024.
Abstract Ephemeral streams in dry environments can convey high intensity sediment‐laden flash floods. The study of these events is quite difficult due to remote locations with limited accessibility, unexpected events, rough weather conditions and safety concerns.
Gabriel Kaless, Héctor Malnero, Oscar Frumento, Miguel Pascual   +3 more
wiley   +1 more source

Importance of habitat heterogeneity in tidal flats to the conservation of migratory shorebirds

Conservation Biology, Volume 38, Issue 1, February 2024.
Abstract Understanding species distribution patterns and what determines them is critical for effective conservation planning and management. In the case of shorebirds migrating along the East Asian‐Australasian Flyway (EAAF), the loss of stopover habitat in the Yellow Sea region is thought to be the primary reason for the precipitous population ...
Shangxiao Cai, Tong Mu, He‐Bo Peng, Zhijun Ma, David S. Wilcove   +4 more
wiley   +1 more source

AVALIAÇÃO DA CONCENTRAÇÃO DE METAIS TOXICOS EM AMOSTRAS DE SEDIMENTOS DOS RESERVATÓRIOS DO COMPLEXO BILLINGS (GUARAPIRANGA E RIO GRANDE)

Geochimica Brasiliensis, 2018
O presente estudo teve como objetivo avaliar a concentração de metais tóxicos Cd, Cr, Cd, Hg, Ni, Pb e Zn e o semi-metal As e de outros metais de interesse, em amostras de sedimento superficial coletadas em pontos estratégicos no Sistema Billings ...
Larissa Souza Silva, Francisco Jorge Ferreira, Deborah Ines Teixeira Fávaro   +2 more
doaj   +1 more source

Caracterização granulométrica e mineralógica dos sedimentos como suporte para análise de contaminação ambiental em nascentes do rio Subaé, Feira de Santana (BA) [PDF]

Geochimica Brasiliensis, 2013
No presente artigo são apresentadas as composições mineralógica e gra-nulométrica de sedimentos coletados nas nascentes da bacia do rio Subaé, Feira de Santana, Bahia, como ferramenta de suporte para futuros trabalhos de avaliação geoquímica ...
Maria Alexandra Santivanez Cruz, Leila Thaise Santana de Oliveira Santos, Lilian Graicy Lima Morais Lima, Taise Bomfim de Jesus   +3 more
doaj