2026-06-06T04:19:36Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/156942026-02-03T12:28:29Zcom_10630_2254col_10630_37959

00925njm 22002777a 4500 dc Gordo Puertas, Elisa author Cañete-Hidalgo, Sergio Andrés author Dueñas-Buey, Mª Concepción author López-Gordillo, Francisco Javier author Carmona-Fernández, Raquel author Liger-Pérez, Esperanza author Pastor-Vega, José Manuel author Pérez-Martínez, Manuel author Ruiz-Cruces, Rafael author 2018-05-11 Seaweeds are known to be useful environmental bioindicators since they bioaccumulate radioisotopes at very low environmental concentrations. Levels of natural radionuclides in six ecologically relevant brown and red seaweed species from Arctic coasts (Kongsfjorden, Spitsbergen, Svalbard Islands) were analysed in the present study, in order to characterise the levels of natural radioactivity in this ecosystem and to compare this with previously published data in coastal areas from other latitudes. Thalli were collected by SCUBA divers at different depths in Hansneset in September 2014 and transported immediately to the laboratory. Young thalli, free from macroscopic epibiota, were dried, powdered and confined in a standard geometry before gamma spectrometry measurements. Then, the radioactivity of 7Be, 40K, 208Tl, 210Pb, 212Pb, 226Ra and 228Ra was measured by high-resolution gamma spectrometry using high-purity germanium detectors for 172800 s. Detectors were calibrated using a traceable multi gamma standard source and results are on a dry weight and fresh weight basis and are decay corrected to the date of sampling. Our results revealed the influence of cosmogenic radionuclides in the intertidal zone, as shown by the unique presence of 7Be in the brown macroalga Fucus distichus, the only analysed species inhabiting the intertidal. High concentrations of 40K were observed in all species, as this is one of the essential elements in biota. Remarkably is the high content of 210Pb in the red seaweeds Phycodrys rubens and Ptilota gunneri, suggesting that these species might possess a higher capacity for heavy metals bioaccumulation than the analysed brown seaweeds. https://hdl.handle.net/10630/15694 Algas - Regiones árticas Isótopos radioactivos Radionuclides in arctic marine macroalgae from Kongsfjorden (Svalbard)