Fuente: PubMed "booby" J Hazard Mater. 2026 May 1;508:141818. doi: 10.1016/j.jhazmat.2026.141818. Epub 2026 Mar 18.ABSTRACTRare earth elements (REEs) are increasingly recognized as emerging contaminants, yet field data remain scarce for tropical marine ecosystems and for seabird matrices beyond feathers. Here, we present a multi-matrix assessment of REEs across a tropical oceanic-coastal gradient in the South Atlantic, including, to our knowledge, the first measurements of REEs in seabird blood and eggs. We analyzed 311 samples including brown booby (Sula leucogaster) blood, feathers and eggs, fish muscle and liver, and crab muscle from a remote oceanic archipelago (SPSPA) and a nearshore coastal archipelago (Santana). ΣREE in seabird samples differed among matrices, with feathers generally showing higher median values than blood and eggs, underscoring matrix-specific integration of exposure. Spatial patterns were also matrix- and age-dependent: blood ΣREE showed no consistent site contrast, feather differences between sites were largely restricted to juveniles, and eggs showed higher ΣREE at Santana, indicating that maternal transfer provides a clear pathway for expressing site-specific exposure signals. In fishes, interspecific differences were detected at SPSPA in both liver and muscle, whereas no among-species difference was detected for muscle at Santana; liver often exceeded muscle, consistent with tissue-dependent accumulation. A screening-level dietary assessment indicated negligible carcinogenic risk from ΣREE exposure via edible fish muscle under adult and child scenarios, with intake distributions far below the provisional tolerable daily intake and zero exceedance probability. Overall, these results expand baseline REE knowledge for tropical marine food webs and highlight seabird eggs as a sensitive matrix for spatial comparisons.PMID:41921362 | DOI:10.1016/j.jhazmat.2026.141818