The Lower Madeira River (Western Amazon) is a hotspot for mercury (Hg) contamination due to both natural geochemical enrichment and long-term anthropogenic activities. Total mercury (THg) concentrations were significantly higher in marsupials (median = 0.136 mg kg −1 ) than in rodents (median = 0.032 mg kg −1 , p = 0.0006). Arboreal rodents showed lower Hg levels than omnivorous rodents. Terrestrial rodents showed higher Hg co...

Mitochondrial DNA remains a cornerstone for molecular ecology, especially for study species from which high‐quality tissue samples cannot be easily obtained. Methods using mitochondrial markers are usually reliant on reference databases, but these are often incomplete. Furthermore, available mitochondrial genomes often lack crucial metadata, such as sampling location, limiting their utility for many analyses. Here, we assemble...