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House geckos share living quarters with humans in the tropical and subtropical regions inhabited by these reptiles. Gecko behavior, biological traits, continuous exposure to suspended particulate matter 0 µm in diameter (PM 10 ) and dust, as well as status as exotic species, motivated the choice of these species to examine environmental exposure to ambient air pollutants, in particular metals, and subsequent accumulation in these organisms. One part of the study was conducted in Tamaulipas (Mexico) where  Hemydactylus frenatus  is abundant in urban and industrial environments, the other part was conducted in Andalucia (Spain) where  Tarentola mauritanica  is found in similar environments. Adult geckos were collected on buildings in locations affected by various air pollution sources. For both species, higher metal contents were observed in whole-body (including digestive tracts) analysis and were markedly different between collection sites. Contents in tails, digestive tracts, and carcasses without digestive tracts were not correlated. Based on contamination factor values, bioaccumulation in  H. frenatus  tissues occurred for 12 of the 15 metals analyzed. Data suggest that  H. frenatus  might serve as a biomonitor for Cu, Ni, Pb, Cr, Li, and V, whereas  T. mauritanica  might be a biomonitor for Cu, Ni, Pb, and Cr. To our knowledge, metal contents for  H. frenatus  are reported here for the first time. House gecko data could be integrated into a highly representative monitoring system and health risk assessments related to air quality in residential areas.

journal of toxicology and environmental health, part a

Metal contents in house geckos (Squamata: Gekkonidae) from industrial and urban areas of southern Tamaulipas, Mexico and western Andalucía, Spain, may reflect airborne metal pollution