“…Due to similarities in charge and atomic radius, Sr substitutes for calcium (Ca) in biological systems (Å berg 1995) and thus both primary producers and higher-level consumers record information about local geology in the 87 Sr/ 86 Sr of their tissues. Some of the most well documented examples of using 87 Sr/ 86 Sr for geo-location are the analysis of tooth enamel and bone apatite from human remains to reconstruct movements of historic (Price et al 2002, Hodell et al 2004, Bentley 2006, Montgomery 2010, Price et al 2011) and modern (Aggarwal et al 2008, Juarez 2008 Sr have been used to investigate the regions-of-origin of foods and drugs consumed by humans, including coffee (Rodrigues et al 2010, Rodrigues et al 2011, dairy products (Rossmann et al 2000, Crittenden et al 2007, juice , heirloom vegetables (Swoboda et al 2008), wine (Almeida and Vasconcelos 2004), and marijuana (West et al 2009). Measured 87 Sr/ 86 Sr has also proven useful in reconstructing the movements of non-human animals, most especially birds (Chamberlain et al 1997, Font et al 2007, Sellick et al 2009) and fish (Ingram and Weber 1999, Kennedy et al 2000, Barnett-Johnson et al 2008.…”