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Valenzuela, L.O., Chesson, L.A., O’Grady, S.P., Cerling, T.E. and Ehleringer, J.R. (2011) Spatial distributions of carbon, nitrogen and sulfur isotope ratios in human hair across the central United States. Rapid Communications in Mass Spectrometry, 25, 861-868. doi:10.1002/rcm.4934

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• TITLE: “Alas poor Yorick”: What retrospective analysis of canine skulls can tell us about the impact of environmental factors on health

  AUTHORS: Luciano O. Valenzuela, Kevin Chase, Lawrence McGill, Shawn Miller, Mark Nielsen, Karl G. Lark

  KEYWORDS: Portuguese Water Dog; Necropsy; Histopathology; Exercise; Nutrition; Stable Isotope; Skull; Dentine; Collagen

  JOURNAL NAME: Open Journal of Animal Sciences, Vol.3 No.3A, July 17, 2013

  ABSTRACT: Necropsies and extensive histological evaluation for clinical and sub-clinical disease of approximately three hundred Portuguese Water dogs are available as part of an ongoing study to assess their state of health at the end of life. Throughout life these dogs enjoyed a variety of lifestyles and environments. Here we carry out retrospective quantitative assessments of life-time dietary input and physical activity for each dog. To do this, collagens from skull vault bone and from dentine have been analyzed for ratios of stable isotopes to determine differences in diet that individual dogs experienced during late or early life respectively. Robustness of skull bone (weight/unit of skull size) was used as a relative indicator of the amount of physical activity experienced during a dog’s lifetime. These environmental parameters were correlated with the frequency and severity of specific disease processes determined at necropsy. Both measures were shown to exert significant low-level (r