Journal of Biometrics & Biostatistics

Otto Appenzeller

Publications

• Research Article
  Biological Rhythms, Metabolism and Function in Feathered Dinosaurs; As Determined by Biostatistics
  Author(s): Clifford Qualls, Spencer G Lucas, Mike Spilde and Otto AppenzellerClifford Qualls, Spencer G Lucas, Mike Spilde and Otto Appenzeller
  
          Rotation of the earth around the sun paces daily biologic rhythms (circadian rhythms). Additional rhythms spanning days are mutidien. The energy for biologic rhythms is provided by metabolism.     We measured biologic rhythms in dinosaur’s fossilized feather and rachis imprints and in contemporaneous wild turkey tail-feather.         Daily growth lines were measured in 9 photographs of dinosaur feather-imprints. They were from an enantiornithine bird (Mesozoic 245-265 million years), from a troodontid theropod (Cretaceous ~160 million years) and from Sinosauropteryx (Early Cretaceous; ~125 million years; rachis only). We measured 27 growth lines and 39 rachis intervals in the turkey feather. We compared our measurements in the dinosaurs to those in the modern feather. We used biometrics to analyze the measurements, we f.. Read More»
  DOI: 10.4172/2155-6180.1000326

  Abstract PDF