Browsing by Author "c7110d0e-ca4a-4b43-9832-2c924aa46df3"

Now showing items 1-7 of 7

    • A giant soft-shelled egg from the Late Cretaceous of Antarctica 
      Legendre, Lucas J.; Rubilar Rogers, David; Musser, Grace M.; Davis, Sarah N.; Otero, Rodrigo A.; Vargas, Alexander O.; Clarke, Julia A. (Nature, 2020)
      Egg size and structure reflect important constraints on the reproductive and life-history characteristics of vertebrates(1). More than two-thirds of all extant amniotes lay eggs(2). During the Mesozoic era (around 250 ...
    • An Epigenetic Perspective on the Midwife Toad Experiments of Paul Kammerer (1880–1926) 
      Vargas, Alexander O.; Krabichler, Quirin; Guerrero-Bosagna, Carlos (John Wiley and Sons Inc., 2017)
      © 2016 Wiley Periodicals, Inc. Paul Kammerer was the most outstanding neo-Lamarckian experimentalist of the early 20th century. He reported spectacular results in the midwife toad, including crosses of environmentally ...
    • Commentary beyond selection 
      Vargas, Alexander O. (2005)
      It has been argued that the study of natural selection and quantitative genetics should have a central role in evolutionary thinking and undergraduate teaching in Chile. Extensive operational use of the concept of natural ...
    • Developmental evolution of the distal ankle in the dinosaur-bird transition 
      Ossa Fuentes, Luis; Soto Acuña, Sergio; Bona, Paula; Sallaberry, Michel; Vargas, Alexander O. (Wiley, 2020)
      The adult ankle of early reptiles had five distal tarsal (dt) bones, but in Dinosauria, these were reduced to only two: dt3 and dt4, articulated to metatarsals (mt) mt3 and mt4. Birds have a single distal tarsal ossification ...
    • Greater Growth of Proximal Metatarsals in Bird Embryos and the Evolution of Hallux Position in the Grasping Foot 
      Botelho, João Francisco; Smith Paredes, Daniel; Soto Acuña, Sergio; Núñez-León, Daniel; Palma, Verónica; Vargas, Alexander O. (John Wiley and Sons Inc., 2017)
      © 2016 Wiley Periodicals, Inc. In early theropod dinosaurs—the ancestors of birds—the hallux (digit 1) had an elevated position within the foot and had lost the proximal portion of its metatarsal. It no longer articulated ...
    • How ancient is the adult swimming capacity in the lineage leading to Euchordates? 
      Vargas, Alexander O.; Aboitiz, Francisco (2005)
    • The developmental origin of zygodactyls feet and its possible loss in the evolution of passeriformes 
      Botelho, João Francisco; Smith Paredes, Daniel; Núñez León, Daniel; Soto Acuña, Sergio; Vargas, Alexander O. (Royal Society, 2014)
      The zygodactyl orientation of toes (digits II and III pointing forwards, digits I and IV pointing backwards) evolved independently in different extant bird taxa. To understand the origin of this trait in modern birds, we ...