5 Works

Data from: Tunicates and not cephalochordates are the closest living relatives of vertebrates

Frédéric Delsuc, Henner Brinkmann, Daniel Chourrout & Hervé Philippe
Tunicates or urochordates (appendicularians, salps and sea squirts), cephalochordates (lancelets) and vertebrates (including lamprey and hagfish) constitute the three extant groups of chordate animals. Traditionally, cephalochordates are considered as the closest living relatives of vertebrates, with tunicates representing the earliest chordate lineage. This view is mainly justified by overall morphological similarities and an apparently increased complexity in cephalochordates and vertebrates relative to tunicates. Despite their critical importance for understanding the origins of vertebrates, phylogenetic studies...

Data from: The timing of eukaryotic evolution: Does a relaxed molecular clock reconcile proteins and fossils?

Emmanuel J. P. Douzery, Elizabeth A. Snell, Eric Bapteste, Frédéric Delsuc & Hervé Philippe
The use of nucleotide and amino acid sequences allows improved understanding of the timing of evolutionary events of life on earth. Molecular estimates of divergence times are, however, controversial and are generally much more ancient than suggested by the fossil record. The limited number of genes and species explored and pervasive variations in evolutionary rates are the most likely sources of such discrepancies. Here we compared concatenated amino acid sequences of 129 proteins from 36...

Data from: Why migrate during the day: a comparative analysis of North American birds

Guy Beauchamp
Migration can take place primarily during the day, or at night, or during both depending on the species. Why the timing of migration varies among species has been the object of much research but the underlying ecological processes are still unclear. Proximally, migration timing may be influenced by the timing of other activities or may be more prevalent in species that migrate over long distances. Adaptive scenarios emphasize the reduction in flight costs at night...

Data from: The role of predators in maintaining the geographic organization of aposematic signals

Mathieu Chouteau & Bernard Angers
Selective predation of aposematic signals is expected to promote phenotypic uniformity. But while uniform within a population, numerous species display impressive variations in warning signals among adjacent populations. Predators from different localities learning to avoid distinct signals while performing intense selection on others are thus expected to maintain such a geographic organization. We tested this assumption by placing clay frog models, representing distinct color morphs of the Peruvian poison-dart frog Ranitomeya imitator and a non...

Data from: Plasticity of animal genome architecture unmasked by rapid evolution of a pelagic tunicate

France Denoeud, Simon Henriet, Sutada Mungpakdee, Jean-Marc Aury, Corinne Da Silva, Henner Brinkmann, Jana Mikhaleva, Lisbeth C. Olsen, Claire Jubin, Cristian Cañestro, Jean-Marie Bouquet, Gemma Danks, Julie Poulain, Coen Campsteijn, Marcin Adamski, Ismael Cross, Fekadu Yadetie, Matthieu Muffato, Alexandra Louis, Stephen Butcher, Georgia Tsagkogeorga, Anke Konrad, Sarabdeep Singh, Marit F. Jensen, Evelyne Huynh Cong … & Daniel Chourrout
Genomes of animals as different as sponges and humans show conservation of global architecture. Here we show that multiple genomic features including transposon diversity, developmental gene repertoire, physical gene order, and intron-exon organization are shattered in the tunicate Oikopleura, belonging to the sister group of vertebrates and retaining chordate morphology. Ancestral architecture of animal genomes can be deeply modified and may therefore be largely nonadaptive. This rapidly evolving animal lineage thus offers unique perspectives on...

Registration Year

  • 2011
    5

Resource Types

  • Dataset
    5

Affiliations

  • University of Montreal
    5
  • University of Bergen
    2
  • Centre de Recherches de Jouy-en-Josas
    1
  • École Normale Supérieure Paris-Saclay
    1
  • University of Wyoming
    1
  • Genoscope
    1
  • University of Oregon
    1
  • Claude Bernard University Lyon 1
    1
  • National Center for Biotechnology Information
    1
  • University of Basel
    1