5 Works

Data from: A comparative study of ancient sedimentary DNA, pollen and macrofossils from permafrost sediments of northern Siberia reveals long-term vegetational stability

Tina Jørgensen, James Haile, Per Möller, Andrei Andreev, Sanne Boessenkool, Morten Rasmussen, Frank Kienast, Eric Coissac, Pierre Taberlet, Christian Brochmann, Nancy H. Bigelow, Kenneth Andersen, Ludovic Orlando, M. Thomas P. Gilbert & Eske Willerslev
Although ancient DNA from sediments (sedaDNA) has been used to investigate past ecosystems, the approach has never been directly compared to the traditional methods of pollen and macrofossil analysis. We conducted a comparative survey of 18 ancient permafrost samples spanning the Late Pleistocene (46–12.5 thousand years ago), from the Taymyr Peninsula in northern Siberia. The results show that pollen, macrofossils and sedaDNA are complementary rather than overlapping, and in combination reveal more detailed information on...

Data from: An updated 18S rRNA phylogeny of tunicates based on mixture and secondary structure models

Georgia Tsagkogeorga, Xavier Turon, Russell R. Hopcroft, Marie-Ka Tilak, Tamar Feldstein, Noa Shenkar, Yossi Loya, Dorothée Huchon, Emmanuel J. P. Douzery & Frédéric Delsuc
BACKGROUND: Tunicates have been recently revealed to be the closest living relatives of vertebrates. Yet, with more than 2500 described species, details of their evolutionary history are still obscure. From a molecular point of view, tunicate phylogenetic relationships have been mostly studied based on analyses of 18S rRNA sequences, which indicate several major clades at odds with the traditional class-level arrangements. Nonetheless, substantial uncertainty remains about the phylogenetic relationships and taxonomic status of key groups...

Data from: Pleistocene speciation in the genus Populus (Salicaceae)

Nicholas D. Levsen, Peter Tiffin & Matthew S. Olson
The macro-evolutionary consequences of recent climate change remain controversial and there is little paleobotanical or morphological evidence that Pleistocene (1.8-0.12 Ma) glacial cycles acted as drivers of speciation, especially among lineages with long generation times, such as trees. We combined genetic and ecogeographic data from two closely related North American tree species, Populus balsamifera and P. trichocarpa (Salicacaeae) to determine if their divergence coincided with and was possibly caused by Pleistocene climatic events. We analyzed...

Data from: Limitations on orchid recruitment: not a simple picture

Melissa K. McCormick, D. Lee Taylor, Katarina Juhaszova, , Dennis F. Whigham & John P. O'Neill
Mycorrhizal fungi have substantial potential to influence plant distribution, especially in specialized orchids and mycoheterotrophic plants. However, little is known about environmental factors that influence the distribution of mycorrhizal fungi. Previous studies using seed packets have been unable to distinguish whether germination patterns resulted from the distribution of appropriate edaphic conditions or the distribution of host fungi, as these cannot be separated using seed packets alone. We used a combination of organic amendments, seed packets,...

Data from: Heterogeneity in genetic diversity among non-coding loci fails to fit neutral coalescent models of population history

Jeffrey L. Peters, Trina E. Robert, Kevin Winker, Kevin G. McCracken & Trina E. Roberts
Inferring aspects of the population histories of species using coalescent analyses of non-coding nuclear DNA has grown in popularity. These inferences, such as divergence, gene flow, and changes in population size, assume that genetic data reflect simple population histories and neutral evolutionary processes. However, violating model assumptions can result in a poor fit between empirical data and the models. We sampled 22 nuclear intron sequences from at least 19 different chromosomes (a genomic transect) to...

Registration Year

  • 2011
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Resource Types

  • Dataset
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Affiliations

  • University of Alaska Fairbanks
    5
  • French National Centre for Scientific Research
    2
  • University of Cologne
    1
  • Lund University
    1
  • Natural History Museum
    1
  • University of Minnesota
    1
  • University of Oslo
    1
  • Spanish National Research Council
    1
  • Smithsonian Environmental Research Center
    1
  • University of Iowa
    1