10 Works

A reassessment of the enigmatic diapsid Paliguana whitei and the early history of Lepidosauromorpha

David Paul Ford, Susan Evans, Jonah Choiniere, Vincent Fernandez & Roger Benson
Lepidosaurs include lizards, snakes, amphisbaenians and the tuatara, comprising a highly speciose evolutionary radiation with widely varying anatomical traits. Their stem-lineage originated by the late middle Permian 259 million years ago, but its early fossil record is poorly documented, obscuring the origins of key anatomical and functional traits of the group. Paliguana whitei, from the Early Triassic of South Africa, is an enigmatic fossil species with potential to provide information on this. However, its anatomy...

Phylogenetic analysis of HIV-1 shows frequent cross-country transmission and local population expansions

Marc Bennedbæk, Anna Zhukova, Man-Hung Eric Tang, Jaclyn Bennet, Paula Munderi, Kiat Ruxrungtham, Magnus Gisslen, Michael Worobey, Jens D Lundgren & Rasmus L Marvig
Understanding of pandemics depends on characterization of pathogen collections from well-defined and demographically diverse cohorts. Since its emergence in Congo almost a century ago, HIV-1 has geographically spread and genetically diversified into distinct viral subtypes. Phylogenetic analysis can be used to reconstruct the ancestry of the virus to inform on the origin and distribution of subtypes. We sequenced two 3.6 kb amplicons of HIV-1 genomes from 3,197 participants in a clinical trial with consistent and...

Seismograms and snapshot files for dynamic models (crack and shear sources)

Lindsay Linzer, Mark Hildyard & Johan Wesseloo
This paper presents a numerical investigation on the influence of the mining environment on seismic sources with a focus of pillar failure mechanisms in tabular mining. We investigate the influence of the stope on seismic inversions for the scalar moment, corner frequency, source radius, stress drop and moment tensor through dynamic numerical modelling using elastodynamic modelling software, WAVE3D. The main objective is to determine whether the source parameters calculated from the recorded waveforms are due...

Data from: Interspecific variation in post-disturbance growth responses of a savanna tree community and its implications for escaping the fire trap

Julienne E. NeSmith, Wayne Twine & Ricardo M. Holdo
Vegetation states in savannas are highly sensitive to tree growth rates, which determine whether individual trees can ‘escape’ periodic disturbances. Resprouting trees have lopsided shoot:root ratios and are often multi-stemmed, and these variables can modify post-disturbance growth rates and therefore the probability of escape. To date, few studies have systematically examined the implications of interspecific variation in these factors for escape. We conducted a two-year field experiment in lowveld savanna in South Africa and quantified...

Datasets for phylogenetic analyses of Pavlomulina ranunculiformis

Ryoma Kamikawa, Masanobu Kawachi, Takuro Nakayama, Motoki Kayama, Mami Nomura, Hideaki Miyashita, Othman Bojo, Lesley Rhodes, Stuart Sym, Richard Pienaar, Ian Probert & Isao Inouye
Rapidly accumulating genetic data from environmental sequencing approaches have revealed an extraordinary level of unsuspected diversity within marine phytoplankton, which is responsible for around 50% of global net primary production. However, the phenotypic identity of many of the organisms distinguished by environmental DNA sequences remains unclear. The rappemonads are a plastid-bearing protistan lineage that to date has only been identified by environmental plastid 16S rRNA sequences. The phenotypic identity of this group, which does not...

Data from: Malar stripe size and prominence in peregrine falcons vary positively with solar radiation: Support for the solar glare hypothesis

Michelle Vrettos, Chevonne Reynolds & Arjun Amar
Many falcons (Falco spp.) exhibit a distinct dark plumage patch below the eye, termed the malar stripe. This stripe is hypothesised to reduce the amount of solar glare reflected into the eyes while foraging, thereby increasing hunting efficiency in bright conditions. Here, we use a novel, global-scale correlative approach to test this “solar glare hypothesis” in peregrine falcons (Falco peregrinus), the most widespread falcon species, using web-sourced photographs from across the species’ global range. We...

The past, present, and future of herbivore impacts on savanna vegetation

Ann Carla Staver, Joel Abraham, Gareth Hempson, Allison Karp & J Faith
1) Herbivory is a key process structuring vegetation in savannas, especially in Africa where large mammal herbivore communities remain intact. Exclusion experiments consistently show that herbivores impact savanna vegetation, but effect size variation has resisted explanation, limiting our understanding of the past, present, and future roles of herbivory in savanna ecosystems. 2) Synthesis of vegetation responses to herbivore exclusion shows that herbivory decreased grass abundance by 57.0% and tree abundance by 30.6% across African savannas....

Seasonal strategies differ between tropical and extratropical herbivores

Joel Abraham, Gareth Hempson, Tyler Faith & Carla Staver
Seasonal diet shifts and migration are key components of large herbivore population dynamics, but we lack a systematic understanding of how these behaviors are distributed on a macroecological scale. The prevalence of seasonal strategies is likely related to herbivore body size and feeding guild, and may also be influenced by properties of the environment, such as soil nutrient availability and climate seasonality. We evaluated the distribution of seasonal dietary shifts and migration across large-bodied mammalian...

Data from: New information on the Jurassic lepidosauromorph Marmoretta oxoniensis

Elizabeth Griffiths, David Ford, Roger Benson & Susan E. Evans
The earliest known crown-group lepidosaurs are known from the Middle Triassic, however their stem group is poorly sampled, with only a few representative fossils found. This is partly due to the small size and delicate bones of early stem-lepidosaurs (=lepidosauromorphs) which make both preservation in the fossil record and subsequent discovery less likely. The mid Jurassic lepidosauromorph Marmoretta oxoniensis Evans 1991 is re-examined using high-resolution µCT scanning to reveal parts of the skull anatomy that...

Speculative Practices: Visual explorations, in understanding place making in transient contexts

Brigitta Stone-Johnson

Registration Year

  • 2021
    10

Resource Types

  • Dataset
    9
  • Conference Paper
    1

Affiliations

  • University of the Witwatersrand
    10
  • Princeton University
    2
  • University College London
    2
  • University of Utah
    2
  • Yale University
    2
  • University of Oxford
    2
  • University of Georgia
    1
  • Tohoku University
    1
  • University of Gothenburg
    1
  • University of Leeds
    1