9 Works

Data from: Functional MRI in the Nile crocodile: a new avenue for evolutionary neurobiology

Mehdi Behroozi, Brendon K. Billings, Xavier Helluy, Paul R. Manger, Onur Güntürkün & Felix Ströckens
Crocodilians are important for understanding the evolutionary history of amniote neural systems as they are the nearest extant relatives of modern birds and share a stem amniote ancestor with mammals. Although the crocodilian brain has been investigated anatomically, functional studies are rare. Here we employed fMRI, never tested in poikilotherms, to investigate crocodilian telencephalic sensory processing. Juvenile Crocodylus niloticus were placed in a 7T MRI scanner to record BOLD signal changes during presentation of visual...

Data from: A new species of burnetiid (Therapsida, Burnetiamorpha) from the early Wuchiapingian of South Africa and implications for the evolutionary ecology of the family Burnetiidae.

Michael O. Day, Roger M. H. Smith, Julien Benoit, Vincent Fernandez & Bruce S. Rubidge
Burnetiidae is a family of basal therapsids that is known from late Permian-aged (Lopingian) sequences from southern and eastern Africa and European Russia. Recent discoveries of related genera within the broader clade Burnetiamorpha have added to our understanding of morphological variation in the group but have eroded the list of characters defining the family Burnetiidae. We describe a new burnetiid taxon, Leucocephalus wewersi gen. et sp. nov., and argue that Burnetiidae can be defined by,...

Data from: Evolutionary rates of mid-Permian tetrapods from South Africa and the role of temporal resolution in turnover reconstruction

Michael O. Day, Roger B.J. Benson, Christian F. Kammerer & Bruce S. Rubidge
The Main Karoo Basin of South Africa contains a near-continuous sequence of continental deposition spanning 45 million years from the middle Permian to the Early Jurassic. The terrestrial vertebrates of this sequence provide a high-resolution stratigraphic record of regional origination and extinction, especially for the middle–late Permian. Until now, data have only been surveyed at coarse stratigraphic resolution using methods that are biased by non-uniform sampling rates, limiting our understanding of the dynamics of diversification...

Data from: Accounting for differences in species frequency distributions when calculating beta diversity in the fossil record

Neil Brocklehurst, Michael O. Day & Jörg Fröbisch
1. Beta diversity is a measure of the taxonomic differentiation between habitats/localities within an assemblage, and is normally calculated as a set of pairwise taxonomic “distances” between the localities. 2. Due to the incomplete sampling, beta diversity estimates for fossil assemblages will always be higher than the true value. However, the difference between the observed and true distances will vary greatly depending on differences in the shape of the relative abundance distribution. 3. Using simulations,...

Data from: Dental ontogeny in extinct synapsids reveals a complex evolutionary history of the mammalian tooth attachment system

Aaron R.H. LeBlanc, Kirstin S. Brink, Megan R. Whitney, Fernando Abdala, Robert R. Reisz & Aaron R. H. LeBlanc
The mammalian dentition is uniquely characterized by a combination of precise occlusion, permanent adult teeth, and a unique tooth attachment system. Unlike the ankylosed teeth in most reptiles, mammal teeth are supported by a ligamentous tissue that suspends each tooth in its socket, providing flexible and compliant tooth attachment that prolongs the life of each tooth and maintains occlusal relationships. Here we investigate dental ontogeny through histological examination of a wide range of extinct synapsid...

Data from: Topographic mapping of the interfaces between human and aquatic mosquito habitats to enable barrier-targeting of interventions against malaria vectors

Victoria M. Mwakalinga, Benn K.D. Sartorius, Alex J. Limwagu, Yeromin P. Mlacha, Daniel F. Msellemu, Prosper P. Chaki, Nicoderm J. Govella, Maureen Coetzee, Stefan Dongus, Gerry F. Killeen, Nicodem J. Govella & Benn K. D. Sartorius
Geophysical topographic metrics of local water-accumulation potential are freely available and have long been known as high resolution predictors of where aquatic habitats for immature Anopheles mosquitoes are most abundant, resulting in elevated densities of adult malaria vectors and human infection burden. Using existing entomological and epidemiological survey data, here we illustrate how topography can also be used to map out the interfaces between wet, unoccupied valleys and dry, densely populated uplands, where malaria vector...

Data from: Ontogeny of the Massospondylus labyrinth: implications for locomotory shifts in a basal sauropodomorph dinosaur

James M. Neenan, Kimberley E. J. Chapelle, Vincent Fernandez & Jonah N. Choiniere
Ontogeny is a vital aspect of life history sometimes overlooked in palaeontological studies. However, the changing geometry of anatomical structures during growth can be informative regarding ecological and functional reconstructions. The inner ear, or labyrinth, is an ideal ontogenetic study system because it has a strong functional signal in its morphology that is linked to locomotor mode. Yet almost nothing is known about labyrinth development in dinosaurs. We quantified labyrinth scale and geometry through ontogeny...

Data from: Unravelling the history of hepatitis B virus genotypes A and D infection using a full-genome phylogenetic and phylogeographic approach

Evangelia-Georgia Kostaki, Timokratis Karamitros, Garyfallia Stefanou, Ioannis Mamais, Konstantinos Angelis, Angelos Hatzakis, Anna Kramvis & Dimitrios Paraskevis
Hepatitis B virus (HBV) infection constitutes a global public health problem. In order to establish how HBV was disseminated across different geographic regions, we estimated the levels of regional clustering for genotypes D and A. We used 916 HBV-D and 493 HBV-A full-length sequences to reconstruct their global phylogeny. Phylogeographic analysis was conducted by reconstruction of ancestral states using the criterion of parsimony. The putative origin of genotype D was in North Africa/Middle East. HBV-D...

Data from: Diversity and abundance of macro‐invertebrates on abandoned cattle kraals in a semi‐arid savanna

Justice Muvengwi, Gift Chikorowondo, Monicah Mbiba & Edson Gandiwa
Abandoned cattle (Bos taurus) kraals are sources of habitat heterogeneity in dystrophic semi‐arid African savannas with a strong positive effect on soil nutrients and plant productivity. However, little is known regarding how macro‐invertebrate assemblages vary between abandoned kraals and the surrounding savanna matrix. We tested whether herbaceous biomass and basal and aerial covers and soil nutrients have an effect on aboveground and belowground macro‐invertebrate assemblages. Twelve abandoned kraals were contrasted with their paired control plots...

Registration Year

  • 2018
    9

Resource Types

  • Dataset
    9

Affiliations

  • University of the Witwatersrand
    9
  • University of Oxford
    2
  • Chinhoyi University of Technology
    1
  • University of Washington
    1
  • University of Alberta
    1
  • Humboldt University of Berlin
    1
  • University of Cyprus
    1
  • University of Toronto
    1
  • University of British Columbia
    1
  • Bindura University of Science Education
    1