8 Works

Data from: Ontogeny of the middle-ear air-sinus system in Alligator mississippiensis (Archosauria: Crocodylia)

David L. Dufeau & Lawrence M. Witmer
Modern crocodylians, including Alligator mississippiensis, have a greatly elaborated system of pneumatic sinuses invading the cranium. These sinuses invade nearly all the bones of the chondrocranium and several bony elements of the splanchnocranium, but patterns of postnatal paratympanic sinus development are poorly understood and documented. Much of crocodylomorph—indeed archosaurian—evolution is characterized by the evolution of various paratympanic air sinuses, the homologies of which are poorly understood due in large part to the fact that individual...

Data from: Identification of the notothenioid sister lineage illuminates the biogeographic history of an Antarctic adaptive radiation

Thomas J. Near, Alex Dornburg, Richard C. Harrington, Claudio Oliveira, Theodore W. Pietsch, Christine E. Thacker, Takashi P. Satoh, Eri Katayama, Peter C. Wainwright, Joseph T. Eastman & Jeremy M. Beaulieu
Background: Antarctic notothenioids are an impressive adaptive radiation. While they share recent common ancestry with several species-depauperate lineages that exhibit a relictual distribution in areas peripheral to the Southern Ocean, an understanding of their evolutionary origins and biogeographic history is limited as the sister lineage of notothenioids remains unidentified. The phylogenetic placement of notothenioids among major lineages of perciform fishes, which include sculpins, rockfishes, sticklebacks, eelpouts, scorpionfishes, perches, groupers and soapfishes, remains unresolved. We investigate...

Data from: Spatiotemporal analysis of gene flow in Chesapeake Bay Diamondback Terrapins (Malaclemys terrapin)

Paul E. Converse, Shawn R. Kuchta, Willem M. Roosenburg, Paula F.P. Henry, Tim L. King, G. Michael Haramis & Paula F. P. Henry
There is widespread concern regarding the impacts of anthropogenic activities on connectivity among populations of plants and animals, and understanding how contemporary and historical processes shape metapopulation dynamics is crucial for setting appropriate conservation targets. We used genetic data to identify population clusters and quantify gene flow over historical and contemporary time frames in the Diamondback Terrapin (Malaclemys terrapin). This species has a long and complicated history with humans, including commercial over-harvesting and subsequent translocation...

Data from: Conquering the world in leaps and bounds: hopping locomotion in toads is actually bounding

Stephen M. Reilly, Stephane J. Montuelle, Andre Schmidt, Emily Naylor, Michael E. Jorgensen, Lewis G. Halsey, & Richard L. Essner
1.While most frogs maximize jump distance as an escape behavior, toads have traded jump distance for endurance with a strategy of hopping repeatedly. This strategy has enabled toads to expand across the continents as one of the most diverse groups of anurans. Multiple studies have revealed physiological endurance adaptations for sustained hopping in toads, however, the kinematics of their sequential hopping behavior, per se, has not been studied. 2.We compared kinematics and forces of single...

Data from: A new titanosaurian braincase from the Cretaceous “Lo Hueco” locality in Spain sheds light on neuroanatomical evolution within Titanosauria

Fabien Knoll, Lawrence M. Witmer, Ryan C. Ridgely, Francisco Ortega & Jose Luis Sanz
Despite continuous improvements, our knowledge of the neurocranial anatomy of sauropod dinosaurs as a whole is still poor, which is especially true for titanosaurians even though their postcranial remains are common in many Upper Cretaceous sites worldwide. Here we describe a braincase from the uppermost Cretaceous locality of ‘‘Lo Hueco” in Spain that is one of the most complete titanosaurian braincases found so far in Europe. Although the titanosaurian Ampelosaurus sp. is known from the...

Data from: The evolution of sexually dimorphic tail feathers is not associated with tail skeleton dimorphism

Ryan N. Felice & Patrick M. O'Connor
Sexual selection can influence the evolution of sexually dimorphic exaggerated display structures. Herein, we explore whether such costly ornamental integumentary structures evolve independently or if they are correlated with phenotypic change in the associated skeletal system. In birds, elongate tail feathers have frequently evolved in males and are beneficial as intraspecific display structures but impart a locomotor/energetic cost. Using the sexually dimorphic tail feathers of several passeriform species as a model system, we test the...

Data from: Vascular patterns in iguanas and other squamates: blood vessels and sites of thermal exchange

William Ruger Porter & Lawrence M. Witmer
Squamates use the circulatory system to regulate body and head temperatures during both heating and cooling. The flexibility of this system, which possibly exceeds that of endotherms, offers a number of physiological mechanisms to gain or retain heat (e.g., increase peripheral blood flow and heart rate, cooling the head to prolong basking time for the body) as well as to shed heat (modulate peripheral blood flow, expose sites of thermal exchange). Squamates also have the...

Data from: Climate and habitat interacts to shape the thermal reaction norms of breeding phenology across lizard populations

Alexis Rutschmann, Donald B. Miles, Jean-François Le Galliard, Murielle Richard, Sylvain Moulhérat, Barry Sinervo & Jean Clobert
1. Substantial plastic variation in phenology in response to environmental heterogeneity through time in the same population has been uncovered in many species. However, our understanding of differences in reaction norms of phenology among populations from a given species remains limited. 2. Since the plasticity of phenological traits is often influenced by local thermal conditions, we expect local temperature to generate variation in the reaction norms between populations. 3. Here, we explored temporal variation in...

Registration Year

  • 2015
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Resource Types

  • Dataset
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Affiliations

  • Ohio University
    8
  • Sao Paulo State University
    1
  • Natural History Museum of Los Angeles County
    1
  • Burke Museum of Natural History and Culture
    1
  • Autonomous University of Madrid
    1
  • University of Manchester
    1
  • French National Centre for Scientific Research
    1
  • University College London
    1
  • National University of Distance Education
    1
  • Museo Nacional de Ciencias Naturales
    1