7 Works

Patterns of fluctuating asymmetry in the limbs of freshwater turtles: are more functionally important limbs more symmetrical?

Gabriel Rivera & Cally Monie Deppen Neely
Understanding how selective forces influence patterns of symmetry remains an active area of research in evolutionary biology. One hypothesis, which has received relatively little attention, suggests that the functional importance of morphological characters may influence patterns of symmetry. Specifically, it posits that for structures that display bilateral symmetry, those with greater functional importance should display lower levels of asymmetry. The aim of this study was to examine the patterns of fluctuating asymmetry (FA) present in...

Data from: Repeated evolution of tricellular (and bicellular) pollen

Joseph H. Williams, Mackenzie L. Taylor & Brian C. O'Meara
Premise of study: Male gametophytes of seed plants are sexually immature at the time they are dispersed as pollen, but approximately 30% of flowering plants have tricellular pollen containing fully formed sperm at anthesis. The classic study of Brewbaker (1967: American Journal of Botany 54: 1069–1083) provided a powerful confirmation of the long-standing hypothesis that tricellular pollen had many parallel and irreversible origins within angiosperms. We readdressed the main questions of that study with modern...

Data from: The effects of skeletal asymmetry on interpreting biological variation and taphonomy in the fossil record

Brandon P. Hedrick, Emma R. Schachner, Gabriel Rivera, Peter Dodson & Stephanie E. Pierce
Biological asymmetry is present in all bilaterally symmetric organisms as a result of normal developmental instability. However, fossilized organisms, which have undergone distortion due to burial, may have additional asymmetry as a result of taphonomic processes. To investigate this issue, we evaluated the magnitude of shape variation resulting from taphonomy on vertebrate bone using a novel application of fluctuating asymmetry. We quantified the amount of total variance attributed to asymmetry in a taphonomically distorted fossil...

Data from: One foot out the door: limb function during swimming in terrestrial versus aquatic turtles

Vanessa K. Young, Kaitlyn G. Vest, Angela R.V. Rivera, Nora R. Espinoza, Richard W. Blob, Vanessa K Hilliard Young & Angela R. V. Rivera
Specialization for a new habitat often entails a cost to performance in the ancestral habitat. Although aquatic lifestyles are ancestral among extant cryptodiran turtles, multiple lineages, including tortoises (Testudinidae) and emydid box turtles (genus Terrapene), independently specialized for terrestrial habitats. To what extent is swimming function retained in such lineages despite terrestrial specialization? Because tortoises diverged from other turtles over 50 Ma, but box turtles did so only 5 Ma, we hypothesized that swimming kinematics...

Data from: Hindlimb muscle function in turtles: is novel skeletal design correlated with novel muscle function?

Christopher J. Mayerl, Jenna E. Pruett, Morgan N. Summerlin, Angela R. V. Rivera & Richard W. Blob
Variations in musculoskeletal lever systems have formed an important foundation for predictions about the diversity of muscle function and organismal performance. Changes in the structure of lever systems may be coupled with changes in muscle use and give rise to novel muscle functions. The two extant turtle lineages, cryptodires and pleurodires, exhibit differences in hindlimb structure. Cryptodires possess the ancestral musculoskeletal morphology, with most hip muscles originating on the pelvic girdle, which is not fused...

Data from: Expanding the described metabolome of the marine cyanobacterium Moorea producens JHB through orthogonal natural products workflows

Paul D. Boudreau, Emily A. Monroe, Suneet Mehrotra, Shane Desfor, Anton Korobeynikov, David H. Sherman, Thomas F. Murray, Lena Gerwick, Pieter C. Dorrestein & William H. Gerwick
Moorea producens JHB, a Jamaican strain of tropical filamentous marine cyanobacteria, has been extensively studied by traditional natural products techniques. These previous bioassay and structure guided isolations led to the discovery of two exciting classes of natural products, hectochlorin (1) and jamaicamides A (2) and B (3). In the current study, mass spectrometry-based ‘molecular networking’ was used to visualize the metabolome of Moorea producens JHB, and both guided and enhanced the isolation workflow, revealing additional...

Data from: Immunoglobulin detection in wild birds: effectiveness of three secondary anti-avian IgY antibodies in direct ELISAs in 41 avian species

Carol A. Fassbinder-Orth, Travis E. Wilcoxen, Tiffany Tran, Raoul K. Boughton, Jeanne M. Fair, Erik K. Hofmeister, Jennifer L. Grindstaff & Jen C. Owen
1.Immunological reagents for wild, non-model species are limited or often non-existent for many species. 2. In this study, we compare the reactivity of a new anti-passerine IgY secondary antibody with existing secondary antibodies developed for use with birds. Samples from 41 species from the following six avian orders were analysed: Anseriformes (1 family, 1 species), Columbiformes (1 family, 2 species), Galliformes (1 family, 1 species), Passeriformes (16 families, 34 species), Piciformes (1 family, 2 species)...

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  • Creighton University
  • Clemson University
  • University of Pennsylvania
  • University of Michigan-Ann Arbor
  • William Paterson University
  • Millikin University
  • University of California, San Diego
  • Los Alamos National Laboratory
  • Oklahoma State University
  • University of Tennessee at Knoxville