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Deciphering the Palimpsest: Studying the Relationship Between Morphological Integration and Phenotypic Covariation
It is argued that the direct study of the developmental determinants of integration in model systems is necessary to fully interpret patterns of covariation in natural populations, to link covariation patterns to the processes that generate them, and to understand their significance for evolutionary explanation.
Locomotor anatomy and biomechanics of the Dmanisi hominins.
Integration and Evolvability in Primate Hands and Feet
- C. Rolian
- BiologyEvolutionary Biology
- 17 March 2009
Results indicate that integration decreases as hands and feet become functionally divergent, and that the strongly integrated hand and foot skeletons of quadrupedal monkeys respond to selection in a highly collinear manner, even when simulated selective pressures acting on each autopod are in opposite directions in phenotypic space.
Hand biomechanics during simulated stone tool use.
Walking, running and the evolution of short toes in humans
- C. Rolian, D. Lieberman, J. Hamill, John W. Scott, William Werbel
- BiologyJournal of Experimental Biology
- 1 March 2009
A biomechanical model of toe function in bipedal locomotion is proposed that suggests that shorter pedal phalanges improve locomotor performance by decreasing digital flexor force production and mechanical work, which might ultimately reduce the metabolic cost of flexorforce production during bipedAL locomotion.
The generation of variation and the developmental basis for evolutionary novelty.
- B. Hallgrímsson, H. Jamniczky, Nathan M Young, C. Rolian, U. Schmidt-Ott, R. Marcucio
- BiologyJournal of experimental zoology. Part B…
- 1 September 2012
It is proposed that for a feature to be novel, it must have evolved both by a transition between adaptive peaks on the fitness landscape and that this transition must have overcome a previous developmental constraint.
The coevolution of human hands and feet.
- C. Rolian, D. Lieberman, B. Hallgrímsson
- Biology, PsychologyEvolution; international journal of organic…
- 1 June 2010
The data support the hypothesis that human hands and feet coevolved, and suggest that the evolution of long robust big toes and short lateral toes for bipedalism led to changes in hominin fingers that may have facilitated the emergence of stone tool technology.
Reassessing manual proportions in Australopithecus afarensis.
A resampling approach that includes the entire assemblage of complete hand elements at Hadar, and takes into account uncertainties in identifying phalanges by individual, side and digit number provides the most conservative estimates of manual proportions in Au.
An assessment of orofacial clefts in Tanzania
Unilateral orofacial clefts were significantly more common than bilateral clefts; with the left side being the most common affected side; and a departure from the pattern of clefting reported for Caucasian and Asian populations.
Genes, development, and evolvability in primate evolution
- C. Rolian
- BiologyEvolutionary anthropology
- 6 May 2014
Together with phenomena such as genetic drift, organismal development determines the raw material available to selection and thus influences the rate and direction of phenotypic evolution.