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Papers by T. Armijo-prewitt
Proceedings of the Royal Society B: Biological Sciences, 1998
Developmental stability (the precision with which genotypes are translated into phenotypes under ... more Developmental stability (the precision with which genotypes are translated into phenotypes under physically stressful developmental conditions), is a major source of phenotypic and behavioural variation, yet researchers have largely ignored its potential role in the ontogeny of individual propensities toward human aggression and violence. In this study, we measured £uctuating asymmetry of the body and administered aggression and ¢ghting history questionnaires to 229 college students (139 female and 90 male undergraduates). Among males, but not females, £uctuating asymmetry correlated negatively and signi¢cantly with the participants' number of ¢ghts and propensity to escalate agonistic encounters to physical violence. Principal components analyses and scree tests suggested that two psychometric factors underlie observed correlations between self-report measures of aggressive tendencies. The ¢rst factor,`aggressive negative a¡ect', re£ected verbal aggression and hostility toward others, while the second factor,`selfassessed ¢ghting ability', re£ected physical violence and a tendency to win ¢ghts. The two factors correlated minimally. For both males and females, the second factor correlated with number of ¢ghts while the ¢rst factor did not. Fluctuating asymmetry did not signi¢cantly correlate with either factor for either sex, but for both sexes, psychometric intelligence (IQ) correlated positively with the ¢rst factor.
Biological Journal of the Linnean Society, 2005
... from John Hinchliff's Oregon Butterfly Atlas (via Oregon State University), Andrew B... more ... from John Hinchliff's Oregon Butterfly Atlas (via Oregon State University), Andrew Brower, Robert Pyle, Arthur Shapiro and Larry Speers. ... genetic or other sorts of differentiation between eastern and western monarchs (Brower & Boyce, 1991; Altizer, Oberhauser & Brower, 2000 ...
The Auk, 2000
We sequenced mitochondrial DNA (mtDNA) from cytochrome b (cyt b) and the control region (CR) for ... more We sequenced mitochondrial DNA (mtDNA) from cytochrome b (cyt b) and the control region (CR) for all five extant species in the genus Tragopan. We incorporated information on comparative patterns and rates of molecular evolution into phylogenetic analyses, using both a single-gene and a combined data approach. Sequence variability was distributed heterogeneously among the three domains of CR and the three codon positions of cyt b, but the two genes evolved at comparable rates, on average, and produced concordant topologies independent of the method used for phylogenetic reconstructions. Phylogenetic trees suggest that Tragopan includes two main evolutionary lineages grouping caboti-temminckii (clade A), and blythii-satyra (clade B). A shorter CR sequence from one museum sample could not consistently resolve the position of T. melanocephalus. The mtDNA phylogeny is better supported than alternative topologies inferred from morphological and behavioral traits and is compatible with a mechanism of allopatric speciation of Tragopan in two different episodes about 4 and 2 million years ago. In those periods, the vicariant events that might have fostered allopatric speciation of Tragopan are represented by landscape changes that affected the Indohimalayan region after the sudden rising of the Himalayas less then 8 million years ago, and by climatic fluctuations during the Pleistocene less than 2 million years ago.
Proceedings: Biological Sciences, 1997
SUMMARY Little is known about the genetic nature of human psychometric intelligence (IQ), but it ... more SUMMARY Little is known about the genetic nature of human psychometric intelligence (IQ), but it is widely assumed that IQ’s heritability is at loci for intelligence per se. We present evidence consistent with a hypothesis ...
Proceedings of the Royal Society B: Biological Sciences, 1998
Developmental stability (the precision with which genotypes are translated into phenotypes under ... more Developmental stability (the precision with which genotypes are translated into phenotypes under physically stressful developmental conditions), is a major source of phenotypic and behavioural variation, yet researchers have largely ignored its potential role in the ontogeny of individual propensities toward human aggression and violence. In this study, we measured £uctuating asymmetry of the body and administered aggression and ¢ghting history questionnaires to 229 college students (139 female and 90 male undergraduates). Among males, but not females, £uctuating asymmetry correlated negatively and signi¢cantly with the participants' number of ¢ghts and propensity to escalate agonistic encounters to physical violence. Principal components analyses and scree tests suggested that two psychometric factors underlie observed correlations between self-report measures of aggressive tendencies. The ¢rst factor,`aggressive negative a¡ect', re£ected verbal aggression and hostility toward others, while the second factor,`selfassessed ¢ghting ability', re£ected physical violence and a tendency to win ¢ghts. The two factors correlated minimally. For both males and females, the second factor correlated with number of ¢ghts while the ¢rst factor did not. Fluctuating asymmetry did not signi¢cantly correlate with either factor for either sex, but for both sexes, psychometric intelligence (IQ) correlated positively with the ¢rst factor.
Biological Journal of the Linnean Society, 2005
... from John Hinchliff's Oregon Butterfly Atlas (via Oregon State University), Andrew B... more ... from John Hinchliff's Oregon Butterfly Atlas (via Oregon State University), Andrew Brower, Robert Pyle, Arthur Shapiro and Larry Speers. ... genetic or other sorts of differentiation between eastern and western monarchs (Brower & Boyce, 1991; Altizer, Oberhauser & Brower, 2000 ...
The Auk, 2000
We sequenced mitochondrial DNA (mtDNA) from cytochrome b (cyt b) and the control region (CR) for ... more We sequenced mitochondrial DNA (mtDNA) from cytochrome b (cyt b) and the control region (CR) for all five extant species in the genus Tragopan. We incorporated information on comparative patterns and rates of molecular evolution into phylogenetic analyses, using both a single-gene and a combined data approach. Sequence variability was distributed heterogeneously among the three domains of CR and the three codon positions of cyt b, but the two genes evolved at comparable rates, on average, and produced concordant topologies independent of the method used for phylogenetic reconstructions. Phylogenetic trees suggest that Tragopan includes two main evolutionary lineages grouping caboti-temminckii (clade A), and blythii-satyra (clade B). A shorter CR sequence from one museum sample could not consistently resolve the position of T. melanocephalus. The mtDNA phylogeny is better supported than alternative topologies inferred from morphological and behavioral traits and is compatible with a mechanism of allopatric speciation of Tragopan in two different episodes about 4 and 2 million years ago. In those periods, the vicariant events that might have fostered allopatric speciation of Tragopan are represented by landscape changes that affected the Indohimalayan region after the sudden rising of the Himalayas less then 8 million years ago, and by climatic fluctuations during the Pleistocene less than 2 million years ago.
Proceedings: Biological Sciences, 1997
SUMMARY Little is known about the genetic nature of human psychometric intelligence (IQ), but it ... more SUMMARY Little is known about the genetic nature of human psychometric intelligence (IQ), but it is widely assumed that IQ’s heritability is at loci for intelligence per se. We present evidence consistent with a hypothesis ...