Quantitative Zoology

Schultz, Vincent; Simpson, George Gaylord; Roe, Anne; Lewontin, Richard C

doi:10.2307/1292664

Cited by 8 publications

(8 citation statements)

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“…Calculated univariate statistics, including coefficients of variation, are shown in Online Supplementary Material Table 3; these results are calculated from the measurements of upper (Online Supplementary Material Table 4) and lower (Online Supplementary Material Table 5) dentition of extant bandicoots. Coefficient of variation of dental dimensions for Bulungu palara generally fall within expected levels (4-10; Simpson et al 1960) for a single, mixed- sex, normally-distributed population (Online Supplementary Material Table 3), except for p3 (CV = 12.79) and P3 (CV = 15.73) width and M4 (CV = 11.67) length. This is consistent with results from modern bandicoot species, where coefficients of variation for p3, P3 and M4 are also in many cases higher than 10.…”

Section: Morphotype Analysismentioning

confidence: 51%

Biogeographical implications of a new mouse-sized fossil bandicoot (Marsupialia: Peramelemorphia) occupying a dasyurid-like ecological niche across Australia

Gurovich

Travouillon

Beck

et al. 2013

Journal of Systematic Palaeontology

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This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.

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Section: Morphotype Analysismentioning

confidence: 51%

Biogeographical implications of a new mouse-sized fossil bandicoot (Marsupialia: Peramelemorphia) occupying a dasyurid-like ecological niche across Australia

Gurovich

Travouillon

Beck

et al. 2013

Journal of Systematic Palaeontology

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“…The bivariate coefficients of allometry were interpreted as growth rates of a specific cranial variable, although they actually represent rates of size increase (Simpson et al 1960;Gould 1966;Nelson 1978;Cassini et al 2012). Thus, it was ultimately assumed that intraspecific allometry of size closely reflects true allometry of growth.…”

Section: Figmentioning

confidence: 99%

Skull allometry and sexual dimorphism in the ontogeny of the southern elephant seal (Miroungaleonina)

2014

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The southern elephant seal (Mirounga leonina (L., 1758)) is one of the most dimorphic mammals, but sexual dimorphism in its skull ontogeny is poorly known. We study ontogeny of sexual dimorphism by the allometric relationships between 21 measurements and its geometric mean. Based on 66 specimens (36 females, 30 males), the bivariate and multivariate analyses indicated that both approaches were congruent in most variables. We detected that sexual dimorphism was reached mostly by sexual shape differences in the ontogenetic trajectories of males and females. Twenty-four percent of variables were associated with intercept differences (pup size proportions), while 57% of variables were associated with slope intersexual differences (relative growth rates). Contrarily, sexual dimorphism was also achieved by size differences in adult stages (19% of variables), as males exhibited an extension of their common ontogenetic trajectories. Secondary growth spurt in males was detected for few variables. Our comparison with analogous data collected from southern sea lions (Otaria byronia (de Blainville, 1820)) indicated that in both species, sexual dimorphism was mostly associated with an enhanced ability to defend territories, which was linked to the polygynic behavior. However, discrepancies between both ontogenetic patterns of dimorphism were associated with interspecific differences in their life cycles.

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“…All analyses were conducted using the species' average for TLV and HV. To linearize scaling relationships (Simpson et al, 2003), the cube‐root of TLV and HV were calculated then converted to natural logarithmic units (base e ). To accommodate the potential influence of phylogeny, Phylogenetic Generalized Least Squares (PGLS) regression used a consensus anthropoid tree modified from Version 3 of 10 K Trees (Arnold et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

Updated imaging and phylogenetic comparative methods reassess relative temporal lobe size in anthropoids and modern humans

Pearson

Bruner

Polly

2023

American Journal of Biological Anthropology

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Objectives Two decades ago, Rilling and Seligman, hereafter abbreviated to RAS Study, suggested modern humans had relatively larger temporal lobes for brain size compared to other anthropoids. Despite many subsequent studies drawing conclusions about the evolutionary implications for the emergence of unique cerebral specializations in Homo sapiens, no re‐assessment has occurred using updated methodologies. Methods We reassessed the association between right temporal lobe volume (TLV) and right hemisphere volume (HV) in the anthropoid brain. In a sample compiled de novo by us, T1‐weighted in vivo Magnetic Resonance Imaging (MRI) scans of 11 extant anthropoid species were calculated by‐voxel from the MRI and the raw data from RAS Study directly compared to our sample. Phylogenetic Generalized Least‐Squares (PGLS) regression and trait‐mapping using Blomberg's K (kappa) tested the correlation between HV and TLV accounting for anthropoid phylogeny, while bootstrapped PGLS regressions tested difference in slopes and intercepts between monkey and ape subsamples. Results PGLS regressions indicated statistically significant correlations (r2 < 0.99; p ≤ 0.0001) between TLV and HV with moderate influence from phylogeny (K ≤ 0.42). Bootstrapped PGLS regression did not show statistically significant differences in slopes between monkeys and apes but did for intercepts. In our sample, human TLV was not larger than expected for anthropoids. Discussion Updated imaging, increased sample size and advanced statistical analyses did not find statistically significant results that modern humans possessed a disproportionately large temporal lobe volume compared to the general anthropoid trend. This has important implications for human and non‐human primate brain evolution.

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Quantitative Zoology

Cited by 8 publications

References 0 publications

Biogeographical implications of a new mouse-sized fossil bandicoot (Marsupialia: Peramelemorphia) occupying a dasyurid-like ecological niche across Australia

Biogeographical implications of a new mouse-sized fossil bandicoot (Marsupialia: Peramelemorphia) occupying a dasyurid-like ecological niche across Australia

Skull allometry and sexual dimorphism in the ontogeny of the southern elephant seal (Miroungaleonina)

Updated imaging and phylogenetic comparative methods reassess relative temporal lobe size in anthropoids and modern humans

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