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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 63 for “"Allometry"”.
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The allometry of bird flight performance
… and total aerodynamic power scaled with negative allometry, but were significantly influenced by foraging ecology. Species that forage on the ground had relatively lower jump impulses, shorter wings, higher wingbeat frequencies, and higher power output than species that forage on elevated …
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The allometry of bird flight performance
… and total aerodynamic power scaled with negative allometry, but were significantly influenced by foraging ecology. Species that forage on the ground had relatively lower jump impulses, shorter wings, higher wingbeat frequencies, and higher power output than species that forage on elevated …
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The Allometry of Giant Flightless Birds
Despite our intuition, birds are no smaller than mammals when the constraints of a flying body plan are taken into account. Nevertheless, the largest mammals are ten times the mass of the largest birds. Allometric equations generated for anseriforms and ratites suggest mid-shaft femur circumference …
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Multivariate asymmetry and allometry in human limb bones as a basis for osteometric sorting
… bone measurements with multivariate analyses of allometry and asymmetry. Previous research on osteometric sorting are univariate in nature and often make fallacious assumptions of perfect symmetry in long bones. These methods have led to issues of specious statistical assumptions and high error …
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LIFE HISTORY SWITCH POINT PLASTICY IN RESPONSE TO POND DRYING ALYERS METAMORPH ALLOMETRY AND JUMPING PERFORMANCE
Animals with complex life cycles can cope with environmental uncertainty by altering life history switch points through developmental plasticity. Pond drying is an important factor which may alter life history switch points in aquatic organisms. Many amphibians can plastically respond to changes in …
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How environments shape ornament morphological evolution: bringing perspective to a century of inconsistent sexual allometry analysis
… functions. However, this analysis (i.e., allometry) often produces inconsistent outcomes that undermine its effectiveness. To this end, I investigated whether different sexual structures always evolve similar allometric patterns, and how the environment might prevent this from happening. …
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Patterns of variation and allometry in sub-cortical structures of the human brain: an evaluation of sex differences and age
… results indicate two possible patterns of allometry: significant positive allometry with the use of a reduced major axis regression, or allometry supporting a generally isometric to negatively allometric with the use of an ordinary least squares regression. Both results are described. …
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The allometry of territory size and metabolic rate as predictors of self-thinning in young-of-the-year Atlantic salmon (Salmo salar)
… density for a given body size is set by the allometry of territory size. The energetic equivalence hypothesis suggests that if there is a constant amount of energy flowing through a population, the self-thinning slope is set by the allometry of metabolic rate. I tested the predictions of both …
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LINKING ALLOMETRIC SCALING THEORY WITH LIDAR REMOTE SENSING FOR IMPROVED BIOMASS ESTIMATION AND ECOSYSTEM CHARACTERIZATION
… controversial theoretical predictions of forest allometry through the mapping of the allometric variability using field plots across the U.S. we find that there is considerable variability in forest allometry across space, largely driven by local environment and life history. However, in tall …
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Fruit-based allometry of Strychnos madagascariensis, S. spinosa, and Trichilia emetica in the savanna woodlands of the Umhlabuyalingana municipality, KwaZulu-Natal, South Africa
Savannah woodlands of South Africa are endowed with a high diversity of fruit tree species among of which are Strychnos madagascariensis, S. spinosa, and Trichilia emetica, which have a potential for commercial harvest from the wild. Assessment of the profitability of harvesting their fruits and as …
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The Meaning and Measurement of Reproductive Effort in Plants With Specific Reference to Agropyron Repens (Resource Allocation, Currency of Allocation, Allometry, Growth Analysis)
Reproductive effort, or the proportion of an organism's resources allocated to reproduction is a crucial aspect of an organism's life history and the optimal allocation of resources to reproduction in different environments has been the subject of much theorizing. Adequate tests of these theories …
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The relationship between stem-form, stand-closure and site -conditions : the influence of environmental conditions on tree allometry and forest structure in west-central Alberta
… of that volume that is merchantable timber. Tree allometry, as represented by stem-fo~, is the result of the vertical force of gravity and the horizontal force of wind. The effect of wind force is demonstrated in the relationship between stem-form, standclosure and site-conditions. An increase in …
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A Contravention of Established Principles of Interspecific Allometric Metabolic Scaling in Developing Silkworms, Bombyx Mori.
… all instars the slope was 0.82. Developmental allometry should be presented for individual developmental stages because the individual allometric exponents of the stages can be significantly different from the overall allometric exponent throughout development and in some cases, the overall …
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Modelling the structuring of animal communities in heterogeneous landscapes : the role of individual home range formation, foraging movement, competition and habitat configuration
… of animal communities. Therefore, an allometry- and individual-based model has been developed which was used to simulate mammal and bird communities in heterogeneous landscapes, and to to better understand their response to landscape changes (habitat loss and fragmentation).
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Multiple axes of inter-organ signaling regulate organ scaling
The mechanisms governing static allometry of organ size has long been enigmatic. A central hypothesis predicts that during animal growth, body size is perceived by organs via inter-organ signals, which directs organ growth to match body size. Ligands of the Transforming Growth Factor β (TGFβ) …
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Big Brains and Small Teeth: a primate comparative approach to dental and mandibular reduction in hominins
… The effect of diet and structural constraints (allometry and encephalization) on dental and mandibular size and robusticity were analysed. The results show that incisor size and mandibular robusticity correlate significantly with diet proxies in non-human extant catarrhines and with neurocranium …
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Elucidating the Relationships Between Spider Size, Joint Stiffness, and the Mechanical Frequency Response of the Body
… whole body. To study joints, I quantified the allometry of leg joint stiffness in spiders. I found that the stiffness of spider joints increased nearly isometrically with increasing body mass, partly by having shorter and thicker leg segments and also by other unknown means. Using these data, I …
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What’s in a Tooth? Signals of Ecogeography and Phylogeny in the Dentition of Macaques (Cercopithecidae: Macaca)
… Patterns of variation, covariation, and allometry were analysed in the dentition, both within and between species. The ecogeographical analysis was carried out by means of two-block partial least squares and a type of multivariate regression, both in a phylogenetic framework. Phylogenetic …
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Changes in morphology during the development of the horn and hump of the Chinese cavefish sinocyclocheillus furcodorsalis
… scans of seven fish were examined and positive allometry results exist for skull length relative to the neural spine length. However, other features refuted the hypothesis that heterochrony underlies hump and horn development in S. furcodorsalis.
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On The Cranial Osteology of <em>Eremiascincus</em> and Its Use For Identification.
… 3) a description of the cranial allometry in <em>Eremiascincus</em> using linear morphometrics, 4) using cranial morphometrics of skinks to deduce their phylogeny, and 5) using geometric morphometrics to distinguish between individual elements of <em>Eremiascincus</em> and …
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