Global ETD Search
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 37 for “"Interspecific Variation"”.
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The Design of Complex Weapons Systems in Scorpions: Sexual, Ontogenetic, and Interspecific Variation
<p>Scorpions possess two integrated multifunctional weapons systems. Anteriorly, they maintain a grasping system comprised of a pair of pedipalps ending in chelae that seize and manipulate prey, ward off predators, and secure mates. Posteriorly, they wield a venom delivery system consisting of a …
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The nocturnal flight calls of migratory songbirds: interspecific variation in the “zeep” complex and intraspecific variation across North America
… of the calls of closely related taxa, or variation in calls associated with age, sex, or geography. The objective of my thesis research was to investigate acoustic variation within the flight calls of songbirds to expand our understanding of these calls and their application in migration …
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No universal support for solar glare as an evolutionary driver of malar stripes in falcons
… in conjunction with species ecology, explain interspecific variation in falcon malar stripe characteristics. My results indicated that malar stripe characteristics were not positively related to solar radiation in the majority of species, with only the Peregrine Falcon showing reliable trends …
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Mechanisms Underlying Variation in Insect Chill Tolerance: The Role of Ion and Water Transport
… for recovery from chilling. Both plastic and interspecific variation in cold tolerance correlates with enhanced defense of water and ion homeostasis during cold exposure, however the mechanisms are poorly understood. Using Gryllus crickets, I generated and tested hypotheses about the …
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The Evolution of the Glenoid Region in the Hominidae: Implications for Hominid Phylogenetics
Australopithecines exhibit more interspecific variation in glenoid region morphology than Homo. Chimpanzees and the earliest hominid taxa exhibit similar glenoid region morphologies and are readily distinguishable from later australopithecines and Homo. The Ardipithecus and Australopithecus …
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The Makapansgat Hominins: A Descriptive and Comparative Morphological Study
… base with which to discuss intraspecific and interspecific variation in currently recognized taxa of South African <italic>Australopithecus<italic>. Results support previous assertions that the Makapansgat specimens share morphological similarities with both <italic>Australopithecus …
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INFLUENCE OF EMBRYONIC METABOLIC RATE AND INCUBATION TEMPERATURE ON INCUBATION LENGTH VARIATION IN NEOTROPICAL PASSERINES
Variation in embryonic developmental periods influences fitness, but causes of interspecific variation are poorly understood. Allometry, for example, does not explain variation in incubation periods among neotropical passerines. Incubation temperature can explain some variation in developmental …
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INFLUENCE OF EMBRYONIC METABOLIC RATE AND INCUBATION TEMPERATURE ON INCUBATION LENGTH VARIATION IN NEOTROPICAL PASSERINES
Variation in embryonic developmental periods influences fitness, but causes of interspecific variation are poorly understood. Allometry, for example, does not explain variation in incubation periods among neotropical passerines. Incubation temperature can explain some variation in developmental …
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Integrating Above and Belowground Components of Biodiversity across Spatial Scales: The Role of Host Plants in the Distribution of Arbuscular Mycorrhizal Fungi
… on spatial scale of sampling, driven by interspecific variation in plant root architecture, soil physical properties and AM fungal vital rates.
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Chromosomal Evolution Among North American Microtine Rodents
… There is extensive intraspecific and interspecific variation in the number and location of NOR sites. A lack of concordance between G-band homology and NOR evolution was observed. NORs were absent from the sex chromosomes. A system was introduced whereby G-banded chromosomes and …
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Interspecific wood trait variation predicts decreased carbon residence time in changing forests
… concurrent with compositional shifts. While interspecific decay variation is widely reported, the implications of forest compositional change on ecosystem-level deadwood decay and consequently, the future of a globally significant C pool have not been previously explored. 2. Leveraging a …
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Further studies with Melianthus L. : a molecular phylogeny, evolutionary patterns of diversification in the genus and pollinator syndromes
… undeniably ornithophilous. Nectar studies reveal interspecific variation in both the volume and concentration of nectar produced as well as in nectar colourition.
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From Genes to Traits and Ecosystems: Evolutionary Ecology of <i>Sphagnum</i> (Peat Moss)
… traits underlying this extended phenotype. Interspecific functional trait variation is hypothesized to promote niche differentiation through the creation and maintenance of ecological gradients along which species sort within communities. One prominent gradient relates to …
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Cross-Scale Drivers of the Reciprocal Impacts Among Freshwater Mussels, Hydrology, and Floodplains on River Biogeochemistry
… therefore, it is necessary to account for variation in watershed features and hydrologic conditions. Freshwater mussels (Family: Unionidae) provide a valuable model system for examining the influence that species have on biogeochemical cycles and resource use because they are functionally …
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Ecological Interactions Between Spiders and the Purple Pitcher Plant, <i>Sarracenia purpurea</i>
… different techniques. Spatial, temporal, and interspecific variation in spider diversity and density among these techniques was calculated. To assess the attractive and/or retentive ability of the morphological features of <em>S. purpurea</em>, a field experiment was carried out whereby …
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Effects of body size on goose behavior: lesser snow goose and Ross's goose
… highly variable among geese, both at intra- and interspecific levels. Interspecific variation in several behaviors has been attributed to differences in body size in geese: incubation constancy, tendency to maintain family units, and time spent foraging. Body size has important physiological …
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Inner ear morphology in elasmobranchs: implications for auditory capacity and ecology
… of elasmobranch inner ears, focusing on variation from both an intraspecific (ontogenetic) and interspecific perspective. Using fluorescence microscopy to examine the ultrastructure of the inner ear, two shark species (Galeorhinus galeus and Cephaloscyllium isabellum) exhibit substantial …
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Movement of fishes in a network of streams and implications for persistence
… Movement rate and abundance explained the most interspecific variation in colonization rates when compared to competing predictors (spatial distribution, body size, and family). Recovery occurred slowly and several species had not restored more than half of their pre-defaunation abundance within …
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DNA systematic studies in the genus Bromus L. (Poaceae)
… genus of over 100 diploid and polyploid species. Variation in chloroplast DNA (cpDNA) fragment pattern was examined, initially, in 15 species of subgenera Festucaria and Ceratochloa. Subsequently, cpDNA restriction site variation was examined in 38 species, using 10 enzymes and filter …
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