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 73 for “"geographic variation"”.
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Geographic variation and natural selection in Eumeces obsoletus (Reptilia: Sauria: Scincidae)
Thesis (M.A.)--University of Kansas, Department of Systematics and Ecology, 1975.
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Geographic Variation in the Bioenergetics of the House Sparrow, Passer Domesticus
Made available in DSpace on 2014-12-10T18:13:42Z (GMT). No. of bitstreams: 1 7013246.pdf: 2048400 bytes, checksum: 0454c9168b6ed7719dd513b1448dd0db (MD5) Previous issue date: 1969
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Geographic Variation in the Morphology of <i>Crotalus horridus</i> (Serpentes: Viperidae)
… western), but conflicting data sets and limited geographic sampling of previous studies have left the relationships among those regional variants unclear. In this study, univariate and multivariate statistics, together with a geographic information system, were used to analyze geographic …
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Geographic Variation in Dicamptodon Ensatus (Eschscholtz) with Notes on Life History and Zoogeography
… this paper is to present information concerning geographic variation between three northern populations of Dicamptodon, and to add to the meager store of information concerning the life history and biology of the species.
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Geographic variation in the phenotypes of two sibling horseshoe bats Rhinolophus simulator and R.swinnyi
The study of geographic variation and its causes in the phenotypes of animals elucidates how evolutionary processes generate biodiversity. This thesis attempts to uncouple the relative contributions of adaptive and neutral mechanisms to population divergence in African horseshoe bats (genus …
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Examining geographic variation in children's perceived barriers to physical activity and the implications on behaviour
… quantitative protocol, this thesis examines geographic variation in socio-ecological factors influencing children’s perceptions of barriers to PA, and the extent to which perceptions mediate the relationship of the environment and PA. Results indicate that perceptions form within contexts, …
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Geographic variation in the phenotype of an African horseshoe bat species, Rhinolophus damarensis, (Chiroptera: Rhinolophidae)
Studies involving geographic variation in the phenotypes of bats help scientists to explain why these mammals are the most species rich mammalian order second only to rodents, with well more than 1 300 species occurring worldwide. Such species richness or high diversity is the manifestation of the …
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Geographic variation in the echolocation calls of the endemic Cape horseshoe bat, Rhinolophus capensis (Chiroptera: Rhinolophidae)
… levels. No previous study has investigated geographic variation in echolocation calls of R. capensis. Body size, wing morphology and skull parameters associated with diet and echolocation call production and reception, were compared between populations. Adult R. capensis were sampled at …
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Vocalization Behavior of the Endangered Bahama Oriole (Icterus northropi): Ontogenetic, Sexual, Temporal, Duetting Pair, and Geographic Variation
… differ between sexes, and vary temporally and geographically. In New World orioles, most tropical species exhibit the ancestral states of sexual monochromatism (both sexes have similar plumage) and monovocalism (both sexes sing and often duet together), whereas migratory temperate species tend …
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Geographic variation of song within and between subspecies of the Mangrove Warbler (Setophaga petechia castaneiceps and S. p. rhizophorae)
… not identical among con-specific individuals and variations may occur at different geographic scales throughout a species distribution. Geographic song variation is common in many species, particularly in Passerines due to their song-learning behavior. Among Wood Warblers (Fam. Paruliade), The …
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Subspecific and Geographic Variation in Life-History Characteristics in Two Subspecies of Painted Turtle, Chrysemys Picta Bellii and Chrysemys Picta Dorsalis
… subspecies of Chrysemys picta to determine if variation in these traits is mainly influenced by geography (i.e. latitude and elevatoin) or if they vary subspecifically. Specimens of C. p. bellii and C. p. dorsalis were collected from the same latitude and elevation in southern Missouri. Male …
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Assessment of the magnitude of geographic variation and socioeconomic contextual effects on children’s dental caries: a multilevel cross-sectional analysis of a population-based sample
Background: Revealing geographic variation and assessing area contextual influences are important for reducing social inequalities in dental caries. The objective of this study was to investigate area contextual effects on children’s dental caries. Methods: This cross-sectional study included data …
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Linking environmental variation across the Scottish Highlands with red deer (Cervus elaphus) trace element status, parasite burden, and skeletal morphometry
… the population have extensively quantified geographic variation in parasite prevalence or nutritional essential and non-essential trace/macro and toxic element status. Given the well-recognised effects of sub-lethal parasitism and sub-optimal nutrition on performance of ruminants (from an …
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Variation in Computerized Tomography Scan Utilization
… of care. No studies are conducted on investigate geographic variation on CT scan usage rate. This research is the first one to examine CT scan usage rate among counties and to examine variation caused by patient and hospital characteristics. We used the 2007 HCUP-SID database provided data for the …
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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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Morphological Variation of the Genus Peromyscus in Nebraska
… lies in the large number of species and the geographic variation within most species. Peromyscus does, indeed, encompass a large number of species. In 1964, Hooper and Musser suggested some modifications of the current classification to include 13 species-groups. Within these 13 groups, they …
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