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Determination of mode of death of John Day Merycoidodontidae (Oreodontidae) by populaton age structure analysis

Creator:: Brown, Melinda Elaine
Abstract:: Volcanic activity during the Tertiary has long been held responsible for the deaths and subsequent fossilization of the vertebrate populations of the John Day region in Oregon. Oreodonts as plains or savannah dwelling ruminant herbivores, were likely to have been subject to potential exposure throughout their lifetime to volcanic debris...
Resource Type:: Masters Thesis

Blood calcium and phosphorus perturbations in rainbow trout (Salmo gairdneri) and coho salmon (Oncorhynchus kisutch) : some correlates of physiological stress

Creator:: Adams, Brett Alan
Abstract:: Changes in blood calcium and phosphorus concentrations were characterized for rainbow trout (Salmo gairdneri) and coho salmon (Oncorhynchus kisutch) following intense exercise or exposure to suspended volcanic ash or topsoil. Significant elevations in blood calcium and phosphorus accompanied exercise-induced acidemia in both S. qairdneri and O. kisutch. These elevations persisted...
Resource Type:: Masters Thesis

Seasonal thermoregulation in the dark-eyed junco (Passeriformes: Junco hyemalis)

Creator:: Swanson, David Leslie
Abstract:: Winters in north-temperate climates impose high thermogenic demands upon small birds which are met by seasonal acclimatization. This thesis investigates the extent and mechanisms of seasonal acclimatization in darkeyed juncos (Junco hyemalis) inhabiting western Oregon. Although insulation is significantly increased in winter, acclimatization is primarily metabolic. Increased metabolism is required...
Resource Type:: Dissertation

Response to Hypoxia in the staghorn sculpin, (Leptocottus armatus)

Creator:: Wagner, Sara Anne
Abstract:: Long-term subae lal survival has been anecdotally noted in the staghorn sculpin, Leptocottus armatus. In this study, I quantified this phenomenon physiologically by examining the following parameters: standard metabolic rate and indications of reduced standard metabolic rate during subaerial exposure; capacity for and mechanism(s) of oxygen consumption in air; capacity...
Resource Type:: Masters Thesis

Nasal turbinates and the evolution of mammalian endothermy

Creator:: Hillenius, Willem J.
Abstract:: Although endothermy is one of the most significant evolutionary developments in the vertebrates, its origins among extinct taxa have traditionally been difficult to determine. Endothermy is primarily an attribute of the "soft anatomy," and its key features, such as complex lungs, elevated blood oxygen carrying capacity and mitochondrial density, do...
Resource Type:: Dissertation

New insight into the morphology and physiology of Mesozoic archosaurs

Creator:: Jones, Terry D.
Abstract:: Inferences regarding the biology of extinct taxa are often founded primarily on cladistically-based phylogenetic hypotheses. However, these inferences are frequently inconsistent with the morphology and physiology of modern animals. I suggest that reference to the biology of modern animals might be a more appropriate tool to aid in the reconstruction...
Resource Type:: Dissertation

Reconstructing the paleobiology of the dinosaurs

Creator:: Geist, Nicholas R.
Abstract:: Dinosaurs represent one of the most successful evolutionary radiations of terrestrial vertebrates, with a myriad of forms that dominated the terrestrial environment for over 180 million years. Despite the fact that dinosaurs are the focus of extensive popular and scholarly investigation, relatively little is actually known of their biology. The...
Resource Type:: Dissertation

Dinosaur lung structure and ventilation of the abdominal air sacs in birds

Creator:: Sapp, Methea
Abstract:: The purpose of this study was to identify any ostelogical features which might prevent paradoxical movement (=lateral collapse) of the abdominal air sacs in birds during inhalation. A combination of 26 fresh and frozen adult bird carcasses representing 10 avian orders were procured from local sources. Dissections of each specimen...
Resource Type:: Masters Thesis

The role of the vertebral column during jumping in quadrupedal mammals

Creator:: Harty, Tyson H.
Abstract:: Little, if any, quantifications have been made on the contribution of the vertebral column during jumping in quadrupedal mammals. Previous studies of jumpers have focused on the morphological and physiological specializations of the hindlimbs. In this study, such specialization was measured during the supramaximal jumps of the Pacific jumping mouse...
Resource Type:: Dissertation

ScholarsArchive@OSU

Determination of mode of death of John Day Merycoidodontidae (Oreodontidae) by populaton age structure analysis

Blood calcium and phosphorus perturbations in rainbow trout (Salmo gairdneri) and coho salmon (Oncorhynchus kisutch) : some correlates of physiological stress

Seasonal thermoregulation in the dark-eyed junco (Passeriformes: Junco hyemalis)

Response to Hypoxia in the staghorn sculpin, (Leptocottus armatus)

Nasal turbinates and the evolution of mammalian endothermy

New insight into the morphology and physiology of Mesozoic archosaurs

Reconstructing the paleobiology of the dinosaurs

Dinosaur lung structure and ventilation of the abdominal air sacs in birds

The role of the vertebral column during jumping in quadrupedal mammals

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