Browsing Biology by Title
Now showing items 140-159 of 207
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The Paleobiology of South African Therocephalian Therapsids (Amniota, Synapsida) and the Effects of the End-Permian Extinction on Size, Growth, and Bone Microstructure
(2013-11-14)Despite their relative diversity in terrestrial Permian and Triassic rocks, the fossil record of therocephalian therapsids (Eutheriodontia) and their utility for understanding evolutionary patterns in the therapsid forerunners ... -
Past and present: what museum specimens and detection dogs bring to pangolin conservation
Pangolins, a group of scaly anteaters, have recently garnered the attention of both the public and scientific community by the magnitude of trade in their meat and scales. Despite the large volume of legal and illegal trade ... -
Pattern and process in primary succession in high elevation habitats on Mount St. Helens
(1987)The mechanistic basis of primary succession remains poorly known. The facilitation model, thought to describe primary succession, stresses the environmental modifications caused by early colonists as important in promoting ... -
Persistence under pressure: exploring the impact of conjugation rate evolution on the stability of plasmids
Plasmids are small, extrachromosomal DNA elements commonly found in bacteria, often carrying accessory genes such as antibiotic resistance genes. They play a pivotal role in disseminating antibiotic resistance within ... -
Phenotypic plasticity in the red alga Porphyra abbottae: environmental factors influencing light harvesting ability
(1990)Gametophytes of the red intertidal macroalga Porphyra abbottae were grown in batch cultures in order to examine some of their plastic responses to key environmental factors. Conchospores from a conchocelis stock culture ... -
Phylogeny and biogeography of Neotropical flowering plant tribe Citharexyleae (Verbenaceae)
The New World tropics, or Neotropics, located within tropical latitudes of North and South America, are one of the most diverse ecoregion in the world. However, this diversity is poorly understood in terms of described ... -
Phylogeography, population genetic structure, and reproductive biology of antelope ground squirrels
(2006)The genetic structure of populations over a wide geographic area should reflect the demographic and evolutionary processes that have shaped a species across its range. Similarly, variation in physiological traits should ... -
Physiological and behavioral responses to temperature and flow in the barnacle Balanus glandula Darwin (1854)
(2013-11-14)Given the scale and pace of anthropogenic change in marine environments, it is important to understand the manner in which organisms respond to environmental uncertainty. For many aquatic species, fundamental processes ... -
Phytoliths from modern and ancient habitats: toward a modern-based, quantitative approach to reconstruct vegetation change during the MMCO of Patagonia, Argentina
Phytolith analysis has high potential for reconstructing past vegetation with higher spatial resolution compared other high-resolution proxies, such as pollen and spores. Phytolith assemblages are used in paleoecology to ... -
PIE-1, MEX-5, MEX-6, and soma/germline asymmetry in C. elegans embryos
(2000)The separation between soma and germline in C. elegans embryos occurs through a series of asymmetric cell divisions initiating with the 1-cell stage. Each of these divisions results in one daughter that will produce only ... -
Plant-Pollinator Interactions in an Ecological and Evolutionary Context: The Promising Role of 3D-Printing Technology and Mathematical Modeling
This dissertation concerns itself with the role of flower shape in affecting the foraging performance of pollinating animals. The pollinator used in this study is a model organism representing crepuscular hawkmoths in ... -
Plants, pollinators and global change: the effects of invasion and flowering phenology on plant-pollinator interactions
(2013-11-14)Global environmental change is currently happening more rapidly than at any time known in Earth's previous history. The impacts of rapid biotic and abiotic change will affect multiple species interactions, including ... -
Polymorphism and replication of heterochromatic repeats in the DNA of Arabidopsis
(2006)The composition of the individual eukaryote's genome and its variation within a species remain poorly defined. Even for a sequenced genome such as that of the model plant Arabidopsis thaliana accession Col-0, the large ... -
Reaching for the Stars: Ecology and Skeletal Morphology of Pacific Northwest Sea Stars
Intertidal habitats exist at the interface of land and water, requiring the organisms that live there to inhabit two very different fluids, while also generating webs of interaction that span terrestrial and marine ... -
Reaping the rewards of the big data revolution in ecology
The study of ecology has been irreversibly transformed by the ongoing big data revolution. Technological advancements in data collection and a cultural shift toward data sharing mean that ecological data are more available ... -
Regulation of dendrite growth, placement, and patterning in Drosophila melanogaster class 4 dendrite arborization neurons
The directional flow of information in neurons depends on compartmentalization: dendrites receive inputs whereas axons transmit them. Axons and dendrites likewise contain structurally and functionally distinct subcompartments. ... -
Regulation of life history strategies with individuals in predictable and unpredictable environments
(1996)Animals must adjust their physiology and life histories to conform with changes in the environment. These changes can be fairly predictable, such as the changes in the season, or they can be unpredictable, such as an attack ... -
Reliable and interpretable inference of evolutionary history using Bayesian phylogenetic approaches
Phylogenetic trees are key objects for understanding evolutionary history, first used to describe relationships between groups of species. Phylogenies help us to fill out the tree of life and to describe the dynamics that ... -
Resource allocation to growth and structure: The cost of mussel attachment in a dynamic coastal environment
Specialized mechanical structures produced by organisms provide crucial fitness advantages, but the production of these materials can result in energy allocation trade-offs, affecting population and species distributions. ... -
Restoration of native plant communities: an examination of seed limitation and microsite limitation in the Garry oak ecosystem.
The Garry oak ecosystem is one of the most highly degraded ecosystems in North America due to fragmentation, development, and conversion to incompatible uses, with less than three percent of the ecosystem dominated by ...