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- American pika -- Pacific Northwest -- Geographical distribution (1)
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Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Exploring Mitigation Options To Reduce Vehicle-Caused Mortality For The Oregon Silverspot Butterfly, Speyeria Zerene Hippolyta, Along Highway 101 At The Siuslaw National Forest, Sara B. Zielin
Environmental Science and Management Professional Master's Project Reports
The Oregon Silverspot Butterfly (OSB), Speyeria zerene hippolyta, is federally listed as "threatened." It historically inhabited coastal regions of Washington, Oregon, and California (USFWS 2001). OSB populations only remain at five sites, four of which are in Oregon; one remaining population is in California, and none exist in Washington state as they have been extirpated (BFCI 2009; USFWS 2001). The site selected for this study was Rock Creek-Big Creek, adjacent to the Siuslaw National Forest. At this site OSB habitat is bisected by Highway 101; butterflies are observed to use both sides of the highway throughout their life cycle. …
Biogeography Of The American Pika (Ochotona Princeps) In Oregon And Southern Washington: Illuminating Genetic Relationships Among Disjunct Populations, George Washington Batten Iii
Biogeography Of The American Pika (Ochotona Princeps) In Oregon And Southern Washington: Illuminating Genetic Relationships Among Disjunct Populations, George Washington Batten Iii
Dissertations and Theses
The American pika (Ochotona princeps) finds moderately warm temperatures (>25°C) lethally stressful, and at the end of the last Ice Age 10,000 years ago was forced to disperse to cooler, "sky island" mountaintops where they are almost exclusively found today. Thirty six subspecies are recognized, all established using morphological characters, and it is uncertain whether these subspecies' designations are corroborated by genetic analyses. This study elucidates three hypotheses regarding populations in Oregon and southern Washington: 1) O. p. fumosa constitutes a subspecies distinct form O. p. brunnescens, 2) the Columbia River constitutes a barrier to gene …
Spatial Segregation Of The Sexes In A Salt Marsh Grass Distichlis Spicata (Poaceae), Charlene Ashley Mercer
Spatial Segregation Of The Sexes In A Salt Marsh Grass Distichlis Spicata (Poaceae), Charlene Ashley Mercer
Dissertations and Theses
Understanding the maintenance of sexual systems is of great interest to evolutionary and ecological biologists because plant systems are extremely varied. Plant sexual systems have evolved to include not only complete plants with both male and female reproduction occurring on one plant (i.e., monoecious and hermaphroditic) but also plants with male and female function on separate plants (dioecious). The dioecious reproductive system can be used to test theories on niche differentiation given that having separate plants potentially allows for the exploitation of a broader niche. This increase in the realized niche is due to the ability for separate sexes to …
Mitochondrial Inheritance And Natural Phenotypic Variation Among Caenorhabditis Briggsae Populations, Anna Luella Coleman-Hulbert
Mitochondrial Inheritance And Natural Phenotypic Variation Among Caenorhabditis Briggsae Populations, Anna Luella Coleman-Hulbert
Dissertations and Theses
Mutations affecting the mitochondrial electron transport chain cause numerous neurodegenerative disorders in humans and affect longevity in other organisms. A natural model system to study the relationship between mitochondrial function and aging within an evolutionary or population genetic context has been lacking. Natural populations of Caenorhabditis briggsae nematodes were recently found to harbor mitochondrial genetic variation with likely functional consequences for aging. Specifically, C. briggsae isolates containing high frequencies of a deletion mutation affecting the mitochondrial NADH dehydrogenase 5 (ND5) gene were found to have reduced reproductive fitness and lifespan and elevated levels of mutagenic superoxide. Here, rates …
Phylogeographic Patterns And Intervarietal Relationships Within Lupinus Lepidus: Morphological Differences, Genetic Similarities, Kevin Allen Weitemier
Phylogeographic Patterns And Intervarietal Relationships Within Lupinus Lepidus: Morphological Differences, Genetic Similarities, Kevin Allen Weitemier
Dissertations and Theses
Lupinus lepidus (Fabaceae) contains many morphologically divergent varieties and was restricted in its range during the last period of glaciation. A combination of phylogenetic (with the trnDT and LEGCYC1A loci) and population genetics approaches (with microsatellites and LEGCYC1A are used here to characterize intervarietal relationships and examine hypotheses of recolonization of areas in the Pacific Northwest affected by glaciation. Sequenced loci are not found to form a clade exclusive to L. lepidus, nor are any of the varieties found to form clades. Population genetics analyses reveal only negligible genetic structure within L. lepidus, with the majority of variation …