Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Dispersal (2)
- Poeciliidae (2)
- Abundance (1)
- Aquatic invertebrates (1)
- Assessment (1)
-
- Behavioral syndromes (1)
- Biodiversity (1)
- Brachyrhaphis (1)
- Callibaetis americanus (1)
- Carbon (1)
- Clade phylogeographic analysis (NCPA) (1)
- CoI (1)
- Community assembly (1)
- Cytb (1)
- Deuterium (1)
- Education (1)
- En2 (1)
- Evenness (1)
- Fgb-17 (1)
- Geometric morphometrics (1)
- Great Basin (1)
- Habitat quality (1)
- Heteromyinae (1)
- Heteromys (1)
- Hyalella azteca (1)
- Hydrogen (1)
- Learning styles (1)
- Lepidomeda (1)
- Life history theory (1)
- Liomys (1)
Articles 1 - 8 of 8
Full-Text Articles in Life Sciences
Inferring Dispersal Of Aquatic Invertebrates From Genetic Variation: A Comparative Study Of An Amphipod (Talitridae Hyalella Azteca) And Mayfly (Baetidae Callibaetis Americanus) In Great Basin Springs, Heather Lynn Stutz
Theses and Dissertations
Whether active or passive, dispersal accompanied by gene flow shapes the population genetics and evolutionary divergence of species. Indirect methods which use genetic markers have the ability to assess effective dispersal—that which resulted in gene flow. My objective was to see if an aquatic insect and an obligate aquatic invertebrate show similar phylogeographic patterns and genetic uniqueness. Hyalella azteca and Callibaetis americanus were collected from 4-5 springs in each of six basins in the Great Basin of western North America. No dispersal or genetic studies of C. americanus have been conducted to date. However, several studies focusing on mtDNA diversity …
The Ecological Importance Of Extrinsic And Intrinsic Drivers Of Animal Movement, Josh Earl Rasmussen
The Ecological Importance Of Extrinsic And Intrinsic Drivers Of Animal Movement, Josh Earl Rasmussen
Theses and Dissertations
The movement of individuals is foundational to many ecological processes. For example, the movement of an organism from one place to another alters population density at both sites and has potential for affecting the genetic dynamics within the new population. Individual movement events may be in synchrony with overall trends in populations, e.g. spawning migrations, or may be atypical (asynchronous). This latter movement type can affect population and metapopulation dynamics, depending on its prevalence within a population. Nevertheless, given the complexity of interactions, the causative factors of movement are understood vaguely, much less for aquatic organisms. Drivers of movement are …
Intraspecific Phylogeography Of Cycladenia Humilis (Apocynaceae), Mariana P. Last
Intraspecific Phylogeography Of Cycladenia Humilis (Apocynaceae), Mariana P. Last
Theses and Dissertations
Cycladenia humilis (Apocynaceae) is a rare perennial herb native to western North America and has a fragmented distribution in California, Utah, and Arizona. Populations in Utah and Arizona are federally listed as threatened, while there is no conservation status applied to California populations. Using genetic (three chloroplast and two nuclear DNA loci) and morphological characters, intraspecific variation between populations of C. humilis and current taxonomic conventions were assessed. Nested Clade Phylogeographic Analysis and Bayesian phylogenies were used to assess patterns within C. humilis and supported three main population groupings: a northern California, southern California, and Colorado Plateau group. The northern …
The Trouble With Transfer, Kathryn Jane Groneman
The Trouble With Transfer, Kathryn Jane Groneman
Theses and Dissertations
It is hoped that the scientific reasoning skills taught in our biology courses will carry over to be applied in novel settings: to new concepts, future courses, other disciplines, and non-academic pursuits. This is the educational concept of transfer. Efforts over many years in the Cell Biology course at BYU to design effective assessment questions that measure competence in both deep understanding of conceptual principles and the ability to draw valid conclusions from experimental data have had at least one disquieting result. The transfer performance of many otherwise capable students is not very satisfactory. In order to explain this unsatisfactory …
Co-Occurrence With A Congeneric Species Predicts Life History And Morphological Diversification In The Mexican Livebearing Fish Poelicopsis Baenschi, Laura E. Scott
Theses and Dissertations
Understanding why some species coexist and others do not remains one of the fundamental challenges of ecology. While several lines of evidence suggest that closely related species are unlikely to occupy the same habitat because of competitive exclusion, there are many cases where closely related species do co-occur. Research comparing sympatric and allopatric populations of co-occurring species provides a framework to understand the role of phenotypic diversification in species coexistence. In this study I focus on the livebearing fish Poeciliopsis baenschi and ask if differences in phenotypic traits among populations can be explained by the presence or absence of the …
Molecular Systematics Of Spiny Pocket Mice (Subfamily Heteromyinae) Inferred From Mitochondrial And Nuclear Sequence Data, Melina Crystal Williamson
Molecular Systematics Of Spiny Pocket Mice (Subfamily Heteromyinae) Inferred From Mitochondrial And Nuclear Sequence Data, Melina Crystal Williamson
Theses and Dissertations
This study aims to determine species-level relationships within the genus Heteromys, as well as generic-level relationships among members of the subfamily Heteromyinae using a phylogenetic framework. Molecular sequence data were generated from two mitochondrial genes (cytochrome b and cytochrome oxidase I) and three nuclear gene segments (β-fibrinogen, engrailed protein II, and myosin heavy chain II), and analyzed under maximum parsimony, maximum likelihood, and Bayesian optimality criteria to infer relationships. Chapter 1 focuses on the phylogenetic and taxonomic implications for Heteromys from the analyses of sequence data. Phylogenies also provided a framework for delimiting species boundaries within the wide-ranging Heteromys desmarestianus …
Biogeography Of The Livebearing Fish Poecilia Gillii In Costa Rica: Are Phylogeographic Breaks Congruent With Fish Community Boundaries?, Jared Benjamin Lee
Biogeography Of The Livebearing Fish Poecilia Gillii In Costa Rica: Are Phylogeographic Breaks Congruent With Fish Community Boundaries?, Jared Benjamin Lee
Theses and Dissertations
One of the original goals of phylogeography was to use genetic data to identify historical events that might contribute to breaks among biotic communities. In this study, we examine the phylogeography of a common livebearing fish (Poecilia gillii) from Costa Rica. Our goal was to see if phylogeographic breaks in this species were congruent with previously-defined boundaries among four fish community provinces. We hypothesized that if abiotic factors influence both community boundaries and genetic structuring in P. gillii then we would find four monophyletic clades within our focal species that were geographically separated along community boundary lines. Similarly, we expected …
Small Mammals In Portions Of Great Basin National Park Susceptible To Groundwater Withdrawal: Diversity And Stable Isotope Perspectives, Bryan T. Hamilton
Small Mammals In Portions Of Great Basin National Park Susceptible To Groundwater Withdrawal: Diversity And Stable Isotope Perspectives, Bryan T. Hamilton
Theses and Dissertations
To support population growth in Las Vegas, Nevada, large scale increases in groundwater pumping are planned across the state. This pumping could affect riparian areas in Great Basin National Park by lowering groundwater levels, reducing stream flows, and xerifying riparian vegetation. Great Basin National Park (GBNP) is mandated to manage its resources unimpaired for future generations. Loss of biodiversity is unacceptable under this mandate. If groundwater levels are reduced beyond a threshold, aquatic and riparian diversity would be lost, but the effects on small mammal communities are less clear. To provide baseline information and to consider the effects of groundwater …