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Mining The Arabidopsis Thaliana Genome For Highly-Divergent Seven Transmembrane Receptors, Etsuko N. Moriyama, Pooja K. Strope, Stephen O. Opiyo, Zhongying Chen, Alan M. Jones Oct 2006

Mining The Arabidopsis Thaliana Genome For Highly-Divergent Seven Transmembrane Receptors, Etsuko N. Moriyama, Pooja K. Strope, Stephen O. Opiyo, Zhongying Chen, Alan M. Jones

School of Biological Sciences: Faculty Publications

To identify divergent seven-transmembrane receptor (7TMR) candidates from the Arabidopsis thaliana genome, multiple protein classification methods were combined, including both alignmentbased and alignment-free classifiers. This resolved problems in optimally training individual classifiers using limited and divergent samples, and increased stringency for candidate proteins. We identified 394 proteins as 7TMR candidates and highlighted 54 with corresponding expression patterns for further investigation.

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A Lake Restoration Plan For Furman Lake, Lake Restoration Task Force, Wade Worthen, Wes Dripps Oct 2006

A Lake Restoration Plan For Furman Lake, Lake Restoration Task Force, Wade Worthen, Wes Dripps

Furman Lake Restoration Book Gallery

A twelve page document submitted by The Lake Restoration Task Force. The document lists the members of the task force, gives an overview of the project, the current status at the time of submission, lays out a new vision for the lake, and a plan to improve the environmental integrity of the lake watershed, plus design elements to create a multi-purpose facility. It concludes with a section on the lake as pedagogy and recommendations for moving forward with the master plan.

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Adherens Junction-Associated Protein Distribution Differs In Smooth Muscle Tissue And Acutely Isolated Cells, Thomas J. Eddinger, Jessen D. Schiebout, Darl R. Swartz Oct 2006

Adherens Junction-Associated Protein Distribution Differs In Smooth Muscle Tissue And Acutely Isolated Cells, Thomas J. Eddinger, Jessen D. Schiebout, Darl R. Swartz

Biological Sciences Faculty Research and Publications

This study was designed to examine how smooth muscle (SM) cell (SMC) isolation affects the distribution of some adherens junction (AJ) complex-associated proteins. Immunofluorescence procedures for identifying protein distribution were used on gastrointestinal and tracheal SM tissues and freshly isolated SMCs from dogs and rabbits. As confirmed by force measurements, relaxation, Ca2+ depletion, and cholinergic activation of SM tissues do not cause significant redistribution of the AJ-associated proteins vinculin, talin, or fibronectin away from the plasma membrane. Unlike SMCs in tissue, freshly isolated SMCs show a variable peripheral/ cytoplasmic vinculin and talin distribution that is not altered by activation. …

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Distance-Based Genome Rearrangement Phylogeny, Li-San Wang, Tandy Warnow, Bernard M.E. Moret, Robert K. Jansen, Linda A. Raubeson Oct 2006

Distance-Based Genome Rearrangement Phylogeny, Li-San Wang, Tandy Warnow, Bernard M.E. Moret, Robert K. Jansen, Linda A. Raubeson

All Faculty Scholarship for the College of the Sciences

Evolution operates on whole genomes through direct rearrangements of genes, such as inversions, transpositions, and inverted transpositions, as well as through operations, such as duplications, losses, and transfers, that also affect the gene content of the genomes. Because these events are rare relative to nucleotide substitutions, gene order data offer the possibility of resolving ancient branches in the tree of life; the combination of gene order data with sequence data also has the potential to provide more robust phylogenetic reconstructions, since each can elucidate evolution at different time scales. Distance corrections greatly improve the accuracy of phylogeny reconstructions from DNA …

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Environmental Rearing Conditions Produce Forebrain Differences In Wild Chinook Salmon Oncorhynchus Tshawytscha, R. L. Kihslinger, Sean C. Lema, G. A. Nevitt Oct 2006

Environmental Rearing Conditions Produce Forebrain Differences In Wild Chinook Salmon Oncorhynchus Tshawytscha, R. L. Kihslinger, Sean C. Lema, G. A. Nevitt

Biological Sciences

Recent studies suggest that hatchery-reared fish can have smaller brain-to-body size ratios than wild fish. It is unclear, however, whether these differences are due to artificial selection or instead reflect differences in rearing environment during development. Here we explore how rearing conditions influence the development of two forebrain structures, the olfactory bulb and the telencephalon, in juvenile Chinook salmon (Oncorhynchus tshawytscha) spawned from wild-caught adults. First, we compared the sizes of the olfactory bulb and telencephalon between salmon reared in a wild stream vs. a conventional hatchery. We next compared the sizes of forebrain structures between fish reared …

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The Effects Of Carotenoid And Food Availability On Resistance To A Naturally Occurring Parasite (Gyrodactylus Turnbulli) In Guppies (Poecilia Reticulata), Gita R. Kolluru, Gregory F. Grether, Sandra H. South, Eric Dunlop, Andrea Cardinali, Linda Liu, Andreah Carapiet Oct 2006

The Effects Of Carotenoid And Food Availability On Resistance To A Naturally Occurring Parasite (Gyrodactylus Turnbulli) In Guppies (Poecilia Reticulata), Gita R. Kolluru, Gregory F. Grether, Sandra H. South, Eric Dunlop, Andrea Cardinali, Linda Liu, Andreah Carapiet

Biological Sciences

Dietary carotenoids have been shown to confer immunological benefits to some species of animals in which males also use these pigments to attract mates. Thus, the potential exists for an allocation trade-off between the sexual and immunological functions of carotenoids. Food availability may also influence immune system function. The present study examined the effects of carotenoid and food availability on the resistance of male guppies (Poecilia reticulata Peters) from four wild populations to the parasite Gyrodactylus turnbulli Harris. Intermediate levels of carotenoid ingestion resulted in the lowest parasite loads, which suggests that carotenoids strengthen parasite resistance at low levels …

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A Scoping Paper : Matters Relevant To The Development Of A Sustainable Allocation And Growout Modul For Western Lobster Pueruli, Department Of Fisheries Western Australia Oct 2006

A Scoping Paper : Matters Relevant To The Development Of A Sustainable Allocation And Growout Modul For Western Lobster Pueruli, Department Of Fisheries Western Australia

Fisheries Management Papers

This Scoping Paper has been prepared as a first step in the development of a management framework for a commercial western rock lobster puerulus growout aquaculture industry in Western Australia. The purpose of this Scoping Paper is to identify and scope the issues associated with the development of such an industry and to identify matters which should be considered in the development of a management framework.

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Consumers Limit The Abundance And Dynamics Of A Perennial Shrub With A Seed Bank, Matthew J. Kauffman, John L. Maron Oct 2006

Consumers Limit The Abundance And Dynamics Of A Perennial Shrub With A Seed Bank, Matthew J. Kauffman, John L. Maron

Biological Sciences Faculty Publications

For nearly 30 years, ecologists have argued that predators of seeds and seedlings seldom have population-level effects on plants with persistent seed banks and density-dependent seedling survival. We parameterized stage-based population models that incorporated density dependence and seed dormancy with data from a 5.5-year experiment that quantified how granivorous mice and herbivorous voles influence bush lupine (Lupinus arboreus) demography. We asked how seed dormancy and density-dependent seedling survival mediate the impacts of these consumers in dune and grassland habitats. In dune habitat, mice reduced analytical lambda (the intrinsic rate of population growth) by 39%, the equilibrium number of above-ground plants …

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Mig-5/Dsh Controls Cell Fate Determination And Cell Migration In C. Elegans, Timothy Walston, Chaobo Guo, Rui Proenca, Mingfu Wu, Michael Herman, Jeff Hardin, Edward Hedgecock Oct 2006

Mig-5/Dsh Controls Cell Fate Determination And Cell Migration In C. Elegans, Timothy Walston, Chaobo Guo, Rui Proenca, Mingfu Wu, Michael Herman, Jeff Hardin, Edward Hedgecock

School of Biological Sciences: Faculty Publications

Cell fate determination and cell migration are two essential events in the development of an organism. We identify mig-5, a Dishevelled family member, as a gene that regulates several cell fate decisions and cell migrations that are important during C. elegans embryonic and larval development. In offspring from mig-5 mutants, cell migrations are defective during hypodermal morphogenesis, QL neuroblast migration, and the gonad arm migration led by the distal tip cells (DTCs). In addition to abnormal migration, DTC fate is affected, resulting in either an absent or an extra DTC. The cell fates of the anchor cell in hermaphrodites …

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Invasion Through Quantitative Effects: Intense Shade Drives Native Decline And Invasive Success, Kurt O. Reinhart, Julie Gurnee, Reyes Tirado, Ragan M. Callaway Oct 2006

Invasion Through Quantitative Effects: Intense Shade Drives Native Decline And Invasive Success, Kurt O. Reinhart, Julie Gurnee, Reyes Tirado, Ragan M. Callaway

Biological Sciences Faculty Publications

The effects of invasive nonnative species on community composition are well documented. However, few studies have determined the mechanisms by which invaders drive these changes. The literature indicates that many nonnative plant species alter light availability differently than natives in a given community, suggesting that shading may be such a mechanism. We compared light quantity (photosynthetically active radiation, PAR) and quality (red : far-red ratio, R:Fr) in riparian reaches heavily invaded by a nonnative tree (Acer platanoides) to that in an uninvaded forest and experimentally tested the effects of our measured differences in PAR and R:Fr on the …

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Year-Round Diet Of The Marsh Rice Rat, Oryzomys Palustris, In Virginia Tidal Marshes, Robert K. Rose, Shannon W. Mcgurk Oct 2006

Year-Round Diet Of The Marsh Rice Rat, Oryzomys Palustris, In Virginia Tidal Marshes, Robert K. Rose, Shannon W. Mcgurk

Virginia Journal of Science

The marsh rice rat, Oryzomys palustris, is the dominant semi-aquatic rodent living in tidal marshes of the Virginia coastal plain. Described as highly carnivorous, this species is known to consume a range of animal foods, including crustaceans, mollusks, fish, and arthropods, as well as some plant foods. Analysis of stomach contents from rice rats collected from Eastern Shore tidal marshes throughout an annual cycle revealed that all 103 stomachs contained dicots, 82 percent had monocots, 61 percent had crabs and insects, and 38 percent had snails. Thirty-eight percent of stomachs contained foods in all five categories, no stomach was …

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Effects Of Long-Term Hypoxia On Enzymes Of Carbohydrate Metabolism In The Gulf Killifish, Fundulus Grandis, Bernard Rees Oct 2006

Effects Of Long-Term Hypoxia On Enzymes Of Carbohydrate Metabolism In The Gulf Killifish, Fundulus Grandis, Bernard Rees

Biological Sciences Faculty Publications

The goal of the current study was to generate a comprehensive, multi-tissue perspective of the effects of chronic hypoxic exposure on carbohydrate metabolism in the Gulf killifish Fundulus grandis. Fish were held at approximately 1.3 mg l(-1) dissolved oxygen (approximately 3.6 kPa) for 4 weeks, after which maximal activities were measured for all glycolytic enzymes in four tissues (white skeletal muscle, liver, heart and brain), as well as for enzymes of glycogen metabolism (in muscle and liver) and gluconeogenesis (in liver). The specific activities of enzymes of glycolysis and glycogen metabolism were strongly suppressed by hypoxia in white skeletal muscle, …

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Spinobulbar Neurons In Lamprey: Cellular Properties And Synaptic Interactions, James F. Einum, James T. Buchanan Oct 2006

Spinobulbar Neurons In Lamprey: Cellular Properties And Synaptic Interactions, James F. Einum, James T. Buchanan

Biological Sciences Faculty Research and Publications

An in vitro preparation of the nervous system of the lamprey, a lower vertebrate, was used to characterize the properties of spinal neurons with axons projecting to the brain stem [i.e., spinobulbar (SB) neurons)]. To identify SB neurons, extracellular electrodes on each side of the spinal cord near the obex recorded the axonal spikes of neurons impaled with sharp intracellular microelectrodes in the rostral spinal cord. The ascending spinal neurons (n = 144) included those with ipsilateral (iSB) (63/144), contralateral (cSB) (77/144), or bilateral (bSB) (4/144) axonal projections to the brain stem. Intracellular injection of biocytin revealed that the …

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An Automated Method For Rapid Identification Of Putative Gene Family Members In Plants, Ronald L. Frank, Ajay Mane, Fikret Erçal Sep 2006

An Automated Method For Rapid Identification Of Putative Gene Family Members In Plants, Ronald L. Frank, Ajay Mane, Fikret Erçal

Biological Sciences Faculty Research & Creative Works

Background: Gene duplication events have played a significant role in genome evolution, particularly in plants. Exhaustive searches for all members of a known gene family as well as the identification of new gene families has become increasingly important. Subfunctionalization via changes in regulatory sequences following duplication (adaptive selection) appears to be a common mechanism of evolution in plants and can be accompanied by purifying selection on the coding region. Such negative selection can be detected by a bias toward synonymous over nonsynonymous substitutions. However, the process of identifying this bias requires many steps usually employing several different software programs. We …

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Testing An Ecophysiological Mechanism Of Morphological Plasticity In Pupfish And Its Relevance To Conservation Efforts For Endangered Devils Hole Pupfish, Sean C. Lema, Gabrielle A. Nevitt Sep 2006

Testing An Ecophysiological Mechanism Of Morphological Plasticity In Pupfish And Its Relevance To Conservation Efforts For Endangered Devils Hole Pupfish, Sean C. Lema, Gabrielle A. Nevitt

Biological Sciences

Imperiled species that have been translocated or established in captivity can show rapid alterations in morphology and behavior, but the proximate mechanisms of such phenotypic changes are rarely known. Devils Hole pupfish (Cyprinodon diabolis) are endemic to a single desert pool and are characterized by a small body, large head and eyes, and lack of pelvic fins. To lessen the risk of extinction, additional populations of C. diabolis were established in artificial refuges. Yet, pupfish in these refuges rapidly shifted to a larger body, smaller head and eyes, and greater body depth. Here we examined how food availability …

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Reflections On Wallace, Charles H. Smith Sep 2006

Reflections On Wallace, Charles H. Smith

DLPS Faculty Publications

An unpublished paper has recently come to light, which shows that even at an early age, Alfred Russel Wallace was bold enough to approach the scientific establishment with his ideas.

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Comparative Sequence Analysis And Tissue Localization Of Members Of The Slc6 Family Of Transporters In Adult Drosophila Melanogaster, Matthew S. Thimgan, Jonathan S. Berg, Ann E. Stuart Sep 2006

Comparative Sequence Analysis And Tissue Localization Of Members Of The Slc6 Family Of Transporters In Adult Drosophila Melanogaster, Matthew S. Thimgan, Jonathan S. Berg, Ann E. Stuart

Biological Sciences Faculty Research & Creative Works

The SLC6 family comprises proteins that move extracellular neurotransmitters, amino acids and osmolytes across the plasma membrane into the cytosol. In mammals, deletion of SLC6 family members has dramatic physiologic consequences, but in the model organism Drosophila melanogaster, little is known about this family of proteins. Therefore, in this study we carried out an initial analysis of 21 known or putative SLC6 family members from the Drosophila genome. Protein sequences from these genes segregated into either well-defined subfamilies, including the novel insect amino acid transporter subfamily, or into a group of weakly related sequences not affiliated with a recognized …

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In Situ Muscle Power Differs Without Varying In Vitro Mechanical Properties In Two Insect Leg Muscles Innervated By The Same Motor Neuron, Anna N. Ahn, Kenneth Meijer, Robert J. Full Sep 2006

In Situ Muscle Power Differs Without Varying In Vitro Mechanical Properties In Two Insect Leg Muscles Innervated By The Same Motor Neuron, Anna N. Ahn, Kenneth Meijer, Robert J. Full

All HMC Faculty Publications and Research

The mechanical behavior of muscle during locomotion is often predicted by its anatomy, kinematics, activation pattern and contractile properties. The neuromuscular design of the cockroach leg provides a model system to examine these assumptions, because a single motor neuron innervates two extensor muscles operating at a single joint. Comparisons of the in situ measurements under in vivo running conditions of muscle 178 to a previously examined muscle (179) demonstrate that the same inputs (e.g. neural signal and kinematics) can result in different mechanical outputs. The same neural signal and kinematics, as determined during running, can result in different mechanical functions, …

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Diversity Of The Ig Repertoire Is Maintained With Age In Spite Of Reduced Germinal Centre Cells In Human Tonsil Lymphoid Tissue, G. R. Kolar, D. Mehta, P. C. Wilson, J. D. Capra Sep 2006

Diversity Of The Ig Repertoire Is Maintained With Age In Spite Of Reduced Germinal Centre Cells In Human Tonsil Lymphoid Tissue, G. R. Kolar, D. Mehta, P. C. Wilson, J. D. Capra

Biological Sciences Faculty Research & Creative Works

Humans and almost all species studied to date exhibit a decreased responsiveness to immunization and increased autoimmunity with age. While this has been observed clinically for decades, only recently has an understanding of the molecular basis for these changes begun to be appreciated. Studies of the B-cell aspects of these changes in ageing mice and the very few reports in ageing humans have not been conclusive. Here we examine the nucleotide sequence of over 1250 VH transcripts from the tonsils of individuals of various ages for changes to the VH4 immunoglobulin repertoire. An exhaustive examination of VH, DH and JH …

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Behavioural Responses Of Blue Petrel Chicks (Halobaena Caerulea) To Food-Related And Novel Odours In A Simple Wind Tunnel, Gregory B. Cunningham, Richard W. Van Buskirk, Mark J. Hodges, Henri Weimerskirch, Gabrielle A. Nevitt Sep 2006

Behavioural Responses Of Blue Petrel Chicks (Halobaena Caerulea) To Food-Related And Novel Odours In A Simple Wind Tunnel, Gregory B. Cunningham, Richard W. Van Buskirk, Mark J. Hodges, Henri Weimerskirch, Gabrielle A. Nevitt

Biology Faculty/Staff Publications

No abstract provided.

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Utilization Of Sea Scallop (Placopecten Magellanicus Gmelin) Microsatellite Markers For Phylogenetic Applications In Bay Scallops (Argopecten Irradians Lamarck), Lilliana E.J. Kim, James J. Campanella, Paul Ax Bologna Sep 2006

Utilization Of Sea Scallop (Placopecten Magellanicus Gmelin) Microsatellite Markers For Phylogenetic Applications In Bay Scallops (Argopecten Irradians Lamarck), Lilliana E.J. Kim, James J. Campanella, Paul Ax Bologna

Department of Biology Faculty Scholarship and Creative Works

In previous research, microsatellite markers have been used to geographically and phylogenetically characterize and identify populations of sea scallops (Placopecten magellanicus Gmelin). Given that sea scallops are a closely related species to bay scallops (Argopecten irradians Lamarck), we have investigated whether the flanking DNA sequences of sea scallop microsatellite loci have been conserved in the bay scallop. We found that in all seven sets of published sea scallop PCR primers (Pma130, -132, -135, -180, -200, -212, and -275) that were tested with bay scallop DNA, there was sequence conservation and amplification of microsatellite regions. Our initial phylogenetic analyses, …

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Censusing And Measuring Lianas: A Quantitative Comparison Of The Common Methods, Stefan A. Schnitzer, Saara J. Dewalt, Jérôme Chave Sep 2006

Censusing And Measuring Lianas: A Quantitative Comparison Of The Common Methods, Stefan A. Schnitzer, Saara J. Dewalt, Jérôme Chave

Biological Sciences Faculty Research and Publications

Lianas contribute to many aspects of tropical forest diversity and dynamics, and interest in liana ecology has grown substantially in recent years. Methods to census lianas and estimate biomass, however, differ among studies, possibly hindering attempts to compare liana communities. At Nouragues Research Station (French Guiana), we tested the extent to which liana abundance, basal area, and estimated biomass differed depending on stem diameter measurement location, inclusion of ramets, inclusion of lianas rooted within versus passing through the plot, and plot shape. We found that the mean per plot abundance and basal area of lianas were significantly greater when lianas …

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Rana Ocellata Linnaeus, 1758 (Currently Leptodactylus Ocellatus; Amphibia, Anura): Proposed Conservation Of Usage Of The Specific Name By The Designation Of A Neotype, W. Ronald Heyer, Ulisses Caramaschi, Rafael O. De Sá Sep 2006

Rana Ocellata Linnaeus, 1758 (Currently Leptodactylus Ocellatus; Amphibia, Anura): Proposed Conservation Of Usage Of The Specific Name By The Designation Of A Neotype, W. Ronald Heyer, Ulisses Caramaschi, Rafael O. De Sá

Biology Faculty Publications

The purpose of this application, under Article 75.6 of the Code, is to conserve the usage of the specific name of Rana ocellata Linnaeus, 1758 for a species of leptodactylid frog from South America by the designation of a neotype. Prevailing usage of the name is threatened by the identity of the type specimen which is a different species than that which is currently known as Leptodactylus ocellatus. It is proposed that all name-bearing types be set aside and a neotype designated in accord with prevailing usage.

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Retrotranspositions In Orthologous Regions Of Closely Related Grass Species, Chunguang Du, Zuzana Swigoňová, Joachim Messing Aug 2006

Retrotranspositions In Orthologous Regions Of Closely Related Grass Species, Chunguang Du, Zuzana Swigoňová, Joachim Messing

Department of Biology Faculty Scholarship and Creative Works

Background: Retrotransposons are commonly occurring eukaryotic transposable elements (TEs). Among these, long terminal repeat (LTR) retrotransposons are the most abundant TEs and can comprise 50-90% of the genome in higher plants. By comparing the orthologous chromosomal regions of closely related species, the effects of TEs on the evolution of plant genomes can be studied in detail. Results: Here, we compared the composition and organization of TEs within five orthologous chromosomal regions among three grass species: maize, sorghum, and rice. We identified a total of 132 full or fragmented LTR retrotransposons in these regions. As a percentage of the total cumulative …

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Integration Of Hybridization-Based Markers (Overgos) Into Physical Maps For Comparative And Evolutionary Explorations In The Genus Oryza And In Sorghum, Barbara L. Hass-Jacobus, Montona Futrell-Griggs, Brian Abernathy, Rick Westerman, Jose-Luis Goicoechea, Joshua Stein, Patricia Klein, Bonnie Hurwitz, Bin Zhou, Fariborz Rakhshan, Abhijit Sanyal, Navdeep Gill, Jer-Young Lin, Jason G. Walling, Mei Zhong Luo, Jetty Siva S Ammiraju, Dave Kudrna, Hye Ran Kim, Doreen Ware, Rod A. Wing, Phillip San Miguel, Scott A. Jackson Aug 2006

Integration Of Hybridization-Based Markers (Overgos) Into Physical Maps For Comparative And Evolutionary Explorations In The Genus Oryza And In Sorghum, Barbara L. Hass-Jacobus, Montona Futrell-Griggs, Brian Abernathy, Rick Westerman, Jose-Luis Goicoechea, Joshua Stein, Patricia Klein, Bonnie Hurwitz, Bin Zhou, Fariborz Rakhshan, Abhijit Sanyal, Navdeep Gill, Jer-Young Lin, Jason G. Walling, Mei Zhong Luo, Jetty Siva S Ammiraju, Dave Kudrna, Hye Ran Kim, Doreen Ware, Rod A. Wing, Phillip San Miguel, Scott A. Jackson

Biology Faculty Articles

Background: With the completion of the genome sequence for rice (Oryza sativa L.), the focus of rice genomics research has shifted to the comparison of the rice genome with genomes of other species for gene cloning, breeding, and evolutionary studies. The genus Oryza includes 23 species that shared a common ancestor 8–10 million years ago making this an ideal model for investigations into the processes underlying domestication, as many of the Oryza species are still undergoing domestication. This study integrates high-throughput, hybridization-based markers with BAC end sequence and fingerprint data to construct physical maps of rice chromosome 1 orthologues in …

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Population Divergence In Plasticity Of The Avt System And Its Association With Aggressive Behaviors In A Death Valley Pupfish, Sean C. Lema Aug 2006

Population Divergence In Plasticity Of The Avt System And Its Association With Aggressive Behaviors In A Death Valley Pupfish, Sean C. Lema

Biological Sciences

Behavioral differences can evolve rapidly in allopatry, but little is known about the neural bases of such changes. Allopatric populations of Amargosa pupfish (Cyprinodon nevadensis) vary in aggression and courtship behaviors in the wild. Two of these wild populations were recently found to differ in brain expression of arginine vasotocin (AVT)—a peptide hormone shown previously to modulate aggression in pupfish. These populations have been isolated for less than 4000 years, so it remained unclear whether the differences in behavior and neural AVT phenotype were evolved changes or plastic responses to ecologically dissimilar habitats. Here, I tested whether these …

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The Effects Of Dispersal And Recruitment Limitation On Community Structure Of Odonates In Artificial Ponds, Shannon J. Mccauley Aug 2006

The Effects Of Dispersal And Recruitment Limitation On Community Structure Of Odonates In Artificial Ponds, Shannon J. Mccauley

Biological Sciences

I examined the effects of isolation on the structure of both adult and larval dragonfly (Odonata: Anisoptera) communities forming at physically identical artificial ponds over two years. Isolation, whether measured by distance to the nearest source habitat or by connectivity to multiple sources, was significantly negatively related to the species richness of dragonflies observed at and collected in these ponds. These results indicate that dispersal and recruitment limitation acted as filters on the richness of communities at these artificial ponds. The richness of larval recruits in artificial ponds was lower than the richness of adult dispersers observed at ponds, and …

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Integrated Fisheries Management Draft Allocation Report Roe's Abalone Perth Metropolitan Region., Integrated Fisheries Allocation Advisory Committee Aug 2006

Integrated Fisheries Management Draft Allocation Report Roe's Abalone Perth Metropolitan Region., Integrated Fisheries Allocation Advisory Committee

Fisheries Management Papers

The IFAAC has prepared this report, which documents the committee’s initial position on allocations for the abalone resource, along with the reasons for its conclusions as a basis for widespread community consultation. This report follows the IFAAC’s preliminary investigation of the abalone resourcesharing issues and consultation with stakeholders

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Identification And Characterization Of Cellular Targets Of The Bacterial Cytotoxin Yopt In Saccharomyces Cerevisiae, Paul David Caccamo Aug 2006

Identification And Characterization Of Cellular Targets Of The Bacterial Cytotoxin Yopt In Saccharomyces Cerevisiae, Paul David Caccamo

Masters Theses

Human pathogenic Yersinia spp. utilize Type III Secretion to deliver six effector proteins into host cells. The injected proteins resemble eukaryotic signal transduction molecules and are capable of disrupting signaling pathways in order to subvert the functions of the targeted cell or disrupt communication with surrounding cells. As a result, bacterial invaders are not only able to survive the threat of a host immune response, but can thrive despite it. YopT is a cysteine protease that cleaves RhoGTPases, releasing them from the membrane and thus from their role as initiators of signaling pathways, including the nucleation of actin and …

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Disturbance Facilitates Invasion: The Effects Are Stronger Abroad Than At Home, José L. Hierro, Diego Villarreal, Özkan Eren, Jon M. Graham, Ragan M. Callaway Aug 2006

Disturbance Facilitates Invasion: The Effects Are Stronger Abroad Than At Home, José L. Hierro, Diego Villarreal, Özkan Eren, Jon M. Graham, Ragan M. Callaway

Biological Sciences Faculty Publications

Disturbance is one of the most important factors promoting exotic invasion. However, if disturbance per se is sufficient to explain exotic success, then "invasion" abroad should not differ from "colonization" at home. Comparisons of the effects of disturbance on organisms in their native and introduced ranges are crucial to elucidate whether this is the case; however, such comparisons have not been conducted. We investigated the effects of disturbance on the success of Eurasian native Centaurea solstitialis in two invaded regions, California and Argentina, and one native region, Turkey, by conducting field experiments consisting of simulating different disturbances and adding locally …

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