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Articles 2011 - 2040 of 3640

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Experimentally Altered Navigational Demands Induce Changes In The Cortical Forebrain Of Free-Ranging Northern Pacific Rattlesnakes (Crotalus O. Oreganus), Matthew L. Holding, Julius A. Frazier, Emily N. Taylor, Christine R. Strand Jan 2012

Experimentally Altered Navigational Demands Induce Changes In The Cortical Forebrain Of Free-Ranging Northern Pacific Rattlesnakes (Crotalus O. Oreganus), Matthew L. Holding, Julius A. Frazier, Emily N. Taylor, Christine R. Strand

Biological Sciences

The hippocampus of birds and mammals plays a crucial role in spatial memory and navigation. The hippocampus exhibits plasticity in adulthood in response to diverse environmental factors associated with spatial demands placed on an animal. The medial and dorsal cortices of the telencephalon of squamate reptiles have been implicated as functional homologues to the hippocampus. This study sought to experimentally manipulate the navigational demands placed on free-ranging northern Pacific rattlesnakes (Crotalus o. oreganus) to provide direct evidence of the relationship between spatial demands and neuroplasticity in the cortical telencephalon of the squamate brain. Adult male rattlesnakes were radio-tracked for 2 …

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Food Habits Of The Hoary Bat In An Agricultural Landscape, Mathew K. Perlik, Brock R. Mcmillan, John D. Krenz Jan 2012

Food Habits Of The Hoary Bat In An Agricultural Landscape, Mathew K. Perlik, Brock R. Mcmillan, John D. Krenz

Journal of the Minnesota Academy of Science

Information on diets is fundamental to ecological studies. Prey use by the solitary, tree-roosting hoary bat (Lasiurus cinereus) in agricultural landscapes is not known. We examined the stomach contents and fecal material from carcasses of hoary bats collected during a mortality study at wind turbine sites in southwestern Minnesota. We compared diet of hoary bats to availability of prey to determine whether bats were opportunistic or selective. Food of the hoary bats primarily consisted of lepidopterans (moths; 49-50 %) and coleopterans (beetles; 28-40 %). The abundance of insects in the diet of hoary bats was not proportional to the estimated …

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Development Of A Soil Carbon Index For Iowa Mineral Soils, M. M. Al-Kaisi, T. E. Fenton, J. G. Guzman, B. R. O'Neal Jan 2012

Development Of A Soil Carbon Index For Iowa Mineral Soils, M. M. Al-Kaisi, T. E. Fenton, J. G. Guzman, B. R. O'Neal

Journal of the Iowa Academy of Science: JIAS

A carbon index (Cl) is one of many soil quality indicators that depends on organic carbon concentration. One of the values of a soil carbon index is in determining the impact of agriculture practices (i.e., tillage, crop rotation, N management, etc.) on soil organic matter status of mineral soils. Interactions of climate, parent material, topography, time, and organisms including human activities influence soil organic carbon (SOC). This study developed a soil carbon index for mineral soil map units in Iowa using data collected by the Iowa Cooperative Soil Survey Laboratory and the USDA Soil Survey Laboratory for over 2,300 soil …

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Nest Success And Hatchling Survival Of American Alligators Within Inland Wetlands Of East Texas, Warren C. Conway, Gary Calkins, David Saalfeld Jan 2012

Nest Success And Hatchling Survival Of American Alligators Within Inland Wetlands Of East Texas, Warren C. Conway, Gary Calkins, David Saalfeld

Faculty Publications

Because of liberalization of American alligator (Alligator mississippiensis) harvest management in Texas, estimates of nest success and hatchling survival for inland populations are essential for long-term, sustainable population and harvest management. To date, few studies have examined American alligator nest success and hatchling survival. We initiated a 3-year study from 2006 to 2008 to document alligator nest success and hatchling survival within several wetlands in east Texas. From June 2006 to August 2008, we located 30 nests from 3 wetlands within east Texas, where overall nest success was 44.2% (95% CI=25.1– 63.1%), irrespective of year. Nest circumference and day during …

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Wildfire Regime Shifts In Temperate Forest Ecosystems: International Symposium In New Zealand, Tomas Veblen, Alan Tepley, Andres Holz Jan 2012

Wildfire Regime Shifts In Temperate Forest Ecosystems: International Symposium In New Zealand, Tomas Veblen, Alan Tepley, Andres Holz

Joint Fire Science Program Research Project Reports

This project consisted of organizing and executing a one-day symposium on “Wildfire Regime Shifts in Temperate Forest Ecosystems” in conjunction with the triennial meeting of the Southern Connection Congress. The VIIth Southern Connection Congress drew together more than 350 environmental scientists and resource managers for its triennial meeting in Dunedin, New Zealand from January 25 to 30, 2013. The Southern Connection Congress (SCC) is a meeting of interdisciplinary researchers and natural resource managers who are interested in the biota and ecosystems of the temperate latitudes of the southern hemisphere. Attendees are from a wide range of research and professional disciplines …

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A National Study Of The Consequences Of Fire And Fire Surrogate Treatments, Phil Weatherspoon, Jim Agee, Phil Aune, Jim Baldwin, Jamie Barbour, Frank Beall, Julio Betancourt, Ralph Boerner, Matt Busse, Carl Edminster, Gary Fiddler, Carl Fiedler, Sally Haase, Kathy Harchsen, Mick Harrington, Ron Hodgson, Sue Husari, Jon Keeley, Mike Landram, Bill Laudenslayer, Jim Mciver, Dan Neary, Bill Otrosina, Roger Ottmar, Martin Ritchie, Kevin Ryan, Patrick Shea, Carl Skinner, Scott Stephens, Nate Stephensen, Elaine Kennedy Sutherland, Bob Vihanek, Dale Wade, Tom Waldrop, Dan Yaussy, Andy Youngblood, Steve Zack Jan 2012

A National Study Of The Consequences Of Fire And Fire Surrogate Treatments, Phil Weatherspoon, Jim Agee, Phil Aune, Jim Baldwin, Jamie Barbour, Frank Beall, Julio Betancourt, Ralph Boerner, Matt Busse, Carl Edminster, Gary Fiddler, Carl Fiedler, Sally Haase, Kathy Harchsen, Mick Harrington, Ron Hodgson, Sue Husari, Jon Keeley, Mike Landram, Bill Laudenslayer, Jim Mciver, Dan Neary, Bill Otrosina, Roger Ottmar, Martin Ritchie, Kevin Ryan, Patrick Shea, Carl Skinner, Scott Stephens, Nate Stephensen, Elaine Kennedy Sutherland, Bob Vihanek, Dale Wade, Tom Waldrop, Dan Yaussy, Andy Youngblood, Steve Zack

Joint Fire Science Program Research Project Reports

Many U.S. forests, especially those with historically short-interval, low- to moderate-severity fire regimes, are too dense and have excessive quantities of fuels. Widespread treatments are needed to restore ecological integrity and reduce the high risk of destructive, uncharacteristically severe fires in these forests. Among possible treatments, however, the appropriate balance among cuttings, mechanical fuel treatments, and prescribed fire is often unclear. For improved decisionmaking, resource managers need much better information about the consequences of alternative management practices involving fire and mechanicaVmanual "fire surrogates." Long-term, interdisciplinary research thus should be initiated to quantify the consequences and tradeoffs of alternative fire and …

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Phylogenetic Community Structure Of Aquatic Beetle Assemblages In A Multi-Wetland Experiment, Sandor Lawrence Kelly Jan 2012

Phylogenetic Community Structure Of Aquatic Beetle Assemblages In A Multi-Wetland Experiment, Sandor Lawrence Kelly

Electronic Theses and Dissertations

Phylogenetic Community Structure (PCS) metrics are becoming more common in community ecology. PCS metrics estimate the phylogenetic relatedness among members of an ecological community or assemblage. If ecological traits are conserved, then phylogenetic clustering (i.e., taxa are more closely related than expected by chance) indicates habitat filtering as the key process in community assembly. On the other hand, a pattern of phylogenetic overdispersion (i.e., taxa are more distantly related than expected by chance) suggests competition is dominant. Most studies to date have used PCS of unmanipulated ecosystems, but the value of PCS metrics will be best revealed in experiments. This …

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Long-Term Research On Biodiversity In West Khentey, Northern Mongolia, Michael Mühlenberg Jan 2012

Long-Term Research On Biodiversity In West Khentey, Northern Mongolia, Michael Mühlenberg

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Biodiversity is studied at ecosystem, community, and species level around Khonin Nuga, where the University Goettingen supports a research station since 15 years (established 1997 in cooperation with the National University of Mongolia). In that period 39 scientists have been involved and 67 students graduated with theses (7 PhD) about field work at that station. Inventories started at 1998 for several taxa and are now compiled in a book, which will be printed 2012 in Ulaanbaatar. It covers fungi, lichens, plants, several insect groups, spiders, crustaceans, and all vertebrate classes. For all taxa adequate experts proved the species lists. Because …

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First Stable Isotope Analysis Of Asiatic Wild Ass Tail Hair From The Mongolian Gobi, Micha Horacek, Petra Kaczensky, Merina Burnik Sturm Jan 2012

First Stable Isotope Analysis Of Asiatic Wild Ass Tail Hair From The Mongolian Gobi, Micha Horacek, Petra Kaczensky, Merina Burnik Sturm

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Stable isotope analysis has become a powerful tool to study feeding ecology, water use or movement pattern in contemporary, historic and ancient species. Certain hair and teeth grow continuously, and when sampled longitudinally can provide temporally explicit information on dietary regime and movement pattern. In an initial trial, we analysed a tail sample of an Asiatic wild ass (Equus hemionus) from the Mongolian Gobi. We found seasonal variations in H, C, and N isotope patterns, likely being the result of temporal variations in available feeds, water supply and possibly physiological status. Thus stable isotope analysis shows promise to …

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Widespread Triploidy In Western North American Aspen (Populus Tremuloides), Karen E. Mock, Colin M. Callahan, M. Nurul Islam-Faridi, John D. Shaw, Hardeep S. Rai, Stewart C. Sanderson, Carol A. Rowe, Ronald J. Ryel, Michael D. Madritch, Richard S. Gardner, Paul G. Wolf Jan 2012

Widespread Triploidy In Western North American Aspen (Populus Tremuloides), Karen E. Mock, Colin M. Callahan, M. Nurul Islam-Faridi, John D. Shaw, Hardeep S. Rai, Stewart C. Sanderson, Carol A. Rowe, Ronald J. Ryel, Michael D. Madritch, Richard S. Gardner, Paul G. Wolf

Aspen Bibliography

No abstract provided.

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Riparian Understory Dynamics And Relationship To Dams On The Elwha River, Washington, Aaron J. Clausen Jan 2012

Riparian Understory Dynamics And Relationship To Dams On The Elwha River, Washington, Aaron J. Clausen

EWU Masters Thesis Collection

"Dams alter the dynamics inherent to river systems by displacing natural hydrologic and sediment regimes, which can fundamentally alter riparian ecosystem function. However, with better understanding of how dams negatively impact river systems, and as many dams approach the end of their lifespan, dam removal is being used to facilitate ecosystem restoration. Whereas researchers have successfully illustrated the negative impacts dams have on biological communities, the long-term ecological implications of dam removal are not well understood. At present, two dams are being removed along the Elwha River (Washington, USA), providing a valuable window for ecological studies concerning the effects of …

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Externally-Expressed Fluorescence Across Sexes, Life Stages, And Species Of Spiders, Erin Brandt Jan 2012

Externally-Expressed Fluorescence Across Sexes, Life Stages, And Species Of Spiders, Erin Brandt

Dissertations and Theses

Although all spiders possess fluorophores in their hemolymph, the expression of external fluorescence is much more restricted. The purpose of this study was to evaluate differences in externally-expressed fluorescence between sexes, life stages, and species of spiders. To approach this question, we developed novel instrumentation to capture fluorescence with photographs of our specimens. We paired these fluorescence measurements with spectrometer measurements to attempt to determine the role that fluorescence plays in the overall coloration in spiders. The study was divided into four sections. First, we examined how fluorescence varies in sexes and life stages in Misumena vatia, an ambush predator …

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Reflections On Plant And Soil Nematode Ecology: Past, Present And Future, Howard Ferris, Bryan S. Griffiths, Dorota L. Porazinska, Thomas O. Powers, Koon-Hui Wang, Mario Tenuta Jan 2012

Reflections On Plant And Soil Nematode Ecology: Past, Present And Future, Howard Ferris, Bryan S. Griffiths, Dorota L. Porazinska, Thomas O. Powers, Koon-Hui Wang, Mario Tenuta

Department of Plant Pathology: Faculty Publications

The purpose of this review is to highlight key developments in nematode ecology from its beginnings to where it stands today as a discipline within nematology. Emerging areas of research appear to be driven by crop production constraints, environmental health concerns, and advances in technology. In contrast to past ecological studies which mainly focused on management of plant-parasitic nematodes, current studies reflect differential sensitivity of nematode faunae. These differences, identified in both aquatic and terrestrial environments include response to stressors, environmental conditions, and management practices. Methodological advances will continue to influence the role nematodes have in addressing the nature of …

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Associations Between Serum Concentrations Of Polychlorinated Biphenyls, Serum Carotenoids, And The Probability Of Metabolic Syndrome In The National Health And Nutrition Examination Survey 2003-2004, Carolyn R. Hofe Jan 2012

Associations Between Serum Concentrations Of Polychlorinated Biphenyls, Serum Carotenoids, And The Probability Of Metabolic Syndrome In The National Health And Nutrition Examination Survey 2003-2004, Carolyn R. Hofe

Theses and Dissertations--Nutritional Sciences

Diabetes and cardiovascular disease are leading causes of death and disability in the United States. These chronic diseases are clinical sequelae of metabolic syndrome (MetS), a condition that affects approximately one-third (1/3) of American adults. Metabolic syndrome occurs in response to environmental and genetic influences, among them food intake, a sedentary lifestyle, BMI, advancing age, and exposure to persistent organic pollutants (POPs). POPs are known to cause endocrine disruption and PCBs cause oxidative stress, disrupt endothelial cell integrity, and promote atherosclerosis. Nutrition plays a significant role in the prevention and management of these chronic diseases and has been shown to …

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Reproductive Biology Of Ludwigia Leptocarpa And L. Adscendens Subsp. Diffusa In Ile Ife, Nigeria, Matthew Oziegbe, Julius Olaoye Faluyi Jan 2012

Reproductive Biology Of Ludwigia Leptocarpa And L. Adscendens Subsp. Diffusa In Ile Ife, Nigeria, Matthew Oziegbe, Julius Olaoye Faluyi

Turkish Journal of Botany

Ludwigia L. (Onagraceae) species are known to be invasive in most parts of the world, serving as a threat to native plant species and blocking navigational channels. In Africa, they block waterways and are serious weeds in wet fields, most especially in rice paddies. The floral morphology, mode of sexual reproduction, and mechanism of fruit dispersal in water of L. leptocarpa (Nutt.) H.Hara and L. adscendens (L.) H.Hara subsp. diffusa (Forssk.) P.H.Raven were assessed in the Department of Botany of Obafemi Awolowo University, Ile Ife, Nigeria, from March 2006 to March 2009. L. leptocarpa produced cylindrical, hairy fruits of 34.80 …

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In Vitro Plant Regeneration Via Petiole Callus Of Viola Patrinii And Genetic Fidelity Assessment Using Rapd Markers, Gururaj Chalageri, Uddagiri Venkanna Babu Jan 2012

In Vitro Plant Regeneration Via Petiole Callus Of Viola Patrinii And Genetic Fidelity Assessment Using Rapd Markers, Gururaj Chalageri, Uddagiri Venkanna Babu

Turkish Journal of Botany

Viola patrinii DC. (Violaceae) petiole explants were used for inducing calli. Significant callus proliferation was observed on MS medium supplemented with 16.12 \muM NAA and 13.33 \muM BA. Shoot regeneration was achieved upon transferring the green friable calli to MS medium with a 2-fold dilution of potassium dihydrogen phosphate supplemented with 23.25 \muM Kn and 2.68 \muM NAA. Maximum shoot regeneration was achieved in 4 weeks. Multiple shoots were separated and further cultured in half-strength MS medium supplemented with 9.85 \muM IBA with 2% sucrose. Profuse root development was observed after 20-25 days of culturing. Regenerated plants were successfully transferred …

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Anatomical Analysis Of Red Juniper Leaf (Juniperus Oxycedrus) Taken From Kopaonik Mountain, Serbia, Predrag Spasoje Vasic, Darko Vlajko Dubak Jan 2012

Anatomical Analysis Of Red Juniper Leaf (Juniperus Oxycedrus) Taken From Kopaonik Mountain, Serbia, Predrag Spasoje Vasic, Darko Vlajko Dubak

Turkish Journal of Botany

In this study, the anatomical characteristics of Juniperus oxycedrus (Cupressaceae) leaves from Kopaonik Mountain (Serbia) are analysed. The level of distinction between leaves taken from various altitudes (420-1420 m) was determined by analysing anatomical characters. The clear correlation between increase in altitude and change in anatomical characters of the leaves was not established by descriptive analysis. The leaves collected from plants growing at 620 m had the most prominent xeromorphic characteristics (thick cuticles and thick epidermis walls). The discriminant canonical analysis also showed a clear distinction between red common juniper from 420 m and the samples taken from different altitudes.

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Seasonal Variations In Phytoplankton Communities In Zayandeh-Rood Dam Lake (Isfahan, Iran), Masoumeh Shams, Saeed Afsharzadeh, Tahi̇r Atici Jan 2012

Seasonal Variations In Phytoplankton Communities In Zayandeh-Rood Dam Lake (Isfahan, Iran), Masoumeh Shams, Saeed Afsharzadeh, Tahi̇r Atici

Turkish Journal of Botany

Variations in the phytoplankton of Zayandeh-Rood Dam Lake were studied seasonally from September 2005 to August 2006 at 4 different stations. A total of 112 species and 53 genera belonging to 6 divisions were identified. The species belonging to Bacillariophyta, Chlorophyta, Cyanophyta, Euglenophyta, and Dinophyta were found frequently. Chrysophyta species were found in low numbers. Cyclotella meneghinina Kütz., a centric diatom, was the dominant species at all stations. The density of the phytoplankton was between 470 and 150,470 cells/cm^3. According to the Shannon-Weaver Index, the highest and the lowest diversities were determined in November and May, respectively. Regarding physico-chemical analysis …

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Distribution Of Aquatic Oligochaetes (Annelida, Clitellata) Of High-Elevation Lakes In The Eastern Black Sea Range Of Turkey, Seray Yildiz, Murat Özbek, Mustafa Ruşen Ustaoğlu, Haşi̇m Sömek Jan 2012

Distribution Of Aquatic Oligochaetes (Annelida, Clitellata) Of High-Elevation Lakes In The Eastern Black Sea Range Of Turkey, Seray Yildiz, Murat Özbek, Mustafa Ruşen Ustaoğlu, Haşi̇m Sömek

Turkish Journal of Zoology

Many large and small lakes of varying depths are present in the Eastern Black Sea Range of Turkey, the nation's third most important glacial region following the Ağrı and Cilo-Sat mountain ranges. During the present study, 6 expeditions to collect aquatic oligochaetes from these lakes were conducted in July and August of 2005, 2006, and 2007; qualitative and quantitative samples were collected from 59 glacial lakes. We present and analyze the dominancy and distribution of aquatic oligochaete assemblages and their relation to environmental factors (temperature, dissolved oxygen, pH, electrical conductivity, salinity, turbidity, PO_4^{-3}-P, HCO_3^{-}, organic carbon, hardness, Ca^{2+}, Mg^{2+}, Si, …

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Additional Notes On The Spider Fauna Of Turkey (Araneae), Kadi̇r Buğaç Kunt, Rahşen Saltanat Kaya, Recep Sulhi̇ Özkütük, Tarik Danişman, Ersen Aydin Yağmur, Mert Elveri̇ci̇ Jan 2012

Additional Notes On The Spider Fauna Of Turkey (Araneae), Kadi̇r Buğaç Kunt, Rahşen Saltanat Kaya, Recep Sulhi̇ Özkütük, Tarik Danişman, Ersen Aydin Yağmur, Mert Elveri̇ci̇

Turkish Journal of Zoology

This paper presents the results of recent field surveys and provides new data on the spider fauna of Turkey. The following 9 taxa are new records for Turkey: Larinia chloris (Audouin, 1826); Macrothele sp.; Arctosa tbilisiensis Mcheidze, 1946; Pisaura consocia (O. P.-Cambridge, 1872); Prodidomus redikorzevi Spassky, 1940; Macaroeris flavicomis (Simon, 1884); Scytodes velutina Heineken & Lowe, 1832; Achaeridion conigerum (Simon, 1914); and Phoroncidia paradoxa (Lucas, 1846). New locality data are provided for the following previously but rarely recorded species: Spermophora senoculata (Dugès, 1836); Ariadna insidiatrix Audouin, 1826; and Segestria senoculata (Linnaeus, 1758). Taxonomic, zoogeographical, and ecological data are given for …

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Population Estimate Of Chinese Mystery Snail (Bellamya Chinensis) In A Nebraska Reservoir, Noelle M. Chaine, Craig R. Allen, Kent A. Fricke, Danielle M. Haak, Michelle L. Hellman, Robert A. Kill, Kristine T. Nemec, Kevin L. Pope, Nicholas A. Smeenk, Bruce J. Stephen, Daniel R. Uden, Kody M. Unstad, Ashley E. Vanderham Jan 2012

Population Estimate Of Chinese Mystery Snail (Bellamya Chinensis) In A Nebraska Reservoir, Noelle M. Chaine, Craig R. Allen, Kent A. Fricke, Danielle M. Haak, Michelle L. Hellman, Robert A. Kill, Kristine T. Nemec, Kevin L. Pope, Nicholas A. Smeenk, Bruce J. Stephen, Daniel R. Uden, Kody M. Unstad, Ashley E. Vanderham

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

The Chinese mystery snail (Bellamya chinensis) is an aquatic invasive species in North America. Little is known regarding this species’ impacts on freshwater ecosystems. It is believed that population densities can be high, yet no population estimates have been reported. We utilized a mark-recapture approach to generate a population estimate for Chinese mystery snail in Wild Plum Lake, a 6.47-ha reservoir in southeast Nebraska. We calculated, using bias-adjusted Lincoln-Petersen estimation, that there were approximately 664 adult snails within a 127 m2 transect (5.2 snails/m2). If this density was consistent throughout the littoral zone (depth) of …

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Survey Of The Native And Nonnative Vascular Plant Species Of Three Islands In Lake Winnipesaukee, New Hampshire, Mark Gardner Winkler Jan 2012

Survey Of The Native And Nonnative Vascular Plant Species Of Three Islands In Lake Winnipesaukee, New Hampshire, Mark Gardner Winkler

Electronic Theses and Dissertations

This study examined the long-term patterns in vascular plant composition on three islands in Lake Winnipesaukee, NH. It also tested the role of island biogeography in ecology as it analyzed the effectiveness of a land use plan implemented on the islands. Samplings were made on the islands in the summer of 2011 and were compared to earlier samplings in 1978, 1991, and 2001. The flora was observed and measured in 25 permanent plots that were established on the three islands in 1978. The understory flora was measured by presence and percent cover and the overstory was measured by frequency and …

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Molecular Mechanisms Regulating Chronological Aging And Cell Death In The Toxic Dinoflagellate, Karenia Brevis, Jillian Grace Johnson Jan 2012

Molecular Mechanisms Regulating Chronological Aging And Cell Death In The Toxic Dinoflagellate, Karenia Brevis, Jillian Grace Johnson

MUSC Theses and Dissertations

The toxic dinoflagellate, Karenia brevis, forms nearly annual blooms in the Gulf of Mexico that persist for many months in coastal waters, causing extensive marine animal mortalities and human health impacts. The molecular mechanisms that contribute to cell survival in high density, low growth blooms, and the mechanisms leading to often rapid bloom demise are not well understood. The studies presented in this dissertation investigate the existence and involvement of a programmed cell death-like (PCD-like) pathway in the demise of K. brevis cultures following oxidative stress and chronological aging. Firstly, to gain an understanding of the molecular processes that underlie …

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The Sign And Strength Of Plant-Soil Feedback For The Invasive Shrub, Lonicera Maackii, Varies In Different Soils, Kelly Schradin, Don Cipollini Jan 2012

The Sign And Strength Of Plant-Soil Feedback For The Invasive Shrub, Lonicera Maackii, Varies In Different Soils, Kelly Schradin, Don Cipollini

Biological Sciences Faculty Publications

Plants alter soil characteristics causing changes in their subsequent growth resulting in positive or negative feedback on both their own fitness and that of other plants. In a greenhouse study, we investigated whether the sign and strength of feedback changed across two distinct soil types, and whether effects were due to shifts in biotic or abiotic soil traits. Using soils from two different locations, we examined growth of the exotic invasive shrub, Lonicera maackii and the related native shrub, Diervilla lonicera, in unconditioned soils and in soils conditioned by previous growth of L. maackii, D. lonicera, and …

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Early Growth Of Three Kingfish (Menticirrhus) Species Found In Coastal Waters Of The Northern Gulf Of Mexico, E. John Anderson, Bruce H. Comyns, Harriet Perry, Chet F. Rakocinski Jan 2012

Early Growth Of Three Kingfish (Menticirrhus) Species Found In Coastal Waters Of The Northern Gulf Of Mexico, E. John Anderson, Bruce H. Comyns, Harriet Perry, Chet F. Rakocinski

Gulf and Caribbean Research

Southern kingfish (Menticirrhus americanus), gulf kingfish (M. littoralis), and northern kingfish (M. saxatilis) are members of the drum family (Sciaenidae) that are widespread in coastal habitats of the western Atlantic, including in the Gulf of Mexico (GOM). Despite their economic and ecological importance, little is known about growth of young kingfish. Young kingfish were collected from four different Mississippi shoreline habitats in 2005 and 2006; two associated with barrier islands and two along the mainland. Barrier island habitats included surf zones on the south shore and grass beds on the north shore. Mainland habitats …

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New Geographic Distribution Records For Centipedes (Chilopoda: Scolopendromorpha) In Arkansas, Including The First From Crowley's Ridge And The Grand Prairie, C. T. Mcallister, H. W. Robison, L. C. Thompson, M. B. Connior Jan 2012

New Geographic Distribution Records For Centipedes (Chilopoda: Scolopendromorpha) In Arkansas, Including The First From Crowley's Ridge And The Grand Prairie, C. T. Mcallister, H. W. Robison, L. C. Thompson, M. B. Connior

Journal of the Arkansas Academy of Science

No abstract provided.

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Stable Carbon Isotope Discrimination By Rubisco Enzymes Relevant To The Global Carbon Cycle, Amanda J. Boller Jan 2012

Stable Carbon Isotope Discrimination By Rubisco Enzymes Relevant To The Global Carbon Cycle, Amanda J. Boller

USF Tampa Graduate Theses and Dissertations

Five different forms of ribulose 1,5-bisphosphate carboxylase/oxygenase (RubisCO; IA, IB, IC, ID, II), the carboxylase of the Calvin-Benson-Bassham cycle (CBB), are utilized by plants, algae and autotrophic bacteria for carbon fixation. Discrimination against 13C by RubisCO is a major factor dictating the stable carbon isotopic composition (δ13C = {[13C/12C sample/13C/12C standard] - 1} X 1000) of biomass. To date, isotope discrimination, expressed as ε values (={[12k/13k] - 1} X 1000; 12k and 13k …

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Brunkow Studies Health Of Midwest Freshwaters, Aldemaro Romero Jr. Jan 2012

Brunkow Studies Health Of Midwest Freshwaters, Aldemaro Romero Jr.

Publications and Research

No abstract provided.

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Lepeophtheirus Salmonis, Parasitizing Three Species Of Pacific Salmon (Oncorhynchus Spp.): Host Variations In Load, Morphology, Fecundity, And Genetics Of The Salmon Louse, Stephen Flanagan Jan 2012

Lepeophtheirus Salmonis, Parasitizing Three Species Of Pacific Salmon (Oncorhynchus Spp.): Host Variations In Load, Morphology, Fecundity, And Genetics Of The Salmon Louse, Stephen Flanagan

EWU Masters Thesis Collection

"The purpose of this study is to determine biological parameters of salmon lice (Lepeophtheirus salmonis) as they parasitize different species of Pacific Ocean salmonids off the north Pacific coast of Washington State. Parasite load counts of L. salmonis were made and individuals were collected from salmonids in their natural environment. Louse morphology and fecundity were examined using microscopy. Parasite loads were equal between different species of salmonids (p = 0.231). Lice that infected chinook salmon (n= 48) were smaller in total body length (p < 0.001), cephalothorax length (p < 0.001), and cephalothorax width (p < 0.001) when compared to lice that infected coho salmon (n = 44) or pink salmon (n=45). Lice that infected coho and pink salmon were not statistically different in body length (p = 0.213), cephalothorax length (p = 0.996), or cephalothorax width (p = 0.149). Also, L. salmonis produced fewer eggs when infecting chinook salmon (n = 24) than when infecting coho salmon (p < 0.001) or pink salmon (p < 0.001). Whereas, lice that infected coho salmon (n = 41) or pink salmon (n = 22) produced similar number of eggs (p = 0.60). These results indicate that there are factors associated with infecting chinook salmon hosts that reduce the size and fecundity of salmon lice"--Document.

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Annual Variation In Timing, Orientation And Effects Of Weather On Jefferson Salamander (Ambystoma Jeffersonianum) And Spotted Salamander (Ambystoma Maculatum) Movements In Central Kentucky, Christopher James St. Andre Jan 2012

Annual Variation In Timing, Orientation And Effects Of Weather On Jefferson Salamander (Ambystoma Jeffersonianum) And Spotted Salamander (Ambystoma Maculatum) Movements In Central Kentucky, Christopher James St. Andre

Online Theses and Dissertations

Annual variation in temporal and spatial patterns of amphibian migration and dispersal are poorly understood. To address this issue, a circular drift fence was installed around an ephemeral pond at the Central Kentucky Wildlife Management Area, Madison County, Kentucky. The pond was checked daily for salamander movements from 17 January 2010 to 26 September 2010 and from 26 January 2011 to 3 August 2011, which corresponded to the activity season. Weather variables examined in relation to amphibian movements included barometric pressure, cumulative precipitation, temperature and relative humidity. Several species used the ephemeral pond during the study but few successfully reproduced. …

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