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Articles 3661 - 3690 of 10753

Full-Text Articles in Botany

Challenges In Predicting The Future Distributions Of Invasive Plant Species, Chad C. Jones Nov 2012

Challenges In Predicting The Future Distributions Of Invasive Plant Species, Chad C. Jones

Botany Faculty Publications

Species distribution models (SDMs) are increasingly used to predict distributions of invasive species. If successful, these models can help managers target limited resources for monitoring and controlling invasive species to areas of high invasion risk. Model accuracy is usually determined using current species distributions, but because invasive species are not at equilibrium with the environment, high current accuracy may not indicate high future accuracy. I used 1982 species distribution data from Bolleswood Natural Area, Connecticut, USA, to create SDMs for two forest invaders, Celastrus orbiculatus and Rosa multiflora. I then used more recent data, from 1992 and 2002, as validation …

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Summaries Of Arkansas Cotton Research 2011, Derrick M. Oosterhuis Nov 2012

Summaries Of Arkansas Cotton Research 2011, Derrick M. Oosterhuis

Arkansas Agricultural Experiment Station Research Series

No abstract provided.

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Marketing Contracts, Overconfidence, And Timing In The Canadian Wheat Market, Fabio L. Mattos, Stefanie A. Fryza Nov 2012

Marketing Contracts, Overconfidence, And Timing In The Canadian Wheat Market, Fabio L. Mattos, Stefanie A. Fryza

Department of Agronomy and Horticulture: Faculty Publications

This paper investigates factors that impact marketing performance in the Canadian wheat market. Using data provided by the Canadian Wheat Board (CWB) for six crop years, results indicate that producers were not able to profitably use all marketing contracts offered by the CWB, earlier pricing tended to generate better performance, there was a negative relationship between activeness and performance (suggesting overconfidence in marketing skills), and performance was generally worse in volatile crop years. Further analysis reveals some of these findings differ when outperforming and underperforming producers are investigated separately, particularly with respect to activeness and volatility.

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Arkansas Corn And Grain Sorghum Performance Tests 2012, R. D. Bond, D. G. Dombek, J. A. Still, R. M. Pryor Nov 2012

Arkansas Corn And Grain Sorghum Performance Tests 2012, R. D. Bond, D. G. Dombek, J. A. Still, R. M. Pryor

Arkansas Agricultural Experiment Station Research Series

Corn and grain sorghum performance tests are conducted each year in Arkansas by the University of Arkansas System Division of Agriculture. The tests provide information to companies marketing seed within the state and aid the Arkansas Cooperative Extension Service in formulating recommendations for producers.

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Mccoy, Thomas N. (Sc 2635), Manuscripts & Folklife Archives Oct 2012

Mccoy, Thomas N. (Sc 2635), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2635. Bound typescript of paper by Thomas N. McCoy, Catlettsburg, Kentucky entitled “Sadie F. Price, 1849-1903,” Kentucky Botanist,” including typescripts of correspondence with Price about botany, and a collection of new clippings concerning Price.

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Review Of The Midwestern Native Garden: Native Alternatives To Nonnative Flowers And Plants, An Illustrated Guide By Charlotte Adelman And Bernard L. Schwartz, Stephen L. Young Oct 2012

Review Of The Midwestern Native Garden: Native Alternatives To Nonnative Flowers And Plants, An Illustrated Guide By Charlotte Adelman And Bernard L. Schwartz, Stephen L. Young

Great Plains Research: A Journal of Natural and Social Sciences (through 2013)

Native plants are important for maintaining biodiversity and supporting birds, mammals, and insects in a particular region. The interaction of plants with other organisms is what makes up food webs, and a shift in one will result in change in the other, change that is often detrimental to both. Invasive plant species, which include many nonnative types, can alter ecosystems with lasting effects on hydrology, nutrient cycling, and habitat. Similar to other regions, the Central Plains is increasingly threatened by the establishment of invasive plant species. The reintroduction of native plant species not only in large natural areas, but also …

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Monitoring Standing Herbage Of The Sands And Choppy Sands Ecological Vegetation Types In The Nebraska Sandhills, Daniel W. Uresk Oct 2012

Monitoring Standing Herbage Of The Sands And Choppy Sands Ecological Vegetation Types In The Nebraska Sandhills, Daniel W. Uresk

Great Plains Research: A Journal of Natural and Social Sciences (through 2013)

A modified Robel pole with white and gray alternating bands (2.54 cm) was used to measure vegetation on sands and choppy sands ecological types in the Sandhills of Nebraska. Objectives were to determine the relationship between visual obstruction readings (VOR) and clipped standing herbage, develop guidelines for monitoring standing herbage, and provide sample size estimates. Visual obstruction measurements of standing herbage were linear, and regression coefficients were significant (P< 0.001) for 125 transects (R2 = 0.60, SE = 496 kg/ha). Clipped standing herbage ranged from 293 to 4389 kg/ha with a mean of 1,559 kg/ha. A minimum of four transects (20 stations/transect with four …

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Initial Changes In Species Cover Following Savanna Restoration Treatments In Western Iowa, David A. Mckenzie, Thomas B. Bragg, David M. Sutherland Oct 2012

Initial Changes In Species Cover Following Savanna Restoration Treatments In Western Iowa, David A. Mckenzie, Thomas B. Bragg, David M. Sutherland

Great Plains Research: A Journal of Natural and Social Sciences (through 2013)

Study areas in the Iowa Loess Hills were used to evaluate short-term responses of understory species to three treatment methods designed to facilitate restoration of Quercus macrocarpa savanna. Treatments included burning alone, burning with thinning, and burning with clear-cutting. Plant abundance and diversity were compared before treatment and one year after treatment. Ninety-nine plant species were identified during the study, of which 40 were new following treatment, although most of these were forest associates. Increases in diversity of understory species were observed after treatment, particularly in plots with combined burning and thinning. The forb group was most consistent in response …

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Sfa Gardens Newsletter, Fall 2012, Sfa Gardens, Stephen F. Austin State University Oct 2012

Sfa Gardens Newsletter, Fall 2012, Sfa Gardens, Stephen F. Austin State University

SFA Gardens Newsletters

No abstract provided.

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Evolution On The Hawaiian Hotspot: Biogeography And Divergence Time Estimation Of Kadua (Rubiaceae), Kenneth L. Parker Oct 2012

Evolution On The Hawaiian Hotspot: Biogeography And Divergence Time Estimation Of Kadua (Rubiaceae), Kenneth L. Parker

Biological Sciences Theses & Dissertations

Recent studies on the colonization time of Hawaiian plant and animal lineages have suggested certain lineages arrived to the archipelago before the formation of the extant islands. Kadua, a recently resurrected genus, is mostly endemic to the Hawaiian Archipelago, with many member taxa autochthonous to individual islands. This work investigates the colonization time of Kadua to the Hawaiian Islands. Sequence analyses of the quickly evolving nuclear regions ITS, ETS and 5s-NTS regions for 20 Hawaiian and 7 French Polynesian species of Kadua were used to create dated phylogeny calibrated with island ages. The phylogeny suggests a single colonization of Hawaii …

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Naturalization Of Sequoiadendron Giganteum (Cupressaceae) In Montane Southern California, Rudolf Schmid, Mena Schmid Sep 2012

Naturalization Of Sequoiadendron Giganteum (Cupressaceae) In Montane Southern California, Rudolf Schmid, Mena Schmid

Aliso: A Journal of Systematic and Floristic Botany

After the August 1974 fire in the upper Hall Canyon area on the southwestern flank of Black Mountain in the northwestern San Jacinto Mountains, Riverside County, California, the United States Forest Service revegetated the burn in the mixed-conifer forest with the Sierra Nevada endemic Sequoiadendron giganteum (Cupressaceae). On 1 May 2009 a GPS census starting at the head of Hall Canyon revealed both in the canyon and upslope beyond it at least 157 individuals in the vicinity of the Black Mountain Trail, plus an outlier 450 m distant near the summit. This species alien to southern California is regenerating prolifically …

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Euphorbia (Subgen. Chamaesyce Sect. Anisophyllum) Jaegeri, A Shrubby New Species From The Deserts Of California, United States, Victor W. Steinmann, James M. André Sep 2012

Euphorbia (Subgen. Chamaesyce Sect. Anisophyllum) Jaegeri, A Shrubby New Species From The Deserts Of California, United States, Victor W. Steinmann, James M. André

Aliso: A Journal of Systematic and Floristic Botany

Euphorbia jaegeri (Euphorbiaceae), an endemic to southeastern California, United States, is described as new and illustrated with photographs. It is known from two general locations, one in the Orocopia Mountains (Riverside County) and the other in the Marble Mountains and adjacent Bristol Mountains (San Bernardino County). The habitat is desert scrub on rocky hillsides and along arroyos, primarily in rock crevices or gravelly soils, at elevations from approximately 600 to 850 m. The new species belongs to Euphorbia subgen. Chamaesyce sect. Anisophyllum. It is distinguished by the combination of a shrubby habit and involucral appendages that are deeply parted …

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Cover Page Sep 2012

Cover Page

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

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A Revision Of Erythranthe Montioides And Erythranthe Palmeri (Phrymaceae), With Descriptions Of Five New Species From California And Nevada, Usa, Naomi S. Fraga Sep 2012

A Revision Of Erythranthe Montioides And Erythranthe Palmeri (Phrymaceae), With Descriptions Of Five New Species From California And Nevada, Usa, Naomi S. Fraga

Aliso: A Journal of Systematic and Floristic Botany

The genus Erythranthe (Phrymaceae) continues to be a source of floristic novelty, especially in the American West, as evidenced by recent discoveries presented here. Two species in Erythranthe section Paradantha (E. montioides and E. palmeri) have long been a source of taxonomic confusion. Recent research reveals that a total of ten species have previously been treated as part of these two species. Here I present a revised taxonomy for E. montioides and E. palmeri including clarification of species circumscriptions (E. montioides, E. palmeri), recognition of three species that have previously been treated as synonyms …

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Wood Anatomy Of Gnetales In A Functional, Ecological, And Evolutionary Context, Sherwin Carlquist Sep 2012

Wood Anatomy Of Gnetales In A Functional, Ecological, And Evolutionary Context, Sherwin Carlquist

Aliso: A Journal of Systematic and Floristic Botany

New scanning electron microscope (SEM) and light microscope data and illustrations are presented in order to compare hydraulic adaptations of non-gnetalean conifers and angiosperms to relevant wood features of Gnetales. Gnetales have essentially all of the adaptations of both groups, yet have not competed well, despite predating angiosperms in origin and radiation. Angiosperms may be advantaged more by life cycle abbreviation and by heterochronic possibilities than by wood features. Wood features of Gnetales that relate to conduction (torus-margo differentiation of tracheid pit membranes, distribution of tori within the wood, perforation plate simplification, growth rings, vesturing, helical thickenings, and axial parenchyma) …

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Lafferty, Maude (Ward), 1869-1962 (Sc 2616), Manuscripts & Folklife Archives Sep 2012

Lafferty, Maude (Ward), 1869-1962 (Sc 2616), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2616. Typescript copies of "A Brief Sketch of Rafinesque and the Transylvania Botanic Garden" and the "Journal of Samuel Constantine Ranfiesque," by Maud (Ward) Lafferty, Lexington, Kentucky.

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Coombs, Elizabeth Robertson, 1893-1988 (Sc 2633), Manuscripts & Folklife Archives Sep 2012

Coombs, Elizabeth Robertson, 1893-1988 (Sc 2633), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2633. Original typescript of a Sarah "Sadie" Frances Price bibliography compiled by Elizabeth Robertson Coombs, Bowling Green, Kentucky.

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Arkansas Wheat Cultivar Performance Tests 2011-2012, R. E. Mason, R. G. Miller, J. P. Kelley, E. A. Milus Sep 2012

Arkansas Wheat Cultivar Performance Tests 2011-2012, R. E. Mason, R. G. Miller, J. P. Kelley, E. A. Milus

Arkansas Agricultural Experiment Station Research Series

Wheat cultivar performance tests are conducted each year in Arkansas by the Arkansas Agricultural Experiment Station, Department of Crop, Soil and Environmental Sciences. The tests provide information to companies developing cultivars and/or marketing seed within the state and aid the Arkansas Cooperative Extension Service in formulating cultivar recommendations for small-grain producers.

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Verbena Urticifolia L., Gordon C. Tucker Aug 2012

Verbena Urticifolia L., Gordon C. Tucker

Specimens by Name

No abstract provided.

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Verbena Urticifolia L., Gordon C. Tucker Aug 2012

Verbena Urticifolia L., Gordon C. Tucker

Specimens by Name

No abstract provided.

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Acer Negundo L., Wayne Longbottom Aug 2012

Acer Negundo L., Wayne Longbottom

Specimens by Name

No abstract provided.

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High School Horticulture Curriculum, Margaret Maratsos Aug 2012

High School Horticulture Curriculum, Margaret Maratsos

Horticulture and Crop Science

Horticulture is just one of the many topics covered in a high school agriculture curriculum, and yet, there are very few lesson plans or resources available to teachers for these classes specifically. The objectives of this project were to compile a set of lesson plans, lab plans, and tests that would emphasize interactive and investigative learning. The lesson plans were written in such a way that they reflected a certain set of standards, set down by the state of California, and were meant to serve as a bare outline of topics that would be discussed within a week’s worth of …

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B.R. Wells Rice Research Studies 2011, R. J. Norman, K.A. K. Moldenhauer Aug 2012

B.R. Wells Rice Research Studies 2011, R. J. Norman, K.A. K. Moldenhauer

Arkansas Agricultural Experiment Station Research Series

No abstract provided.

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Geographical Distribution And Survival Of Iris Yellow Spot Virus In Spiny Sowthistle, Sonchus Asper, In Georgia, Claudia Nischwitz Aug 2012

Geographical Distribution And Survival Of Iris Yellow Spot Virus In Spiny Sowthistle, Sonchus Asper, In Georgia, Claudia Nischwitz

All Current Publications

No abstract provided.

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Tcp Transcription Factor, Branch Angle Defective 1 (Bad1), Is Required For Normal Tassel Branch Angle Formation In Maize, Fang Bai, Renata Reinheimer, Diego Durantini, Elizabeth Kellogg, Robert Schmidt Jul 2012

Tcp Transcription Factor, Branch Angle Defective 1 (Bad1), Is Required For Normal Tassel Branch Angle Formation In Maize, Fang Bai, Renata Reinheimer, Diego Durantini, Elizabeth Kellogg, Robert Schmidt

Biology Department Faculty Works

In grass inflorescences, a structure called the “pulvinus” is found between the inflorescence main stem and lateral branches. The size of the pulvinus affects the angle of the lateral branches that emerge from the main axis and therefore has a large impact on inflorescence architecture. Through EMS mutagenesis we have identified three complementation groups of recessive mutants in maize having defects in pulvinus formation. All mutants showed extremely acute tassel branch angles accompanied by a significant reduction in the size of the pulvinus compared with normal plants. Two of the complementation groups correspond to mutations in the previously identified genes, …

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Sfa Gardens Newsletter, Summer 2012, Sfa Gardens, Stephen F. Austin State University Jul 2012

Sfa Gardens Newsletter, Summer 2012, Sfa Gardens, Stephen F. Austin State University

SFA Gardens Newsletters

No abstract provided.

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Closely Paired Flowers Produce Single Fruit, W. John Hayden Jul 2012

Closely Paired Flowers Produce Single Fruit, W. John Hayden

Biology Faculty Publications

Perhaps one of the most striking features of partridge berry (Mitchella repens), the 2012 VNPS Wildflower of the Year, is its closely paired flowers that yield a single berry fruit (figure 1). That these fruits are double structures, formed by pairs of flowers, is revealed in the presence of two discrete rings of five sepals each on the fruit apex, or in some cases, by a single ring of 10 sepals. Viewed in isolation, without context, the nature of these double fruits may seem perplexing, but as in so many things, a comparative perspective helps to make sense …

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Samolus Parviflorus Raf., Loy R. Phillippe Jun 2012

Samolus Parviflorus Raf., Loy R. Phillippe

Specimens by Name

No abstract provided.

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Five Nuclear Loci Resolve The Polyploid History Of Switchgrass (Panicum Virgatum L.) And Relatives, Jimmy Triplett, Yunjing Wang, Jinshun Zhong, Elizabeth Kellogg Jun 2012

Five Nuclear Loci Resolve The Polyploid History Of Switchgrass (Panicum Virgatum L.) And Relatives, Jimmy Triplett, Yunjing Wang, Jinshun Zhong, Elizabeth Kellogg

Biology Department Faculty Works

Polyploidy poses challenges for phylogenetic reconstruction because of the need to identify and distinguish between homoeologous loci. This can be addressed by use of low copy nuclear markers. Panicum s.s. is a genus of about 100 species in the grass tribe Paniceae, subfamily Panicoideae, and is divided into five sections. Many of the species are known to be polyploids. The most well-known of the Panicum polyploids are switchgrass (Panicum virgatum) and common or Proso millet (P. miliaceum). Switchgrass is in section Virgata, along with P. tricholaenoides, P. amarum, and P. amarulum, whereas P. miliaceum is in sect. Panicum. We have …

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Traversing Swanton Road, 9th Ed., James A. West Jun 2012

Traversing Swanton Road, 9th Ed., James A. West

Academic, Government & Associated Organizational Research Resources

Situated at the northwest end of Santa Cruz County and occupying circa 30 square miles of sharply contrasted terrain, the Scott Creek Watershed concentrates within its geomorphological boundaries, at least 10-12% of California's flora, both native and introduced. Paradoxically, the use/abuse that the watershed has sustained over the past 140+ years, has not necessarily diminished the biodiversity and perhaps parallels the naturally disruptive but biologically energizing processes (fire, flooding, landslides and erosion), which have also been historically documented for the area for +60 years. This is an early edition of an extensive document by James A. West. Please visit the …

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