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  • Botany & Mycology 2009 - Abstract Search
    modeling of species distributions is an increasingly powerful tool in the conservation and management of special status plant species Advances in quantitative methodologies have enabled more robust predictions of species occurrences and serve as a tool to monitor short and long term population change We used simulated and empirical data to test a chance of adequacy probability of occurrence approach to predict species distributions Data were obtained from publicly available Digital Elevation Models DEM regional climate databases and field collection A multi element chance based methodology of predictive modeling was applied to terrain and climate data using a grid based cellular automata approach Terrain features slope aspect elevation curvature and roughness and climatic elements temperature and precipitation were given chance of adequacy COA values from a simple classification matrix ranging from zero to one where zero indicated the element had no chance of adequacy and one was fully adequate GIS was used to examine input values on a cell by cell basis and assign values 0 to 1 based on pre defined chance matrices The chance values were subsequently multiplied to produce an aggregate chance of adequacy value for each grid cell in the model The result was a COA

    Original URL path: http://2009.botanyconference.org/engine/search/index.php?func=detail&aid=914 (2016-02-01)
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  • Botany & Mycology 2009 - Abstract Search
    north to tall volcanic mountains in the south central region to lowlands in the south as well as extensive coastlines Southern Mexico is the area where the temperate climate of North America unites with the tropical climate of Central and South America resulting in a highly diverse country the fourth most megadiverse country of the world with 131 ecoregions 75 terrestrial and 56 marine that supports an abundant biota including ascomycetes The mycological literature was reviewed for records of ascomycetes from Mexico which yielded 1 598 species plus 31 varieties forms for a total of 1 629 identified taxa of ascomycetes known from the country Of the 1 629 taxa only 54 are from aquatic environments 47 marine and 7 freshwater species Approximately 33 of genera and 38 of the species are lichenized The anamorphic ascomycetes were not included in this compilation Taxonomically these ascomycetes are arranged in 452 genera in 48 orders incertae sedis and 133 familes incertae sedis The Xylariales is the best studied group With regard to geographical distribution the most explored areas in the country are the States of Veracruz Mexico Oaxaca and the State of Chiapas located in the central southeast region of the country

    Original URL path: http://2009.botanyconference.org/engine/search/index.php?func=detail&aid=357 (2016-02-01)
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  • Botany & Mycology 2009 - Abstract Search
    any other name Evolutionary complexity in the New World myriopterid clade Pteridaceae The New World is host to a diversity of xeric adapted fern lineages that utilize a variety of morphological physiological and reproductive mechanisms to withstand seasonal drought Most of these desert ferns belong to a large 400 500 species globally distributed clade informally known as the cheilanthoids Many genera within this clade have recently been shown to be polyphyletic and species currently assigned to the genus Cheilanthes are scattered across the entire cheilanthoid phylogeny However there is one well supported subclade of Cheilanthes s l the myriopterids that encompasses most North American and a few South American species This subclade includes approximately 50 described taxa many of which are polyploid and notable for their tendency toward apomictic reproduction Reticulate evolution morphological homoplasy and cryptic species abound among myriopterid ferns complicating attempts to resolve relationships within the clade To provide additional insight on the evolution of this group we analyzed plastid trnG trnR atpA and rbcL and nuclear gapCp DNA sequences from a broad sample 80 of myriopterid taxa These data were used to generate a robust estimate of phylogenetic relationships within the group which sheds significant light on

    Original URL path: http://2009.botanyconference.org/engine/search/index.php?func=detail&aid=892 (2016-02-01)
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  • Botany & Mycology 2009 - Abstract Search
    a northern hardwood forest In attempt to define the autecological requirements necessary for Carex growth and to compare two sampling techniques we collected abiotic and biotic measures associated with 31 Carex species found at Glen Meal State Forest St Lawrence County New York In the summer of 2007 sedge densities were measured in one meter2 focal plots centered around each sedge a technique called Plant Centered Subjective Sampling PCSS An associated one meter2 plot was located ten meters from each focal plot In 2008 plots were sampled regularly at ten meter increments along one 1810 meter transect PCSS focal plots differed significantly from regular sampling plots for phosphorous pH and percent cover of living litter herbaceous species and gramminoid species However the associated plots ten meters removed from the PCSS focal plots resembled the plots sampled with regular placement in percent living cover litter and rock canopy cover percent cover of cryptogams herbaceous species and trees and shrubs Species richness for regular sampling plots was 15 whereas PCSS plots were found to have 28 species We found considerable similarity between PCSS and regular sampling plots for co occurrences of C novae anglei C gracillima C debilis and C communis in

    Original URL path: http://2009.botanyconference.org/engine/search/index.php?func=detail&aid=567 (2016-02-01)
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  • Botany & Mycology 2009 - Abstract Search
    Valerie 3 Nowak Michael D 1 A comprehensive estimation of divergence time for the Fungi and their coevolution with land plants Divergence time estimates for the Fungi have been plagued by the lack of taxon sampling and lack of phylogenetic resolution when more taxa were included but analyses were restricted to a single gene The number of species ranged from less than ten when based on many genes to less than 50 species when based on a single locus nuclear SSU rRNA gene Both caveats low taxon sampling with many genes and higher taxon sampling with one gene can greatly diminish the accuracy of divergence time estimates and led to drastically different estimates We estimated divergence time based on a data set of six gene regions for nearly 200 species using a Bayesian approach BEAST This sampling is a balanced representation of the fungal diversity with an emphasis on early diverging fungi Fungi as heterotrophs have developed a wide array of trophic interactions with plants ranging from symbiotrophic mutualistic to pathogenic to saprotrophic Therefore coevolutionary landmarks are expected when comparing plant and fungal phylogenies In light of our new results we will revisit various fungal divergence time estimates and determine

    Original URL path: http://2009.botanyconference.org/engine/search/index.php?func=detail&aid=701 (2016-02-01)
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  • Botany & Mycology 2009 - Abstract Search
    of Sir David Attenborough s Botany Teaching Strategy Sir David Attenborough of the BBC received critical acclaim for his contribution to the improvement of public understanding of plants His notable six video series entitled The Private Life of Plants is widely recognized as one of the most influential and captivating plant science television programs ever made Our research investigation asked Can a computer based text and visual analysis of the harvested content of that entire video series allow us to derive a descriptive and implementable model of Attenborough s botany teaching strategy Our systematic mixed methods study involved a coding transcribing and categorizing b qualitative quantitative comparison and c careful description of Attenborough s use of language and visual expository practices within this botanical video series Our model characterizes and quantifies how Attenborough selects words constructs and delivers sentences uses the active and passive voice integrates concepts across lessons employs metaphors creates compelling visual examples to teach science informally and enhances the public s aesthetic appreciation of plants Our model also reflects the opportunity albeit brief that we had to speak with Attenborough in November 2007 in London about the making of this series and its subsequent success The result

    Original URL path: http://2009.botanyconference.org/engine/search/index.php?func=detail&aid=82 (2016-02-01)
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  • Botany & Mycology 2009 - Abstract Search
    Movement in Plants Miller Nathan D 1 Durham Tessa L 2 Spalding Edgar 1 A Computer Vision Aided Study of Arabidopsis Seedling Root Gravitropism Darwin carefully studied plant growth and development with the best techniques of his day glass plates smudged with soot India ink marks and his exacting eye Computer vision today s method of choice has profoundly changed the game by adding precision objectivity repeatability and speed Electronic images of plants in motion are now captured by high resolution cameras and the developmental details are algorithmically extracted from the digital movies Gravitropism a model stimulus response system and the subject of this work lends itself well to this experimental approach Images of the Arabidopsis seedling root undergoing gravitropism were acquired every 2 min during a 10 h period with 5 µm resolution Tip angle rate of root elongation and root width as a function of time were automatically quantified Automation enabled a systematic grid of conditions seedling age media composition size of seed to be explored with many hundreds of trials Principal component analysis of the tip angle values showed trends in the gravitropic response across the condition grid K means clustering separated the population of responses into three classes with distinct time courses that also showed trends across the condition grid Wavelet analysis was used to calculate the velocity and acceleration of the tip angle for each of the hundreds of trials Patterns and relationships among the measured parameters resulted in a rich description of the wild type response and its plasticity Next this approach was used to compare the wild type response with that of a mutant lacking the Glutamate Receptor like 3 3 molecule This mutant displays defective ligand gated Ca2 fluxes in its root cells but no growth or development phenotype had been detected

    Original URL path: http://2009.botanyconference.org/engine/search/index.php?func=detail&aid=894 (2016-02-01)
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  • Botany & Mycology 2009 - Abstract Search
    Section McKnight Karl 1 Burnham Mark 1 Quinn Caitlin 1 Gerritsen Alida 1 A contribution towards understanding northern hardwood forest Carex ecology To better understand the autecology and synecology of 15 species of northern hardwood forest sedges we sampled 181 plots located in northern New York Sedge abundance was compared with incident light canopy cover soil chemical nutrients soil moisture and depth proximity to trees and cover of herbaceous and bryophyte species When compared with plots having sedges plots not having sedges were found to have more soil phosphorus potassium organic matter higher cation exchange capacity lower pH and higher soil moisture Plots having Eastern Hemlock near or in the plots also had fewer sedges The nine most abundant sedges C arctata C communis C debilis C gracillima C intumescens C laxiculmis C leptonervia C novae angliae and C pedunculata differed enough in our measurements of the chemical soil light and biotic parameters so as to be easily distinguishable in standard statistical ordinations such as non metric multidimensional scaling C communis and C novae angliae were found to be the most generalist species of the nine common sedges Closely related species within sections Hymenochlaenae and Acrocystis were also distinguishable by

    Original URL path: http://2009.botanyconference.org/engine/search/index.php?func=detail&aid=568 (2016-02-01)
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