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  • Botany 2013 - Analyzing change in an urban New York Cityforest, species loss, invasions and methods of analysis
    in an urban New York Cityforest species loss invasions and methods of analysis Over the past forty years the forests of New York City have undergone drastic changes showing species losses an increase in invasive species and a significant change in the composition of many tree species Recent studies examining the flora and forest composition of two large urban forests in Queens County New York are presented here with a comparison of the present analysis with several prior studies performed over the previous four decades These results show drastic species losses of more than 40 in several groups the introduction of numerous invasive plant species and significant changes to the forest canopy tree species composition Species such as Cornus florida have shown significant drops in importance while more southerly species such as Liquidambar styraciflua have shown significant increases in importance These results can be attributed to many potential factors including higher human population density plant disease competition from invasives and a changing climate To assess such changes a modification of the traditional importance value is discussed allowing significance to be applied to the data Broader Impacts Log in to add this item to your schedule 1 Farmingdale State College Biology

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=928 (2016-02-01)
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  • Botany 2013 - Analyzing Sequence Variation: Barcodes to Genomes
    Schori Melanie 1 Lin Wei 2 Analyzing Sequence Variation Barcodes to Genomes DNA barcoding and phylogenetic reconstructions both depend on molecular data that exhibit appropriate levels of variation Ideally within species variation should be low while between species variation should be higher but not too high However intraspecific sequence variation of chloroplast gene regions is rarely discussed in the literature and no appropriate analysis technique is widely used We present a combination of analysis algorithms for assessing sequence variation in aligned datasets The first based on Hamming distance calculates within and between species variation and identifies sequences that are likely to be mislabeled The second which uses distribution distances determines how many informative positions exist for distinguishing pairs of species These results can then be pooled to assess genus level variation for the gene region of interest The algorithms can be applied to combined datasets and could be used to analyze genome level alignments to identify regions with levels of variation suitable for phylogenetic analyses Broader Impacts Log in to add this item to your schedule 1 Ohio University Environmental Plant Biology Porter Hall 315 Athens OH 45701 USA 2 Ohio University Mathematics Morton Hall 527 Athens OH 45701 USA

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=238 (2016-02-01)
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  • Botany 2013 - An annotated vascular flora and regional floristic analysis of The Nature Conservancy Davis Mountains Preserve, Jeff Davis County, Texas
    receives an annual precipitation between 28 and 57 cm with the majority occurring during the late summer monsoonal months between June through September This sky island ecosystem caters to the requirements that are needed to accommodate a wide range of vegetation patterns endemism and unique biodiversity Distinct vegetative zones include the Draw Desert Grassland exhibiting species found in grama tobosa and sacaton grassland associations dominating the lower elevations in Jeff Davis County The Montane Savannah sites between 1 747 and 2 469 m exhibit characteristics of the montane woodland associations such as the juniper pinyon oak and pine woodlands Dominant species of these forests include Juniperus deppeana Quercus grisea Q gravesii Q hypoleucoides Pinus cembroides P ponderosa and P strobiformis The current study began in May of 2011 and aimed to catalogue the entire vascular flora of the 32 000 acres of Nature Conservancy property south of Highway 118 and directly surrounding Mount Livermore Many sampling areas were selected according to their intricacy of topography resulting in likely unique but unvisited microhabitats such as deep sinuous canyons and the tops of higher peaks Previous botanical investigations are presented as well as biogeographic relationships of the flora The numbers from herbaria

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=280 (2016-02-01)
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  • Botany 2013 - Anatomical characterization of warts on <em>Scaphosepalum </em>(Orchidaceae: Pleurothallidinae)
    Carlsward Barbara 2 Anatomical characterization of warts on Scaphosepalum Orchidaceae Pleurothallidinae In pleurothallid orchids warts can be found on different plant parts like the cauline sheaths bracts or leaves and have been documented in Scaphosepalum Teagueia Dresslerella and Porroglossum and they In the genus Scaphosepalum the presence of well developed warts on the peduncles and pedicels has been a diagnostic character of the section Scaphosepalum The anatomical characterization of warts was conducted in different plants parts and different Scaphosepalum species with the objective to assess their homology We found that warts are formed by an aggregation of parenchyma with a sunken glandular hair or stomata and for this reason warts on inflorescences and pedicels of different species were considered homologous Character reconstruction was performed using maximum likelihood and the molecular based tree topology Based on the character reconstructions the section Scaphosepalum is paraphyletic because it includes all the warty Scaphosepalum species with exception of S dalstroemii and S bicristatum Broader Impacts Log in to add this item to your schedule Related Links Phylogeny of Scaphosepalum 1 University of Florida Florida Museum of Natural History Gainesville FL 32611 USA 2 Eastern Illinois University Department of Botany Life Sciences Bldg 2070 600

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=918 (2016-02-01)
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  • Botany 2013 - Anatomically preserved <em>Nilssoniopteris</em> (Bennettitales) from the Lower Cretaceous of Vancouver Island, British Columbia, Canada
    often implicated in the origin of flowering plants The extremely diverse Lower Cretaceous Valanginian flora of anatomically preserved plants at Apple Bay Vancouver Island Canada has yielded two types of bennettitalean seed cones Foxeoidea connatum and Williamsonia sp and two undescribed species of bennettitalean foliage One of the foliage species has an entire margin and represents a new species of the genus Nilssoniopteris Specimens are anatomically preserved in carbonate marine concretions and are exposed in both section and surface views Leaves are up to 1 5 cm wide with a distinctly corrugated adaxial surface a prominent midrib and lateral veins that fork rarely Venation of the midrib forms crescent shaped ring of collateral bundles with xylem oriented to the inside of the ring Lateral vein density ranges 12 15 per cm Laminae have an adaxial hypodermis one to two layers of palisade mesophyll spongy mesophyll toward abaxial epidermis a distinct bundle sheath and bundle sheath extensions Epidermal cells show prominently sinuous margins Leaves are hypostomatic with randomly arranged syndetocheilic stomata between veins on the abaxial surface This is only the second species of anatomically preserved Nilssoniopteris the only anatomically preserved species with an entire margin the first anatomically preserved species

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=1291 (2016-02-01)
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  • Botany 2013 - Anatomy and phytochemistry of the leaves of an endemic Brazilian species of <em>Aldama</em> (Asteraceae, Heliantheae)
    whose one of the purposes is to indentify anatomical characteristics that could help in the taxonomical resolution of these species Aldama grandiflora is an endemic Brazilian species which occurs in Cerrado areas Brazilian savannah Its representatives are from herbaceous to sub shrubs having a thickened underground stem with tuberous adventitious roots Samples were collected from one population in Brasilia DF and from two populations in Alto Paraíso de Goiás GO The first one is located at different latitude from the other two populations For the anatomical analysis fully expanded leaves were analyzed from three individuals per population and the samples were processed according to usual techniques in plant anatomy The essential oils were obtained by hydrodistillation in a Clevenger type apparatus analysed by gas chromatography coupled with mass spectrometry and the compounds were identified by comparing the mass spectra with library data An extraction was performed to each population The leaf is characterized by uniseriate epidermis with thickened outer walls enriched in pectins with straight cells walls from the front side view anomocytic stomata presence of three types of trichomes secretory ducts associated to the sheath extensions of the vascular bundles and to the phloem and hydathodes in the ornamentations of the leaf margins The distribution of the secretory ducts varied among the individuals into the population and also among the populations Histochemical tests detected the presence of lipophilic substances terpenes pectin mucilage and phenolic compounds mainly in secretory ducts and trichomes The analysis of essential oil showed differences amongst populations mainly in compounds of lower relative percentages and some compounds that were not reported to Aldama species before terpinolen δ amorphene globulol eudesmol and α eudesmol were identified The variations observed in the distribution of the secretory structures and in the chemical composition of the essential oil among the

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=116 (2016-02-01)
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  • Botany 2013 - Abstract Search
    Institutions Abstract Title Abstract Keywords Program Schedule Programs At A Glance Detailed Programs Custom Schedule Sessions Date Time Locations or Search Botany 2013 Home View Attendees Login Send Email Message From Name From Email To Leticia Onofre de Farias Subject Message Please type in the 5 characters between 0 and 9 and between A and F shown above and submit the form What is this for If the characters are

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=contactbyemail&id=165 (2016-02-01)
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  • Botany 2013 - An Australian origin for the <em>Pandanus tectorius</em> complex: a model for understanding speciation in ocean-dispersed Angiosperms.
    floating fruit and several key innovations including a multi seeded propagule and facultative apomixis appear to have contributed to the geographic success of the group The number of species in the complex however has long been a subject of debate Over 300 taxa have been ascribed to the complex however most have been synonymized with just two widespread species A poor understanding of factors that contribute to the isolation of populations of ocean dispersed angiosperms and the subsequent formation of new species has contributed to the taxonomic problem A Bayesian phylogeny was constructed using chloroplast and nuclear markers with representative species from all Pandanus subgenera and numerous putative taxa from the P tectorius complex The complex is nested within a clade of 15 Australian species of subg Pandanus This clade initially diverged into two geographically separated adaptive radiations one in the Northern Territory and another in coastal north Queensland The P tectorius complex originated in the Pliocene as part of the north Queensland radiation and has spread and diversified across the Indo Pacific from coastal Africa to Hawaii Mechanisms promoting divergence within the group include isolation driven by the patterns of ocean currents and secondary dispersal away from coastal populations

    Original URL path: http://www.2013.botanyconference.org/engine/search/index.php?func=detail&aid=217 (2016-02-01)
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