Category: Article

Tags

    Published: December 17, 2012

    Species recognition in tropical lichen-forming fungi

    Stephanie Ware, Manager, Morphology Labs, SEM

    GABRIELLE LOPEZ

    Freshman Biology major at Roosevelt University

    REU Mentor: Dr. Thorsten Lumbsch (Associate Curator, Botany)

    Symposium Presentation Title: A Phylogenetic study of the genus Lecanora (Fungi: Ascomycota: Lecanoromycetes: Lecanorales)

    Symposium Presentation Abstract: Species recognition in lichen-forming fungi is difficult at best when considering the different methods used in classification.  Historically, chemical and morphological characters are implemented to produce phylogeny.  In this study, a phylogenetic tree of the genus Lecanora is produced using morphological and molecular data.  Techniques that were applied include DNA extraction, PCR amplification, gel electrophoresis, DNA sequencing, and alignment.  Analysis of the molecular data was performed using Garle.  The tree positioned the specimens in the group subfusca, which was supported with bootstrap analysis.  Morphological characters of the specimens were studied and photographed to confirm placement on the tree.  This study could be improved by incorporating more genes in the analysis, along with morphological characters for all taxa.  The integration of morphological and molecular data, like those used in this study, could lead to a more complete phylogenetic tree of the lichen genus Lecanora.

    Original Project Description: Fungi that form stable symbioses with photosynthetic partners (algae or cyanobacteria) are called lichens. These organisms have a relative simple morphology and species recognition is difficult, especially in tropical taxa. These are often known from few collections and their variability is poorly known. Thus, some species have been repeatedly described from different continents, while in other cases the same name was applied to taxa that look similar, but maybe different species, sometimes not even closely related. Molecular data help to distinguish between intraspecific variability and distinct differences between isolated lineages. In a NSF supported project on the tropical lichen family Thelotremataceae, the species distinction of tropical crustose lichens is studied using morphological, chemical, and molecular data in an integrated approach.

    Research methods and techniques: REU participants in this project will receive training in molecular and organismal research methods. They will learn how important a combination of both methods is for an understanding of the diversity of life in tropical ecosystems. The training will include introduction to the literature, handling of herbarium specimens, microscopic examination of morphological characters, and chemical investigations, including thin-layer chromatography. Molecular methods will include DNA isolation, PCR and subsequent direct sequencing of certain gene regions. Subsequently, the analysis of DNA sequence data will be performed.

    Stephanie Ware
    Manager, Morphology Labs

    Stephanie started volunteering at the Field Museum in 1998, working with Curator John Bates in the Bird Division. In 1999, John Bates hired her as a research assistant. After that project finished in 2007, she went to work for Carl Dick in the Division of Insects helping him to complete his work on the museum's Bat Fly collection. She spent a great deal of time generating images for the Bat Fly portion of theDiptera Taxonomy Database. When Carl left for University of Kentucky in 2009, she continued her imaging work in the Insect Division. In the intervening years, she has imaged hundreds specimens, mostly types, from the rove beetle (Staphylinidae), ant and myriapoda collections.

    Stephanie began working with the Chicago Peregrine Program in 2006.  Initially, she monitored the Metropolitan Correctional Center nest in downtown Chicago.  Over time, her duties have expanded to include other nests in the metro region, emphasizing the identification of nesting adults.  In March of 2007, Stephanie created a group called Midwest Peregrine Falcons on the photo sharing website Flickr with the goal of providing a place for photographers across the country to submit their photographs of peregrine sightings in the Midwestern United States. She also has many of her own peregrine photos on Flickr as well.