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Articles 1 - 4 of 4
Full-Text Articles in Ecology and Evolutionary Biology
Impacts Of Two Introduced Ladybeetles, Coccinella Septempunctata And Harmonia Axyridis (Coleoptera: Coccinellidae), On Native Coccinellid Species At Mount St. Helens, Washington And In Southwestern Virginia, Catherine Marie Sheehy
Impacts Of Two Introduced Ladybeetles, Coccinella Septempunctata And Harmonia Axyridis (Coleoptera: Coccinellidae), On Native Coccinellid Species At Mount St. Helens, Washington And In Southwestern Virginia, Catherine Marie Sheehy
Masters Theses
To assess changes in coccinellid communities subsequent to the introduction of two non-native species, Coccinella septempunctata and Harmonia axyridis, ladybird numbers were monitored over a 20 year period at Mt. Saint Helens, Washington and in three years between 1996 and 2004 in southwestern Virginia. Surveys conducted at Mt. Saint Helens included pre- and post- invasion years for both non-natives. At Mt. Saint Helens, C. septempunctata and H. axyridis both increased in abundance, accompanied by declining numbers of the native ladybird Adalia bipunctata at one of the two Washington sites and of the native ladybird Coccinella transversoguttata at both sites. …
Clonality And Genetic Diversity Revealed By Aflps In Schisandra Glabra (Brickell) Rheder (Schisandraceae), A Rare Basal Angiosperm, Matthew J. Valente
Clonality And Genetic Diversity Revealed By Aflps In Schisandra Glabra (Brickell) Rheder (Schisandraceae), A Rare Basal Angiosperm, Matthew J. Valente
Masters Theses
Rare species with fragmented distributions often exhibit reduced levels of genetic diversity within populations. However, life history traits such as long lived perennial habit and outcrossing mating system, are associated with high levels of within species genetic variation being partitioned within populations. Schisandra glabra (Schisandraceae) is a rare basal angiosperm with a fragmented distribution across the southeastern US and in a disjunct population in cloudforest of Mexico. The species’ clonal reproduction by rhizomes, confounds the delineation of genetically distinct individuals in the field. The patterns of genetic diversity and clonality in 10 populations of S. glabra were investigated using AFLP …
Geographic And Temporal Diversification Patterns In The Barcheek Darter Species Group, Phillip Ray Hollingsworth Jr.
Geographic And Temporal Diversification Patterns In The Barcheek Darter Species Group, Phillip Ray Hollingsworth Jr.
Masters Theses
The purpose of this study was to investigate geographic and temporal diversification patterns in the barcheek darter species group. Specifically, my two questions were “Is there geographical structure of alleles or haplotypes within currently recognized species that is suggestive of unrecognized, or cryptic, species diversity within the clade?” (geographic diversification pattern) and “How old are inter- and intraspecific divergence events in the evolutionary history of the clade?” (temporal diversification pattern). A three gene dataset from 159 barcheek individuals of two mitochondrial coding regions, cyt b and ND2, along with a nuclear intron, S7, was analyzed using parsimony and Bayesian phylogentic …
Embryology Of Manekia Naranjoana (Piperaceae) And Its Implications For The Origin Of The Sixteen-Nucleate Female Gametophyte In Piperales, Tatiana Arias-Garzón
Embryology Of Manekia Naranjoana (Piperaceae) And Its Implications For The Origin Of The Sixteen-Nucleate Female Gametophyte In Piperales, Tatiana Arias-Garzón
Masters Theses
Piperaceae is unique among Piperales because it is the only tetrasporic group in the order and a great deal of diversity in the ontogenetic trajectories of the female gametophyte is found in its genera. The evolutionary developmental origin of the sixteen-nucleate female gametophyte remains unclear in the family until now. In Piperaceae, Manekia has been identified as sister to Zippelia, and this clade is sister to core Piperaceae (Piper, Peperomia). This research is the first attempt to understand the development of the female gametophyte of Manekia naranjoana in order to provide critical data on the origin of …