Angelo State University
Permanent URI for this collectionhttps://hdl.handle.net/2249.1/9389
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Browsing Angelo State University by Author "Amos, Bonnie B."
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Item Phylogenetic relationships of five members of the family Vespertilionidae (Chiroptera) from Malaysian Borneo(2013-05-24) Pacheco, Pablo Ricardo Rodriguez; Pacheco, Pablo Ricardo Rodriguez; Ammerman, Loren K.; Dowler, Robert C.; Amos, Bonnie B.; Braden, Heather; Angelo State University. Department of Biology.Several studies have been conducted to refine the historically unclear phylogeny of chiropterans within the family Vespertilionidae. However, the phylogenetic affinities of some taxa remain poorly resolved. My objective was to clarify the classification and phylogenetic affinities of five species (Pipistrellus petersi, Glischropus tylopus, Hesperoptenus tomesi, Philetor brachypterus, and Arielulus cuprosus) using DNA sequence data from the 12S rRNA mitochondrial gene and RAG2 nuclear gene. A total of 587 nucleotides of the 12S rRNA gene were aligned for 35 taxa, and for nuclear marker RAG2, 1231 nucleotides were aligned for 40 taxa. I performed maximum likelihood and Bayesian inference phylogenetic analyses on these taxa. Although resolution was poor overall, A. cuprosus and H. tomesi clustered with tribe Nycticeiini/Eptesicini, with Philetor brachypterus clustering with Hesperoptenus. Furthermore, Pipistrellus petersi clustered within the Hypsugine group instead of the predicted tribe Pipistrellini. Lastly, G. tylopus formed a polytomy with members of various tribes. There has been a uniform lack of resolution for this family in recent literature and the results presented here similarly provide unresolved relationships.Item The Pollination Ecology of Sclerocactus brevihamatus ssp. tobuschii (Cactaceae) in the Edwards Plateau Region of west-central TexasLangley, Lauren Ashley; Amos, Bonnie B.; Skipper, Ben R.; Clary, Karen H.; Brown, Jacqueline G.The Tobusch fishhook cactus (Sclerocactus brevihamatus ssp. tobuschii) (Cactaceae) is an endangered species endemic to the Edwards Plateau region of west-central Texas. This study’s objectives were to provide information on pollination ecology by comparing pollinator effectiveness among floral visitors and determining the breeding system and floral attraction system. Research was conducted on two field sites located in Kimble and Kerr Counties and on greenhouse specimens from Val Verde and Edwards Counties during the reproductive period (February-July) of 2014 and 2015. Honey bees (Apidae) were determined to be the most frequent and effective pollinators, followed by halictid bees (Halictidae). Fruit set results from pollination treatments and pollen-ovule (P/O) ratios support the reports from previous studies that this species is primarily self-incompatible. The flowers are protandrous with anther dehiscence occurring in the bud. Lastly, pollen was determined to be the primary floral reward.