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Sponges Of The Caribbean: Linking Sponge Morphology And Associated Bacterial Communities, Ericka Ann Poppell
Sponges Of The Caribbean: Linking Sponge Morphology And Associated Bacterial Communities, Ericka Ann Poppell
Master's Theses
The ecological and evolutionary relationship between sponges and their symbiotic microflora remains poorly understood, which limits our ability to understand broad scale patterns in benthic-pelagic coupling on coral reefs. Previous research classified sponges into two different categories of sponge microbial associations: High Microbial Abundance (HMA) and Low Microbial Abundance (LMA) sponges. Choanocyte chamber morphology and density was characterized in representatives of HMA and LMA sponges using scanning electron microscopy from freeze-fractured tissue. Denaturing Gradient Gel Elextrophoresis was used to examine taxonomic differences among the bacterial communities present in a variety of tropical sponges. The results supported the hypothesis that choanocyte …
The Status Of Leptodactylus Validus As A Single Taxon And Its Relationship To Letptodactylus Pallidirostris, Kenneth Christopher Yanek
The Status Of Leptodactylus Validus As A Single Taxon And Its Relationship To Letptodactylus Pallidirostris, Kenneth Christopher Yanek
Master's Theses
Leptodactylus validus exhibits an unusual distribution inhabiting Trinidad, Tobago, and the Lesser Antilles, but not the mainland of South America. This distribution is inconsistent with other distribution patterns observed for these islands. Although slight variation in adult morphology has been observed among the island populations, call data suggest the presence of a single species. Calls of Leptodactylus pallidirostris from Venezuela suggested that this taxon might be conspecific with L. validus. Herein sequence data from the 12S and 16S mt rRNA genes were collected and analyzed in order to address: 1.) whether more than one species is represented within L. validus, …
Type Of Muscle Present In Adult Amphibian Lymphatic Heart Based On The Dna Sequence Of The Myosin Heavy Chain, Maribeth Morral
Type Of Muscle Present In Adult Amphibian Lymphatic Heart Based On The Dna Sequence Of The Myosin Heavy Chain, Maribeth Morral
Honors Theses
Water and plasma are forced from the capillaries into the interstitial fluid. This fluid is useful l as it moves materials between cells. Most of this fluid is collected in the capillarie of a second circulatory system, the lymphatic system. The first function of such a system is returning the excess blood plasma, now o as lymph, that has accumulated in the tissue spaces. Lymph flows from small lymph capillaries into lymph vessels that are similar to veins in having valves that prevent back flow. Lymph vessels collect to lymph nodes, lymph organs, or to the cardiovascular system at the …
Chondrocranial And Oral Morphology Of Leptodactylid Larvae, William Hagood Turner
Chondrocranial And Oral Morphology Of Leptodactylid Larvae, William Hagood Turner
Master's Theses
I focused my research on Leptodactylidae in order to determine the usefulness of chondrocranial and internal oral characters in systematic and phylogenetic studies of this anuran family. To achieve this goal, I examined the chondrocrania of eight species of the Leptodactylinae: Adenomera marmorata, Edalorhina perezi, Limnomedusa macroglossa, Physalaemus gracilis, P. henselii, P. pustulosus, Pleurodema brachyops, and P. tucumana. Furthermore, I analyzed and described the internal oral anatomy of Physalaeum us gracilis, P. henselii, and Limnomedusa macroglossa and the skeletogenesis of P. gracilis and P. pustulosus. Subsequently, I integrated these data with all available data on the larval chondrocrania and internal …
Chondrocranial And Oral Morphology Of Pipoid Frogs, Charles Christopher Swart
Chondrocranial And Oral Morphology Of Pipoid Frogs, Charles Christopher Swart
Master's Theses
The Pipoidea are a diverse group of frogs. Their diversity is demonstrated in their morphology, ecology, and behavior. One pipoid species, Xenopus laevis, has been used as a model system of developmental, physiological, and molecular studies of vertebrates. My work has focused on the developmental morphology of the chondrocranium and oral morphology of four pipoid taxa: Hymenochirus boettgeri, Rhinophrynus dorsalis, Pipa carvalhoi, and Xenopus laevis. Previous studies have suggested that the Anura may be diphyletic based on the unique characteristics of the chondrocanial morphology of pipoids. The chondrocranial and internal oral morphology of the pipoids indicates that as a group …