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Model-Based Tests Of Historical Demography And Species Delimitation In The Caribbean Coral Reef Sponge Callyspongia, Melissa Barrett Debiasse
Model-Based Tests Of Historical Demography And Species Delimitation In The Caribbean Coral Reef Sponge Callyspongia, Melissa Barrett Debiasse
LSU Doctoral Dissertations
Coral reefs are the most productive and species rich ecosystems in the ocean yet we lack knowledge about the distribution of genetic variation the within and among reef species, particularly for the sponges (Porifera). My dissertation describes how genetic variation at mitochondrial and nuclear genes is partitioned among and within species in the sponge genus Callyspongia. I compared patterns of genetic diversity and population subdivision in the mitochondrial and nuclear genomes of one species, C. vaginalis, in Florida (Chapter 2). Previous work revealed three divergent mitochondrial lineages, but nuclear alleles did not correspond to either mitochondrial clade or geography. Coalescent …
Paleoclimatology And Paleotempestology Study Of Blue Hole, Lighthouse Reef, Belize Through Geochemical Proxies, Laura Carolyn Sorey
Paleoclimatology And Paleotempestology Study Of Blue Hole, Lighthouse Reef, Belize Through Geochemical Proxies, Laura Carolyn Sorey
LSU Master's Theses
A large Pleistocene age sinkhole, the Blue Hole on Lighthouse Reef off the coast of Belize in the Caribbean Sea is the site of a well preserved sedimentary record that serves as paleoclimatology and paleotempestology archive. The nutrient-starved surface waters of the Blue Hole and the surrounding lagoons are “fertilized” by the seasonal introduction of cool, nutrient-rich waters upwelled from the Caribbean deep water. These waters, which stimulate production of organic materials within the surface waters, carry a heightened isotopic signature that is imparted to the organics resultant from upwelling-induced production. These organics are then incorporated into the predominantly carbonate …
Adaptive Divergence And Speciation Across Depth In A Caribbean Candelabrum Coral, Carlos Andrés Prada Montoya
Adaptive Divergence And Speciation Across Depth In A Caribbean Candelabrum Coral, Carlos Andrés Prada Montoya
LSU Doctoral Dissertations
Since Darwin, biologists wonder how organisms cope with environmental variation, why there are so many species, and how species form. In my dissertation, I explore how species of long-lived, clonal reef organisms originate across depth gradients. In Chapter 2, I evaluate the strength of depth to isolate populations by comparing the genes and morphologies of pairs of depth-segregated populations of the candelabrum coral Eunicea flexuosa across the Caribbean. Eunicea flexuosa is a long-lived clonal cnidarian that associates with an alga of the genus Symbiodinium. Genetic analysis revealed two depth-segregated lineages, each genetically well-mixed across the Caribbean. Survivorship data, combined with …
Construction De L'Identité Culturelle Afro-Antillaise : Regards Croisés Entre Maryse Condé, Gisèle Pineau Et Fabienne Kanor, Jeanne Jégousso
Construction De L'Identité Culturelle Afro-Antillaise : Regards Croisés Entre Maryse Condé, Gisèle Pineau Et Fabienne Kanor, Jeanne Jégousso
LSU Master's Theses
The theme of cultural identity is one of the main problematic of francophone literature. Through the years, women writers, especially in Guadeloupe and Martinique, used this theme as the main topic of many of their writings. Characters, especially women narrators, try to understand this notion of cultural identity and its construction in other to make this theme theirs, since cultural identity is at the crossroads of their own story, the history of the Caribbean, and the perception these young women have of themselves. A new generation of writers, born in France of Caribbean families, tries today to offer a new …