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University of South Florida

2003

Biogeography

Articles 1 - 2 of 2

Full-Text Articles in Arts and Humanities

Phylogeography And Evolution Of The Florida Crown Conch (Melongena Corona), Kenneth A. Hayes Nov 2003

Phylogeography And Evolution Of The Florida Crown Conch (Melongena Corona), Kenneth A. Hayes

USF Tampa Graduate Theses and Dissertations

Melongena corona and closely related congeners are a conspicuous part of the marine intertidal benthic communities of Florida and southeastern Alabama. Significant genetic differentiation among adjacent populations has been conjectured based on variation in shell morphology, habitat discontinuity, low levels of adult motility, and the presence of an aplanic lecithotrophic larval stage. Furthermore, studies of the highly variable shell morphology often have resulted in confusing specific and subspecific definitions of these gastropods, which are often referred to as the "corona complex". Variation in shell morphology may indicate local adaptation or environmentally induced phenotypic plasticity. In this study I utilized mitochondrial …


Population Structure Of The Gopher Tortise (Gopherus Polyphemus) In Florida, Using Microsatellites, Tonia S. Schwartz Apr 2003

Population Structure Of The Gopher Tortise (Gopherus Polyphemus) In Florida, Using Microsatellites, Tonia S. Schwartz

USF Tampa Graduate Theses and Dissertations

Gopher tortoise (Gopherus polyphemus) population sizes have drastically declined in the past 100 years. Much of this decline has been attributed to past human predation, to habitat loss from human development, and potentially to the recently discovered upper respiratory tract disease. An understanding of the genetic structure among populations is critical for the long-term success of relocation and other management strategies. This research focuses on the development of a suite of genetic markers and the answers they provided to questions concerning present day population genetics and its use in management. In addition, this study provides inference on historical …