Current Search: Dougherty, Erin. (x)
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Title
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Environmental Restoration and Water Circulation Improvement of the Guachinanga Channel, San Jose Lagoon, PR.
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Creator
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Dougherty, Rebecca R., Hague, Erin, Graduate College
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Abstract/Description
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Urbanization has increased over the last 50+ years around the San José Lagoon, San Juan, Puerto Rico significantly degrading the Lagoon’s ecosystem. The nutrient and sediment loading has caused excessive vegetative growth along the Caño Martín Peña and Guachinanga Channel due to encroachment of infrastructure along the banks of the eastern portion of the river combined with increased nutrient and sediment loading from untreated sewage and stormwater runoff. This has resulted in decreased...
Show moreUrbanization has increased over the last 50+ years around the San José Lagoon, San Juan, Puerto Rico significantly degrading the Lagoon’s ecosystem. The nutrient and sediment loading has caused excessive vegetative growth along the Caño Martín Peña and Guachinanga Channel due to encroachment of infrastructure along the banks of the eastern portion of the river combined with increased nutrient and sediment loading from untreated sewage and stormwater runoff. This has resulted in decreased tidal exchange between San Juan Bay and San José Lagoon, and around Guachinanga Islet. The restoration plan seeks to 1) restore the habitat on Guachinanga Islet by removing a vegetated land bridge used by non-native species that access the Islet and potentially impact native populations, and 2) improve water quality by removing sediment, debris and vegetation to allow flushing in the Guachinanga Channel, around the Islet and adjacent Caño Martín Peña 3) dispose of the comprised dredged resources in a beneficial use manner. An innovative dredge process seeks to address the logistical challenges of the project area. The resulting beneficial use skate and recreational park seeks partnering opportunities of the various social, ecological and health initiatives of the adjacent Caño Martín Peña restoration plan.
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Date Issued
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2014
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PURL
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http://purl.flvc.org/fau/fd/FA00005144
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Format
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Document (PDF)
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Title
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A comparison of stability in swimming loggerhead (Caretta caretta) and green (Chelonia mydas) sea turtle posthatchlings.
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Creator
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Dougherty, Erin., Charles E. Schmidt College of Science, Department of Biological Sciences
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Abstract/Description
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Posthatchling green (Chelonia mydas) and loggerhead (Caretta caretta) turtles overlap ecologically but differ morphologically. This study compared hydrodynamic stability between the two species during swimming to test for functional differences in body shape. Flipper movement paths, four stability measures (yaw, pitch, heave, and sideslip), and the relative positions of the centers of buoyancy and gravity were compared between species. Both centers of buoyancy and gravity lie in the anterior...
Show morePosthatchling green (Chelonia mydas) and loggerhead (Caretta caretta) turtles overlap ecologically but differ morphologically. This study compared hydrodynamic stability between the two species during swimming to test for functional differences in body shape. Flipper movement paths, four stability measures (yaw, pitch, heave, and sideslip), and the relative positions of the centers of buoyancy and gravity were compared between species. Both centers of buoyancy and gravity lie in the anterior body; their positions relative to one another differed with species, but showed no functional consequences. Neither species demonstrated substantial yaw, sideslip, or pitch. Both experienced upward heave with the flippers' downstroke and downward heave with the upstroke; however phase relationships differed between these limb and body motions. No differences were found between the two species. Despite obvious morphological differences, loggerheads and green turtles were similarly stable during swimming, suggesting that the species use different mechanisms to achieve stability.
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Date Issued
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2009
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PURL
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http://purl.flvc.org/FAU/186689
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Subject Headings
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Sea turtles, Morphology, Sea turtles, Physiology, Animal locomotion, Marine ecology
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Format
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Document (PDF)
