Download or read book Bioaccumulation and Health Effects of Contaminants in the East Pacific Green Turtle Chelonia Mydas and Habitat in San Diego Bay written by Lisa M Komoroske and published by . This book was released on 2009 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Twenty ninth Annual Symposium on Sea Turtle Biology and Conservation written by and published by . This book was released on 2012 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recovery Plan for U S Pacific Populations of the East Pacific Green Turtle Chelonia Mydas written by Pacific Sea Turtle Recovery Team (U.S.) and published by . This book was released on 1998 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatial and Temporal Patterns of Habitat Use by East Pacific Green Turtles Chelonia Mydas in a Highly Urbanized Foraging Ground written by and published by . This book was released on 2012 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Green sea turtles, Chelonia mydas, utilize coastal areas as foraging grounds for the majority of their lives. Human development of coastlines is increasing, but the effects of the urbanization of foraging grounds on green turtles are poorly understood. I used both manual and automated acoustic telemetry to determine the home ranges, movement behavior, and temporal patterns of site visitation of green turtles during 2009-2011 in San Diego Bay, California, a highly urbanized temperate foraging area. The home ranges of all tracked turtles were restricted to the southern portion of San Diego Bay, where eelgrass (Zostera marina) is abundant and where human activity is the lowest within the bay. Core activity areas coincided with eelgrass distribution or occurred adjacent to the warm water-effluent outfall of a waterfront power plant. Automated monitoring of sites throughout south San Diego Bay confirmed this finding, showing that green turtles most frequently visited the outfall of the power plant and areas known to contain eelgrass. This method also elucidated that turtle presence at the power plant was strongest during the winter and at night, whereas visitation to eelgrass areas was strongest during the spring and in the daytime. Turtle visitation to a high boat traffic shipping terminal was rare but occurred almost exclusively during the daytime, the period during which human activities in the area are also the highest. Manual tracking of green turtles similarly demonstrated that individuals ranged across larger portions of south San Diego Bay during the day, during which they exhibited high swimming speeds but highly non-linear movement. Turtle activity at night was primarily restricted to the power plant's effluent outfall channel and adjacent jetty. Nighttime movement was characterized by long periods of inactivity sporadically interrupted by brief, linear movements to new resting locations. Collectively, the results of this study paint a robust picture of the spatial, diel, and seasonal patterns of habitat use by green turtles in San Diego Bay. All data support the hypothesis that south San Diego Bay serves as important turtle habitat within the bay. Further, a combination of manual and automated acoustic telemetry enables a more complete understanding of turtle spatial ecology that would not have been possible with exclusive use of one technique. Future monitoring and modeling is required to document the potential effects of changing environmental conditions, including power plant closure, on green turtles resident to San Diego Bay. This study helps to assess the data gap of how turtles use urbanized foraging areas and changing coastal ecosystems, a currently novel scenario that will likely become commonplace in the face of increasing coastal development worldwide.
Download or read book Synopsis of the Biological Data on the Green Turtle Chelonia Mydas Linnaeus 1758 written by Harold F. Hirth and published by . This book was released on 1997 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Temperature on Habitat Use by East Pacific Green Turtles chelonian Mynas in an Urbanized Environment written by Sheila Veronica Madrak and published by . This book was released on 2016 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Project Overview. Thermal characteristics of marine environments are changing rapidly on both global and local scales. Worldwide, ocean temperatures are increasing -- a trend expected to continue (Meehl et al. 2005; Bindoff et al. 2007; IPCC 2007). However, at the local level water temperature is more variable, demonstrating both warming and cooling through space and time (Hoegh-Guldberg and Bruno 2010; Kosaka and Xie 2013). Many marine organisms are adapted to specific, often highly constrained, thermal ranges. Global climate change and anthropogenic influences have already had dramatic effects on marine species (Harley et al. 2006; IPCC 2007; Hoegh-Guldberg and Bruno 2010). While large-scale changes in temperature can be attributed to shifts in the global climate regime, there are other human-mediated factors that influence local thermal conditions. One major anthropogenic influence on local marine environments is thermal effluent from power plants and industry that utilize once-through cooling (OTC) systems. The stations that use OTC systems generate waste heat, a by-product of the cooling process, which must be released into the environment (either via cooling towers or natural water source). Thus, OTC system stations alter the thermal environment proximate to their locations. Although local and global scale changes may be driven by different factors, changes to the thermal environment at the local level can provide a model system to study the effects of largescale climate change. Characterizing the responses of coastal fauna to rapid shifts in thermal conditions addresses a key gap in ecological knowledge -- understanding how populations of longlived marine vertebrates will be affected by a thermally dynamic environment that is changing at rapid rate. The fossil fuel-based South Bay Power Plant (SBPP) in San Diego, California was in operation from 1960 to 2010 and discharged warm-water effluent into southern San Diego Bay (SDB) and utilized an OTC system. East Pacific green sea turtles (Chelonia mydas), resident in SDB since at least the 1890's (Parsons 1962), have been routinely observed in the power plant outfall area since the 1960s (Stinson 1984; McDonald and Dutton 1990). Previous research suggests that these turtles used the outfall area to reduce metabolic costs and exhibit higher growth rates than other populations of green turtles (Eguchi et al. 2010, Eguchi et al. 2012). On December 31, 2009, two of the plant's four generators were permanently shut down; complete decommissioning of the plant occurred on December 31, 2010. This power plant closure provided a rare experimental opportunity to assess how rapid changes in the thermal environment will affect a resident marine turtle population in a coastal foraging area. The first chapter of my dissertation represents a review of the scientific studies that demonstrated physiological and behavioral changes across mobile aquatic reptiles utilizing these areas with heated effluent. I identify key responses to thermal effluent in reptiles in both marine and freshwater environments and present a case study from green turtles in SDB. The second chapter of my dissertation reflects my research using acoustic telemetry to monitor the changes in distribution and behavior of green turtles in response to the closure of the SBPP. The third and final chapter of my dissertation summarizes the changes of dive behavior by green turtles before and after the closure of the SBPP.
Download or read book Recovery Plan for U S Population of Atlantic Green Turtle Chelonia Mydas written by and published by . This book was released on 1991 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparing Persistent Organic Pollutants and Trace Metals in Green Sea Turtles Chelonia Mydas Inhabiting Two Urbanized Habitats in Southern California written by Arthur David Barraza and published by . This book was released on 2018 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Two foraging aggregations of green sea turtles (Chelonia mydas) inhabit the Seal Beach National Wildlife Refuge (SBNWR) and San Diego Bay (SDB), California, and are potentially exposed to trace metal (TM) and persistent organic pollutant (POP) contamination in these urbanized habitats. Due to differences in anthropogenic activity, it was hypothesized that turtles from SBNWR and SDB have different TM and POP contaminant signatures. Turtles from SBNWR (17 turtles) and SDB (25 turtles) were captured, were measured and had blood and scute samples obtained for contaminant analysis. Principal component analyses indicated that turtles from SBNWR and SDB had differential contaminant signatures, with selenium and PCBs driving the majority of the difference. SBNWR turtles had higher selenium, while SDB turtles had higher PCBs. Future studies could benefit from comparing these two green turtle populations in future health assessments; particularly, how excess selenium and non dioxin-like PCBs affect green turtle physiology.
Download or read book Recovery Plan for U S Pacific Populations of the Green Turtle Chelonia Mydas written by Pacific Sea Turtle Recovery Team (U.S.) and published by . This book was released on 1998 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Biology and Population Status of Marine Turtles in the North Pacific Ocean written by Karen L. Eckert and published by . This book was released on 1993 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Occurrence of Potential Pathogens in Green Sea Turtles Chelonia Mydas Afflicted Or Free of Fibropapillomas in Kaneohe Bay Island of Oahu Hawaii 1991 written by A. Alonso Aguirre and published by . This book was released on 1992 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synopsis of Biological Data on the Green Turtle Chelonia Mydas Linnaeus 1758 written by Harold F. Hirth and published by . This book was released on 1971 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physiological Consequences of Basking Disease and Captivity in the Green Turtle Chelonia Mydas written by Jana Yonat Beth Swimmer and published by . This book was released on 1997 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feeding Habits of the East Pacific Green Turtle Chelonia Mydas in Bah a Magdalena Baja California Sur M xico written by Sarah Christian Hilbert and published by . This book was released on 2001 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Review of the Effects of Pollution on Marine Turtles written by Judith Hutchinson and published by . This book was released on 1991 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of a Species Distribution Model for the East Pacific Green Sea Turtle Using Ecological Geoprocessing Tools written by Roxanne Duncan and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: East Pacific green sea turtles, Chelonia mydas, play ecologically important roles in marine habitats which range from grazing (and thus regularly "mowing") algae and seagrass beds to cycling nutrients between the ocean and land. However, these important grazers have been hunted to ecological extinction in some places for their eggs, meat, and skin. The conservation initiative for the survival of sea turtles requires the protection of their primary habitats in conjunction with a decrease in their interaction with humans. One way these objectives can be met is through the creation of species distribution maps (SDMs). For this thesis, a SDM was created from a generalized additive model used to identify major feeding areas for East Pacific green turtles residing in the Galapagos Islands. The input for the model was green turtle sighting locations during a June 2010 marine life observation survey and remotely sensed values of four oceanographic parameters obtained from satellite sensors (Bathymetry, Sea Surface Temperature, Chlorophyll a, and Current Speed). Line transects of intertidal and subtidal shoreline regions of the islands of Isabela, San Cristobal, and Floreana were also completed, to describe similarities and differences in macroalgal abundance between the locations. A generalized additive model (GAM) explained 56% of the data's null deviance and had a true positive rate of 0.83. The corresponding species distribution map indicated that East Pacific green sea turtles prefer to forage in warm, low chlorophyll a, slow moving waters at depths mostly less than 250m throughout the archipelago. ANOVA analyses showed that macroalgal abundance was statistically different (p-value
Download or read book The Effects of Temperature and Habitat on the Movement Patterns of Green Sea Turtles Chelonia Mydas Within an Urbanized River and Local Estuary written by Daniel Crear and published by . This book was released on 2016 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Urban coastal development has led to major changes in ocean temperatures and habitats along the coastline. These alterations particularly affect coastal ectothermic marine species, such as green sea turtles, Chelonia mydas. This species has been observed north of their geographical range in the eastern Pacific; inhabiting a river and estuary that both have anthropogenically-altered water temperatures and habitats. Passive and active acoustic telemetry was used to determine how green sea turtle movements and habitat use were affected by these anthropogenically-altered sites. Turtles used both sites during the summer months, while during the winter, individuals selected for areas where warm water was discharged from power plants into the river. Further, turtles tracked in the larger river used more area than those tracked in the smaller estuary. Turtles selected habitats associated with manmade structures at both sites and eelgrass beds within the estuary to potentially rest and forage upon.
