Download or read book Estimating Past and Present Sex Ratios of Loggerhead Sea Turtle Caretta Caretta Hatchlings on Edisto Island South Carolina written by Cassandra Marshburn Bell and published by . This book was released on 2003 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Master s Theses Directories written by and published by . This book was released on 2004 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".

Download or read book Determination of Sex Ratios and Their Relationship to Nest Temperature of Loggerhead Sea Turtle Caretta Caretta L Hatchlings Produced Along the Southeastern Atlantic Coast of the United States written by Kimberly Blair and published by . This book was released on 2005 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Potential Biasing of Loggerhead Sea Turtle Caretta Caretta Hatchling Sex Ratios on St Catherine s Island GA written by Catherine D. McCurdy and published by . This book was released on 2009 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sex Ratios of Sea Turtle Hatchlings Direct and Indirect Estimates written by Matthew Howland Godfrey and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: To generate more data on sex ratios of sea turtle hatchlings, I developed a simple method of collecting daily mean sand temperatures on nesting beaches. Sand temperature can be used as an index of sex ratio. I then measured sand temperatures and sampled gonads of hatchlings of two sea turtle species on a nesting beach in Suriname during 1993. From histological analysis of the gonads, combined with information on the relative numbers of turtles nesting during the season, I generated overall estimates of sex ratio for green sea turtles (63.8% female) and for leatherback turtles (69.4% female). Relative numbers of male and female hatchlings varied throughout the season, and this corresponded to changes in sand temperatures and rainfall. From historical rainfall records and from past records of nesting frequency, I estimated overall sex ratios for another 13 seasons. Seasonal sex ratios fluctuated yearly. A revised estimate of the pivotal temperature (that constant incubation temperature which produces equal numbers of each sex) of green turtles in Suriname was 29.4$\sp\circ$C; this was slightly higher than past estimates. The transitional range of temperature (TRT), which is the range of incubation temperatures over which both sexes are produced, spanned several degrees. Metabolic warming was monitored in leatherback nests. It was found that eggs were about 0.8$\sp\circ$C warmer on average than the surrounding sand during the thermosensitive period of sexual differentiation. Because the leatherback has a narrow TRT, the influence of metabolic warming on sex ratio probably is restricted to a narrow range of incubation temperatures. Lastly, a new method of estimating sex ratios was devised, based on the rate of development of eggs and prevailing incubation temperatures. In general, nests with shorter incubation times produce mostly females and nests with longer incubation times produce mostly males. This relationship could be useful for generating predictions of sex ratio from natural nests for which only the incubation duration is known. In addition, by comparing this relationship from laboratory and field studies, it was possible to quantify the time it takes loggerhead hatchlings to dig up from the nest once they have hatched.

Download or read book Synopsis of the Biological Data on the Loggerhead Sea Turtle written by C. Kenneth Dodd and published by . This book was released on 1988 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Timing of Sexual Differentiation in the Loggerhead Sea Turtle Caretta Caretta and Predicting Sex Ratios in Natural Nests of Loggerhead Sea Turtles Caretta Caretta from Nest Temperatures written by Joseph F. Gouveia and published by . This book was released on 1988 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Estimating Predation Levels and Site specific Survival of Hatchling Loggerhead Sea Turtles Caretta Caretta from South Florida Beaches written by Christie L. Whelan and published by . This book was released on 2005 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Incubation Temperature Effects on Hatchling Performance in the Loggerhead Sea Turtle Caretta Caretta written by Leah Fisher and published by . This book was released on 2012 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Incubation temperature has significant developmental effects on oviparous animals, including determining sex for several species. For the Northwest Atlantic loggerhead sea turtle (Caretta caretta), apparent population-wide female-biased hatchling sex ratios contrast with observations of juvenile populations, where sex ratios have remained constant at about 2 to 1 female-biased over the past 30 years. It has been suggested that some unknown factor is affecting loggerhead survival resulting in an unexplained differential loss of ~60% of female hatchlings per year. One theory to explain this hatchling mortality is tested in this project, that incubation temperature affects traits that influence survival. Furthermore, there may be differential survival between male and female hatchlings. I conducted laboratory experiments to test for an effect of incubation temperature on performance of loggerhead hatchlings. I tested 68 hatchlings produced from eggs incubated at 8 different constant temperatures ranging from ~27°C to ~32.5°C. Following their emergence from the eggs, I tested righting response, crawling speed, and conducted a 24-hour long hatchling swim test. Data indicate an effect of incubation temperature on survivorship, righting response time, crawling speed, change in crawl speed, and overall swim activity, with hatchlings incubated at 27°C showing decreased locomotor abilities. No hatchlings survived when incubated at 32°C and above. Differences in survivorship of hatchlings incubated at high temperatures are important in light of projected higher sand temperatures due to climate change, and could indicate increased mortality from incubation temperature effects.

Download or read book Life History and Environmental Requirements of Loggerhead Turtles written by David A. Nelson and published by . This book was released on 1988 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Life History and Environmental Requirements of Loggerhead Turtles written by David Arthur Nelson and published by . This book was released on 1988 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Assessment of the Loggerhead Turtle Population in the Western Northern Atlantic Ocean written by Southeast Fisheries Science Center (U.S.). Turtle Expert Working Group and published by . This book was released on 2009 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nest Success and Hatchling Sex Ratio of Loggerhead Sea Turtles Caretta Caretta at Mainland Rookeries in Eastern Australia written by Stephanie Lemm and published by . This book was released on 1996 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sex Ratios of Sea Turtle Hatchlings Direct and Indirect Estimates written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of Methods for Estimating Hatchling Sea Turtle Sex Ratios written by Joanne Nicole Hanson and published by . This book was released on 1997 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synopsis of the Biological Data on the Loggerhead Sea Turtle written by C. Kenneth Dodd and published by . This book was released on 1988 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nest Success and the Survival and Movement of Hatchlings of the Loggerhead Sea Turtle Caretta Caretta on Cape Lookout National Seashore written by Joseph S. Ferris and published by . This book was released on 1986 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: