Download or read book Evaluation of Hatchling Sex Ratios from Natural Nesting Beaches of Hawksbill and Green Sea Turtles with Temperature Dependent Sex Determination written by Jennifer Michelle Estes and published by . This book was released on 2003 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Twenty second Annual Symposium on Sea Turtle Biology and Conservation written by Jeffrey Aleksandr Seminoff and published by . This book was released on 2003 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Twenty fifth Annual Symposium on Sea Turtle Biology and Conservation written by Heather Kalb and published by . This book was released on 2008 with total page 244 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 Climate Change in Australia written by Commonwealth Scientific and Industrial Research Organization (Australia) and published by . This book was released on 2007 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: An assessment of climate change in Australia, including projections of Australia's future climate.
Download or read book Temperature Dependent Sex Determination in Vertebrates written by Nicole Valenzuela and published by Smithsonian Institution Scholarly Press. This book was released on 2004 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edited by the world's foremost authorities on the subject, with essays by leading scholars in the field, this work shows how the sex of reptiles and many fish is determined not by the chromosomes they inherit but by the temperature at which incubation takes place.
Download or read book Biological Ecological and Conservational Implications of Temperature dependent Sex Determination in Sea Turtle Populations written by Jennifer Estes Layton and published by . This book was released on 2011 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aspects of TSD were examined in two different sea turtle populations, representing two sea turtle species. Sex ratio was examined in the juvenile portion of the loggerhead sea turtle population in the southeastern U.S. Blood samples were analyzed in a testosterone radioimmunoassay. The results suggest a significant female-biased sex ratio (2.5F:1.0M). The presence of a female-biased sex ratio has significant implications for the conservation of this population. Another study examined nesting beach temperatures throughout the range of loggerhead nesting in the southeastern U.S. from 2004-2009. Beach temperatures were simultaneously recorded at nest depth on nesting beaches used by this population. The results indicate that temperatures vary significantly between nesting beaches, with potential sex ratios ranging from highly female biased to male biased depending on the beach. The results provide an initial data set for evaluating long-term changes in beach temperatures associated with global climate change. A third study investigated temperature-dependent sex determination in the Hawaiian green turtle. Beach and nest temperatures from 2003-2009 were evaluated. Collectively, the data indicate that temperatures at FFS were low compared to those reported for other sea turtle nesting beaches. Such cool temperatures are not conducive to the production of female-biases which have been reported for other green turtle populations. An experiment was conducted to evaluate the effects of temperatures similar to those from the nesting beach on sex determination in the Hawaiian green. The hatchlings were subsequently reared in captivity and were sexed by laparoscopy prior to their release. The results indicate that the pivotal temperature for the Hawaiian green is not lower than those reported for other green populations. This finding plus the relatively cool temperatures recorded at FFS, indicate the overall hatchling sex ratio of Hawaiian greens is predicted to be unbiased or even male-biased. The purpose of the final chapter was to develop an educational module for high school and college students, which demonstrates how modern molecular genetics can be utilized for conservation of endangered species. This chapter includes implementation of the module into local high schools, UAB CORD Summer Science Institute, and the college curriculum at Dauphin Island Sea Lab.
Download or read book The Leatherback Turtle written by James R. Spotila and published by JHU Press. This book was released on 2015-10-30 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most comprehensive book ever written on leatherback sea turtles. Weighing as much as 2,000 pounds and reaching lengths of over seven feet, leatherback turtles are the world’s largest reptile. These unusual sea turtles have a thick, pliable shell that helps them to withstand great depths—they can swim more than one thousand meters below the surface in search of food. And what food source sustains these goliaths? Their diet consists almost exclusively of jellyfish, a meal they crisscross the oceans to find. Leatherbacks have been declining in recent decades, and some predict they will be gone by the end of this century. Why? Because of two primary factors: human redevelopment of nesting beaches and commercial fishing. There are only twenty-nine index beaches in the world where these turtles nest, and there is immense pressure to develop most of them into homes or resorts. At the same time, longline and gill net fisheries continue to overwhelm waters frequented by leatherbacks. In The Leatherback Turtle, James R. Spotila and Pilar Santidrián Tomillo bring together the world’s leading experts to produce a volume that reveals the biology of the leatherback while putting a spotlight on the conservation problems and solutions related to the species. The book leaves us with options: embark on the conservation strategy laid out within its pages and save one of nature’s most splendid creations, or watch yet another magnificent species disappear.
Download or read book Advances in Marine Biology written by and published by Academic Press. This book was released on 2009-11-02 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Marine Biology has been providing in-depth and up-to-date reviews on all aspects of marine biology since 1963 -- over 40 years of outstanding coverage! The series is well-known for both its excellence of reviews and editing. Now edited by D.W. Sims (Marine Biological Association Laboratory, Plymouth, UK), with an internationally renowned Editorial Board, the serial publishes in-depth and up-to-date content on a wide range of topics that will appeal to postgraduates and researchers in marine biology, fisheries science, ecology, zoology, and biological oceanography. - Rated "Number 1" in the highly competitive category of Marine and Freshwater Biology by ISI in the 2000 ISI journals citation report - Maintains an Impact Factor of 3.37, the highest in the field - Series features over 35 years of coverage of the research
Download or read book Collected Reprints written by Southwest Fisheries Center (U.S.) and published by . This book was released on 1993 with total page 1262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Palm Beach County Beach Erosion Control Projects written by and published by . This book was released on 1987 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Brevard County Beach Erosion Control Cape Canaveral Indialantic Melbourne Beach written by and published by . This book was released on 1972 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Management Techniques for the Conservation of Sea Turtles written by and published by . This book was released on 1999 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Zoology written by and published by . This book was released on 2002 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sea Turtles Natural History and Conservation written by H. Robert Bustard and published by . This book was released on 1973 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nesting in reptiles natural and anthropogenic threats and evolutionary responses written by J. Sean Doody and published by Frontiers Media SA. This book was released on 2023-01-06 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chelonian Conservation and Biology written by and published by . This book was released on 2001 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
