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Book Thermal Habitat Characterization of Loggerhead Sea Turtle Caretta Caretta Nests on Masonboro Island

Download or read book Thermal Habitat Characterization of Loggerhead Sea Turtle Caretta Caretta Nests on Masonboro Island written by Sarah Elizabeth Arsenoff and published by . This book was released on 2011 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Life History and Environmental Requirements of Loggerhead Turtles

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:

Book Life History and Environmental Requirements of Loggerhead Turtles

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:

Book Effectiveness of Protection Measures on Loggerhead Sea Turtle Caretta Caretta Nests in Response to Red Fox Vulpes Vulpes Predation on Masonboro Island North Carolina

Download or read book Effectiveness of Protection Measures on Loggerhead Sea Turtle Caretta Caretta Nests in Response to Red Fox Vulpes Vulpes Predation on Masonboro Island North Carolina written by Claire M. Vaiden and published by . This book was released on 2008 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Synopsis of the Biological Data on the Loggerhead Sea Turtle

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:

Book An Assessment of the Loggerhead Turtle Population in the Western Northern Atlantic Ocean

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:

Book Beach Nourishment Influences Sand Characteristics and Thermal Properties Across a Regionally Important Loggerhead Sea Turtle Caretta Caretta Rookery

Download or read book Beach Nourishment Influences Sand Characteristics and Thermal Properties Across a Regionally Important Loggerhead Sea Turtle Caretta Caretta Rookery written by Kaitlynn Maris Shamblott and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Synopsis of the Biological Data on the Loggerhead Sea Turtle

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:

Book Interseasonal Nesting Patterns of Loggerhead Sea Turtles Caretta Caretta on Bald Head Island North Carolina

Download or read book Interseasonal Nesting Patterns of Loggerhead Sea Turtles Caretta Caretta on Bald Head Island North Carolina written by Charles Brannon Quel and published by . This book was released on 2001 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Defining Habitat Preferences of Pelagic Loggerhead Sea Turtles Caretta Caretta in the North Atlantic Through Analysis of Behavior and Bycatch

Download or read book Defining Habitat Preferences of Pelagic Loggerhead Sea Turtles Caretta Caretta in the North Atlantic Through Analysis of Behavior and Bycatch written by Abigail L. McCarthy and published by . This book was released on 2007 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: For many species of marine turtle the characteristics that define pelagic habitat have yet to be fully identified. A better understanding of these habitat characteristics is critical to reduce high seas fisheries interactions with turtles, especially as the status of many turtle populations has placed them on the threatened or endangered species list. The combination of high-resolution satellite-tracking data with remotely sensed oceanographic data makes it possible to identify habitat for loggerhead turtles by analyzing the behavior of individual animals. Bycatch of loggerhead turtles in longline fisheries can also be examined using the same high-resolution oceanographic data to determine if there are identifiable habitat differences in high- and low- bycatch areas. I analyzed the tracks of ten loggerhead turtles tagged in the spring and fall of 1998 near Madeira, Portugal in relation to the marine environment they occupied. To determine the relationship between an individual turtle and its environment, some measure of behavior was necessary. I calculated the straightness index (SI), the ratio of the displacement of the animal to the total distance traveled, for individual weekly segments of the ten tracks as a measure of individual behavior. I then extracted information about the chlorophyll, sea-surface temperature (SST), bathymetry, and geostrophic current of the ocean in a 20km buffer surrounding the tracks, and examined the relationship between the straightness index and those characteristics using logistic regression. Chlorophyll a value, bathymetry, and movement of the turtle with geostrophic currents were consistently related to the straightness index of the tracks of all ten animals (two-sided p-value from Wald's test: 0.005, 0.0017, and 0.0018, respectively). Tracks were less straight in high chlorophyll regions and in shallower ocean areas, and animals were more likely to be moving with prevailing geostrophic currents during straighter track segments. These results confirm comparable analyses of loggerhead tracks in the Pacific, and indicate that sea turtles alter their behavior (likely representing a shift from traveling to foraging) when they encounter high-chlorophyll regions. Turtles with highly sinuous tracks spend more time in a given area or habitat than those who pass straight through, and therefore may be more susceptible to incidental capture by fisheries operating in those habitats. To address the fisheries bycatch/ habitat interactions I analyzed longline bycatch data to determine whether the marine environmental variables identified in the first part of my study were related to the probability of catching a turtle on a given longline set. I performed a logistic regression analysis using bycatch of turtles as the response variable, and bathymetry, SST, SST gradient (indicative of frontal activity), chlorophyll a, and chlorophyll a gradient as the independent variables. I also included the location and the date of the longline sets as potential predictor variables. I found that the most important variables predicting the odds that a turtle would be caught on a given set were chlorophyll a value in the area of the haul ( Wald's test, p=0.009) and the latitude at the beginning of the haul (Wald's test, p=0.0005). Turtles were more likely to be caught on sets in lower chlorophyll regions and in higher latitude regions of the data set, and there was no indication of important effects of bathymetry. These results disagree with my predictions from the tracking analysis, either because the fisheries-dependent bycatch data set did not provide enough contrast of habitat types, or because bycatch probability is not related to turtle behavior. My results indicate a difference between the critical variables selected as predictors of turtle habitat using the bycatch data and those selected using the behavior of individual tracked animals. While bycatch information is important, the distribution of fisheries data is highly biased towards frontal zones and regions of historic high catch. Judgments about turtle behavior based on only fisheries interactions could lead to incorrect conclusions about where animals spend the majority of their time. Assuming that animals are more likely to have an increased probability of interaction with longlines in areas where they spend more time foraging, fishing pressure should be reduced in those areas of high-use for pelagic loggerheads. It is crucial to base fisheries time-area closures and the design of marine protected areas on the behavior of tracked animals, and not just on fisheries bycatch data.

Book Examining the Effects of Beach Nourishment on Loggerhead Sea Turtle Caretta Caretta Nest Hatching Success on Bald Head Island North Carolina

Download or read book Examining the Effects of Beach Nourishment on Loggerhead Sea Turtle Caretta Caretta Nest Hatching Success on Bald Head Island North Carolina written by Brianna Wilcke Elliott and published by . This book was released on 2012 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: