Browsing by Author "Williams, Theodore D."
Now showing 1 - 3 of 3
- Results Per Page
- Sort Options
Item Detection, Verification and Decoding of Tags and Marks in Head Started Kemp's Ridley Sea Turtles, Lepidochelys kempii(United States Department of Commerce National Oceanic and Atmospheric Administration, 1993-12) Williams, Theodore D.; Revera, Dickie B.; Fontaine, Clark T.; Caillouet, Charles W., Jr.Preparation of this manual was motivated by recommendations made by a peer review panel of experts who evaluated the Kemp's ridley sea turtle (Lepidochelys kempii) head start experiment at the National Marine Fisheries Service (NMFS), Southeast Fisheries Science Center's (SEFSC)Galveston Laboratory on September 22-23, 1992 (Eckert et al. 1992). After examining the head start experimental design, data and analytical results, the panel expressed the goal of the experiment in the following hypotheses (modified slightly for clarity by the authors of this paper; see also Wibbels et al. 1989): (1) Head starting can provide Kemp's ridley juveniles which are able to join the natural population, mature, find their way to nesting beaches and procreate (produce viable progeny), and (2) head started turtles demonstrate equivalent or superior biological fitness, defined as equal or better survival rates from egg to reproductive adult, and equivalent fecundity as compared to wild Kemp's ridleys.Item Early Growth in Weight of Kemp's Ridley Sea Turtles (Lepidochelys kempii) in Captivity(Gulf Research Reports, 1997) Caillouet, Charles W., Jr.; Fontaine, Clark T.; Williams, Theodore D.; Manzella-Tirpak, Sharon A.Growth in individual weight (w, kg) of Kemp's ridley sea turtles (lepidochelys kempii) in captivity was described for 15 year-classes (1978-1992) of turtles between ages (t) 0.17 to 1.22 yr, using ln- linear regression: lnw = lnc + dt^1/2, where lnc is the intercept and d is the slope (growth rate index). There was significant (P < 0.001) heterogeneity in d among year-classes, with slowest growth (d = 3.798) exhibited by the 1983 year-class and fastest growth (d = 6.929) by the 1985 year-class, but there was no significant trend in d (P = 0.307) over year-classes. The variance of residuals from regression, s^2(reg), ranged from 0.2032 for the 1978 year-class to 0.0075 for the 1992 year-class, and showed a significant (P = 0.0001) logarithmic decrease over the year-classes. This decline in variation among individuals was probably due to a shift toward sex ratios dominated by one sex (females), improvements in rearing facilities, year-around control of seawater temperature which reduced disease incidence, improved diet, and reduced feeding levels. The relationship between w and scl (straight carapace length) was also described.Item Manual for Mass Wire Tagging of Hatchling Sea Turtles and the Detection of Internal Wire Tags(National Oceanic and Atmospheric Administration National Marine Fisheries Service, 1997-07) Higgins, Benjamin M.; Robertson, Bradley A.; Williams, Theodore D.Preparation of this manual was motivated by a need for a comprehensive field guide covering the application of internal wire tags in the mass tagging of sea turtle hatchlings and the detectiong of those tags later in the turtle's life. This manual is based primarily on the equipment and techniques used in the mass wire tagging of 3,336 Kemp's ridley (Lepidochelys kempii) hatchlings on the nesting beach at Rancho Nuevo, Mexico, during August, 1996 (Caillouet et. al., 1997). Although this illustrated manual thoroughly covers all the procedures necessary to successfully tag hatchlings with internal wire tags, it should not be substituted for formal training. It should be used to supplement formal training. This manual has been written assuming that the person(s) conducting the tagging are right handed. The automatic tag injectors are designed and manufactured for use by right handed persons. Left handed persons may achieve satisfactory results by holding the tagger upside down but this is not recommended. It is recommended that the entire manual be read thoroughly before any attempt is made to tag hatchlings. Pay special attention to the CAUTION and NOTE sections listed within the procedure instructions. The CAUTION and NOTE sections provide valuable information that may mean the difference between successful tagging and non-successful tagging. The manual is divided into four sections: 1. Background research involving internal wire tags; 2. Illustrated tagging techniques; 3. Illustrated tag detection techniques; 4. Appendices.