Thesis (M.S.)--Oregon State University, 2010. / Printout. Includes bibliographical references (leaves 66-71). Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 56-60). Also available on the World Wide Web.

Thesis (Ph.D.) - James Cook University, 2006. / Typescript (photocopy) Bibliography: p. 111-126.

The status and distribution of Loggerhead Shrikes (Lanius ludovicianus) in southern Ontario and Quebec was studied during the 1991 and 1992 breeding seasons. Shrikes returned from wintering areas in April and egg laying began by the end of April and early May. The population of Loggerhead Shrikes in eastern Ontario was found to consist of 51 pairs distributed over three core areas, each associated with a limestone plain. Only one pair of birds was found breeding in the province of Quebec in 1991 and 2 in 1992. Shrikes nested in hawthorn (Crataegus spp.), red cedar (Juniperus virginiana) and other species, most often inactively grazed pastures. Suitable historic nesting sites were reoccupied and there was a high rate of reoccupancy of 1991 sites in 1992. Breeding territory selection was affected by the amount of habitat fragmentation around a site, but nest site selection appeared to be random within a suitable territory. Shrikes nesting in Ontario have a high rate of reproductive success (58 to 93%). The number of fledglings per nest is high, however, only half survive the 3 to 4 weeks needed to become independent of their parents (2.30 of 3.90 in 1991 and 2.50 of 4.17 in 1992). Shrikes were found to renest several times and double brooding was observed. More time was spent hunting and feeding mates and young as the demand for food increased through the reproductive cycle.

Thesis (M.S.)--Georgia Southern University, 2007. / "A thesis submitted to the Graduate Faculty of Georgia Southern University in partial fulfillment of the requirements for the degree Master of Science." In Biology, under the direction of David Rostal. ETD. Electronic version approved: December 2007. Includes bibliographical references (p. 54-59) and appendices.

Thesis (M.S.)--Georgia Southern University, 2004. / ETD. "A thesis submitted to the Graduate Faculty of Georgia Southern University in partial fulfillment of the requirements for the degree Master of Science." Includes bibliographical references.

Hatchling loggerhead turtles emerge from subsurface nests on the beach at night, crawl down the beach and enter the sea. Recently, increases in a floating algae (Sargassum) has been reported in the mid-Atlantic and the Caribbean, resulting in large algal wrack on Florida beaches. The purpose of my study was to determine if these accumulations acted as a barrier, preventing hatchlings from completing their crawl to the sea. To address this issue I recorded seasonal changes in Sargassum density and directly observed when, and under what circumstances, hatchlings could cross the wrack. There was a significant overlap between when Sargassum accumulation peaked and when the turtles emerged, with the result that hatchling recruitment was significantly reduced (by~22%) during the 2020 nesting season. I conclude that algal accumulations represent a significant threat that may impede the recovery of loggerhead populations, that are currently threatened or endangered worldwide. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2021. / FAU Electronic Theses and Dissertations Collection

No description available.

Clutches of eggs wore collected from nesting loggerhead sea turtles (Caretta caretta caretta) on Merritt Island, Florida, during June - August 1977. Of these, 46 clutches were selected for experimentation to determine the extent to which certain factors affect hatching success. Twelve clutches were divided into subsamples which were incubated in sand maintained at 0, 25, 50, 75, and 100% moisture. Another twelve clutches were divided into subsamples and incubated in sand kept moist with the following percentages of seawater: 0 (distilled water), 25, 50, 75, and 100%; subsamples from four other clutches were subjected to the effects of one tidal inundation. Eggs from four of the clutches used in the moisture and salinity experiments were monitored for changes in size. Fifteen clutches were divided into subsamples which were kept in incubators maintained at 20, 24, 27, 30, 32, 35, and 38°C; subsamples from seven of these clutches were moved from unfavorable to optimal temperatures to study their ability to recover from stress. Three clutches were selected for an experiment to determine the effects of handling on hatching success; the following year, another five clutches were used for similar studies. Some of the hatchling turtles produced in this project were abnormal, and these were discussed in depth. From the experiments, it was determined that 25% moisture, 0-25% seawater, and 27°C produced the maximum percent hatch. The effects of handling on hatching success depended variably on the time and manner of handling. The optimum values indicated in the experiments closely approximated values for moisture, salinity, and temperature obtained from natural turtle nests on the beach.

No description available.