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The environmental characteristics of nesting sites of sea turtles may directly interfere with the egg hatchling success. The objective of the present study was to evaluate the factors that affect the success of hatchling in the nests of the loggerhead sea turtle ( Caretta caretta ). Data from 37 nests of  C. caretta  from the coast of Mata de S&amp;atilde;o Jo&amp;atilde;o, Bahia, northeastern Brazil, were obtained from TAMAR, Sau&amp;iacute;pe station. Samples of sand were collected in each nest to determine the granulometry. A significant negative relationship was found between the stillborn rate and the fine sand ratio (r 2  = 0.119;  p  = 0.036), indicating that a larger fraction of fine sand had a positive effect on nest hatchling success. The egg laying date also had a significant influence on the rate of stillbirths (r 2  = 0.163;  p  = 0.013), with a trend towards a higher stillbirth rate, the later the laying date of the eggs. There is indication that the transfer of eggs to sites with more favorable characteristics may be considered as a potential alternative to increase the hatchling success rate of  C. caretta  eggs.

Effect of sand granulometry on the egg hatchling success of the sea turtle Caretta caretta