Current Search: Loggerhead turtle--Breeding (x)
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Title
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Sex determination of loggerhead sea turtles (Caretta caretta) via hormonal analysis by high performance liquid chromatography.
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Creator
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Botterill, Brooke L., Florida Atlantic University, Milton, Sarah L.
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Abstract/Description
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Sea turtles have temperature-dependent sex determination, with males being produced at cooler temperatures and females at warmer ones. Thus, sex ratios are often estimated on average nest temperatures, but this is unreliable. Therefore, many studies have begun to look to alternative methods to identify sex ratios. Other methods used to determine sex require hatchling sacrifice or are labor intensive. This study utilized high performance liquid chromatography (HPLC) to investigate correlations...
Show moreSea turtles have temperature-dependent sex determination, with males being produced at cooler temperatures and females at warmer ones. Thus, sex ratios are often estimated on average nest temperatures, but this is unreliable. Therefore, many studies have begun to look to alternative methods to identify sex ratios. Other methods used to determine sex require hatchling sacrifice or are labor intensive. This study utilized high performance liquid chromatography (HPLC) to investigate correlations between steroid hormone levels in hatchling plasma and allantoic fluid, nest temperature and sex. Hatchling sex was determined laparoscopically to ground-truth hormone profiles. No correlation was found between hormones, nest temperature and sex. However, as hormones were readily detectable by HPLC, the technique may be applicable to juvenile or adult turtles with mature profiles.
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Date Issued
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2005
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PURL
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http://purl.flvc.org/fcla/dt/13284
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Subject Headings
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Sea turtles--Nests--United States, Loggerhead turtle--Breeding, Sex (Biology), High performance liquid chromatography
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Format
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Document (PDF)
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Title
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Determination of sex ratios and their relationship to nest temperature of loggerhead sea turtle (Caretta caretta, L.) hatchlings produced along the southeastern Atlantic coast of the United States.
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Creator
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Blair, Kimberly., Florida Atlantic University, Wyneken, Jeanette
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Abstract/Description
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The sex ratios of hatchling loggerheads (Caretta caretta) were determined to provide robust assessments of regional and seasonal contributions of males and females to the population. Hatchlings from nests along the Atlantic coastline were raised to 120 g, sexed laparoscopically and verified histologically. Sex ratios differed at the beach, subseason, and subpopulation levels. There was no difference in overall sex ratios between the two study years. Average nest temperature and incubation...
Show moreThe sex ratios of hatchling loggerheads (Caretta caretta) were determined to provide robust assessments of regional and seasonal contributions of males and females to the population. Hatchlings from nests along the Atlantic coastline were raised to 120 g, sexed laparoscopically and verified histologically. Sex ratios differed at the beach, subseason, and subpopulation levels. There was no difference in overall sex ratios between the two study years. Average nest temperature and incubation durations were not accurate sex ratio correlates. Temperatures that produced female biased or male biased sex ratios overlapped in ranges with those producing a single sex. I found that the Transitional Range of Temperatures for loggerhead sea turtles is approximately 26.5°C--32°C, and the best correlation between average temperature and sex ratio occurred at 50--65% of incubation. Further studies are needed to define the roles of other environmental factors or the responses of tissues in loggerhead sex determination.
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Date Issued
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2005
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PURL
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http://purl.flvc.org/fcla/dt/13197
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Subject Headings
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Sea turtles--Nests--United States, Sex (Biology), Sea turtles--Atlantic Coast (U S ), Loggerhead turtle--Nests, Loggerhead turtle--Breeding
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Format
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Document (PDF)
