First Assessment of the Sex Ratio for an East Pacific Green Sea Turtle Foraging Aggregation: Validation and Application of a Testosterone ELISA

Determining sex ratios of endangered populations is important for wildlife management, particularly species subject to sex-specific threats or that exhibit temperature-dependent sex determination. Sea turtle sex is determined by incubation temperature and individuals lack external sex-based traits u...

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Vydané v:PloS one Ročník 10; číslo 10; s. e0138861
Hlavní autori: Allen, Camryn D., Robbins, Michelle N., Eguchi, Tomoharu, Owens, David W., Meylan, Anne B., Meylan, Peter A., Kellar, Nicholas M., Schwenter, Jeffrey A., Nollens, Hendrik H., LeRoux, Robin A., Dutton, Peter H., Seminoff, Jeffrey A.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States Public Library of Science 14.10.2015
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Abstract Determining sex ratios of endangered populations is important for wildlife management, particularly species subject to sex-specific threats or that exhibit temperature-dependent sex determination. Sea turtle sex is determined by incubation temperature and individuals lack external sex-based traits until sexual maturity. Previous research utilized serum/plasma testosterone radioimmunoassays (RIA) to determine sex in immature/juvenile sea turtles. However, there has been a growing application of enzyme-linked immunosorbent assay (ELISA) for wildlife endocrinology studies, but no study on sea turtles has compared the results of ELISA and RIA. This study provides the first sex ratio for a threatened East Pacific green sea turtle (Chelonia mydas) foraging aggregation, a critical step for future management of this species. Here, we validate a testosterone ELISA and compare results between RIA and ELISA of duplicate samples. The ELISA demonstrated excellent correspondence with the RIA for providing testosterone concentrations for sex determination. Neither assay proved reliable for predicting the sex of reproductively active females with increased testosterone production. We then applied ELISA to examine the sex ratio of 69 green turtles foraging in San Diego Bay, California. Of 45 immature turtles sampled, sex could not be determined for three turtles because testosterone concentrations fell between the ranges for either sex (females: 4.1-113.1 pg/mL, males: 198.4-2,613.0 pg/mL) and these turtles were not subsequently recaptured to enable sex determination; using a Bayesian model to predict probabilities of turtle sex we predicted all three 'unknowns' were female (> 0.86). Additionally, the model assigned all turtles with their correct sex (if determined at recapture) with 100% accuracy. Results indicated a female bias (2.83F:1M) among all turtles in the aggregation; when focusing only on putative immature turtles the sex ratio was 3.5F:1M. With appropriate validation, ELISA sexing could be applied to other sea turtle species, and serve as a crucial conservation tool.
AbstractList Determining sex ratios of endangered populations is important for wildlife management, particularly species subject to sex-specific threats or that exhibit temperature-dependent sex determination. Sea turtle sex is determined by incubation temperature and individuals lack external sex-based traits until sexual maturity. Previous research utilized serum/plasma testosterone radioimmunoassays (RIA) to determine sex in immature/juvenile sea turtles. However, there has been a growing application of enzyme-linked immunosorbent assay (ELISA) for wildlife endocrinology studies, but no study on sea turtles has compared the results of ELISA and RIA. This study provides the first sex ratio for a threatened East Pacific green sea turtle (Chelonia mydas) foraging aggregation, a critical step for future management of this species. Here, we validate a testosterone ELISA and compare results between RIA and ELISA of duplicate samples. The ELISA demonstrated excellent correspondence with the RIA for providing testosterone concentrations for sex determination. Neither assay proved reliable for predicting the sex of reproductively active females with increased testosterone production. We then applied ELISA to examine the sex ratio of 69 green turtles foraging in San Diego Bay, California. Of 45 immature turtles sampled, sex could not be determined for three turtles because testosterone concentrations fell between the ranges for either sex (females: 4.1-113.1 pg/mL, males: 198.4-2,613.0 pg/mL) and these turtles were not subsequently recaptured to enable sex determination; using a Bayesian model to predict probabilities of turtle sex we predicted all three 'unknowns' were female (> 0.86). Additionally, the model assigned all turtles with their correct sex (if determined at recapture) with 100% accuracy. Results indicated a female bias (2.83F:1M) among all turtles in the aggregation; when focusing only on putative immature turtles the sex ratio was 3.5F:1M. With appropriate validation, ELISA sexing could be applied to other sea turtle species, and serve as a crucial conservation tool.Determining sex ratios of endangered populations is important for wildlife management, particularly species subject to sex-specific threats or that exhibit temperature-dependent sex determination. Sea turtle sex is determined by incubation temperature and individuals lack external sex-based traits until sexual maturity. Previous research utilized serum/plasma testosterone radioimmunoassays (RIA) to determine sex in immature/juvenile sea turtles. However, there has been a growing application of enzyme-linked immunosorbent assay (ELISA) for wildlife endocrinology studies, but no study on sea turtles has compared the results of ELISA and RIA. This study provides the first sex ratio for a threatened East Pacific green sea turtle (Chelonia mydas) foraging aggregation, a critical step for future management of this species. Here, we validate a testosterone ELISA and compare results between RIA and ELISA of duplicate samples. The ELISA demonstrated excellent correspondence with the RIA for providing testosterone concentrations for sex determination. Neither assay proved reliable for predicting the sex of reproductively active females with increased testosterone production. We then applied ELISA to examine the sex ratio of 69 green turtles foraging in San Diego Bay, California. Of 45 immature turtles sampled, sex could not be determined for three turtles because testosterone concentrations fell between the ranges for either sex (females: 4.1-113.1 pg/mL, males: 198.4-2,613.0 pg/mL) and these turtles were not subsequently recaptured to enable sex determination; using a Bayesian model to predict probabilities of turtle sex we predicted all three 'unknowns' were female (> 0.86). Additionally, the model assigned all turtles with their correct sex (if determined at recapture) with 100% accuracy. Results indicated a female bias (2.83F:1M) among all turtles in the aggregation; when focusing only on putative immature turtles the sex ratio was 3.5F:1M. With appropriate validation, ELISA sexing could be applied to other sea turtle species, and serve as a crucial conservation tool.
Determining sex ratios of endangered populations is important for wildlife management, particularly species subject to sex-specific threats or that exhibit temperature-dependent sex determination. Sea turtle sex is determined by incubation temperature and individuals lack external sex-based traits until sexual maturity. Previous research utilized serum/plasma testosterone radioimmunoassays (RIA) to determine sex in immature/juvenile sea turtles. However, there has been a growing application of enzyme-linked immunosorbent assay (ELISA) for wildlife endocrinology studies, but no study on sea turtles has compared the results of ELISA and RIA. This study provides the first sex ratio for a threatened East Pacific green sea turtle (Chelonia mydas) foraging aggregation, a critical step for future management of this species. Here, we validate a testosterone ELISA and compare results between RIA and ELISA of duplicate samples. The ELISA demonstrated excellent correspondence with the RIA for providing testosterone concentrations for sex determination. Neither assay proved reliable for predicting the sex of reproductively active females with increased testosterone production. We then applied ELISA to examine the sex ratio of 69 green turtles foraging in San Diego Bay, California. Of 45 immature turtles sampled, sex could not be determined for three turtles because testosterone concentrations fell between the ranges for either sex (females: 4.1–113.1 pg/mL, males: 198.4–2,613.0 pg/mL) and these turtles were not subsequently recaptured to enable sex determination; using a Bayesian model to predict probabilities of turtle sex we predicted all three ‘unknowns’ were female (> 0.86). Additionally, the model assigned all turtles with their correct sex (if determined at recapture) with 100% accuracy. Results indicated a female bias (2.83F:1M) among all turtles in the aggregation; when focusing only on putative immature turtles the sex ratio was 3.5F:1M. With appropriate validation, ELISA sexing could be applied to other sea turtle species, and serve as a crucial conservation tool.
Audience Academic
Author Allen, Camryn D.
Robbins, Michelle N.
Eguchi, Tomoharu
LeRoux, Robin A.
Owens, David W.
Kellar, Nicholas M.
Schwenter, Jeffrey A.
Dutton, Peter H.
Meylan, Anne B.
Meylan, Peter A.
Seminoff, Jeffrey A.
Nollens, Hendrik H.
AuthorAffiliation 2 Grice Marine Lab, University of Charleston South Carolina, Charleston, South Carolina, United States of America
3 Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute, St. Petersburg, Florida, United States of America
1 Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, La Jolla, California, United States of America
5 Veterinary Services, SeaWorld San Diego, San Diego, California, United States of America
Sonoma State University, UNITED STATES
4 Natural Sciences, Eckerd College, St. Petersburg, Florida, United States of America
AuthorAffiliation_xml – name: 3 Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute, St. Petersburg, Florida, United States of America
– name: 5 Veterinary Services, SeaWorld San Diego, San Diego, California, United States of America
– name: 4 Natural Sciences, Eckerd College, St. Petersburg, Florida, United States of America
– name: 2 Grice Marine Lab, University of Charleston South Carolina, Charleston, South Carolina, United States of America
– name: 1 Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, La Jolla, California, United States of America
– name: Sonoma State University, UNITED STATES
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  givenname: Camryn D.
  surname: Allen
  fullname: Allen, Camryn D.
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  givenname: Michelle N.
  surname: Robbins
  fullname: Robbins, Michelle N.
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  givenname: Tomoharu
  surname: Eguchi
  fullname: Eguchi, Tomoharu
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  givenname: David W.
  surname: Owens
  fullname: Owens, David W.
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  fullname: Meylan, Anne B.
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  surname: Meylan
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  surname: Kellar
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  surname: Dutton
  fullname: Dutton, Peter H.
– sequence: 12
  givenname: Jeffrey A.
  surname: Seminoff
  fullname: Seminoff, Jeffrey A.
BackLink https://www.ncbi.nlm.nih.gov/pubmed/26465620$$D View this record in MEDLINE/PubMed
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Conceived and designed the experiments: CDA. Performed the experiments: CDA MNR J. A. Schwenter. Analyzed the data: CDA MNR TE NMK J. A. Schwenter. Contributed reagents/materials/analysis tools: TE DWO ABM PAM NMK J. A. Schwenter HHN PHD. Wrote the paper: CDA MNR TE DWO ABM PAM NMK J. A. Schwenter HHN RAL PHD J. A. Seminoff.
Competing Interests: The authors have declared that no competing interests exist.
OpenAccessLink https://doaj.org/article/8c0dfbde052f4cddb7cab6495fd29a41
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Snippet Determining sex ratios of endangered populations is important for wildlife management, particularly species subject to sex-specific threats or that exhibit...
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doaj
pubmedcentral
proquest
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SourceType Open Website
Open Access Repository
Aggregation Database
Index Database
Enrichment Source
StartPage e0138861
SubjectTerms Agglomeration
Animal Distribution - physiology
Animals
Aquatic reptiles
Bayes Theorem
Bayesian analysis
California
Caretta caretta
Chelonia
Chelonia mydas
Chelydra serpentina
Climate change
Comparative analysis
Conservation
Demography
Dermochelys coriacea
Embryos
Endangered populations
Endangered Species
Endocrinology
Enzyme-linked immunosorbent assay
Enzyme-Linked Immunosorbent Assay - standards
Enzyme-Linked Immunosorbent Assay - veterinary
Eretmochelys imbricata
Female
Females
Fisheries
Green turtle
Laparoscopy
Male
Males
Marine mammals
Mathematical models
Physiological aspects
Radioimmunoassay
Reptiles & amphibians
Science
Sea turtles
Sensitivity and Specificity
Sex
Sex determination
Sex Determination Processes - physiology
Sex Ratio
Sexes
Sexing
Sexual maturity
Species
Temperature
Temperature dependence
Testosterone
Testosterone - blood
Turtles - physiology
Wildlife
Wildlife conservation
Wildlife management
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Title First Assessment of the Sex Ratio for an East Pacific Green Sea Turtle Foraging Aggregation: Validation and Application of a Testosterone ELISA
URI https://www.ncbi.nlm.nih.gov/pubmed/26465620
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http://dx.doi.org/10.1371/journal.pone.0138861
Volume 10
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