Evaluating Noninvasive Methods of Sex Identification in Green Sea Turtle (Chelonia mydas) Hatchlings

Xia, Zhong Rong; Li, Pi Peng; Gu, He Xiang; Fong, Jonathan J.; Zhao, Er Mi

doi:10.2744/ccb-0852.1

Cited by 18 publications

(20 citation statements)

References 24 publications

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“…A new promising method to estimate the sex of hatchlings based on steroids extracted from eggshell is a non-lethal sexing method (Xia et al 2011, Kobayashi et al 2015, but the approach remains to be validated. Many primary sex ratio studies use indirect proxies such as average temperatures during incubation (entire or middle-third) to cover all the nesting season or several seasons.…”

Section: Outputs By Species Ocean Basin and Publication Venuementioning

confidence: 99%

Are we working towards global research priorities for management and conservation of sea turtles?

Rees¹,

Alfaro‐Shigueto²,

Barata³

et al. 2016

Endang. Species. Res.

248

161

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In 2010, an international group of 35 sea turtle researchers refined an initial list of more than 200 research questions into 20 metaquestions that were considered key for management and conservation of sea turtles. These were classified under 5 categories: reproductive biology, biogeography, population ecology, threats and conservation strategies. To obtain a picture of how research is being focused towards these key questions, we undertook a systematic review of the peer-reviewed literature (2014 and 2015) attributing papers to the original 20 questions. In total, we reviewed 605 articles in full and from these 355 (59%) were judged to substantively address the 20 key questions, with others focusing on basic science and monitoring. Progress to answering the 20 questions was not uniform, and there were biases regarding focal turtle species, geographic scope and publication outlet. Whilst it offers some meaningful indications as to effort, quantifying peer-reviewed literature output is ob viously not the only, and possibly not the best, metric for understanding progress towards informing key conservation and management goals. Along with the literature review, an international group based on the original project consortium was assigned to critically summarise recent progress towards answering each of the 20 questions. We found that significant research is being expended towards global priorities for management and conservation of sea turtles. Although highly variable, there has been significant progress in all the key questions identified in 2010. Undertaking this critical review has highlighted that it may be timely to undertake one or more new prioritizing exercises. For this to have maximal benefit we make a range of recommendations for its execution. These include a far greater engagement with social sciences, widening the pool of contributors and focussing the questions, perhaps disaggregating ecology and conservation.

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Section: Outputs By Species Ocean Basin and Publication Venuementioning

confidence: 99%

Are we working towards global research priorities for management and conservation of sea turtles?

Rees¹,

Alfaro‐Shigueto²,

Barata³

et al. 2016

Endang. Species. Res.

248

161

View full text Add to dashboard Cite

show abstract

“…To date, this method has been successfully used for sex identification of the Arrau River turtle (Podocnemis expansa), loggerhead sea turtle (Caretta caretta), and green sea turtle (Chelonia mydas). 5,6 Therefore, the primary method of classifying sex remains the direct observation of gonads in hatchlings and juveniles. Immature ovarian follicles and nonactive testes are visible inside the coelomic cavity of even young turtles.…”

Section: Introductionmentioning

confidence: 99%

Gender Identification by Cloacoscopy and Cystoscopy in Juvenile Chelonians

Silvestre¹,

Bargalló²,

Grifols³

2015

Veterinary Clinics of North America: Exotic Animal Practice

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“…However, it is impossible to observe gonads by cystoscopy in the loggerhead sea turtles because of the thickness of the bladder wall. Sex determination in juvenile sea turtles is a major challenge (Wibbels et al 1987;Wibbels 2003;Xia et al 2011). A widely used method of sex determination in chelonians is coelioscopy (Hernandez-Divers et al 2009;Martínez-Silvestre et al 2015), which is a mini-invasive method but cloacoscopy could be an even less invasive method for this purpose.…”

Section: Resultsmentioning

confidence: 99%

Description of cloacoscopy in the loggerhead sea turtle (Caretta caretta)

et al. 2016

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The aim of the study was to describe cloacoscopy in the loggerhead turtle (Caretta caretta) and to evaluate its efficacy in clinical practice. Cloacoscopy was performed on 31 turtles, 23 females and 8 males. Thirty minutes before anaesthesia, meloxicam (0.4 mg/kg) was administered intramuscularly. Turtles were anaesthetised with a combination of 0.04 mg/kg dexmedetomidine and 4 mg/kg ketamine administered intramuscularly. Cloacoscopy was performed with a diagnostic telescope (10 mm diameter, 30 cm long, 0°, with an operating sheath) or with a flexible colonoscope (13 mm diameter, 160 cm long). Turtles were placed in dorsal recumbence and endoscope was inserted through the vent. In the distal part of the proctodeum, phallus or clitoris were easily visualized. A finger and thumb were placed around the vent to act as a valve in order to control the fluid infusion. Flushing the cloaca with warm saline and 0.6% lidocaine allowed clear view. The urethral orifice was located centrally within the urogenital sinus. Further proximally, the slit of the urodeum with the distal sphincter of the colon could be visualized. Passing gently through the urethral orifice allowed direct visualization of the urinary bladder. After withdrawing and re-directing the endoscope into the coprodeum, the terminal part of the intestine was reached. From 31 loggerhead turtles examined, fishing lines were found in 23 animals. Cloacoscopy proved to be a feasible diagnostic method and it is suggested as a routine diagnostic tool for clinical assessment of loggerhead turtle patients.

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Evaluating Noninvasive Methods of Sex Identification in Green Sea Turtle (Chelonia mydas) Hatchlings

Cited by 18 publications

References 24 publications

Are we working towards global research priorities for management and conservation of sea turtles?

Are we working towards global research priorities for management and conservation of sea turtles?

Gender Identification by Cloacoscopy and Cystoscopy in Juvenile Chelonians

Description of cloacoscopy in the loggerhead sea turtle (Caretta caretta)

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