Journals / Hacettepe Journal of Biology and Chemistry / 2014 / Cilt: 42 - Sayı: 4

Temperature Profiles And Sex Ratio Estimation For Green Turtle (Chelonia mydas) Hatchlings On Sugözü Beaches

Sugözü Kumsalları’ndaki̇ Sıcaklık Profilleri ve Yeşil Kaplumbağa (Chelonia mydas) Yavrularında Eşey Oranı Tahmini

Pages
531–536
Publication Date
2022-10-17
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The sex ratio in green turtle hatchlings in the area investigated according to the temperature profile was prominently biased toward females.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, the effect of nest temperature and surrounding sand temperature on sexual differentiation were examined for green turtle (Chelonia mydas) hatchlings on Sugözü Beaches (Adana, Turkey) in 2005 nesting season.
📊
Key Findings & Data:Nest temperatures were found to be higher than the surrounding sand temperatures, especially during the middle and last third period of incubation (respectively, 0.6°C and 1.9°C).
💡
Conclusion & Impact:The sex ratio in green turtle hatchlings in the area investigated according to the temperature profile was prominently biased toward females.
🔬Design:Research Article
📍Scope:2005 Verileri
⚙️Variables:Domain Parameters

Abstract

In this study, the effect of nest temperature and surrounding sand temperature on sexual differentiation were examined for green turtle (Chelonia mydas) hatchlings on Sugözü Beaches (Adana, Turkey) in 2005 nesting season. Nest temperatures were found to be higher than the surrounding sand temperatures, especially during the middle and last third period of incubation (respectively, 0.6°C and 1.9°C). The nest temperature was mostly related to the incubation duration and this was followed by the distance of the nest from the sea and the clutch size. Any relationship between nest temperature and nest depth was not found. Nest temperatures (ranged between 29.4-31.6°C) and middle third temperatures (ranged between 29.5-31.3°C) were measured above 28.9°C, which is the pivotal temperature. The sex ratio in green turtle hatchlings in the area investigated according to the temperature profile was prominently biased toward females.

Özet

Bu çalışmada, 2005 yuvalama sezonunda Sugözü Kumsalları’ndaki (Adana, Türkiye) yuva ve çevresindeki kumsal sıcaklıklarının yeşil kaplumbağa (Chelonia mydas) yavrularındaki eşeysel farklılşmaya olan etkisi incelenmiştir. Yuva sıcaklıkları, özellikle gelişimin orta ve son trimesterinde (sırasıyla 0.6°C ve 1.9°C) yuvayı çevreleyen kumsal sıcaklıklarından yüksek bulunmuştur. Yuva sıcaklıkları en yüksek olarak inkübasyon süresi ile ilişkilidir, bunu yuvanın denizden uzaklığı ve kuluçka büyüklüğü izlemektedir. Yuva sıcaklığı ve yuva derinliği arasında bir ilişki bulunamamıştır. Yuva (29.4-31.6°C arasında) ve orta trimester (29.5-31.3°C arasında) sıcaklıkları 28.9°C olan pivotal sıcaklık derecesinin üzerinde ölçülmüştür. Sıcaklık profillerine gore, çalışma alanındaki yeşil kaplumbağa yavrularındaki cinsiyet oranı belirgin şekilde dişi yönlüdür.

🔖

Cite This Article

Candan, O., Kolankaya, D. (2022). Temperature Profiles And Sex Ratio Estimation For Green Turtle (Chelonia mydas) Hatchlings On Sugözü Beaches. Hacettepe Journal of Biology and Chemistry, Cilt: 42 - Sayı: 4, 531–536. https://ajindex.com/articles/529181

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (15)

  1. J.J. Bull, Sex Determination in Reptiles. Q Rev Biol, (1980) 3
  2. C.L. Yntema, N. Mrosovsky, Sexual-Differentiation in Hatchling Loggerheads (Caretta-Caretta) Incubated at Different Controlled Temperatures. Herpetologica, 36,(1980) 33
  3. N. Mrosovsky, C. Pieau, Transitional range of temperature, pivotal temperatures and thermosensitive stages for sex determination in reptiles. Amphibia-Reptilia, 12 (1991) 169
  4. N. Mrosovsky, C.L. Yntema, Temperature-Dependence of Sexual-Differentiation in Sea Turtles - Implications for Conservation Practices. Biol Conserv 18, (1980) 271
  5. A.C. Broderick, B.J. Godley and G.C. Hays, Metabolic heating and the prediction of sex ratios for green turtles (Chelonia mydas). Physiol Biochem Zool, 74 (2001) 161
  6. B. Lazar, G. Lackovic, P. Casale, D. Freggi, N. Tvrtkovic, Histological validation of gonad gross morphology to sex juvenile loggerhead sea turtles (Caretta caretta). Herpetol J, 18 (2008) 137
  7. S.A. Ceriani and J. Wyneken, Comparative morphology and sex identification of the reproductive system in formalin-preserved sea turtle specimens. Zoology, 111 (2008) 179
  8. N. Mrosovsky, M. Benabib, An Assessment of 2 Methods of Sexing Hatchling Sea-Turtles. Copeia, 2 (1990) 589
  9. N. Mrosovsky, S.J. Kamel, C.E. Diez, R.P. van Dam, Methods of estimating natural sex ratios of sea turtles from incubation temperatures and laboratory data. Endanger Species Res, 8 (2009) 147
  10. E.A. Standora, J.R. Spotila, Temperature-Dependent Sex Determination in Sea Turtles. Copeia 3, (1985) 711
  11. N.T. Booth and K. Astill, Temperature variation within and between nests of the green sea turtle, Chelonia mydas (Chelonia:Cheloniidae) on Heron Island, Great Barrier Reef. Aust J Zool, 49 (2001) 71
  12. S.L. Milton, A.A. Schulman, P.L. Lutz, The effect of beach nourishment with aragonite versus silicate sand on beach temperature and loggerhead sea turtle nesting success. J Coastal Res, 13 (1997) 904
  13. B.J. Godley, A.C. Broderick, F. Glen and G.C. Hays, Temperature-dependent sex determination of Ascension Island green turtles. Mar Ecol Prog Ser, 226,(2002) 115
  14. D. T. Booth, C. Freeman, Sand and nest temperatures and an estimate of hatchling sex ratio from the Heron Island green turtle (Chelonia mydas) rookery, Southern Great Barrier Reef. Coral Reefs, 25 (2006) 629
  15. P. Casale, G. Gerosa and S.V. Yerli, Female-biased Primary Sex Ratio of the Green Turtle, Chelonia mydas, Estimated Through Sand Temperatures at Akyatan, Turkey. Z