Year 2017, Volume 38, Issue 4, Pages 60 - 67 2017-12-08

A Preliminary Study of Using Some Nest Characteristics as Indicators for the Size of Green Turtle (Chelonia mydas) Hatchlings
Yeşil Deniz Kaplumbağası (Chelonia mydas) Yavrularının Büyüklüğü için Indikatör Olarak Bazı Yuva Özelliklerinin Kullanılmasıyla İlgili Bir Ön Çalışma

Bektaş SÖNMEZ [1] , Şükran YALÇIN ÖZDILEK [2]

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Body size can increase or decrease the chances of survival of sea turtle hatchlings. Given the importance of body size for hatchling survival, it would be useful method for conservationists to be able to estimate, using indicators, hatchling size quickly without having to disturb hatchlings. Some nest characteristics such as clutch size, distance of the nest from the sea, incubation period and nest depth were tested for correlations with hatchling size in a population of Chelonia mydas in Turkey to determine if they can be indicators for hatchling size. Our results showed that none of these nest characteristics were suitable. However; incubation period showed weakly correlated with straight carapace size.When the best fitting linear model of the effect of principal components (PCs), derived from collinear nest characteristics, on hatchling size was constructed, the model only explained 19.75 % of the variance in hatchling size. PC2 had a significant effect on straight carapace length (SCL) and the interaction between PC1 and PC2 had significant effects on SCL and curved carapace length (CCL) in the univariate analysis. F-test results that suggested the models had not significant predictive capabilities. Perhaps there may be other factors that are more suitable as indicators, or that hatchling size is influenced by a complex interplay among several factors, such that it is not possible to identify a few key factors to be used as indicators.

Vücut büyüklüğü, deniz kaplumbağası yavrularının hayatta kalma şansını artırabilir veya azaltabilir. Deniz kaplumbağası yavrusunun hayatta kalabilirliği için vücut büyüklüğünün önemi göz önüne alındığında, indikatör kullanılarak, yavru büyüklüğünün tahmin edilmesi koruma uzmanları için yararlı bir yöntem olacaktır. Türkiye'de Chelonia mydas popülasyonunda, yavru büyüklüğü için indikatör olup olmayacaklarını belirlemek amacıyla, yumurta sayısı, yuvanın denize olan uzaklığı, kuluçka süresi ve yuva derinliği gibi bazı yuva özellikleri yavru büyüklüğü ile korelasyona tabi tutuldu. Bulgularımız, bu yuva özelliklerinden hiçbirinin yavru büyüklüğünü tahmin etmek için uygun olmadığını göstermiştir. Ancak, kuluçka süresi, yavrunun düz karapas boyu ile zayıf bir korelasyon göstermiştir. Kollinear yuva özelliklerinden türetilen ana bileşenlerin (AB), yavru büyüklüğüne en iyi uyan doğrusal modeli oluşturulduğu zaman, model yavru büyüklüğündeki varyansın sadece % 19.75'ini açıkladı. AB2'nin doğru karapas boyu (DKB) üzerinde anlamlı bir etkisi vardı ve AB1 ile AB2 arasındaki etkileşim, tek değişkenli analizde DKB ve eğri karapas boyu (EKB) üzerinde belirgin etkilere sahipti. F-test sonuçları, modellerin belirgin öngörü yeteneğinin olmadığını önermektedir. Belki de, araştırılmayan diğer faktörler indikatör olarak daha uygun olabilir veya yavru büyüklüğü, indikatör olarak kullanılabilir ancak tespiti yapılamayan bir kaç temel faktör gibi çeşitli faktörler arasındaki karmaşık bir etkileşimden etkileniyordur.

  • [1]. Glen F., Broderick A.C., Godley B.J., Hays G.C. Incubation environment affects phenotype of naturally incubated green turtle hatchlings. Journal of the Marine Biological Association of the United Kingdom, 2003; 83: 1183-1186.
  • [2]. Burgess E.A., Booth D.T., Lanyon J.M. Swimming performance of hatchling green turtles is affected by incubation temperature. Coral Reefs, 2006; 25: 341-349. doi: 10.1007/s00338-006-0116-7
  • [3]. Booth D.T., Burgess E., McCosker J., Lanyon J.M. The influence of incubation temperature on post-hatching fitness characteristics of turtles. International Congress Series, 2004; 1275: 226-233. doi: 10.1016/j.ics.2004.08.057
  • [4]. Booth D.T. Influence of incubation temperature on hatchling phenotype in reptiles. Physiological and Biochemical Zoology, 2006; 79: 274-281. doi: 10.1086/499988
  • [5]. Sönmez B., Turan C., Yalçın-Özdilek Ş. The effect of relocation on the morphology of green turtle, Chelonia mydas (Linnaeus, 1758), hatchlings on Samandağ beach, Turkey. Zoology in the Middle East, 2011; 52: 29-38. doi: 10.1080/09397140.2011.10638476
  • [6]. Heink U. and Kowarik I. What are indicators ? On the definition of indicators in ecology and environmental planning. Ecological Indicators, 2010; 10: 584–593. doi: 10.1016/j.ecolind.2009.09.009
  • [7]. Niemeijer D. and de Groot R.S. A conceptual framework for selecting environmental indicator sets. Ecological Indicators, 2008; 8: 14–25. doi: 10.1016/j.ecolind.2006.11.012
  • [8]. Packard G.C. and Packard M.J. The physiological ecology of reptilian eggs and embryos. In: Gans, C. and Huey, R.B (eds), Biology of the Reptilia, Volume 16, (pp 524 - 605). Alan R. Liss. Press, 1988.
  • [9]. Candan O. and Kolankaya D. Sex ratio of green turtle (Chelonia mydas) hatchlings at Sugözü, Turkey: higher accuracy with pivotal incubation duration. Chelonian Conserv. Biol., 15 (2016), pp. 102-108.
  • [10]. Kılıç Ç and Candan O. Hatchling sex ratio, body weight and nest parameters for Chelonia mydas nesting on Sugözü beaches (Turkey) Anim. Biodivers. Conserv., 37 (2014), pp. 177-182
  • [11]. Özdemir, B. & Türkozan, O. Hatching success of original and hatchery nests of the green turtle, Chelonia mydas, in Northern Cyprus. Turkish Journal of Zoology, 2006; 30: 377-381.
  • [12]. Booth D.T., Feeney R., Shibata Y. Nest and maternal origin can influence morphology and locomotor performance of hatchling green turtles (Chelonia mydas) incubated in field nests. Marine Biology, 2013; 160: 127-137. doi: 10.1007/s00227-012-2070-y
  • [13]. Broderick A.C., Glen F., Godley B.J., Hays G.C. Estimating the number green and loggerhead turtles nesting annually in the Mediterranean. Oryx, 2002; 36: 227-235. doi: 10.1017/S0030605302000431
  • [14]. Wang Y., Naumann U., Wright S.T., Warton D.I. Mvabund - an R Package for model-based analysis of multivariate abundance data. Methods in Ecology and Evolution, 2012; 3: 471-474. doi: 10.1111/j.2041-210X.2012.00190.x
  • [15]. Horne C.R., Fuller W.J., Godley B.J., Rhodes K.A., Snape R., Stokes K.L., Broderick A.C. The effect of thermal variance on the phenotype of marine turtle offspring. Physiological and Biochemical Zoology, 2014; 87: 796–804. doi: 10.1086/678238
  • [16]. Godley, B.J., Broderick, A.C., Downie, J.R., Glen, F., Houghton, J.D., Kirkwood, I., Reece, S., Hays, G.C. Thermal conditions in nests of loggerhead turtles: Further evidence suggesting female skewed sex ratios of hatchling production in the Mediterranean. Journal of Experimental Marine Biology and Ecology, 2001; 263: 45-63. doi: 10.1016/S0022-0981(01)00269-6
  • [17]. Mickelson L.E. & Downie J.R. Influence of incubation temperature on morphology and locomotion performance of leatherback (Dermochelys coriacea) hatchlings. Canadian Journal of Zoology, 2010; 88: 359-368. doi: 10.1139/Z10-007
  • [18]. Packard G.C., Paukstis G.L., Boardman T.J., Gutzke W.H.N. Daily and seasonal variation in hydric conditions and temperature inside nests of common snapping turtles (Chelydra serpentina). Canadian Journal of Zoology, 1985; 63: 2422-2429. doi: 10.1139/z85-358
  • [19]. Delmas V., Bonnet X., Girondot M., Prévot-Julliard A.C. Varying hydric conditions during incubation influence egg water exchange and hatchling phenotype in the red-eared slider turtle. Physiological and Biochemical Zoology, 2008; 81:(3) 345–55. doi: 10.1086/529459
  • [20]. Mcgehee M.A. Effects of moisture on eggs and hatchlings of loggerhead sea turtles (Caretta caretta). Herpetologica, 1990; 46: 251-258.
Subjects Basic Sciences
Journal Section Natural Sciences
Authors

Author: Bektaş SÖNMEZ (Primary Author)

Author: Şükran YALÇIN ÖZDILEK

Bibtex @research article { csj363298, journal = {Cumhuriyet Science Journal}, issn = {2587-2680}, eissn = {2587-246X}, address = {Cumhuriyet University}, year = {2017}, volume = {38}, pages = {60 - 67}, doi = {10.17776/csj.363298}, title = {A Preliminary Study of Using Some Nest Characteristics as Indicators for the Size of Green Turtle (Chelonia mydas) Hatchlings}, key = {cite}, author = {SÖNMEZ, Bektaş and YALÇIN ÖZDILEK, Şükran} }
APA SÖNMEZ, B , YALÇIN ÖZDILEK, Ş . (2017). A Preliminary Study of Using Some Nest Characteristics as Indicators for the Size of Green Turtle (Chelonia mydas) Hatchlings. Cumhuriyet Science Journal, 38 (4), 60-67. DOI: 10.17776/csj.363298
MLA SÖNMEZ, B , YALÇIN ÖZDILEK, Ş . "A Preliminary Study of Using Some Nest Characteristics as Indicators for the Size of Green Turtle (Chelonia mydas) Hatchlings". Cumhuriyet Science Journal 38 (2017): 60-67 <http://dergipark.org.tr/csj/issue/32371/363298>
Chicago SÖNMEZ, B , YALÇIN ÖZDILEK, Ş . "A Preliminary Study of Using Some Nest Characteristics as Indicators for the Size of Green Turtle (Chelonia mydas) Hatchlings". Cumhuriyet Science Journal 38 (2017): 60-67
RIS TY - JOUR T1 - A Preliminary Study of Using Some Nest Characteristics as Indicators for the Size of Green Turtle (Chelonia mydas) Hatchlings AU - Bektaş SÖNMEZ , Şükran YALÇIN ÖZDILEK Y1 - 2017 PY - 2017 N1 - doi: 10.17776/csj.363298 DO - 10.17776/csj.363298 T2 - Cumhuriyet Science Journal JF - Journal JO - JOR SP - 60 EP - 67 VL - 38 IS - 4 SN - 2587-2680-2587-246X M3 - doi: 10.17776/csj.363298 UR - https://doi.org/10.17776/csj.363298 Y2 - 2017 ER -
EndNote %0 Cumhuriyet Science Journal A Preliminary Study of Using Some Nest Characteristics as Indicators for the Size of Green Turtle (Chelonia mydas) Hatchlings %A Bektaş SÖNMEZ , Şükran YALÇIN ÖZDILEK %T A Preliminary Study of Using Some Nest Characteristics as Indicators for the Size of Green Turtle (Chelonia mydas) Hatchlings %D 2017 %J Cumhuriyet Science Journal %P 2587-2680-2587-246X %V 38 %N 4 %R doi: 10.17776/csj.363298 %U 10.17776/csj.363298
ISNAD SÖNMEZ, Bektaş , YALÇIN ÖZDILEK, Şükran . "A Preliminary Study of Using Some Nest Characteristics as Indicators for the Size of Green Turtle (Chelonia mydas) Hatchlings". Cumhuriyet Science Journal 38 / 4 (December 2017): 60-67. https://doi.org/10.17776/csj.363298