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Narayanan, Abhishek
- Variation in Allometric Shell Growth and Relationship with Sexual Size Dimorphism in Repatriated Indian Star Tortoises (Geochelone elegans) (Reptilia: Testudinidae)
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1 No. 48, Ayodhya Nagar, Gaulkhed Road, Shegaon, District Buldhana 444 203, IN
1 No. 48, Ayodhya Nagar, Gaulkhed Road, Shegaon, District Buldhana 444 203, IN
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Current Science, Vol 110, No 2 (2016), Pagination: 206-213Abstract
This study assesses the rate and pattern of variation of allometric shell growth in Indian star tortoise Geochelone elegans. Morphometric measurements of 83 Indian star tortoises were taken over 6 months. The anal notch measurements correctly classified the sex of the individuals based on the results of multiple regression analysis and chi-square test. Discriminant analysis clustered the growth rates into three age groups. The shell growth across sexes varied with age and morphometric measurements of the shell characters (length in males; width in females). The increase in straight carapace width and plastron length (PL) was significantly different across sexes (females > males and males > females respectively) in 5-7 years age class only. A pronounced increase in PL in males and overall width in females only in the age class of 7-9 years may indicate the influence of sexual selection. The difference in allometric shell growth (in males and females) may thus lead to sexually dimorphic adults.Keywords
Geochelone elegans, Morphometric Differentiation, Sexual Dimorphism, Shell Growth.Full Text
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