Determination of relative age, sex, and sex ratio of the Malayan box turtle (Coura amboinensis Daudin) in Pinaglubayan River, Polillo Island, Quezon, Philippines
2003
Alviola, P.L. | Cosico, E.A. | Eres, E.G. (Philippines Univ. Los Banos, College, Laguna (Philippines). Museum of Natural History)
Fifty-four individuals of Malayan Box Turtle (Coura amboinensis Daudin) have been marked, examined and measured in Pinaglubayan River, Polillo Island, Quezon, Philippines. They consisted of eight juveniles, 16 sub-adults, and 30 adults based on the ratio between the length and width of the carapace. Male individuals show plastral concavity in the media portion of the hypoplastral and xiphiplastral plates. The over-all sex ratio is 1:1. The presence of leeches in the carapace and plastron of juveniles (62.5%) supported the observations that juveniles are the most aquatic members of the population while the sub-adult turtles are the most terrestial based on the presence of dog nibbling marks in their carapace marginal scutes in 50% of the collected specimens
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