Biology of Turtles by Jeanette Wyneken, Matthew H. Godfrey

By Jeanette Wyneken, Matthew H. Godfrey

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3 Marine Turtles Of all of the turtle groups, skeletochronology has been applied most frequently to marine turtles. , 2001). Hence, skeletochronology has been the primary means of estimating age and inferring growth rates in these turtles. , 2006). , 2001; Snover & Hohn, 2004) and Kemp’s ridleys (Snover & Hohn, 2004). With the exception of leatherbacks, all of these studies used the humerus bone. Generally, LAGs are most clearly visible in the long bones, and the humerus is ideal as it is easily removed from dead animals and it has muscle insertion scars that create landmarks that allow for the identification of sectioning sites that are consistent (Snover & Hohn, 2004).

A Age determined by the observation of turtles nesting that had been raised in captivity for the first year of life, marked, and released. b Age determined by skeletochronology. c Age determined indirectly by analysis of growth records from mark-recapture study. d Age determined by counts of growth lines on scutes. e Age determined by a combination of growth line on plastral scutes and a growth model based on recapture data. f Age determined by a combination of scute growth lines and mark-recapture.

Comprehensive survey of carpacial ridge-specific genes in turtle implies co-option of some regulatory genes in carapace evolution, Evol. , 7, 3–17, 2005. , A reevaluation of early amniote phylogeny, Zool. J. Linn. , 113, 165–223, 1995. , Experimental analysis of the migration and differentiation of neuroblasts of the autonomic nervous system and of neuroectodermal mesenchymal derivatives, using a biological cell marking technique, Dev. , 41, 162–184, 1974. , Correlated progression and the origin of turtles, Nature, 379, 812–815, 1996.

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