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Embryonic Growth of the Green Iguana Iguana iguana
Robert E. Ricklefs and John Cullen
Vol. 1973, No. 2 (May 22, 1973), pp. 296-305
Stable URL: http://www.jstor.org/stable/1442968
Page Count: 10
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A series of green iguana embryos of known age is analyzed to assess growth rate, allometric relationships between linear measurements and energetic efficiency of development. These data are compared to embryonic development in the chicken. The iguana embryos grew at a constant exponential rate during most of the development period; their water content continually decreased. Relative growth rates of body components were more nearly similar to each other than in chicken embryos; the limbs grew relatively faster than the trunk and head. Growth rates of iguana embryos was much slower than chicken embryos and it was less efficient energetically. Data on postnatal growth indicate that growth rate varies seasonally and decreases by about 50% each year.