Edad y crecimiento en Bufo arenarum (Anura: Bufonidae)


Cuadernos de Herpetología 5 (5): 25-31, 1990


A sample of 88 (45 female and 43 males) adults and subadults toads of Bufo arenarum has been collected in Buenos Aires province, Argentine. There has been studied the age and increments in growth by the squeletochronological method in the subdistal phalange of the third finger from the hand. Statistical regression analysis (linear and power models) were performed. These studies showed that: a) snout-vent (total length, LT=y) and head width (AC=y) have strong positive correlation to the estimate age (number of LAC present in the bone; E=x). The power model shows the best fitting to the female data and the linear model provide good fits to the male data. All correlation coefficients are statistically significant at 0,01 probability level. b) The equation of von Bertalanffy was fitted to the data (LT; AC): Males growth showed a weak fitting to von Bertalanffy. Female corporal growth (LT and AC) showed the best fitting to von Bertalanffy equation. It can be used 90-110 mm as the length at sexual maturity (or sexual maturity size). c) The endosteal resorption begins before males reach the sexual maturity (E IV). In the females the endosteal resorption starts after the sexual maturity (E V). d) The third LAC could be completely resorbed at E VI.

Palabras clave:

esqueletocronología; Bufo arenarum

Echeverría, D.D. & Filipello, A.M. 1990. Edad y crecimiento en Bufo arenarum (Anura: Bufonidae). Cuadernos de Herpetología 5: 25-31.