Lizard Reproductive Effort: Caloric Estimates and Comments on Its Evolution

摘要: The energy content of eggs 10 lizard species was determined and used as a measure reproductive effort (ratio clutch calories to body calories). Values for ranged from 5.87 7.20 cal/mg ash-free dry weight (x = 6.37). Species differences in going into reproduction during breeding season, however, were primarily due size frequency between species. Correlation analysis three mea- sures effort, including the preceding, suite demographic variables revealed only one significant correlation (negative) ratio mean annual adult survivorship. allocated comparison total expenditure estimated investigated. Sceloporus graciosus had highest with proportional values first older breeders about same. proportion expended on slightly lower Uta stansburiana, exhibiting same effort. Scelop- orus jarrovi lowest but showed an increasing age. These data suggest that environment may not be primary selec- tive pressure determining posi- tively correlated age all