Resumen

SUAREZ-RODRIGUEZ, Orlando et al. Relative clutch mass in Phrynosoma orbiculare (Squamata: Phrynosomatidae) in the Parque Estatal Sierra Morelos, Toluca, Estado de México. Rev. Mex. Biodiv. [online]. 2018, vol.89, n.1, pp.282-289. ISSN 2007-8706.  https://doi.org/10.22201/ib.20078706e.2018.1.1925.

Clutch size, relative clutch mass and traits of hatchlings are important life history traits. The present study provides information on clutch size, relative clutch mass and traits of hatchlings of a population of Phrynosoma orbiculare occurring in the Parque Estatal Sierra Morelos, Toluca, Estado de México (± 2,700 m asl). Gravid females (n = 14) having SVL of 75.2 ± 2.3 mm produced clutch sizes of 8.3 ± 0.6 hatchlings, and relative clutch masses of 27.2 ± 1.5 g. Females of greater size and weight had higher numbers of live-born offspring, a common situation in lizards of temperate habitats, whereas lighter weight females had higher relative clutch mass than heavier females; both results have been recorded in lizards, including species of Phrynosoma. Neonates had SVL of 26.1 ± 0.1 mm, and weights of 1.1 ± 0.01 g (without sexual difference), we found a very low variation in both traits; the sex ratio was 1:1.

Palabras llave : Reproduction; Clutch size; Life history traits; Sex ratio.

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