1. Reproductive frequency
For 1980-2000, we estimated that oviparous mothers laid at least 1
clutch of eggs within most regions with latitudes below 40
oN, while they laid more clutches at lower latitudes
and elevations, with a maximum clutch number of 9 (Fig. 3a). Viviparous
mothers can reproduce (1 litter of embryos) across a larger range of
latitudes (from tropical areas to as far as 50 oN) and
elevations than oviparous mothers (Fig. 3c). Under climate warming
(2080-2100 versus 1980-2000), our model predicts that oviparous mothers
will be able to produce clutches at higher latitudes (up to 54
oN) and elevations (up to Mexican plateau) and more
frequently in most regions (by 1.2 on average), with a larger increment
at higher latitudes, where clutch numbers were relatively low in the
past (Fig. 3b). Viviparous mothers will be able to produce a litter of
offspring at higher latitudes (beyond 50 oN) and
elevations (high elevations at Mexican plateau) (Fig. 3d).