Reproduction, Growth, and Development in High-Latitude and Low-Latitude Populations of Peromyscus leucopus (Rodentia)

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Abstract
Reproduction, growth, and development of the white-footed mouse, Peromyscus leucopus, were investigated in laboratory and field populations from southeastern Michigan and from the state of Campeche, México. Laboratory studies revealed that mice from the Campeche population were more precocious in ontogenetic, including sexual, development. In contrast to mice from Michigan, those in Campeche populations had more young per litter, the average interval between litters was shorter, the extent of delayed implantation was not correlated with the number of young being nursed, total weight of the litter in relation to the female's weight was higher, offspring from large litters developed as rapidly as those from small litters, fecundity continued to increase beyond the fourth litter, and neonate weight did not vary with litter size.

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