Abstract

GOMEZ, María D.; PROVENSAL, María C.  and  POLOP, Jaime J.. Survival and reproductive potential of different cohorts of Calomys venustus. Mastozool. neotrop. [online]. 2007, vol.14, n.1, pp.29-36. ISSN 0327-9383.

In order to determine winter survival and reproductive potential in cohort 2 (C2) and cohort 3 (C3) of Calomys venustus we compared these parameters between individuals of these cohorts and their offspring. Forty six males (13 C2 and 33 C3) and 29 females (21 C2 and 8 C3) were observed from June to September to determine winter survival. There were no significant differences in male and female survival between cohorts. Twenty three male-female pairs of C2 and 14 of C3 were placed in different shelters from October to January to determine the reproductive potential, which was measured as litter size, number of litters, post-partum pregnacies utilization, offspring survival and growth at weaning. There were not any significant differences in the considered reproductive parameters between the two cohorts, except for post-partum pregnancies. C2 and C3 individuals as overwintering cohort would not contribute differently to cohort 1 abundance.

Keywords : Cohort 2; Cohort 3; Litter; Post-partum estrus; Survival.

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