Abstract
Pregnancy success in wild Norwegian lemming, Lemmus lemmus, and root voles, Microtus oeconomus, was monitored by recording the occurrence and condition of copulatory plugs, embryos, and mammae in ear-tagged females, which were recaptured several times throughout the summer of 1981 at Finse, Norway. Both populations increased and peaked in density during this period and evidence of pregnancy failure was found in several young, nulliparous females of both species. Similar observations have been reported in several other microtine species and the results are discussed in relation to (i) infertility of immature females, (ii) pregnancy block caused by unfamiliar males, and (iii) other stress related phenomena.
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