Dusky shrews were captured largely in alpine shrub habitats, while pygmy shrews were captured only in lowland forest habitat types. Cinereus shrews were captured in similar numbers in boreal mixedwood forest and alpine shrub habitats, and rarely in other lowland forest habitat types. Shrew capture rates and species richness was low in all habitat types sampled. monticolus 0.14 per 100 TN) and American pygmy shrews (S. cinereus 0.25 per 100 TN) were the most common species, followed by dusky shrews (S. The overall capture rate was 0.47 shrews per 100 trap nights (TN), with a total sampling effort of 3,652 TN. We conducted pitfall trapping in six common xeric habitatĨ types in Yukon, Canada, to determine their relative use by shrews. cinereus are compared with those of the most common Eurasian shrew (Sorex araneus).Ībstract: Few studies have explicitly examined habitat use by shrews (Sorex spp.) in the boreal forest of western North America. The mean percentage volume of lepidopteran larvae in shrew stomach contents was similar between years, months, and sites. Lepidopteran larvae (moth) were the primary food type in stomach contents of immature shrews, followed by coleopterans (beetles) and arachnida (spiders). The summer cohort was produced by both overwintering individu- als and shrews of the fi rst generation in that year. The spring cohort, primarily produced by overwintering shrews, had a higher reproductive value than the summer cohort because they may have reproduced in the year of birth. Two distinctive cohorts were identifi ed. The breeding season was at least six months long (May-October). Breeding began in May or earlier with litter sizes averaging 6.7 ± 0.3 (mean ± SE) embryos per pregnant female. The seasonal pattern of capture was unimo- dal with the peak occurring at the end of the summer. cinereus showed variations between years. In this study, the abundance, reproduction, population structure, and diet of Sorex cinereus (Masked shrew) were analyzed in jack pine plan- tations in the southern boreal forest of eastern Canada over two years. The ecology of shrews is better understood in the boreal forest of Eurasia than in simi- lar regions of North America.
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