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• W2347924172 abstract "Small mammals are of crucial importance to boreal forest ecosystem because they constitute staple food for many mammalian and avian predators and they consume plants, lichens, fungi and invertebrates. In addition, they also help plants to disperse their seeds. However, small mammals have also been shown to be more susceptible to local extinction in fragmentated habitats. The composition of small mammals in many vegetation types in Northeast Forest Regions of China is incompletely known. We also do not know what effect habitat changes caused by logging and cultivationg have on small mammal communities. We investigated the species distribution and abundance of small mammals and used them as indicators for monitoring environmental changes, and to explore how these changes would affect spatial distribution patterns and local biodiversity in a more general sense. The study was conducted in Fenglin Nature Reserve and its surrounding regions (E128°59′~129°15′,N48°01′~48°09′), which is located in the middle of Xiao Xing'an Ling forest region, in northeast China. Small mammals were trapped using snap traps and pitfalls trapping from July to August 2000 at seven sites along different habitat gradients. Two grids were established at each site, with ≥100 m between the two grids. Each grid consisted of 50 snap traps and 20 pitfalls. Snap traps were set in two parallel lines 20 m apart with 25 snap traps (5 m apart) along each line. The 20 pitfalls (5 m apart) were set between the two parallel lines of snap traps. Trapping was carried out for 4 consecutive days at each site. In total, 326 individuals were captured, comprising 1 species of shrew and 8 species of rodents. Of these, Clethrionomys rufocanus (49%) was the most commonly trapped species in this region. Apodemus agrarius, A.speciosus, C. rutilus each accounted for 10%~12% of total individuals. Rattus norvegicus only accounted for 2.1% of total individuals and was the rarest species. The captured species were not evenly distributed along the habitat gradients. Analyses of diversity of small mammals in different habitats showed that species richness and diversity index ( H ′) were highest in shrub habitats, where human disturbance has been moderate in recent years. They were also high in two secondary forests and farmland. Species richness in primary forest 1 and primary forest 2 , where were not disturbed, were the lowest, and the diversity index ( H ′) was lowest in primary forest 3, which has been disturbed lightly by human. Evenness was highest in farmland, although the human disturbance is most serious there. Evenness in the secondary forest 1 and shrub habitats ranked next, and evenness was lowest in primary forest 3 and secondary forest 2, where were seriously disturbed by mowing. Analysis of correlationof species diversity index ( H ′) and tree canopy density/vegetation coverage demonstrated a significant positive correlationof species diversity index ( H ′) with vegetation coverage but not with tree canopy density. Based on similarity indices, seven habitats can be clustered at the level of 0.0631 with systematic clustering. When a threshold of 0.6 for the similarity index was considered, the seven habitats could be categorized into three groups: (1)primary forests habitats, (2) secondary forest habitats, and (3) shrub and farmland. We conclude that, in Xiao Xing'an Ling forest region, in northeast China, the distribution and abundance of small mammals are influenced to a great extent by structural habitat factors such as stage of vegetation succession, food, and ground cover. In addition, human activity is one of the main factors affecting species diversity of small mammals in the region." @default.
• W2347924172 created "2016-06-24" @default.
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• W2347924172 date "2003-01-01" @default.
• W2347924172 modified "2023-09-25" @default.
• W2347924172 title "Studies on bio-diversity of small mammals along different habitat gradients in the Xiao Xing'an Ling Forest Region, China" @default.
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