The Sichuan Hill Partridge （Arborophila rufipectus ） requires successional broadleaf forest and their populations have declined as a result of fragmentation of endemic bird areas in subtropical forest in the mountai...The Sichuan Hill Partridge （Arborophila rufipectus ） requires successional broadleaf forest and their populations have declined as a result of fragmentation of endemic bird areas in subtropical forest in the mountains of southwestern China. In this paper, habitat utilization of the Sichuan Hill Partridge was studied in replanted broadleaf forests, in Laojunshan Nature Reserve of Sichuan, to determine the importance of habitat features, during the non-breeding period from November to December 2005. The Sichuan Hill Partridge utilized habitats within elevations of 1 000 to 1 600 m and with a south-facing slope of two to 15 degrees, close to road and forest edges. The birds preferred sites with smaller bamboo density, lower bamboo cover and snow cover and shrub cover was greater at used sites than at random sites. Principal components analysis indicated that food on the ground layer, topographic condition, concealment and temperature were the first four components of bird habitat selection, and the load of the first component was 29.407%. The findings indicated that the Sichuan Hill Partridge might face the well-documented trade-off between food resource and predation risk when utilizing habitat. We suggest that the conservation and restoration of successional broadleaf forest habitats will benefit the Sichuan Hill Partridge.展开更多
卵母细胞所特有的转录调节因子在卵子发生、卵泡形成和胚胎发育的早期等多个阶段中具有重要作用。文章综述了在雌性生殖系中特异性表达的转录调节因子缺失生殖系α因子基因(factor in the germline alpha,FIGLA)和新生儿卵巢同源盒基因(...卵母细胞所特有的转录调节因子在卵子发生、卵泡形成和胚胎发育的早期等多个阶段中具有重要作用。文章综述了在雌性生殖系中特异性表达的转录调节因子缺失生殖系α因子基因(factor in the germline alpha,FIGLA)和新生儿卵巢同源盒基因(newborn ovary homeobox Gene,NOBOX)在卵子发生过程中的研究进展,旨在为哺乳动物的生殖调控提供一定参考。展开更多
旨在探讨生殖细胞核因子(nuclear receptor subfamily 6 group A member 1,NR6A1)和椎体发育同源物(vertebrae development homolog, VRTN)基因的多态性对苏姜猪体重、体长、体高、胸围、胸宽、臀宽和背膘厚7个生产性状的影响。试验利用...旨在探讨生殖细胞核因子(nuclear receptor subfamily 6 group A member 1,NR6A1)和椎体发育同源物(vertebrae development homolog, VRTN)基因的多态性对苏姜猪体重、体长、体高、胸围、胸宽、臀宽和背膘厚7个生产性状的影响。试验利用PCR扩增和酶切片段多态性技术检测苏姜猪及其亲本猪品种中NR6A1和VRTN基因的多态性,并将NR6A1和VRTN基因的多态性与苏姜猪的生产性状进行关联性分析。遗传多态性分析结果表明,NR6A1基因p.Pro192Leu (g.299084751 C>T)位点在姜曲海猪、枫泾猪和杜洛克猪群体中已经纯合,分别为CC、CC和TT基因型;在苏姜猪群体中有TT、TC和CC 3种基因型,基因型频率分别为0.397、0.482和0.121,基因型分布频率符合哈迪温伯格平衡(Hardy-Weinberg equilibrium, HWE,P>0.05),处于中度多态(0.250.05),VRTN基因对苏姜猪胸围、胸宽和臀宽均有显著影响(P<0.05),对其他性状无显著影响(P>0.05)。合并基因型对苏姜猪体长、胸围和背膘厚均有显著影响(P<0.05),对其他性状无显著影响(P>0.05)。综上可知,NR6A1和VRTN基因对苏姜猪的生产性状具有一定影响,为后续应用NR6A1和VRTN基因辅助选育苏姜猪提供参考。展开更多
the investigation was carried out on 10-year-old plantation of Fraxinus mandshurica in Mao抏r Mountain Experimental Station of Northeast Forest University. Tree height (H), diameter at breast height (D1.3) and the inc...the investigation was carried out on 10-year-old plantation of Fraxinus mandshurica in Mao抏r Mountain Experimental Station of Northeast Forest University. Tree height (H), diameter at breast height (D1.3) and the increment of tree height in 5 years (H5), the thickness of humus layer, as well as the soil moisture were measured for the plantation and the growth indexes (H, D1.3, H5) for different site conditions were analyzed. The results showed that main site factors influencing the growth of Fraxinus mandshurica were soil moisture, gradient and location of slope in order. The growth of Fraxinus mandshurica was better on the middle- or up-slope site than on the down-slope site. Soil moisture and late frost caused by terrain are the main reasons that limit the growth of Fraxinus mandshurica plantation.展开更多
文摘The Sichuan Hill Partridge （Arborophila rufipectus ） requires successional broadleaf forest and their populations have declined as a result of fragmentation of endemic bird areas in subtropical forest in the mountains of southwestern China. In this paper, habitat utilization of the Sichuan Hill Partridge was studied in replanted broadleaf forests, in Laojunshan Nature Reserve of Sichuan, to determine the importance of habitat features, during the non-breeding period from November to December 2005. The Sichuan Hill Partridge utilized habitats within elevations of 1 000 to 1 600 m and with a south-facing slope of two to 15 degrees, close to road and forest edges. The birds preferred sites with smaller bamboo density, lower bamboo cover and snow cover and shrub cover was greater at used sites than at random sites. Principal components analysis indicated that food on the ground layer, topographic condition, concealment and temperature were the first four components of bird habitat selection, and the load of the first component was 29.407%. The findings indicated that the Sichuan Hill Partridge might face the well-documented trade-off between food resource and predation risk when utilizing habitat. We suggest that the conservation and restoration of successional broadleaf forest habitats will benefit the Sichuan Hill Partridge.
文摘卵母细胞所特有的转录调节因子在卵子发生、卵泡形成和胚胎发育的早期等多个阶段中具有重要作用。文章综述了在雌性生殖系中特异性表达的转录调节因子缺失生殖系α因子基因(factor in the germline alpha,FIGLA)和新生儿卵巢同源盒基因(newborn ovary homeobox Gene,NOBOX)在卵子发生过程中的研究进展,旨在为哺乳动物的生殖调控提供一定参考。
文摘旨在探讨生殖细胞核因子(nuclear receptor subfamily 6 group A member 1,NR6A1)和椎体发育同源物(vertebrae development homolog, VRTN)基因的多态性对苏姜猪体重、体长、体高、胸围、胸宽、臀宽和背膘厚7个生产性状的影响。试验利用PCR扩增和酶切片段多态性技术检测苏姜猪及其亲本猪品种中NR6A1和VRTN基因的多态性,并将NR6A1和VRTN基因的多态性与苏姜猪的生产性状进行关联性分析。遗传多态性分析结果表明,NR6A1基因p.Pro192Leu (g.299084751 C>T)位点在姜曲海猪、枫泾猪和杜洛克猪群体中已经纯合,分别为CC、CC和TT基因型;在苏姜猪群体中有TT、TC和CC 3种基因型,基因型频率分别为0.397、0.482和0.121,基因型分布频率符合哈迪温伯格平衡(Hardy-Weinberg equilibrium, HWE,P>0.05),处于中度多态(0.250.05),VRTN基因对苏姜猪胸围、胸宽和臀宽均有显著影响(P<0.05),对其他性状无显著影响(P>0.05)。合并基因型对苏姜猪体长、胸围和背膘厚均有显著影响(P<0.05),对其他性状无显著影响(P>0.05)。综上可知,NR6A1和VRTN基因对苏姜猪的生产性状具有一定影响,为后续应用NR6A1和VRTN基因辅助选育苏姜猪提供参考。
文摘the investigation was carried out on 10-year-old plantation of Fraxinus mandshurica in Mao抏r Mountain Experimental Station of Northeast Forest University. Tree height (H), diameter at breast height (D1.3) and the increment of tree height in 5 years (H5), the thickness of humus layer, as well as the soil moisture were measured for the plantation and the growth indexes (H, D1.3, H5) for different site conditions were analyzed. The results showed that main site factors influencing the growth of Fraxinus mandshurica were soil moisture, gradient and location of slope in order. The growth of Fraxinus mandshurica was better on the middle- or up-slope site than on the down-slope site. Soil moisture and late frost caused by terrain are the main reasons that limit the growth of Fraxinus mandshurica plantation.
