摘要:

摘要: 采用最近邻体法、Ｔ形取样法和负二项分布法对内蒙古达茂联合旗腾格淖尔地区的大沙鼠和子午沙鼠空间分布格局进行了研究。结果表明，大沙鼠一年四季均为聚集分布，子午沙鼠在冬春季为均匀分布，在夏秋季为聚集分布。二种群间在冬春季为聚集或均匀分布，在夏秋季为明显的聚集分布。对二者空间分布格局进行相关性检验，冬春季二者为负相关，夏秋季为正相关。

摘要: 大沙鼠洞群空间分布格局的研究ＳＴＵＤＹＯＮＳＰＡＴＩＡＬＰＡＴＴＥＲＮＳＯＦＨＯＬＥＧＲＯＵＰＳＯＦＲＨＯＭＢＯＭＹＳＯＰＩＭＵＳ大沙鼠（Ｒｈｏｍｂｏｍｙｓｏｐｉｍｕｓ）是亚洲中部荒漠以及荒漠草原的典型栖居者。中亚国家和蒙古国的学者在第二次世界大战...

摘要: 本文对８例长爪沙鼠（Ｍｅｒｉｏｎｅｓｕｎｇｕｉｃｕｌａｔｕｓ）幼年、亚成年、成年和老年雄性个体的阴茎头组织进行连续切片。结果表明，阴茎头的外环层和阴茎骨近支由阴茎海绵体衍生而来；内环层、尿道小瓣、阴茎骨远支和侧支由尿道海绵体衍生而成。采用扫描电镜观察了长爪沙鼠、子午沙鼠（Ｍ．ｍｅｒｉｄｉａｎｕｓ）、大沙鼠（Ｒｈｏｍｂｏｍｙｓｏｐｉｍｕｓ）和甘肃绒鼠（Ｅｏｔｈｅｎｏｍｙｓｅｖａ）、黑腹绒鼠（Ｅ．ｍｅｌａｎｏｇａｓｔｅｒ）共５种１６例的阴茎头表皮棘，发现其形态、数量和分布有属、种间差异性和相对稳定性，沙鼠属（Ｍｅｒｉｏｎｅｓ）３种的表皮棘均呈牛角状的圆锥体，斜向排列成行；而绒鼠属（Ｅｏｔｈｅｎｏｍｙｓ）内甘肃绒鼠为球状表皮棘，黑腹绒鼠为牛角状，排列均不规则。因此，阴茎头表皮棘与阴茎骨、阴茎头软体结构均有分类学意义。

摘要: Based on population surveys of great gerbil(Rhombomys opimus)by blocking up the mouseholes and inspecting the opened ones conducted in three different habitats in Tengenor,Damaolianheqi,Baotou City of Inner Mongolia in February,April,June,August,October and December from 2003 to 2005,relationship between density of the great gerbil and rainfall was analyzed.Results showed that population densities of the great gerbil vary with seasons and years,and its density curves have a single peak value every year.A regression equation Y8=-8.7202 + 0.8806X(df=16,r=0.5394>r0.05=0.468)resulted from analyzing the relationship of the density to the rainfall the previous month indicates that the population size of the great gerbil was positively related to the previous month's rainfall.The density occurring in August and October can be predicted by that in April.The forecasting models for the density in August and October are Y8=-1.0925+2.6133X4(df=6,r=0.9776>r0.01=0.834)and Y10=-0.2097+2.4992X4(df=6,r=0.9672>r0.01=0.834)respectively.