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EFFECT OF REMOVAL ON AGE STRUCTURE AND REPRODUCTION OF PLATEAU ZOKOR POPULATION IN ALPINE MEADOW

ZHANG Yanming   

  • Online:2006-06-23 Published:2008-07-07

捕杀对高原鼢鼠种群年龄结构及繁殖的影响

张堰铭   

  1. 中国科学院西北高原生物研究所 , 西宁

Abstract: Two populations of plateau zokor one was removed part and another was not in alpine meadow were studied by comparison in Haibei, Qinghai province from May 1995 to October 1996. The natural population density was significantly higher than that of remnant's. 470 zokors were captured from two populations in 1996. There was significant difference in age structure between two population in May(X2=9.97, P<0.05), moreover, strongly significant difference in July and October, respectively (X2=15.134, X2=15.612, P<0. 01). Adu1t I of remnant in May occupied 53.45% was strongly higher than that ofnatural's that occupied 29.694%. However, adult IIofremnant only occupied 34.48% waslower than that of natural's(48.44%) in same period. Age classes of natural population were relatively stable in different season, but remnant's were not. The total of juvenile and subadult in remnant occupied 35.06% was higher than that in natural(22.00%) in July. There was significant difference in age structure between two populations in October. Adult of remnant occupied 51.35% was significantly different with naturals (23.01%). Olders and Oldests only occupied 9.62% was significant lower than that of natural's (23. 08%). The body length and weightin allage classes were notsignificantly different. But the body weight of male showed significantly positive correlation with age class.The female pregnancy rate of adult I of remnant population was higher than that of natural's, the litter size of remnant population was 3.32,that of natural's was2.85.The significant difference was not found.

Key words: Plateau zokor(Myospalax baileyi):Age structure, Reproduction

摘要: 捕杀高原鼢鼠后, 残鼠种群与自然种群年龄结构相比较, 5月差异性显著(X2=9.97,P<0.05); 7月和10月差异极显著(X2 =15.134,X2=15.612, P<0.01)。5月, 残鼠种群成年Ⅰ组占最大比例 (53.45%); 自然种群成年Ⅱ组占最大比例(48.44%)。7月,残鼠种群幼年组和亚成年组所占比例之和 (35.06%) 明显高于自然种群 (22.00%)( P <0.05)。10月, 残鼠种群近老年组和老年组所占比例之和 (9.62%) 明显低于自然种群(23.08%)(P < 0.05)。残鼠种群成年Ⅰ组雌鼠怀孕率 (84.62%) 明显高于自然种群(58.33%) (P<0.05); 平均胎仔数 (3.32) 也高于自然种群 (2.85), 但差异不显著 (P>0.05)。

关键词: 高原鼢鼠, 年龄结构, 繁殖