贺兰山岩羊(Pseudois nayaur)集群特征的季节变化
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国家自然科学基金资助项目(30470231、30670309);中国博士后科学基金资助项目(2005037496);国家新世纪优秀人才支持计划(NCET-08-0753);国家科技支撑资助项目(2008BADB0B04);宁夏回族自治区林业局自选课题资助项目(2004-01)


Seasonal variations in group types and sizes of blue sheep (Pseudois nayaur) in the Helan Mountains, China
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    摘要:

    2004年11月~2005年10月,在贺兰山对岩羊(Pseudois nayaur)的集群行为进行了研究,将其集群类型划分为雌性群、雄性群、雌雄群、母仔群、混合群和独羊6种类型。共观察到岩羊1 023群次,计4 866只次,平均群大小为(4.86±2.54)只,最大的群为51只,最小的为独羊。其中,母仔群459群(44.87%)为最多的集群类型,其余为混合群(20.72%)、雄性群(14.86%)、独羊(9.09%)、雌雄群(5.57%)、雌性群(4.89%)。母仔群出现的频次在4个季节均最高,除母仔群外,春季雄性群出现的频次最高,而夏、秋、冬季都是混合群出现的频次最高,不同类型集群出现频次的季节间差异极显著。在4个季节中都以2~5只的群居多,其出现的频次占各季节群数50%以上,不同季节群大小差异极显著,而不同集群类型群大小季节间不存在显著差异。除独羊外,不同季节混合群大小差异极显著,母仔群、雌性群大小差异显著,而雄性群、雌雄群大小无显著差异。研究结果显示,贺兰山岩羊集小群是其显著特点,随着季节的变化,其集群类型、集群大小均会发生一定的变化。

    Abstract:

    We studied group types and sizes of blue sheep (Pseudois nayaur) in the Helan Mountains from November 2004 to October 2005. Blue sheep groups were observed with KOWA 8×42 DCF binoculars and a KOWA TSN-824 M power spotting scope. Groups were classified as female, male, male-female, ewe-lamb, mixed groups, and solitary sheep. A total of 4 866 sheep belonging to 1 023 groups were observed, with a mean group size of 4.86 (SD=2.54). The largest groups included 51 sheep and the smallest groups were solitary sheep. Ewe-lamb groups were the most frequently encountered, constituting 44.8% of total observations. Mixed-sex groups, male groups and solitary sheep made up 20.72%, 14.68%, and 9.09% respectively of total observations. Male-female and female groups made up 5.57% and 4.89% of total sheep classified. Ewe-lamb groups predominated in all seasons, but frequencies of observed group types varied seasonally (P<0001). Male groups were more numerous in spring than in other seasons, whereas mixed groups were least in spring, increasing through summer, autumn, and winter. Groups consisting of 2-5 individuals dominated in all seasons, and constituted 50% of total groups observed. Group sizes varied seasonally (P<0.001), but mean group size did not differ seasonally. There were significant seasonal variations in group sizes of mixed-sex (P<0.001), ewe-lamb (P<0.05), and female groups (P<0.05). Seasonal variations in sizes of male and male-female groups were not significant. Small herd sizes are characteristic of the blue sheep in the Helan Mountains.

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刘振生,李新庆,王小明*,李志刚,胡天华,翟昊.贺兰山岩羊(Pseudois nayaur)集群特征的季节变化.生态学报,2009,29(6):2782~2788

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