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OALib Journal期刊
ISSN: 2333-9721
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若尔盖湿地畜牧业对两栖类食性的影响
DOI: 10.3724/SP.J.1145.2010.00683, PP. 683-687
Keywords: 若尔盖湿地,两栖类,食性,畜牧业,不均衡影响
Abstract:
比较若尔盖湿地3种两栖类――高原林蛙（ranakukunoris）、岷山蟾蜍（bufominshanica）和倭蛙（naroranapleskei）的食物组成，分析畜牧业对其食性的影响.根据猎物的数量、体积比例和出现频率，蜉金龟科、蚁科、毛蚊科、象甲科昆虫和某些昆虫幼虫是3种两栖类食谱的主要组成部分，其中最重要的蜉金龟以藏牦牛粪为主要食物和寄居场所.3种两栖类猎物的出现频率和数量比例存在显著性差异.高原林蛙主要取食蜉金龟，在其食谱中，蜉金龟比例占据绝对优势（相对重要性指数iri：35.28）；而倭蛙的食性生态位宽度较宽，蜉金龟科（iri：13.41）、蚁科、毛蚊科、昆虫幼虫以及狼蛛科均占有一定比例；岷山蟾蜍最重要的猎物是蚂蚁（iri：85.54），次之是蜉金龟.结果说明：畜牧业对若尔盖湿地的3种两栖类食性存在不同影响，高原林蛙能从畜牧业发展中获得更多的好处；作为取食的泛化者，倭蛙受畜牧业的影响比高原林蛙小；岷山蟾蜍主要取食蚂蚁，受牧场变化影响也较小.图1表5参26
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