硒胁迫下普氏原羚的采食对策
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中国博士后科学基金资助项目(20060400501)


Forage strategy of the Przewalski′s gazelle (Procapra przewalskii) under selenium stress
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    摘要:

    通过对青海湖湖东地区土壤和牧草矿物质元素含量的分析,发现该区严重缺硒。然而,生存于湖东地区的普氏原羚却不见缺硒表症,普氏原羚在长期的进化过程中适应了缺硒环境。提出假说:普氏原羚应对硒胁迫的主要对策是选择采食高硒植物, 在湖东地区,牧草硒含量是影响普氏原羚选择食物的主要因素。得出结论:在湖东地区,芨芨草是普氏原羚的基本食物,同时是主要的高硒植物。普氏原羚应对硒胁迫的主要对策是选择芨芨草草地作为采食地,增加高硒植物芨芨草在食物中的比例。也不是嗜食或喜食高硒植物。

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    We sampled soil and forage samples from the Hudong area of the Qinghai Lake watershed, China and determined the mineral element contents in the samples. We found that concentrations of selenium in soil and forage samples were significantly lower than normal levels. Thus, there is a plausible severe selenium deficiency in the life forms in the Hudong area of the Qinghai Lake watershed, China. However, we did not discover any clinical sign of selenium deficiency in the critically endangered Przewalski′s gazelle which is living in the area. Presumably, the gazelles have adapted to circumstances of the selenium deficiency. How do the gazelles cope with selenium deficiency? We hypothesized that the selenium content of the forage may differ among forage plant species, which is a major factor affecting the foraging strategy of the Przewalski′s gazelle in the Hudong area of the Qinghai Lake watershed; the Przewalski′s gazelle selects forage with rich selenium as food to cope with the selenium stress. We further sampled and analyzed contents of minerals in soils and forage species from the Hudong area of the Qinghai Lake watershed during the summer grazing seasons of 2006 and 2007. We also reanalyzed the previous results about diet study of Przewalski′s gazelle. We reached following conclusions: shining speargrass (Splendid achnatherum) is a plant with rich selenium and major forage of the Przewalski′s gazelle in the Hudong area of the Qinghai Lake watershed, China. To balance the selenium content in diet, the Przewalski′s gazelle selects grazed on shining speargrass steppe. But, shining speargrass is not a preferred and favored plant for Przewalski′s gazelle.

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申小云.硒胁迫下普氏原羚的采食对策.生态学报,2009,29(6):2775~2781

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  • 收稿日期:2008-07-07
  • 最后修改日期:2009-02-26
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