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首页> 外文期刊>Oryx >Factors affecting the distribution and abundance of the Endangered volcano rabbit Romerolagus diazi on the Iztaccihuatl volcano, Mexico
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Factors affecting the distribution and abundance of the Endangered volcano rabbit Romerolagus diazi on the Iztaccihuatl volcano, Mexico

机译：影响墨西哥伊兹塔奇瓦特火山上濒临灭绝的火山兔Romerolagus diazi分布和丰度的因素

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The volcano rabbit Romerolagus diazi is an Endangered species endemic to Mexico, with a range of < 400 km(2). We investigated threats from destruction, fragmentation and degradation of habitat, hunting, and cattle grazing intensity in relation to the distribution and abundance of the volcano rabbit on the Iztaccihuatl volcano. Faecal pellet counts were taken as a proxy for rabbit abundance in 1,718 random 0.2 m(2) quadrats at 859 sampling points along 25 transects, covering an area of c. 100 km(2) at altitudes of 3,400-4,000 m. Presence of the species was significantly associated with absence of closed forest, absence of long grass types (not bunchgrass), shallow inclines, absence of cattle grazing, lower altitude, low hunting pressure (measured by proximity to ranger station), absence of bare ground and, contrary to previous findings, increased frequency of fire. The species was significantly more abundant in habitats with a greater percentage cover of zacaton (bunchgrass) and short grass types. It was significantly less abundant in areas with more hunting (measured by proximity to ranger station) and cattle grazing. Key conservation priorities are therefore the protection of the subalpine zacaton bunchgrass-dominated habitat type, strict enforcement of hunting laws and the removal of livestock from relevant national park boundary areas. However, the results suggest that frequent fires have a significant positive effect on the occurrence of the volcano rabbit as a result of habitat improvement and this is often a consequence of anthropogenic management of land for cattle grazing.
机译：火山兔Romerolagus diazi是墨西哥特有的濒危物种，范围小于400 km（2）。我们调查了伊兹塔奇瓦特火山上的火山兔的分布和丰度与栖息地，狩猎和牲畜放牧强度的破坏，破碎和退化有关的威胁。粪便颗粒计数被用作代表1,718个随机0.2 m（2）四方动物在25个样带上859个采样点的25个样点的兔子丰度的代表。在3,400-4,000 m的高度下为100 km（2）。该物种的存在与缺少密林，没有长草类型（不是束草），浅坡，没有牛放牧，低海拔，低狩猎压力（通过靠近护林站来衡量），没有裸露土地显着相关。与以前的发现相反，增加了开火的频率。该物种在栖息地中的丰富度更高，具有较高的zacaton（长草）覆盖率和短草类型。在狩猎（通过护林站附近进行测量）和放牧的牛群较多的地区，这种动物的数量明显不足。因此，关键的保护重点是保护亚高山白草丛生草为主的栖息地类型，严格执行狩猎法以及从相关国家公园边界地区清除牲畜。但是，结果表明，频繁的大火对栖息地改善的结果对火山兔的发生产生了显着的积极影响，这通常是人为饲养牛场管理土地的结果。

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