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首页> 外文期刊>Polar biology >Population dynamics of tundra voles in relation to configuration of willow thickets in southern arctic tundra
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Population dynamics of tundra voles in relation to configuration of willow thickets in southern arctic tundra

机译：苔原田鼠种群动态与南极苔原柳柳灌丛形态的关系

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The areal extent and configuration of thickets of willow shrubs are currently changing in the Arctic both as an effect of global warming and changed browsing pressure of reindeer. These changes have been predicted to impact the distribution and abundance of wildlife species relying on willow thickets as habitat. We assessed the relation between variables quantifying willow thicket configuration and population dynamics of tundra voles (Microtus oecono-mus) in three riparian regions in Finnmark, northern Norway, which were subject to intense browsing by semi-domesticated reindeer. The tundra vole, which exhibits 5-year population cycles in Finnmark, is the dominant small rodent species in riparian landscape elements in southern arctic tundra. In the course of a 4-year trapping study, tundra vole populations went through the cyclic phases of increase, peak and crash, however, with distinct differences between the three regions in the population dynamics. Within regions, the occupancy pattern during the increase phase was positively related to willow thicket configuration (in particular edge density and willow height) only in the region attaining the highest abundance and occupancy. However, local abundance was not clearly related to habitat features within any regions. The lack of consistency in the response of tundra vole populations to willow thicket configuration, as well as the positive relation between the degree of thicket shredding and tundra vole habitat occupancy in one of the regions, indicates that tundra voles will not be much affected by climate or browsing induced changes in the shrubbiness of the tundra in the future.
机译：由于全球变暖和驯鹿浏览压力的变化，目前北极灌木丛的灌木丛的面积和构造正在发生变化。预计这些变化会影响以柳灌木丛为生境的野生生物物种的分布和丰富度。我们评估了量化量化柳树灌丛形态的变量与苔藓田鼠（Microtus oecono-mus）在挪威北部芬马克的三个河岸地区的种群动态之间的关系，这些地区受到半驯鹿的强烈浏览。苔原田鼠在芬马克郡拥有5年的种群周期，是南部北极苔原河岸景观元素中占主导地位的小型啮齿动物。在为期4年的诱捕研究过程中，苔原田鼠种群经历了增加，高峰和崩溃的循环阶段，但是这三个区域在种群动态方面存在明显差异。在区域内，仅在达到最高丰度和占有率的区域内，增长阶段的占用模式与柳树灌丛形态（特别是边缘密度和柳树高度）呈正相关。但是，本地丰度与任何区域内的栖息地特征都没有明显关系。苔原田鼠种群对柳树灌木丛构造的响应缺乏一致性，以及其中一个地区的灌木丛切碎程度与苔原田鼠栖息地占用之间存在正相关关系，这表明苔原田鼠不会受到气候的很大影响或浏览会导致苔原灌木丛的变化。

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