Incisor microwear of Arctic rodents as a proxy for microhabitat preference
Incisor microwear of Arctic rodents as a proxy for microhabitat preference
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DOI：
10.1007/s42991-021-00138-x
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发表时间：
2021-06
影响因子：
1.6
通讯作者：
P. Ungar;Lindsay Saylor;A. Sokolov;N. Sokolova;O. Gilg;S. Montuire;A. Royer
中科院分区：
文献类型：
--
作者：
P. Ungar;Lindsay Saylor;A. Sokolov;N. Sokolova;O. Gilg;S. Montuire;A. Royer
北极不断变化的环境条件使得记录和了解脆弱的高纬度哺乳动物的栖息地偏好和灵活性变得重要。间接代理对于难以捕捉的物种特别有用，例如啮齿动物。本研究探讨了门齿微磨损的行为和微栖息地的使用在西伯利亚旅鼠（Lemmus sibiricus）和窄头田鼠（Lasiopodomys gregalis）从亚马尔半岛，俄罗斯的变化作为一个指标。59个人进行了采样，沿着纬度梯度从森林苔原交错带高北极苔原在四个网站。旅鼠出现在最北的地方，田鼠出现在最南的地方，两种都出现在中间两个地方。gregalis喜欢干燥的灌木丛和更开放的微生境和地下洞穴。基于数据库的分析表明，更高的密度的功能和更均匀的定向条纹的田鼠比旅鼠在网站与这两个物种。该物种也显着不同的微磨损纹理属性，建议较大的功能，旅鼠，和较小的，但更多的，田鼠。虽然没有纹理的差异，发现物种内的网站之间，从开放的苔原的田鼠有较高的条纹密度比森林苔原交错带。此外，旅鼠从开放的苔原网站有较高的条纹密度比那些从水饱和，苔藓覆盖的最北端的网站。虽然微生境的偏好和洞穴田鼠可能有助于物种之间的差异，变化内似乎反映了栖息地的变化，因为不同地点之间的磨损负荷的差异。这表明，门齿微磨损模式可以用来跟踪北极啮齿动物种群之间的微生境差异。
Changing environmental conditions in the Arctic make it important to document and understand habitat preferences and flexibility of vulnerable high-latitude mammals. Indirect proxies are especially useful for elusive species, such as rodents. This study explores incisor microwear as an indicator of variation in behavior and microhabitat use in Siberian lemmings (Lemmus sibiricus) and narrow-headed voles (Lasiopodomys gregalis) from the Yamal Peninsula, Russia. Fifty-nine individuals were sampled at four sites along a latitudinal gradient from forest-tundra ecotone to high-Arctic tundra. Lemmings are present at the northernmost site, voles at the southernmost site, and both species at the middle two.Lemmus sibiricusprefers wet, mossy lowland, whereasLa. gregalisfavors drier thickets and more open microhabitats and burrows underground. Feature-based analyses indicate higher densities of features and more uniformly oriented striations for voles than lemmings at sites with both species. The species also differ significantly in microwear texture attributes suggesting larger features for lemmings, and smaller ones, but more of them, for voles. While no texture differences were found between sites within species, voles from sites with open tundra have higher striation densities than those from the forest-tundra ecotone. Furthermore, lemmings from open tundra sites have higher striation densities than those from the water-saturated, moss-covered northernmost site. While microhabitat preferences and burrowing by voles likely contribute to differences between species, variation within seems to reflect habitat variation given differences in abrasive loads between sites. This suggests that incisor microwear patterning can be used to track microhabitat differences among Arctic rodent populations.