Bark consumption by voles in relation to mineral contents
Bark consumption by voles in relation to mineral contents
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DOI：
10.1007/bf00994196
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发表时间：
1991-04
影响因子：
2.3
通讯作者：
L. Hansson
中科院分区：
文献类型：
--
作者：
L. Hansson
最近用浸渍木棍进行的田间实验表明，小型啮齿动物明显使用矿物质，尤其是钠，这些发现似乎与田鼠对林业幼苗的损害有关。田鼠（主要或仅田鼠）对实验引入的白杨树枝的树皮和钠浸渍棒的消耗与已砍伐的土地显着相关，但与未处理的废弃田地无关。当夏季连续砍伐废弃田地时，就会出现这种相关性。在田鼠的峰值密度下，实验用钠施肥的松树幼苗的树皮被消耗，但用钙施肥的幼苗或对照幼苗的树皮没有被消耗。被田鼠袭击的松树幼苗的钙、钠和磷含量显着高于最近的未受影响的幼苗。然而，钠和磷含量密切相关。在实验室饲养试验中向田鼠供应钠和钙并没有减少人们对松树皮的兴趣。然而，这种条件被假定为模仿低密度种群树皮采样的情况。钠和可能还有钙的需求被认为是田鼠在其多年种群周期高峰期破坏性树皮消耗的部分决定因素。
Recent field experiments with impregnated wooden sticks have demonstrated a pronounced use by small rodents of mineral supplies, especially sodium, and such findings seemed related to vole damage to forestry seedlings. Consumption of the bark of experimentally introduced aspen twigs and of sodium-impregnated sticks by voles (mainly or onlyMicrotus agrestis) correlated significantly on clear-cuts but not on unmanipulated abandoned fields. Such a correlation appeared when abandoned fields were cut continuously in summer. At vole peak densities, bark of pine seedlings experimentally fertilized with sodium was consumed but not bark of seedlings fertilized with calcium or control seedlings. Field pine seedlings attacked by voles had significantly higher levels of calcium, sodium, and phosphorus than the nearest untouched seedling. However, sodium and phosphorus contents correlated strongly. Sodium and calcium supply to voles in laboratory feeding trials did not diminish the moderate interest in pine bark. Such conditions are, however, assumed to mimic a situation of bark sampling in low-density populations. Sodium, and possibly also calcium, requirements are concluded to be partial determinants of the destructive bark consumption by voles at the peaks of their multiannual population cycles.