A circadian pacemaker in free-living chipmunks: essential for survival?
A circadian pacemaker in free-living chipmunks: essential for survival?
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DOI：
10.1007/s003590050017
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发表时间：
2000-02-01
期刊：
影响因子：
--
通讯作者：
Smith, SA
中科院分区：
文献类型：
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作者：
DeCoursey, PJ;Walker, JK;Smith, SA
从1997年4月下旬至1998年10月，在一个高密度的人口自由生活的东部花栗鼠，Tamias striatus，在一个4公顷的森林网站在阿勒格尼山脉的昼夜节律的重要性进行了评估。包括在放射性领场组的30只金花鼠与视交叉上核靶向病变，24个手术对照，和20个完整的控制。另外17只花栗鼠在实验室研究中被用作病变校准对照，以将昼夜节律性与超视交叉核缺失的程度相关联。生存记录在该领域的日常无线电跟踪和定期诱捕人口普查，除了在冬季冬眠。一个显着较高比例的视交叉上核病变比手术控制花栗鼠或完整的控制被杀死的黄鼠狼捕食在遣返后的第一个80天。一项28小时的连续普查发现，在黑暗的几个小时里，没有任何花栗鼠的表面活动。然而，夜间运动的发作检测内的永久性牙通过无线电遥测数据记录，特别是在视交叉上核病变的动物。对六个花栗鼠洞穴系统的挖掘和绘图有助于解释遥感活动数据。视交叉上核受损动物夜间的躁动可能是捕食者定位猎物的线索。
The importance of circadian timing was evaluated for 18 months from late-April 1997 through October 1998 in a high-density population of free-living eastern chipmunks, Tamias striatus, at a 4-ha forest site in the Allegheny Mountains. Included in the radio-collared field group were 30 chipmunks with suprachiasmatic nucleus-targeted lesions, 24 surgical controls, and 20 intact controls. An additional 17 chipmunks were used in a laboratory study as lesion-calibration controls to correlate degree of circadian arrhythmicity with extent of supra-chiasmatic nucleus deletion. Survival was documented in the field by daily radio tracking and by regular trapping censuses except during winter hibernation. A significantly higher proportion of suprachiasmatic nucleus-lesioned than surgical control chipmunks or intact controls were killed by weasel predation during the first 80 days after repatriation. A 28-h continuous census found no surface activity of any chipmunks during hours of darkness. However, episodes of nocturnal movement were detected within the permanent dens by radio telemetric data logging, especially in supra-chiasmatic nucleus-lesioned animals. Excavation and mapping of six chipmunk burrow systems aided in the interpretation of the telemetric activity data. Nighttime restlessness of supra-chiasmatic nucleus-lesioned animals may have acted as a clue to the predator for locating its prey.