Geomagnetic Position Fixing

非技术性总结 菲利普斯，约翰IBN-9507826 菲利普斯博士的研究将调查 地球磁场来确定地理位置。先前 对迁徙/归巢倾向的研究提供了证据， 一种特殊的磁感应机制 在归航的“地图”部分，以及小的影响， 迁移/归巢时的磁倾角或强度变化 导向 基于地图的归航研究（即，真正的导航） 将在受控的实验室条件下进行， 对操作的各个参数的响应 可以研究磁场。 两种定向形式 将研究涉及地球磁场的问题，即， 磁罗盘定向（只需要罗盘信息） 和长距离寻的或真正的导航（需要地图 和罗盘信息）。 这将使得可以 区分实验操作对地图的影响，或 地理位置感来自罗盘的影响。 在 此外，开发了双坐标导航的图形模型 这项工作将被用来估计局部梯度 动物家附近的磁场参数 从他们对实验性操纵的行为反应来看， 这些参数。 这些估计可以与 未来测量值的地理变化的磁场 领域 菲利普斯博士的研究将提供有关 生物系统对弱磁场的敏感性， 将有助于目前关于可能影响的辩论 人工电磁场源（电力线，电器， 等等）。对人类健康的影响。

NON-TECHNICAL SUMMARY Phillips, John IBN-9507826 Dr. Phillips' research will investigate the use of the earth's magnetic field to determine geographic position. Previous studies of migratory/homing orientation have provided evidence for the involvement of a specialized magnetoreception mechanism in the "map" component of homing, and for effects of small changes in magnetic inclination or intensity on migratory/homing orientation. Studies of map-based homing (i.e., true navigation) will be carried out under controlled laboratory conditions where the response to manipulation of individual parameters of the magnetic field can be investigated. Two forms of orientation that involve the earth's magnetic field will be studied, i.e., magnetic compass orientation (requiring only compass information) and long-distance homing or true navigation (requiring both map and compass information). This will make it possible to distinguish effects of experimental manipulations on the map or geographic-position sense from effects on the compass. In addition, a graphical model of bicoordinate navigation developed for this work will be used to estimate the local gradients of magnetic field parameters in the vicinity of the animal's home from their behavioral responses to experimental manipulation of these parameters. These estimates can then be compared with future measured values of geographic variation in the magnetic field. Dr. Phillips' research will provide information about the sensitivity of biological systems to weak magnetic fields which will contribute to the current debate concerning possible effects of artificial sources of EMF (power lines, electrical appliances, etc.) on human health.