Mechanisms of homing in the fiddler crab Uca rapax 1.: Spatial and temporal characteristics of a system of small-scale navigation
Mechanisms of homing in the fiddler crab Uca rapax 1.: Spatial and temporal characteristics of a system of small-scale navigation
复制标题
DOI：
10.1242/jeb.00660
复制
发表时间：
2003-12-01
影响因子：
2.8
通讯作者：
Duncan, LMJ
中科院分区：
文献类型：
--
作者：
Layne, JE;Barnes, WJP;Duncan, LMJ
招潮蟹Uca rapax是中心位置的觅食者，从洞穴中进行长达2米的觅食旅行。我们描述了自然的喂养行程的路径整合招潮蟹和分析其路径的迹象显着的系统或随机导航错误。没有任何系统性错误的迹象。随机误差很小，可能是由于觅食路径的短长度和低弯曲度的组合，以及招潮蟹独特的运动方法，使它们能够在整个觅食路径中保持面向洞穴，并尽量减少大的身体转弯。我们进一步研究了它们在觅食过程中的身体方向（横向身体轴或多或少指向家）在多大程度上准确地代表了它们存储的家矢量。通过对快速逃逸序列的研究，我们发现螃蟹在逃逸过程中能够修正其横向体轴与原点的偏离，因此它们存储的原点矢量与它们的瞬时体向无关。对平移位移的反应与以前的作者观察到的相同，即螃蟹返回正确的自我中心方向和距离，好像没有发生位移。覆盖洞穴入口导致螃蟹回到洞穴的正确位置，然后开始搜索。当在觅食的螃蟹和洞穴之间放置障碍物时，螃蟹的身体就像没有障碍物一样准确地朝向洞穴。
Fiddler crabs Uca rapax are central-place foragers, making feeding excursions of up to 2m from their burrows. We describe the natural feeding excursions of path-integrating fiddler crabs and analyze their paths for signs of significant systematic or random navigation errors. No signs of any systematic errors are evident. Random errors are small, probably due to a combination of the short length and low sinuosity of the foraging paths, as well as the fiddler crabs' unique method of locomotion that allows them to remain oriented to their burrows throughout the foraging path and to minimize large body turns. We further examined the extent to which their body orientation during foraging (transverse body axis pointing more or less towards home) accurately represented their stored home vector. By examining sequences of fast escape, we have shown that crabs can correct for deviations of their transverse body axis from home during their escape path. Thus their stored home vector is independent of their moment-to-moment body orientation.Crabs were subjected to passive translational displacements and barrier obstructions. Responses to translational displacements were identical to those observed by previous authors, namely that crabs returned in the correct egocentric direction and distance as though no displacement had occurred. Covering the burrow entrance resulted in crabs returning to the correct position of the burrow, and then beginning to search. When a barrier was placed between foraging crabs and their burrow, crabs oriented their bodies toward the burrow as accurately as with no barrier.