Spiecker Lisa, Curdt Franziska, Bally Andreas, Janzen Nadja, Kraemer Philipp, Leberecht Bo, Kingsford Michael J, Mouritsen Henrik, Winklhofer Michael, Gerlach Gabriele
Institute of Biology and Environmental Science, Carl von Ossietzky University Oldenburg, 26111 Oldenburg, Germany.
ARC Centre of Excellence for Coral Reef Studies and College of Science and Engineering, James Cook University, Townsville, QLD, Australia.
iScience. 2023 May 25;26(6):106950. doi: 10.1016/j.isci.2023.106950. eCollection 2023 Jun 16.
Millions of minute, newly hatched coral reef fish larvae get carried into the open ocean by highly complex and variable currents. To survive, they must return to a suitable reef habitat within a species-specific time. Strikingly, previous studies have demonstrated that return to home reefs is much more frequent than would be expected by chance. It has been shown that magnetic and sun compass orientation can help cardinalfish maintain their innate swimming direction but do they also have a navigational map to cope with unexpected displacements? If displaced settling-stage cardinalfish use positional information during their pelagic dispersal, we would expect them to re-orient toward their home reef. However, after physical displacement by 180 km, the fish showed a swimming direction indistinguishable from original directions near the capture site. This suggests that the tested fish rely on innate or learned compass directions and show no evidence for map-based navigation.
数以百万计刚孵化出的微小珊瑚礁鱼类幼体被高度复杂且多变的洋流带入公海。为了生存，它们必须在特定物种的时间内返回合适的珊瑚礁栖息地。引人注目的是，先前的研究表明返回原生珊瑚礁的频率比随机预期的要高得多。研究表明，磁性罗盘和太阳罗盘定向可以帮助天竺鲷保持其固有的游泳方向，但它们是否也有一张导航地图来应对意外位移呢？如果处于定居阶段的天竺鲷在其远洋扩散过程中利用位置信息，我们会预期它们会重新朝着原生珊瑚礁定向。然而，在被物理位移180公里后，这些鱼显示出的游泳方向与捕获地点附近的原始方向没有区别。这表明受试鱼类依赖于先天的或后天习得的罗盘方向，并且没有基于地图导航的证据。
