Performance of Airborne Animal Sonar Systems: I. Microchiroptera
Animals living in the dark are faced with the problem that vision is only of limited use for orientation in the environment and for the detection and identification of relevant targets. In order to cope with this situation, some animals, during evolution, developed eyes which were especially adapted for good visual efficiency at low light intensities whereas others improved the remaining sensory systems.
As a result of the first study on secondary metabolites from the cosmopolitan bioluminescent marine tube polychaete Chaetopterus variopedatus, a new bicyclic guanidine alkaloid, 6-epi-monanchorin (1), along with the previously known monanchorin (2) were isolated. The structure of 1 was elucidated by...