Trails in Open Waters: Sensory Cues in Salmon Migration

摘要: Salmon display layer-dependent swimming patterns in open waters. Analysis of the behavior shows that they move within certain microstructure layers water. However, anosmic salmon do not demonstrate this behavior, either fresh-or saltwater. One explanation for such layer preferences is detect characteristic odorants from home river are localized a particular layer. The olfactory system necessary stream detection, and also very sensitive to emanate conspecific fishes. These features combined suggest an important role possible involvement kin recognition homing behavior. A change magnetic field surrounding free-swimming does influence sensory intact animals. recent studies have shown particularly low-frequency stimuli range 0.1 l0Hz (i.e., infrasound). This fact implies may linear acceleration which it exposed when moving one adjacent one. Based on knowledge, following scenario proposed orientation: In waters swim with small-scale oscillations smell neighboring layers, thereby gain information about chemical differences between layers. further relative movements by means their auditory system. Thus, can sense heading orient countercurrent direction If contains odors stream, rheotactic will eventually lead fish sources attractive signals.