BIEB 166 Lecture Notes - Lecture 16: Centrocercus, Swim Bladder, Frequency Multiplier
8 Nov 2013
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To make a sound, an animal must produce a vibration, modify it to make it biologically useful, and then successfully couple it to the medium. This is difficult enough to do that only arthropods and vertebrates use sounds for communication. Sac usually filled with gas (nitrogen), and muscles around the sac contracts/relax to adjust the density inside the sac (contracts, higher pressure, higher density, sinks) Rapidly contact and expand the muscles around the swim bladder to produce sound. The fish is in neutral density of the environment around it. Something moves back and forth along an axis. Moving front legs between two poles back and forth. If the male is larger in size, it would create ripples of larger size. If the vibrator is small relative to the wavelengths begin produced, then the sound produced is easily short-circuited. The waves will propagate from one side of the moving surface to the opposite side and thus not radiate any sound outwards.
