Theory 15/Deep scattering layer/Ratio lens
Amplitude Is Food Against Risk
The claim
Migration amplitude is set by the ratio of surface food to predation risk, so populations in risky water migrate less despite abundant food.
01Mechanism
Animals trade feeding against being seen; the ratio determines how far they come up.
02Prediction
Amplitude should track the ratio.
03Refutation
Amplitude tracking food alone would remove risk.