What factor is believed to cause inconsistent participation in diel vertical migration among viperfish?
Answer
Slow metabolic rate
Viperfish possess a very low basal metabolic rate, which allows them to conserve energy for long periods between meals. Because they do not require daily nourishment, not all individuals need to ascend toward shallower, more productive waters every night to feed. This biological necessity—or lack thereof—is the primary reason scientists attribute to the incomplete participation in the daily vertical migration cycle observed in the population.
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