Question

part 2: mesopelagic (twilight zone)

1. how much sunlight reaches this zone? what is the purpose of the bioluminescence of many animals found in this zone?
2. describe the process of the \daily vertical migration.\ why do animals do this?
3. name two organisms that live in the twilight zone.

Explanation:

1. Only about 1 - 5% of sunlight reaches the mesopelagic (Twilight Zone). Bioluminescence in animals here is used for communication, camouflage, attracting prey, and avoiding predators.
2. Daily vertical migration involves animals moving up to the surface - waters at night to feed (where food is more abundant) and descending to the Twilight Zone during the day to avoid predators.
3. Examples of organisms in the Twilight Zone include lanternfish and hatchetfish.

Answer:

1. Only about 1 - 5% of sunlight reaches this zone. The purpose of bioluminescence in many animals is for communication, camouflage, attracting prey, and avoiding predators.
2. The process of "daily vertical migration" is when animals move up to the surface - waters at night to feed (as there is more food available near the surface at night) and move back down to the Twilight Zone during the day to avoid visual - hunting predators.
3. Two organisms that live in the Twilight Zone are lanternfish and hatchetfish.