Question

Почему ланцетники активны ночью? Срочно!!

Answer 1

Ответ:

Одна из причин это откладывание икринок самки ланцетника(так как более безопасное время).

Answer 2

Why are lancelets active at night?

Lancelets, also known as amphioxus, are small marine animals that belong to the phylum Chordata. They are known for their ability to burrow in the sand and are typically found in shallow coastal waters. Lancelets are active at night for several reasons:

1. Feeding Strategy: Lancelets are filter feeders, meaning they obtain their food by filtering small particles from the water. They use a specialized structure called the pharyngeal slits to filter out food particles. Lancelets are more active at night because it is when the concentration of plankton, their primary food source, is typically higher in the water column.

2. Predator Avoidance: Lancelets are small and relatively defenseless animals. Being active at night provides them with some protection from predators. Many of their predators, such as fish and birds, are diurnal (active during the day) and are less likely to encounter lancelets during the night.

3. Environmental Factors: Lancelets are sensitive to environmental factors such as temperature, light, and water currents. They are more active at night when the water temperature is cooler and the light intensity is lower. This allows them to avoid potential stressors and optimize their feeding and reproductive activities.

It is important to note that while the information provided above is based on general knowledge about lancelets, specific research studies may provide more detailed insights into their nocturnal behavior.