Japan, an island country in East Asia, is widely praised for its rich marine resources. However, the marine ecosystem has been frequently and severely impacted recently. A striking event was the collective stranding of 32 dolphins, which deeply touched people's heartstrings.
Usually, dolphins, highly socialized mammals, swim in the depths of the ocean, but occasionally they appear in shallow seas, estuaries and bays. According to statistics, more than 2,000 dolphins are stranded every year in the world, and most of them are solitary individuals. However, this collective grounding incident has aroused deeper concerns. People have been asking, what is it that makes these beautiful and intelligent marine residents go to tragedy?
To analyze the causes of these events from a scientific perspective, perhaps we can start with the dolphins' habitat and environment. Ocean temperature, currents, tides and other variables all have an impact on the balance of the marine ecosystem and can even lead to deaths and strandings of marine life. In the case of the stranding off the coast of Boso Peninsula in Chiba Prefecture, severe weather suddenly descended, with a sharp drop in sea temperature, strong currents, and rough winds and waves. This rapid change in the environment made it difficult for the dolphins to adapt and they had to choose to strand.
However, there is no single reason for this. Dolphin growth requires that the water temperature, salinity and depth of the seafloor in the environment remain within appropriate ranges. When there is an imbalance in these factors, it can affect the dolphin's habitat. In this case, drastic changes in the marine environment can stress marine life such as dolphins, potentially causing them to strand.
Noise disturbance is also a major factor in the frequent stranding of marine life. Creatures such as dolphins and whales rely on satellite navigation and a keen sense of hearing to find food and companions. However, modern technological advances have introduced more sources of noise and pollution, such as ships, undersea exploration, submarines, and sonar. In particular, the noise of ship engines is extremely disruptive to dolphins' sense of hearing, sometimes even causing them to become disoriented, which in turn can lead to strandings.