Heidi Fox, from Rutgers University in Canada, made a scientific study on the spawning and larval drifting of benthic organisms in the Atlantic Ocean, and found that the warming of the ocean current was causing benthic organisms to distribute in areas unsuitable for survival. Fox said, "They are obviously going in the wrong direction."

Benthic organisms, that is, organisms living at the bottom of the ocean or inland waters, are key green ecological species in aquatic organisms. Two years ago, Fox noticed that the total number of one kind of big conch had been greatly reduced in decades, while the other kind had disappeared on the outer continental shelf. In other benthic organisms in the same water area, she also found a similar strange situation: some species in the cold sea area are moving south, from deep water to shallow water. Generally speaking, the distribution range has become smaller, and the new habitat is warmer and more dangerous than before.

After in-depth study, she found that benthic organisms generally ovulate at a certain temperature on the sea surface, while in the middle of the Atlantic Ocean, this time range is generally late spring and early summer. In recent decades, the average sea surface temperature has risen by 2℃, prompting the deep sea to reach the temperature threshold ahead of schedule, and the ovulation period of benthic organisms has been advanced by about one month. The flow of seawater along the continental shelf accelerated in early spring and then slowed down. If the ovulation time of benthic organisms is too early, its larvae are likely to drift too far along the coast.

Then, biologists expanded the species category of scientific research, collected the data information of 50 species from public databases and made the distribution map of their ovulation time and address, filled in the information content of temperature changes in different regions for decades, and finally got the long-term changes of species distribution according to the harm of ovulation time to larva migration.

In theory, the habitats of most species are likely to become wider; In fact, compared with 1950- 1980, the species distribution category actually decreased by 10%, including eels and mussels which play a key role in the intertidal ecosystem and have considerable economic benefits. This discovery worries biologists.

Biologists say that this result may not be universally applicable to all countries in the world, but in areas where the above situation exists, it is necessary to consider how to assist this species to migrate to an integrated natural environment.