Scientists have discovered how one of the world’s largest migration events, the sardine run, works.
Considered “the greatest shallow waters on earth,” this spectacular event involves hundreds of millions of sardines moving from the cold temperate core range to the warm subtropical waters of the Indian Ocean in eastern South Africa. Coast..
The sardine flow is caused by the upwelling of cold water on the southeastern coast, and as it swarms north, it is sandwiched between the coast and the southward heat flow that exceeds the sardine’s physiological capacity. After that, they are preyed on by huge numbers of dolphins, sharks, seabirds and even whales. This is an event featured in many nature documentaries.
Journal new research Science Advances South African and Australian scientists have tested the hypothesis that sardine orchids represent spawning Migration Clear East Coast resources adapted to warm subtropical conditions. Scientists have generated genomic data for hundreds of sardines from all over South Africa.This is mainly water temperature Along the coast.
The results showed two sardine populations in South Africa. One is on the cool temperate west coast (Atlantic Ocean) and the other is on the warm east coast waters (Indian Ocean). The population of each region appears to be adapted to the temperature range experienced in the native region.
“Surprisingly, we also found that the sardines participating in the migration run are primarily of Atlantic origin and prefer colder water,” said Flinders University, one of the research authors. Professor Luciano Beheregaray of the Institute for Molecular Ecology says.
“Cold water with short upwelling periods attracts sardines on the west coast that are not adapted to warmer Indian Ocean habitats,” says Johannesburg author Peter Tesuke.
“This is a rare finding in nature. Why do we do this when the transition has no obvious fitness benefits?” The sardine migration may be a relic of spawning behavior dating back to the glacial period. there is. Today, the subtropical Indian Ocean habitat was an important sardine farm for cold water at the time, “says Professor Tesuque.
The execution of this visually breathtaking move attracts tourists from all over the world who are keen to get a glimpse of the underwater sight, but it may not last forever.
“Given the cold water Origin of sardine Participating in orchids can lead to the end of sardine orchids due to the expected warming, “says Professor Beheregalai. One of the most spectacular migrations in nature, the impact on the entire population can be negligible.
Sardines running in southeastern Africa are mass migrations to ecological traps. Science Advances (2021). DOI: 10.1126 / sciadv.abf4514
Quote: The world-famous sardine migration described by Genomics (September 15, 2021) is from https://phys.org/news/2021-09-world-famous-sardine-migration-genomics.html Acquired on September 15, 2021
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World-famous sardine migration as explained by genomics
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