THE RISE OF WATER TEMPERATURE THREATENS THE SURVIVAL OF SHARKS AND RAYS

According to the US National Oceanic and Atmospheric Administration, the average global ocean surface temperature has increased by about 0.13 degrees Celsius per decade over the past 100 years.

The study, published in the journal Conservation Physiology, found that about 45 percent of sharks lay eggs, and the eggs are shaped like a “mermaid’s purse.” It can take up to a year before they hatch, so the survival of these embryos is crucial to the survival of the species. These embryos will become immobile, meaning that they will stop moving and predators will not notice them. However, the rising sea temperature will shorten the time of immobility. The same phenomenon occurs with stingray eggs.

Daniel Ripley of the University of Manchester, UK, lead author of the study, and other researchers looked at how long the embryos remained immobilized in water between 15 degrees Celsius and 20 degrees Celsius. From that, they found immobilization time was reduced 7 times at a temperature of 20 degrees Celsius.

According to Daniel Ripley, this study shows that the number of sharks and rays may decrease because as the oceans warm, their young will be eaten. “It’s impossible to say exactly how this will affect ocean ecosystems, but it will be a direct and increasingly severe impact,” said Daniel Ripley.

In March 2020, according to a study by another research group, rising ocean temperatures globally as a result of climate change are causing marine species such as birds and plants to flee from the equator. the poles of the Earth.

Sources: Conservation Physiology