Will Spain see more jellyfish this summer? « Euro Weekly News

Jellyfish populations may increase along Spain’s coastline as summer approaches, experts have suggested.

“Despite the increasing trend, it is too early to predict that jellyfish will be present on the Spanish coast this summer in 2024,” said Professor Josep María Giri from CSIC Sea’s Department of Marine Biology and Oceanography. About.

Effect of climate on jellyfish numbers

The jellyfish life cycle typically begins in earnest in late spring and continues throughout the summer. Rising ocean temperatures, a direct effect of climate change, are causing these marine species to begin breeding earlier, thereby lengthening their reproductive cycles.

“If the water temperature rises further and that water temperature persists further, the polyps will develop jellyfish sooner. And they will appear a month earlier,” Giri explains. This change not only increases the number of jellyfish each year, but also means that there can be two generations of jellyfish in one summer.

human activity and geography

Overfishing and reduced biodiversity have reduced the number of predators, reducing the natural means to control jellyfish populations.

Geographical factors also play a role. Schools of jellyfish are often swept to shore by sea breezes and surface currents, increasing their presence on the coast.

Drought and coastline change

The arrival of jellyfish swarms is usually delayed until late summer as rains and rivers cool the fresh water.

However, Professor Giri points out that drought and reduced flows from rivers are changing this pattern, saying that “continental influence from rain and rivers acts as a natural barrier, keeping large swarms of jellyfish away from the coast. “That’s why there are so many swarms of jellyfish.” When we reached the coast, large flocks had arrived all summer long. ”

Despite the increasing presence of jellyfish, it is unlikely that any beach in Spain will have a jellyfish outbreak lasting more than 20 days during the summer, and it is unlikely that any beach will have a jellyfish outbreak for more than 3 consecutive days. there is no.

Tourists and locals alike do not need to be alarmed and are advised to stay informed as the Mediterranean coast prepares for the typical jellyfish season in July, August and September. Recommended.

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