Mexico Caribbean beaches may see worst sargassum since 2018

Apr 29, 2022, 9:01 AM | Updated: Apr 30, 2022, 10:21 am
A boat floats on the water, surrounded by  sargassum, a seaweed-like algae, in Bahia La Media Luna,...

A boat floats on the water, surrounded by sargassum, a seaweed-like algae, in Bahia La Media Luna, near Akumal in Quintana Roo state, Mexico, Aug. 5, 2018. With more algae spotted floating out at sea, experts fear that 2022 could be as bad or worse than the catastrophic year of 2018, the biggest sargassum wave to date. (AP Photo/Eduardo Verdugo, File)

(AP Photo/Eduardo Verdugo, File)

MEXICO CITY (AP) — Mexican authorities say the problem of foul-smelling seaweed-like algae on the country’s Caribbean coast beaches is “alarming.”

The arrival of heaps of brown sargassum on the coast’s normally pristine white sand beaches comes just as tourism is recovering to pre-pandemic levels, though job recovery in the country’s top tourist destination has been slower.

With more algae spotted floating out at sea, experts fear that 2022 could be as bad or worse than the catastrophic year of 2018, the biggest sargassum wave to date.

“We can say the current situation is alarming,” said Navy Secretary José Ojeda, who has been entrusted with the apparently hopeless task of trying to gather sargassum at sea, before it hits the beaches.

The Navy currently has 11 sargassum-collecting boats operating in the area. But the Navy’s own figures show that the portion they have been able to collect before it hits the beach has been falling.

In 2020, the Navy collected 4% of sargassum at sea, while 96% was raked off beaches. But that figure fell to 3% in 2021 and about 1% so far in 2022.

Allowing the algae to reach the beaches creates not only a problem for tourists, but for the environment, said Rosa Rodríguez Martínez, a biologist in the beachside town of Puerto Morelos who studies reefs and coastal ecosystems for Mexico’s National Autonomous University.

So much algae is reaching the beaches that hotels and local authorities are using bulldozers and backhoes, because the normal teams of rakes, shovels and wheelbarrows are no longer enough.

“The heavy machinery, when it picks it (sargassum) up, takes a large amount of sand with it,” contributing to beach erosion, Rodriguez Martinez said. “There is so much sargassum that you can’t use small-scale equipment anymore, you have to use the heavy stuff, and when the excavators come in, they remove more sand.”

Rodríguez Martinez worries that 2022 could be worse than the previous peak year. “In the last few days there have been amounts washing up, and in places, that I didn’t see even in 2018,” she said.

However, the University of South Florida Optical Oceanography Lab said in a report that “2022 is likely going to be another moderate or major sargassum year,” with observable amounts in all waters lower than in 2018 and 2021.

But given the vagaries of ocean currents, it may just be a very bad year for Mexico. Rodríguez Martinez is already suffering the effects herself, at her beachside offices.

“Where I am, I’m about 50 meters (yards) from the beach and the smell is very unpleasant,” she said. “Right now my head is hurting and another friend said her head hurts, and I said it must be the (hydrogen) sulfide gas from the sargassum, no?”

The problem comes just as resorts like Cancun, Playa del Carmen and Tulm are recovering from the brutal two-year drop in tourism caused by the coronavirus pandemic. Not all beaches have been hit equally; many in Cancun and Isla Mujeres are often free of much sargassum, but much of the Riveria Maya has been hit hard.

Carlos Joaquin, governor of the coastal state of Quintana Roo, said the number of tourists arriving by air so far this year — some 3.54 million travelers — is 1.27% above 2019 levels, before the pandemic. But Joaquin said that only about 83% of the 98,000 jobs lost during the pandemic have returned.

Sergio León, the former head of the state’s employers’ federation, said the seaweed invasion “has definitely affected us, it has affected our image on the domestic and international level. Obviously, not just visually, but in term of environmental damage and pain.”

“The Navy is making an effort, but it needs more, it isn’t enough,” said León. “The ideal thing would be to gather it before it gets to our beaches.”

Rodriguez Martinez said that, given the limited number of Navy boats and funds, the best solution might be to hang floating offshore barriers and collect the sargassum in waters closer to the shore.

But she notes another problem: what to do with the thousands of tons of stinking algae collected each year, mainly by private hotel owners. Some have simply been tossing the mounds collected from the beach into disused limestone quarries, where the salt and minerals collected in the ocean can leech into groundwater.

Other simply toss into woodlands or mangrove swamps, which is equally as bad.

“The algae has a lot of salt … so that is not good, even for palm trees, which are pretty salt resistant,” she noted.

While some have tried to use sargassum to create bricks or fertilizer, the lack of official policies and long term plans make it hard to obtain big investments for such plans.

Initial reports in the 2010s suggested the masses of seaweed came from an area of the Atlantic off the northern coast of Brazil, near the mouth of the Amazon River. Increased nutrient flows from deforestation or fertilizer runoff could be feeding the algae bloom.

But other causes may contribute, like nutrient flows from the Congo River, increased upwelling of nutrient-laden deeper ocean water in the tropical Atlantic and dust blowing in from Africa.

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Mexico Caribbean beaches may see worst sargassum since 2018