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You may be wondering about seaweed and whether it is washing ashore on the beaches in the Riviera Maya. We are seeing some sargassum landings this season, as we did in 2018. However, it is important to note that landings occur from time to time, they are not constant, and that not all beaches are affected.

The authorities are monitoring satellite imagery to forecast when patches of seaweed may approach the coast. The Federal government has designated the Navy to coordinate the beach cleaning campaign.

What is Sargassum?

It is natural for seaweed to wash up on the beach from season to season, after storms and in the summer heat. However, in recent years we have been seeing larger quantities of two species of seaweed known as Gulfweed or Sargassum (Sargassum natans and Sargassum fluitans) coming ashore in the Riviera Maya, Cancun and other parts of the Mexican Caribbean. Similar landings occur in the Caribbean islands, West Africa and along the Gulf coast of the United States, including Florida.

The word Sargassum or Sargasso comes from the Portuguese word sargaço, which means “little grapes,” a reference to the air-filled bladders that enables this species of seaweed to float on the surface and move with the currents. Unlike other algae that are rooted in the seabed or attached to rocks or corals, pelagic or free floating sargassum grows and reproduces as it drifts through the water.

Pelagic Sargassum is historically associated with the Sargasso Sea in the North Atlantic Ocean where vast patches of it are a habitat for marine life such as microscopic plants, shrimp, crabs, sea horses, baby fish and turtles.

Sometimes ocean currents transport lines or patches of this seaweed to areas beyond the Sargasso Sea. However, biologists believe that the sargasso that is affecting the Caribbean region and the coast of Quintana Roo has a different source, thousands of kilometers to the south. They have discovered that the seaweed is now flourishing in a second area off the coast of Brazil in the tropical Atlantic. Mats of it drift on ocean currents and are dispersed throughout the Caribbean.

Why has there been so much of it in recent years?

The causes of the seaweed proliferation or blooms have been attributed to climate change, which is triggering rising sea temperatures, and the presence of excessive nutrients in the water. Organic matter from deforestation, fertilizers and other chemicals in runoff from the Amazon River and its many tributaries (and from coastal areas of other countries the seaweed passes on its journey north) provide the nutrients that the seaweed needs to grow.

What is being done to clean the beaches?

In the Mexican Caribbean, a campaign is underway to collect seaweed when it lands on public beaches. Brigades are working along the coast including Xcalak, Mahahual, the Tulum area and Playa del Carmen.

The Mexican government has designated the Mexican Navy to coordinate initiatives this year. The Quintana Roo State government divided the coast into nine sectors in which many hotels and resorts will have their own cleaning programs and will coordinate with the authorities and there are volunteer beach cleaning initiatives too.

In addition to beach cleaning brigades, floating barriers may be installed along certain stretches of coastline susceptible to sargassum landings in order to deflect it and reduce the amount coming ashore. Specially equipped boats will be used to collect the seaweed while at sea.

In Cancun and Playa del Carmen, the municipal governments have said that a portion of the Environmental Fee charged to hotel guests will be tagged for beach cleaning.

When seaweed accumulates in the shallows in areas where there is little wave action, for example in reef lagoons or in sheltered inlets, it begins to decompose, giving the water a brown tint and pungent odor. As it breaks down, the amount of oxygen in the water is depleted, and the sunlight that sea grass and coral reefs need for growth is blocked. This can weaken coral communities, making them more vulnerable to disease, and harm fish and other marine life.

Puerto Morelos Protocol

In the municipality of Puerto Morelos, the local authorities, hotels, conservationists and biologists from the UNAM (National University of Mexico) research station joined forces and issued the Puerto Morelos Protocol on the best ways to collect seaweed and dispose of it.

They propose an approach including boats to harvest the seaweed before it hits the coast, installing floating barriers and cleaning brigades that use methods that protect the beach and reduce the amount of sand removed with the seaweed.

Seaweed washing up on the shoreline should be transferred to a single landfill site, which must be covered with a geo-membrane to prevent salt and organic seepage contaminating the water table as the seaweed dries out.

Possible uses for the seaweed collected are also being studied. If properly processed, it can be used as a fertilizer, in the food, pharmaceutical, textile or construction industry or for biofuel. Some local companies are experimenting with making paper, cardboard and containers from seaweed. One enterprising Puerto Morelos ecologist has even built and donated houses for low-income families made with bricks containing compressed seaweed.

Royal Resorts

An external company has been hired for the season to clean the beach at The Royal Sands, The Royal Caribbean and The Royal Islander in the morning using a tractor sweeper and a cleaning brigade will be brought in three days a week from 7 a.m. to 3 p.m. If additional help is needed at any time, Gardening and Security staff will join in.

The Royal Haciendas

Beach cleaning takes place every day from 7 a.m. to 3 p.m. and for longer if necessary. In addition to the resort’s beach sweeper, a beach cleaning brigade of 14 external workers has been hired. Some Gardening and Cleaning staff also participate for at least four hours a day and for the entire shift if the situation warrants it.

Grand Residences by Royal Resorts

At Grand Residences by Royal Resorts to the south of Puerto Morelos, a mechanized beach sweeper operates six hours a day if needed. The resort’s team of gardeners is also on call to offer additional support should it become necessary.

Turtle nesting season

It is turtle nesting season and adult turtles may struggle when there is excessive seaweed on a beach where they are trying to come ashore to lay their eggs. Conservationists are concerned that the hatchlings may become entangled in it and will be watching over them later in the season.

Beach cleaning rules limit the use of heavy machinery on dry sand to prevent it from compacting or causing irreversible damage to turtle nests and eggs. Tractors can only be used on the shoreline where the waves break and during the morning, not in the evening.

Seaweed fast facts

•Seaweed washes up on the beach naturally

•Seaweed is an important habitat for marine life

•The presence of seaweed does not mean that the beach is polluted

•You can still swim in the sea but with care. Avoid swimming through large patches of seaweed

•Showering after swimming is recommended

•Rinse out your swimsuit after use

Seaweed will not sting you. However, microscopic creatures or insects may be trapped in the weed and can occasionally irritate the skin, hence the recommendation to rinse off after sea bathing

We hope that this information is useful. You can check the Royal Resorts webcams to see how the beaches are looking. Further updates may also be published during the summer on the Royal Resorts blog.

[Sources: Puerto Morelos information, Puerto Morelos Protocol]