A 'red tide' swept over many Atlantic Ocean beaches in Argentina, including Mar del Plata and Quequén, caused by the massive shedding of macroalgae from deep waters.
Winds contributed to the intensity of the phenomenon. The detached algae, which grow on rocky bottoms, were dragged towards the shore by large waves and currents, leading to the accumulation of extensive bands of algae along the coastline.
In many coastal resorts, such as Mar del Plata, a strong odor emanated from the algae after several hours of exposure to sunlight on the sand, causing annoyance to bathers and disturbing many people who were swimming.
"The phenomenon known as 'arribazón' derives from a combination of high tides and strong winds, which detach underwater vegetation usually anchored to the seabed and among rocks," said marine biologist Ricardo Silva from the National Institute for Fisheries Research and Development (INIDEP), as reported by La Repubblica. "It is a natural phenomenon we call here 'arribazones' associated with large algae," Silva said.
Silva noted that he could not confirm a link between the phenomenon and climate change, despite the exacerbation of 'unusual winds' from the northeast. "But if we study it more over the years, we will certainly find some relationship," he added.
Specialists have clarified that the reddish hue observed in the water is not linked to toxic microorganisms, and the algae involved do not pose any health or environmental risk, as reported by Los Andes. These native algae, which grow on rocky bottoms, are not an invasive species.
In Mar del Plata, the municipality implemented operations to remove volumes of algae remnants in the Playa Varese area, as stated by Los Andes. The accumulation of algae was particularly noticeable in Playa Varese, which, due to its bay-like shape, acts as a trap for suspended algae. With each low tide, the effect of the algae accumulation became more visible as the water receded, leaving a mound of algae on the beachfront, along with other elements of marine life.
In Necochea, authorities are preparing to carry out similar tasks to remove algae, as the rising sea is not enough to carry away the debris, according to Los Andes. The cleaning work will involve trucks that will transport the quantity of algae to a final disposal site for organic waste.
The article was written with the assistance of a news analysis system.