The pollution due to the presence of microplastics in marine habitats in coastal areas declared as Ramsar sites is a global concern and a trend in research due to its nature and its potential harmful impact on the marine life . In the present study, microplastics in beach sand were analyzed at eight sampling points, during an annual cycle at Ramsar sites 1826 and 2025 number on the coast of the state of Sinaloa, Northwestern Mexico. 108 sand samples were analyzed, 400 grams of each kilogram of sample were randomly selected, which was digested, filtered, separated, dried and stained to identify its characteristics, number, length, color and shape of the microplastics with the support fluorescence microscopy. A total of 2,691 microplastics were found, distributed in 6 different types. At Ramsar site 1826, 286 (Polyethylene 162, >elastic band 76, >polyethylene terephthalate 23, >High-density polyethylene 18, >nylon 7 and 2405 microplastics were found at Ramsar site 2025 (polyethylene 1206, >nylon 966, > polystyrene 193, > polyester fibers 37, > polyethylene terephthalate 3. Most of the types of plastics found are from materials found in fishing nets and disposable bags, it is suggested that there is a synergistic relationship between the generation garbage due to fishing activity and the lack of proper management of plastic waste on the region’s beaches.
Palabras clave: Microplastics; Ramsar sites; B each sand; L agoon systems; Northwestern México.