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This research presents the diversity of the aquatic and semiaquatic birds in Changuinola Lagoon, Bocas Del Toro, throughout the months of march to july of 2018. The goal of the research was to relate the species richness of the aquatic and semiaquatic birds with the physicochemical factors present in the lagoon. An amount of 213 individuals, belonging to eight orders, 11 families, 23 genres and 30 species were registered. The wealthiest families were Ardeidae recording 10 species for a total of 33.33% and the family Alcedinidae recording five species for a 16.67 % of total. The Shannon-Wiener diversity index for the total waterbird sample was H´ = 3.06. According to its abundance range Bubulcus ibis and Pelecanus occidentalis, are the most abundant species. Duncan's test showed that there is an association between pH and wealth of the birds. The unacceptable values ??of Nitrates and dissolved oxygen indicated toxicity of the medium. It is concluded that the physicochemical parameters modify the wealth and abundance of birds.