Alguns autores relatam que o repertório acústico de Sotalia guianensis apresenta dialetos como reflexo geográfico entretanto, outros autores propõem que as características do ambiente são o fator que impõem essas variações.
It is possible that the variation of the sound parameters between the CC and GLC environments is a reflection of the species’ adaptive potential, since a population can adjust the sounds emitted by its individuals to the environment’s features, revealing acoustic plasticity.Ī pressão seletiva do ambiente sobre as espécies ali viventes pode selecionar adaptações como um todo, inclusive no contexto acústico específico. The pulsed calls’ sound category did not present modification between habitats probably due to context in which they are used since they occur during high physical contact. Variations in the dolphins’ sounds may be related to differences in the environments such as natural background noise-biotic and abiotic-and characteristics such as turbidity, temperature, salinity, and modification in sound propagation due to depth and bottom properties. At the GLC, dolphins use higher whistle frequencies as well as higher number of click per second, facts that may be related to sound precision for communication between individuals and prey capture. guianensis modifies its sound emissions at the Curral Cove (CC) and the Guaraíras Lagoon Complex (GLC), different habitats at similar latitudes. However, others propose that the environmental characteristics are the factor that imposes these variations. Some authors report that the acoustic repertoire of Sotalia guianensis presents dialects as a geographical reflection. Selective pressure from the environment on species may select adaptations as a whole, including the specific context of acoustics.
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