Dear colleagues, We are pleased to share with you our latest research article entitled: "Acoustic Parameters of Guiana Dolphin (*Sotalia guianensis*) whistles in the Southern Gulf of Venezuela", to be publish in the next issue of Aquatic Mammals journal (available online on 1st of June/2016). Due to the journal’s policy the pdf file cannot be uploaded on any web page. For pdf copies please send an email to *hector.barriosgarrido@my.jcu.edu.au <hector.barriosgarrido@my.jcu.edu.au> or hbarriosg@gmail.com <hbarriosg@gmail.com>* Please find below the citation and abstract. Best regards, Prof. Hector Barrios-Garrido Lcda. Kareen De Turris-Morales Lcda. Gabriela Delgado-Ortega Br. Chloe M. Nash MSc. Ninive Espinoza-Rodriguez *Acoustic Parameters of Guiana Dolphin (Sotalia guianensis) whistles in the Southern Gulf of Venezuela* *Abstract* The Guiana dolphin, *Sotalia guianensis*, is widely distributed along the coasts of Central and South America. Similar to other delphinids, this species emits echolocation clicks, burst pulses, and whistles. Although whistling seems to play a major role in the social organisation of dolphins, there is a lack of knowledge about Guiana dolphin whistles outside of populations in Brazil and Costa Rica. In this study, we describe the acoustic structure of Guiana dolphin whistles from the southern Gulf of Venezuela for the first time. We recorded the whistles using an omnidirectional hydrophone (CR1). For each whistle, we measured maximum frequency (kHz), minimum frequency (kHz), starting frequency (kHz), ending frequency (kHz), duration (s), and number of inflection points, using spectrograms created in SpectraLAB 4.32 software (v. 17). Whistles presented an average starting frequency of 10.58 kHz (SD=2.49 kHz), a mean ending frequency of 13.96 kHz (SD=2.60 kHz), an average minimum frequency of 10.31 kHz (SD=2.33 kHz), a mean maximum frequency of 13.96 kHz (SD=2.51 kHz), an average duration of 0.27 s (SD=0.14 s), and a maximum of 4 inflection points (mode 0). This research provides new insights into the acoustic behaviour of the Guiana dolphin in the Gulf of Venezuela. *Key Words: * Guiana dolphin, *Sotalia guianensis*, acoustic structure, acoustic parameters, Gulf of Venezuela, cetacean *Citation*: Barrios-Garrido, H., De Turris-Morales, K., Delgado-Ortega, G., Nash, C.M., Espinoza-Rodríguez, N. 2016. Acoustic Parameters of Guiana Dolphin (*Sotalia guianensis*) whistles in the Southern Gulf of Venezuela. *Aquatic Mammals*, 42(2): 127-136, doi: *10.1578/AM.42.2.2016.127* -- *********************************************** Hector Barrios-Garrido. PhD Candidate- Candidato a Doctor. College of Marine & Environmental Sciences Centre for Tropical Water and Aquatic Ecosystem Research James Cook University, Townsville, QLD 4811 Australia. Biólogo-Biologist. Magister en Ecologia Aplicada. Master in Applied Ecology. IUCN/SSC Marine Turtle Specialist Group Member. International Sea Turtle Society Member. Laboratorio de Ecologia General Departamento de Biologia Facultad Experimental de Ciencias La Universidad del Zulia Grupo de Trabajo en Tortugas Marinas del Golfo de Venezuela (GTTM-GV) Presidente Fundador-President (Founder) Centro de Modelado Cientifico (CMC) Eje: BioCiencias. Townsville, Queensland, Australia. alt.email: hector.barriosgarrido@my.jcu.edu.au Skype: hector.barrios.garrido PUBLICATIONS: https://www.researchgate.net/profile/Hector_Barrios-Garrido https://scholar.google.com/citations?user=1-jYN84AAAAJ&hl=es