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Stereotypical vocalisations can facilitate long-distance communication in dense and, thus, sound-degrading forest habitats. Despite this, primate vocal repertoires often also include gradations between different call types that are used in social interactions. Because many nocturnal primates show a solitary social structure, it has been difficult to assess the role vocalisations play in mediating their social encounters. Here we aim to expand on the call types of Sahamalaza sportive lemurs, Lepilemur sahamalaza, as well as investigate their variability and use in social contexts. Through long-term behavioural observations with concurrent recording of vocalisations of known and unknown individuals between 2015 and 2016, we described three previously unrecorded calls and expanded the vocal repertoire to 12 different call types that were used in both targeted social and broadcast solitary contexts. Linear discriminant function and cluster analysis supported initial observations that vocalisations within call types were variable and that at least two call types can be classified as "graded," contrary to expectations. Despite variations in call-context connections, no clear patterns of call use could be established. However, measurable differences in vocal behaviour between the seasons and the sexes indicate that calling is used in a reproductive context, similar to other nocturnal and diurnal primates.
This article was published in the following journal.
Name: Folia primatologica; international journal of primatology
Marmoset monkeys are known for their rich vocal repertoire. However, the underlying call production mechanisms remain unclear. By showing that marmoset moneys are capable of interrupting and modulatin...
Purpose Tracking of infants' progression through early vocal stages supports the identification of children at risk for language delays and guides early intervention for children with disabilities. Ho...
Vocal learning is a behavioral trait in which the social and acoustic environment shapes the vocal repertoire of individuals. Over the past century, the study of vocal learning has progressed at the i...
A well-recognized cause of dyspnea in athletes is vocal cord dysfunction (VCD). VCD is characterized by paradoxical vocal fold movement (PVFM) in which the vocal folds adduct (close) during inspiratio...
Deep breaths are one of three breathing patterns in rodents characterized by an increased tidal volume. While humans incorporate deep breaths into vocal behavior, it was unknown whether nonhuman mamma...
The proposed research will investigate the most effective strategy to reduce vocal exertion reported by speakers in noisy environments. Repeated vocal exertion can lead to voice problems a...
This study aims to observe the physiological effects of two different Semi-occluded vocal tract (SOVT) exercises in the larynx and pharynx when they are executed by individuals with consta...
The objective of this clinical and experimental study was to verify the immediate effect of vocal techniques: vibration, nasal sound and articulation in women without vocal complaints.
Systemic sclerosis is a systemic connective tissue disease with physical and mental disturbances. Based on a pilot study the feasibility and effectiveness of a novel, self-developed concep...
This research aims to evaluate the effects of vocal conditioning through two semioccluded vocal tract exercises (SOVTE) in choir singers.
A genus of the family Lemuridae consisting of five species: L. catta (ring-tailed lemur), L. fulvus, L. macaco (acoumba or black lemur), L. mongoz (mongoose lemur), and L. variegatus (white lemur). Most members of this genus occur in forested areas on Madagascar and the Comoro Islands.
A family of the order PRIMATES, suborder Strepsirhini (PROSIMII), containing four genera which inhabit Madagascar and the Comoro Island. Most of the lemurs prefer wooded areas. The four genera are Hapalemur, LEMUR, Lepilemur, and Varecia.
Communication through a system of conventional vocal symbols.
A pair of cone-shaped elastic mucous membrane projecting from the laryngeal wall and forming a narrow slit between them. Each contains a thickened free edge (vocal ligament) extending from the THYROID CARTILAGE to the ARYTENOID CARTILAGE, and a VOCAL MUSCLE that shortens or relaxes the vocal cord to control sound production.
A facility set up for the purpose of handling large volumes of telephone calls. Call Centers typically utilize some form of computer automation for receiving, dispatching, screening, logging and forwarding telephone calls.