Results 181 to 190 of about 2,162 (213)
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Underwater audiogram of a tucuxi (Sotalia fluviatilis guianensis)
The Journal of the Acoustical Society of America, 1998Using a go/no go response paradigm, a tucuxi (Sotalia fluviatilis guianensis) was trained to respond to pure-tone signals for an underwater hearing test. Auditory thresholds were obtained from 4 to 135 kHz. The audiogram curve shows that this Sotalia had an upper limit of hearing at 135 kHz; from 125 to 135 kHz sensitivity decreased by 475 dB/oct. This
M, Sauerland, G, Dehnhardt
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Population parameters of Guiana dolphins (Sotalia guianensis) in a southern Brazilian estuary
Mammalian Biology, 2023Populations of many coastal cetaceans are threatened by negative anthropogenic impacts. Key precursors to effective recovery plans include understanding life histories and population parameters to establish baselines for subsequent changes. Here, we provide this information for one of the largest populations of Guiana dolphins (Sotalia guianensis), in ...
Stephane P. G. de Moura +4 more
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Sensitivity of a tucuxi (Sotalia fluviatilis guianensis) to airborne sound
The Journal of the Acoustical Society of America, 2005Auditory systems of cetaceans are considered highly specialized for underwater sound processing, whereas the extent of their hearing capacity in air is still a point of issue. In this study, the sensitivity to airborne sound in a male tucuxi (Sotalia fluviatilis guianensis) was tested by means of a go/no go response paradigm.
Alexander, Liebschner +4 more
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Burst pulses of Guiana dolphin (Sotalia guianensis) in southeastern Brazil
The Journal of the Acoustical Society of America, 2017Acoustic studies of Guiana dolphin have been focused on whistles, with little known about pulse signals in this species. This study characterized the temporal and spectral properties of Guiana dolphin burst pulses. Groups of 2 to 23 Guiana dolphins were recorded while feeding and socializing in shallow waters in Guanabara Bay, southeastern Brazil, in ...
Luciana Guimarães de, Andrade +3 more
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Habitat use of Guiana dolphin Sotalia guianensis in a heavily urbanized embayment
Marine Ecology Progress Series, 2023Understanding environmental and anthropogenic variables that influence the presence of dolphins in coastal areas is fundamental for conservation planning and forecasting. In this study, we applied generalized additive models to identify areas of high probability of occurrence of Guiana dolphins in Mucuripe embayment, a heavily urbanized area in ...
ACO Meirelles +4 more
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Latitudinal variation in whistle structure of the estuarine dolphin Sotalia guianensis
Behaviour, 2006[Analyses of intraspecific variation in behaviour can provide insights into the process of behavioural diversification. In this study we characterized geographic variation in whistle structure of the estuarine dolphin, Sotalia guianensis, at 10 sites of a ∼4000 km transect along the coast of Brazil.
Rossi-Santos, MR, Podos, J
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The Journal of the Acoustical Society of America, 2014
Signature whistles have been widely studied in bottlenose dolphins (Tursiops truncatus). A recent study suggested the occurrence of signature whistles in Guiana dolphins (Sotalia guianensis) but could not identify the whistlers. The objective of this study is to describe the whistle characteristics in the population of S.
de Moura Lima, Alice, Le Pendu, Yvonnick
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Signature whistles have been widely studied in bottlenose dolphins (Tursiops truncatus). A recent study suggested the occurrence of signature whistles in Guiana dolphins (Sotalia guianensis) but could not identify the whistlers. The objective of this study is to describe the whistle characteristics in the population of S.
de Moura Lima, Alice, Le Pendu, Yvonnick
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Herpesviral infection in a Guiana dolphin (Sotalia guianensis) from the northern coast of Brazil
Journal of Veterinary Diagnostic Investigation, 2017We describe herein herpesvirus-associated genital lesions in a Guiana dolphin ( Sotalia guianensis) from the northern Brazilian coast. Papillary lesions on the vulva, with epithelial hyperplasia, swollen keratinocytes, and intranuclear inclusions, were positive for a herpesvirus ( Gammaherpesvirinae subfamily).
Seade, Gisele C. C +12 more
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2013
Guiana dolphins (Sotalia guianensis) are small cetaceans that inhabit coastal regions down to a 50 m depth. As a coastally distributed species, they are exposed to a variety of human-induced risks that include passive fishing nets, persistent environmental pollution, and emerging diseases. As a top predatorS. guianensis occupies an important ecological
Jailson Fulgencio, de Moura +4 more
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Guiana dolphins (Sotalia guianensis) are small cetaceans that inhabit coastal regions down to a 50 m depth. As a coastally distributed species, they are exposed to a variety of human-induced risks that include passive fishing nets, persistent environmental pollution, and emerging diseases. As a top predatorS. guianensis occupies an important ecological
Jailson Fulgencio, de Moura +4 more
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Timing of ontogenetic changes of two cranial regions in Sotalia guianensis (Delphinidae)
Mammalian Biology, 2012Despite the fact that heterochronic processes seem to be an important process determining morphological evolution of the delphinid skull, previous workers have not found allometric scaling as relevant factor in the differentiation within the genus Sotalia. Here we analyzed the skull ontogeny of the estuarine dolphin S.
Nicolle V. Sydney +2 more
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