Results 151 to 160 of about 8,460 (181)
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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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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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Whistles of boto, Inia geoffrensis, and tucuxi, Sotalia fluviatilis
The Journal of the Acoustical Society of America, 2001Whistles were recorded and analyzed from free-ranging single or mixed species groups of boto and tucuxi in the Peruvian Amazon, with sonograms presented. Analysis revealed whistles recorded falling into two discrete groups: a low-frequency group with maximum frequency below 5 kHz, and a high-frequency group with maximum frequencies above 8 kHz and ...
W, Ding, B, Würsig, S, Leatherwood
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Distribution of the South American dolphin Sotalia fluviatilis
Canadian Journal of Zoology, 1991The marine form of the South American dolphin Sotalia fluviatilis has an extensive and possibly continuous distribution, from the Florianópolis region, Brazil (27°35′S, 48°34′W), north to Panama (~9°22′N, 79°54′W). The high number of records from 25–20°S is due to the presence of many observers in those latitudes.
Mônica Borobia +3 more
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Whistles of tucuxi dolphins (Sotalia fluviatilis) in Brazil: Comparisons among populations
The Journal of the Acoustical Society of America, 2005A quantitative and comparative analysis of the acoustic whistles parameters of tucuxi dolphins (Sotalia fluviatilis) from eight areas in Brazilian waters were conducted. Tucuxi produced mainly upsweep whistles, and despite their similar characteristics to other delphinids, whistles were shorter and less complex in shape.
Alexandre F, Azevedo, Monique, Van Sluys
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Lipids, 1975
AbstractThe melon and jaw lipids of the freshwater dolphinSotalia fluviatilis are composed mainly of isovaleroyl wax esters and diisovaleroyl triglycerides. The blubber fat contains only a trace of wax ester and is mostly tri‐ (long chain) and monoisovaleroyl triglycerides.
R G, Ackman +3 more
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AbstractThe melon and jaw lipids of the freshwater dolphinSotalia fluviatilis are composed mainly of isovaleroyl wax esters and diisovaleroyl triglycerides. The blubber fat contains only a trace of wax ester and is mostly tri‐ (long chain) and monoisovaleroyl triglycerides.
R G, Ackman +3 more
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Whistles of small groups of Sotalia fluviatilis during foraging behavior in southeastern Brazil
The Journal of the Acoustical Society of America, 2005Whistle emissions were recorded from small groups of marine tucuxi dolphins (Sotalia fluviatilis) in two beaches located in an important biological reserve in the Cananéia estuary (25°03′S, 47°58′W), southeastern Brazil. A total of 17h of acoustic data was collected when dolphins were engaged in a specific feeding foraging activity.
Daniela, Pivari, Sergio, Rosso
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Molecular Ecology Notes, 2007
AbstractTwelve dinucleotide polymorphic microsatellite loci were isolated from the marine tucuxi dolphin (Sotalia guianensis). Levels of genetic diversity were assessed using 34 individuals from the coasts of Rio de Janeiro and Pará, Brazil. Numbers of alleles varied between two and 14, and observed and expected heterozygosities ranged from 0.040 to 0 ...
HAYDÉE A. CUNHA, PHILLIP C. WATTS
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AbstractTwelve dinucleotide polymorphic microsatellite loci were isolated from the marine tucuxi dolphin (Sotalia guianensis). Levels of genetic diversity were assessed using 34 individuals from the coasts of Rio de Janeiro and Pará, Brazil. Numbers of alleles varied between two and 14, and observed and expected heterozygosities ranged from 0.040 to 0 ...
HAYDÉE A. CUNHA, PHILLIP C. WATTS
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RETINAL TOPOGRAPHY AND VISUAL ACUITY IN THE RIVERINE TUCUXI (SOTALIA FLUVIATILIS)
Marine Mammal Science, 1999AbstractThe distribution and size of ganglion cells in the retina of two tucuxi were investigated. Retinal cell size varied from 10 to 50 μm with a polymodal size distribution; major groups were seen with sizes of 8‐20, 21‐35, and more than 35 μm. Ganglion cells concentrated at two spots of the highest density in the nasal and temporal quadrants, about
Alla M. Mass, Alexander Ya. Supin
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Environmental Pollution, 2003
Lead (Pb), cadmium (Cd) and mercury (Hg) concentrations on liver and kidney of Sotalia fluviatilis (Cetacea: Delphinidae) stranded in the coast of Ceará, Brazil, were studied from 1996 to 1999. Pb levels were usually lower than the detection limit (0.1 microg/g).
Cassiano, Monteiro-Neto +2 more
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Lead (Pb), cadmium (Cd) and mercury (Hg) concentrations on liver and kidney of Sotalia fluviatilis (Cetacea: Delphinidae) stranded in the coast of Ceará, Brazil, were studied from 1996 to 1999. Pb levels were usually lower than the detection limit (0.1 microg/g).
Cassiano, Monteiro-Neto +2 more
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