Natural history of dolphins of the genus Sotalia

Rosas, Fernando C. W.; Marigo, Juliana; Laeta, Maíra; Rossi‐Santos, Marcos R.

doi:10.5597/lajam00154

Cited by 16 publications

(18 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The fact that most animals accidentally captured were at reproductive stage may play a role in population decline, though no in-depth study has evaluated the risks S. guianensis is exposed to. Due to the threats faced by the specimens, it has been has suggested that the species should be considered vulnerable, in light of the threats it has had to face (Rosas, 2006).…”

Section: Discussionmentioning

confidence: 99%

Variation of age and total length in Sotalia guianensis (Van Bénéden, 1864) (Cetacea, Delphinidae), on the coast of Espírito Santo state, Brazil

et al. 2016

View full text Add to dashboard Cite

Variations of age and total length of Sotalia guianensis from the state of Espírito Santo, Brazil, were evaluated. Specimens were found stranded. Age and total length of 44 Guiana dolphins were assessed based on tooth analysis. Age varied between 0.5 year and 33 years (mean = 8.23 years). Most specimens were between zero and 6 years old (47%). Total length varied from 119 cm to 198 cm, with mean of 172.52 cm. Asymptotic length was reached at 185 cm and approximately 5-6 years of age. Mean total length and age were higher than in other regions of the distribution range of the species. Nevertheless, more studies have to be carried out to evaluate the morphological variations in S. guianensis populations in the study area and Brazil.Keywords: Guiana dolphin, age, total length. Variação etária e de comprimento total de

show abstract

Section: Discussionmentioning

confidence: 99%

Variation of age and total length in Sotalia guianensis (Van Bénéden, 1864) (Cetacea, Delphinidae), on the coast of Espírito Santo state, Brazil

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Essentially piscivorous, it feeds mainly on pelagic fish that form shoals, with a maximum length of 37 cm. Plagioscion squamosissimus is the species most consumed by S. fluviatilis in Central Amazon and also appears among the most consumed in the Amazonian Estuary (Beltrán-Pedreros & Pantoja, 2006;Rosas, Marigo, Laeta, & Rossi-Santos, 2010). In addition, Borobia and Barros (1989) mentioned fish of the genus Pellona among the species predated by the tucuxi.…”

Section: Discussionmentioning

confidence: 99%

Detection of Anisakidae larvae parasitizing Plagioscion squamosissimus and Pellona castelnaeana in the State of Pará, Brazil

Rabelo

Silva

Araujo

et al. 2017

Acta Sci. Biol. Sci.

View full text Add to dashboard Cite

ABSTRACT. Five specimens of Plagioscion squamosissimus from Xingu River and ten specimens of Pellona castelnaeana from Mosqueiro Island, both in the State of Pará, Brazil, were examined to investigate the presence of anisakid nematodes, due to their zoonotic potential. Their parasitism indices and sites of infection were also determined. This is the first record of Anisakidae parasitizing Pellona castelnaeana. Fourhundred and eighty-four third-stage larvae (L 3 ) of Anisakidae were found, of which 42 were found in P. squamosissimus and 442 in P. castelnaeana. The parasitism indices of the anisakid collected from the P. squamosissimus comprised prevalence (P) of 100%, mean infection intensity (MI) of 8.4, range of infection (RI) of 1-13, mean abundance (MA) of 8.4, and infection site (IS) in the abdominal cavity. P. castelnaeana showed P = 100%, MI = 44.2, RI = 10-114, MA = 44.2, and IS = abdominal cavity, cecum and stomach. The life cycle of these nematodes can be completed in the Amazon basin, since the two hosts fish are part of the cetacean diet of the region, which participate as final hosts. These findings have an important consequence on epidemiology of anisakiasis, so attention should be extended to human protection against this public health risk.

show abstract

“…Indeed, the freshwater species, commonly known as tucuxi in Brazil, is classified as Sotalia fluviatilis , while the coastal marine species, the Guiana dolphin, distributed from Honduras (15°58′N) (Da Silva and Best ) to Santa Catarina (27°35′S) in southern Brazil (Simões‐Lopes ), is currently classified as Sotalia guianensis (Rosas et al . ).…”

mentioning

confidence: 97%

Whistle variability of Guiana dolphins in South America: Latitudinal variation or acoustic adaptation?

Moron

Lopes

Reis

et al. 2018

Marine Mammal Science

View full text Add to dashboard Cite

A previous comparison of whistles using data sampled at 48 kHz suggested that certain frequency parameters vary along a latitudinal gradient. This geographical pattern may be biased because whistles sampled at higher frequencies could potentially have very different frequency contents. The current study compared the acoustic parameters of Guiana dolphin (Sotalia guianensis) whistles recorded at a higher sampling rate (96 kHz) and from groups occupying two never before sampled sites, Benevente Bay, Espírito Santo, Brazil, and Formosa Bay, Rio Grande do Norte, Brazil, with recordings of other populations in South America. By only considering data sampled at a rate of at least 96 kHz, we aimed to detect differences in whistles across locations. Contrary to previous findings, our analyses do not indicate any clear separation between northern and southern populations based on whistles, and do not corroborate the hypothesis of latitudinal acoustic variation in this species. The variation in Guiana dolphin whistle parameters found here appears to be influenced by latitude to some extent, but several other factors, including sampling method, environmental fluctuations, and social influence on vocal learning, may be confounding the detection of a geographic pattern in these whistle samples.

show abstract

Natural history of dolphins of the genus Sotalia

Cited by 16 publications

References 26 publications

Variation of age and total length in Sotalia guianensis (Van Bénéden, 1864) (Cetacea, Delphinidae), on the coast of Espírito Santo state, Brazil

Variation of age and total length in Sotalia guianensis (Van Bénéden, 1864) (Cetacea, Delphinidae), on the coast of Espírito Santo state, Brazil

<b>Detection of Anisakidae larvae parasitizing <i>Plagioscion squamosissimus</i> and <i>Pellona castelnaeana</i> in the State of Pará, Brazil

Whistle variability of Guiana dolphins in South America: Latitudinal variation or acoustic adaptation?

Contact Info

Product

Resources

About