Results 21 to 30 of about 1,287 (160)

Reproductive morphology of female Guiana dolphins (Sotalia guianensis) [PDF]

Anais da Academia Brasileira de Ciências, 2015
The reproductive morphology of cetaceans is poorly studied and, despite the large number of strandings, reports on this subject are scarce due to access to carcasses mostly in an advanced state of decomposition.
ESTELLA Z. BECEGATO, JANAINA P. ANDRADE, JULIANA P. GUIMARÃES, JOCIERY E. VERGARA-PARENTE, MARIA ANGELICA MIGLINO, FERNANDA M. DE OLIVEIRA E SILVA   +5 more
doaj   +4 more sources

Population Structure of Riverine and Coastal Dolphins Sotalia fluviatilis and Sotalia guianensis: Patterns of Nuclear and Mitochondrial Diversity and Implications for Conservation

Journal of Heredity, 2018
Coastal and freshwater cetaceans are particularly vulnerable due to their proximity to human activity, localized distributions, and small home ranges. These species include Sotalia guianensis, found in the Atlantic and Caribbean coastal areas of central and South America, and Sotalia fluviatilis, distributed in the Amazon River and tributaries.
Susana, Caballero, Claudia, Hollatz, Sebastián, Rodríguez, Fernando, Trujillo, C Scott, Baker   +4 more
openaire   +3 more sources

Feeding habits of Sotalia fluviatilis in the Amazonian Estuary = Hábitos alimentares de Sotalia fluviatilis no estuário amazônico

Acta Scientiarum: Biological Sciences, 2006
In this paper we present an analysis of the fifty S. fluviatilis feeding habits in the Amazonian Estuary. Animals were bycaught by the artisanal fishing fleet between 1996 and 2001.
Sandra Beltrán-Pedreros, Tatyanna Mariucha de Araújo Pantoja   +1 more
doaj   +1 more source

Riverine and marine ecotypes of Sotalia dolphins are different species

Marine Biology, 2005
The current taxonomic status of Sotalia species is uncertain. The genus once comprised five species, but in the twentieth century they were grouped into two (riverine Sotalia fluviatilis and marine Sotalia guianensis) that later were further lumped into a single species (S. fluviatilis), with marine and riverine ecotypes.
Cunha, Haydée A., Silva, Vera Maria Ferreira da, Lailson-Brito, José, Santos, Marcos César de Oliveira, Flores, Paulo A.C., Martin, Anthony Richard, Azevedo, Alexandre de Freitas, Fragoso, Ana Bernadete Lima, Zanelatto, Regina Célia, Solé-Cava, António Mateo   +9 more
openaire   +3 more sources

Alterações comportamentais do golfinho Sotalia guianensis (Gervais, 1953) provocadas por embarcações [PDF]

Biotemas, 2006
Foram medidas as respostas comportamentais dos golfinhos Sotalia guianensis na presença de embarcações de turismo na enseada do Curral, Pipa-RN, Brasil.
Anderson Luis do Valle, Francielli Cristine Cunha Melo   +1 more
doaj   +1 more source

Electroreception in the Guiana dolphin (Sotalia guianensis) [PDF]

Proceedings of the Royal Society B: Biological Sciences, 2011
Passive electroreception is a widespread sense in fishes and amphibians, but in mammals this sensory ability has previously only been shown in monotremes. While the electroreceptors in fish and amphibians evolved from mechanosensory lateral line organs, those of monotremes are based on cutaneous glands innervated by trigeminal nerves.
Nicole U, Czech-Damal, Alexander, Liebschner, Lars, Miersch, Gertrud, Klauer, Frederike D, Hanke, Christopher, Marshall, Guido, Dehnhardt, Wolf, Hanke   +7 more
openaire   +2 more sources

High-frequency social communication in Sotalia guianensis [PDF]

The Journal of the Acoustical Society of America, 2019
This study aimed to investigate the use of high ultrasonic frequencies (above 40 kHz) in the Sotalia guianensis whistle repertoire. The whistles were classified as high-frequency (HF) whistles and very high-frequency (VHF) whistles. Seven parameters were extracted and a general linear mixed effects model was performed between the total number of ...
Mariana, Barbosa, Lis, Bittencourt, Luciana, G Andrade, Tatiana, L Bisi, José, Lailson-Brito, Alexandre, F Azevedo   +5 more
openaire   +2 more sources

Crescimento e desenvolvimento de boto-cinza (Sotalia guianensis) do litoral do Espírito Santo

Arquivo Brasileiro de Medicina Veterinária e Zootecnia, 2012
Estudou-se o desenvolvimento do boto-cinza (Sotalia guianensis) do litoral do Espírito Santo e verificou-se se a análise das radiografias da aleta peitoral pode ser utilizada para tal.
A.P.M. Carvalho, J. Ywasaki, C.T. Azevedo, A.S. Campos, F.F. Queiroz, L.A.E. Pontes, L.A. Barbosa, L.S. Silveira   +7 more
doaj   +1 more source

Feeding Strategies of the Guiana Dolphin Sotalia guianensis [PDF]

The Open Marine Biology Journal, 2009
The aim of this study was to characterize the feeding behavior of the Guiana dolphin, S. guianensis, through description and quantification of the strategies used by the dolphins, and possibly to apply this patterns to other areas in its distribution. Data were collected during systematic boat surveys, between November/1996 and May/1997, with 120 hours
Marcos R. Rossi-Santos, Paulo A.C. Flores   +1 more
openaire   +1 more source

Aspectos histológicos do trato digestivo de Sotalia fluviatilis (Cetacea, Delphinidae): esôfago e estômago [PDF]

, 1988
Os esôfagos e estômagos de seis botos tucuxi, Sotalia fluviatilis (Cetacea: Delphinidae) foram examinados anatômica e microscopicamente e comparados com os de botos marinhos do mesmo gênero.
Silva, Vera Maria Ferreira da, Chaves,Paulo de Tarso da C., Chaves, Paulo de Tarso da C, da Silva,Vera M. Ferreira   +3 more
core   +1 more source