Dolphins
Mostrando 13-24 de 54 artigos, teses e dissertações.
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13. Coordinated feeding tactics of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in Ilha Grande Bay, Rio de Janeiro, Brazil
Differences in distribution, prey species, season and social learning opportunities influence the feeding tactics used by marine mammals. Here, we analyze the coordinated feeding behavior of the Guiana dolphin, Sotalia guianensis (Van Bénéden, 1864, Delphinidae) and its relation to seasonality and the presence of calves. In a total of 201 feeding bouts, we
Zoologia (Curitiba). Publicado em: 2011-06
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14. Abundance of bottlenose dolphins, Tursiops truncatus (Cetacea: Delphinidae), inhabiting the Patos Lagoon estuary, southern Brazil: implications for conservation
A new mark-recapture abundance estimate and a photographic census were carried out to investigate the possible decline in the abundance of the bottlenose dolphins, Tursiops truncatus (Montagu, 1821), in the Patos Lagoon estuary due to the high levels of bycatch mortality which occurred between 2002 and 2006 in oceanic coastal areas close to the estuary. Four
Zoologia (Curitiba). Publicado em: 2011-02
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15. Fine-scale habitat selection of chilean dolphins (Cephalorhynchus eutropia) : interactions with aquaculture activities in southern Chiloé Island, Chile
Fine-scale habitat selection of Chilean dolphins was studied between January and April 2002 through shorebased theodolite tracking in order to investigate the environmental and behavioural determinants of habitat use, and to evaluate the interactions between this species and aquaculture activities in Yaldad Bay, southern Chile. During 293.5 h of effort, move
Publicado em: 2011
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16. Habitat use patterns of franciscana dolphins (Pontoporia blainvillei) off southern Brazil in relation to water depth
The patterns of habitat use by the franciscana dolphins (Pontoporia blainvillei) along its distribution are poorly known. This study investigates the patterns of habitat use with respect to depth for 181 individuals of different age, size, gender and reproductive condition off Rio Grande do Sul, southern Brazil. The results reveal that franciscanas are very
Publicado em: 2011
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17. Guiana dolphins, Sotalia guianensis (Cetacea: Delphinidae), in the Paranaguá Estuarine Complex: insights on the use of area based on the photo-identification technique
The aim of the present study was to provide a preliminary description of habitat use by Guiana dolphins, Sotalia guianensis (Van Bénéden, 1864) in the Paranaguá Estuarine Complex (PEC), state of Paraná, Brazil. Approximately 124 km² were surveyed by small boat from April 2006 to July 2008 in the following subsets of the PEC: Canal do Superagui (~28 km²
Zoologia (Curitiba). Publicado em: 2010-06
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18. Guiana dolphins (Sotalia guianensis) displaying beach hunting behavior in the Cananéia Estuary, Brazil: social context and conservation issues
Com o intuito de detalhar o comportamento de procura e captura de alimento em praias (“beach hunting”) exibido por botos-cinza (Sotalia guianensis) no Estuário de Cananéia (EC) (25ºS, 48ºW), um estudo baseado na aplicação da técnica de foto-identificação foi conduzido de maio de 2000 a julho de 2003. Três plataformas de observação a foram esc
Brazilian Journal of Oceanography. Publicado em: 2010-06
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19. DISTRIBUIÇÃO E ESTIMATIVAS POPULACIONAIS DO BOTO Inia geoffrensis (DE BLAINVILLE, 1817) (INIIDAE) NO MÉDIO RIO ARAGUAIA (BRASIL CENTRAL)
This is the first study about the abundance and density of the boto Inia geoffrensis using Distance sampling in the Araguaia River (Central Brazil). The study was carried out along a 530 km section of the Middle Araguaia River. The surveys were conducted in May and September 2009 (during falling and dry water seasons), where strip and line transects were emp
Publicado em: 2010
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20. Parasitos metazoários de cetáceos da costa nordeste do Brasil. / Metazoan parasites of cetaceans of the northeast coast of Brazil.
Cetaceans are parasitized by a wide diversity of endo and ectoparasites in various tissues, organs and cavities. Some species are related to causes of strandings and mortality of dolphins and whales. In addition to knowledge about the pathological effects of these organisms, their importance in ecological and evolutionary studies is highlighted. The parasiti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/12/2009
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21. Estimates of DNA strand breakage in bottlenose dolphin (Tursiops truncatus) leukocytes measured with the Comet and DNA diffusion assays
The analysis of DNA damage by mean of Comet or single cell gel electrophoresis (SCGE) assay has been commonly used to assess genotoxic impact in aquatic animals being able to detect exposure to low concentrations of contaminants in a wide range of species. The aims of this work were 1) to evaluate the usefulness of the Comet to detect DNA strand breakage in
Genetics and Molecular Biology. Publicado em: 06/03/2009
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22. Sightings of franciscana dolphins (pontoporia blainvillei): the discovery of a population in the Paranaguá estuarine complex, Southern Brazil
Brazilian Journal of Oceanography. Publicado em: 2009-03
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23. Ocorrência e Interações de Recém-nascidos e Filhotes de golfinho-rotador Stenella longirostris na Baía dos Golfinhos, Fernando de Noronha
Studies indicate that spinner dolphins use the Baía dos Golfinhos, in Fernando de Noronha Archipelago, for resting, reproduction, parental care and protection against shark attacks. The present study had the purpose of verifying the seasonality of spinner dolphin newborns and calves in relation to the months of the year and the pluviometric seasons (dry and
Publicado em: 2009
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24. Interação com a pesca: implicações na conservação da toninha, Pontoporia blainvillei (Cetacea, Pontoporiidae) no litoral do estado de São Paulo, SP / Fisheries interactions: implications on the conservation of franciscana, Pontoporia blainvillei (Cetacea, Pontoporiidae) in the coastal area of São Paulo state
The scope of this study is to investigate the interactions of gillnet fishing and the accidental captures of the Pontoporia blainvillei, as well as the implications of this activity in species conservation. Therefore, fishing activities are described and analyzed, accidental captures are evaluated, mortality is estimated and some aspects of population struct
Publicado em: 2009