scholarly journals Habitat use of the Guiana dolphin, Sotalia guianensis (Cetacea, Delphinidae), in the Caravelas River Estuary, eastern Brazil

2010 ◽  
Vol 8 (1-2) ◽  
Author(s):  
M. R. Rossi-Santos ◽  
L. L. Wedekin ◽  
E. L. A. Monteiro-Filho
Keyword(s):  
Habitat Use ◽  
River Estuary ◽  
Sotalia Guianensis ◽  
Eastern Brazil ◽  
Guiana Dolphin

Aggregations of Guiana dolphins (Sotalia guianensis) in Sepetiba Bay, Rio de Janeiro, south-eastern Brazil: distribution patterns and ecological characteristics

2009 ◽  
Vol 89 (5) ◽  
pp. 967-973 ◽  
Author(s):  
Laura Aichinger Dias ◽  
Denize Herzing ◽  
Leonardo Flach
Keyword(s):  
Temporal Distribution ◽  
Distribution Patterns ◽  
Conservation Strategies ◽  
Temporal Association ◽  
Sepetiba Bay ◽  
Sotalia Guianensis ◽  
Behavioural Activity ◽  
Eastern Brazil ◽  
Feeding Activities ◽  
Guiana Dolphin

Between August 2005 and July 2007, 376 Guiana dolphin (Sotalia guianensis) encounters were documented in Sepetiba Bay. For the purpose of this study all dolphin sightings were classified as groups or aggregations. Groups (N = 268, x = 20, range = 1–90) consisted of dolphins in apparent association usually engaged in the same behaviour and moving in the same direction. Aggregations (N = 108, x = 204, range = 100–450) consisted of temporal association of numerous groups gathered in an area, totalling several hundred individuals usually engaged in the same behaviour but not necessarily moving in the same direction. Guiana dolphin groups and aggregations differed significantly in behavioural activity, spatial and temporal distribution and age composition. Most aggregated dolphins were engaged in foraging/feeding activities and primarily located at the interior of the bay, and also, aggregations were more likely recorded during morning hours and had more neonates and calves present when compared to groups. The plotted GPS records of aggregations formed two distinct clusters of distribution within the bay, indicating potential areas where conservation strategies could be implemented.

Individual identification and habitat use of the estuarine dolphin Sotalia guianensis (Cetacea: Delphinidae) in Cananéia, south-eastern Brazil, using video images

2008 ◽  
Vol 88 (6) ◽  
pp. 1199-1205 ◽  
Author(s):  
L.V. de Oliveira ◽  
E.L.A. Monteiro-Filho
Keyword(s):  
Habitat Use ◽  
Individual Identification ◽  
Dorsal Region ◽  
Extensive Area ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Dorsal Fin ◽  
Video Images ◽  
Eastern Brazil ◽  
Estuarine Dolphin

Individual identification using Hi8 video images was tested on the population of estuarine dolphins, Sotalia guianensis that inhabit the Cananéia estuary, south-eastern Brazil. Between June 2001 and August 2002, 25 different dolphins were identified by nicks on the dorsal fin (80%) and by the association of cuts and scratches on the dorsal fin and the body's dorsal region (20%). The existent marks were used to create an identification key to ease the matching between dolphins. The animals were present on 100% of the sampled days, and some of them were repeatedly registered at the same sector in the area, suggesting that although they occupy an extensive area, they use it in an intended way. When compared to researches that used photographs to identify cetaceans, the video images showed some loss of information, nevertheless the analysis could be done without impairment of results, therefore this method proved to be efficient.

Guiana Dolphin (Sotalia guianensis) in the southern Gulf of Venezuela: Seasonal distribution, group size, and habitat use

2019 ◽  
Vol 32 ◽  
pp. 100874 ◽  
Author(s):  
Nínive Espinoza-Rodríguez ◽  
Kareen De Turris-Morales ◽  
Takahiro Shimada ◽  
Héctor Barrios-Garrido
Keyword(s):  
Habitat Use ◽  
Group Size ◽  
Seasonal Distribution ◽  
Sotalia Guianensis ◽  
Guiana Dolphin

Habitat use by the Guiana dolphin (Sotalia guianensis) (Cetartiodactyla: Delphinidae) in southeastern Brazil

2021 ◽  
Vol 44 ◽  
pp. 101778
Author(s):  
Ana Ribeiro-Campos ◽  
Karina S. Pereira ◽  
Carlos Eduardo P. Quintana ◽  
Mariana Barbosa ◽  
Carolina P. Dias ◽  
...  
Keyword(s):  
Habitat Use ◽  
Southeastern Brazil ◽  
Sotalia Guianensis ◽  
Guiana Dolphin

Habitat use by marine tucuxis (Sotalia guianensis) (Cetacea: Delphinidae) in Guanabara Bay, south-eastern Brazil

2007 ◽  
Vol 87 (1) ◽  
pp. 201-205 ◽  
Author(s):  
Alexandre F. Azevedo ◽  
Alvaro M. Oliveira ◽  
Simone C. Viana ◽  
Monique Van Sluys
Keyword(s):  
Habitat Use ◽  
Habitat Degradation ◽  
Guanabara Bay ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
The North ◽  
Eastern Brazil ◽  
North Eastern ◽  
Kolmogorov Smirnov ◽  
South Axis

Data on habitat use by marine tucuxis (Sotalia guianensis) were collected in Guanabara Bay (GB), south-eastern Brazil, over a two-year period. Diurnal activities of marine tucuxis were dominated by behaviour related to feeding/foraging (58% of all recorded time). Dolphins spent more time in feeding/foraging activities in the morning with a secondary peak in late afternoon. Dolphins were seen in waters of 2 to 35 m (11.63±6.05; median=12.0). Depths used by S. guianensis groups significantly differed from depths available in GB (Kolmogorov–Smirnov test; Z=5.72; P<0.001). Most groups (69.8%) were sighted in depths between 5.1 and 15.0 m. Dolphins occupied an area of 136.9 km2, which represents about 42% of the entire water surface of GB. Individuals selected areas within GB and avoided the most degraded ones, which suggests that habitat degradation may affect S. guianensis distribution. Diurnal distances travelled by individuals ranged from 3.3 to 27.2 km in a same day. Dolphins found in main channel and adjacent waters moved along the north–south axis of GB throughout the day and covered distances three times greater than dolphins which concentrated their activities in north-eastern areas.

Rostrum Contact Behaviors by the Guiana Dolphin (Sotalia guianensis) in Ilhéus, Brazil

2016 ◽  
Vol 42 (2) ◽  
pp. 203-209
Author(s):  
Flavia B. Izidoro ◽  
Yvonnick Le Pendu
Keyword(s):  
Sotalia Guianensis ◽  
Guiana Dolphin

Stomach contents of the marine tucuxi dolphin (Sotalia guianensis) from Rio de Janeiro, south-eastern Brazil

2007 ◽  
Vol 87 (1) ◽  
pp. 253-254 ◽  
Author(s):  
Ana Paula Madeira Di Beneditto ◽  
Salvatore Siciliano
Keyword(s):  
Rio De Janeiro ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Additional Information ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Eastern Brazil ◽  
Trichiurus Lepturus ◽  
Cynoscion Guatucupa ◽  
Janeiro State

Along the central coast of Rio de Janeiro State (22°25′S–23°00′S), south-eastern Brazil, the marine tucuxi dolphin (Sotalia guianensis) feeds on neritic prey that are distributed through the water column and are abundant all year round. The most frequently found species were the teleost fish Trichiurus lepturus, Cynoscion guatucupa, Isopisthus parvipinnis and Porichthys porossisimus. Fish species were more important than cephalopod species in the diet of the marine tucuxi. Back calculations of prey sizes indicated that they feed mainly on young specimens. The present study provided additional information on the feeding habits of the marine tucuxi dolphin.

scholarly journals Feeding Strategies of the Guiana Dolphin Sotalia guianensis

2009 ◽  
Vol 3 (1) ◽  
pp. 70-76 ◽  
Author(s):  
Marcos R. Rossi-Santos ◽  
Paulo A.C. Flores
Keyword(s):  
Feeding Strategies ◽  
Sotalia Guianensis ◽  
Guiana Dolphin

scholarly journals Quem são e o que pensam os condutores de embarcações turísticas para observação de botos-cinza?

2018 ◽  
Vol 11 (4) ◽  
Author(s):  
Josivânia Emanuelly Azevedo Dos Santos ◽  
Vitor de Oliveira Lunardi ◽  
Diana Carvalho de Freitas ◽  
Maria Mayara dos Santos Silva ◽  
Diana Gonçalves Lunardi
Keyword(s):  
Cultural Awareness ◽  
Environmental Planning ◽  
Codes Of Conduct ◽  
Rio Grande ◽  
The Sustainable Development ◽  
Sotalia Guianensis ◽  
Relevant Role ◽  
Social Environmental ◽  
Guiana Dolphin ◽  
Dolphin Watching

Condutores turísticos podem exercer um papel relevante para o desenvolvimento sustentável do ecoturismo, sendo responsáveis pela condução dos turistas durante a visitação, promoção da sensibilização ambiental e cultural e contribuição no monitoramento de impactos socioambientais no local de visitação. Este estudo teve como objetivo descrever quem são e o que pensam os condutores de embarcações turísticas para observação de botos-cinza (Sotalia guianensis). Para tanto, foi registrada a interação entre condutores turísticos e turistas durante 22 passeios de observação de botos-cinza realizados entre 2014 e 2018 na Reserva de Fauna Costeira de Tibau do Sul (REFAUTS), Rio Grande do Norte, Brasil. Adicionalmente, 22 questionários foram aplicados aos condutores de embarcações turísticas na REFAUTS, em maio de 2017 e julho de 2018. Durante os 22 passeios monitorados, os turistas não receberam qualquer informação sobre a REFAUTS ou receberam informação insuficiente sobre a biologia e ecologia de botos-cinza. De acordo com as respostas obtidas nos questionários, condutores turísticos da REFAUTS são predominantemente jovens, com nível de escolaridade fundamental e têm esta atividade como principal fonte de renda. Estes condutores declararam trabalhar na REFAUTS há pelo menos sete anos e ter conhecimento insuficiente sobre a existência desta Reserva. Uma parte significativa destes profissionais também declarou desconhecer a Lei Municipal nº 349/2007, que regulamenta o transporte marítimo na REFAUTS. Contudo, estes condutores declararam reconhecer a importância dos seguintes aspectos ambientais para a REFAUTS: boto-cinza, ambiente marinho protegido, normas de conduta, programa de fiscalização e cobrança da taxa turística para a REFAUTS. Os resultados deste estudo poderão subsidiar programas de educação ambiental voltados para os condutores turísticos, tornando-os importantes aliados na conservação de botos-cinza e agentes multiplicadores no processo de sensibilização ambiental de turistas na REFAUTS. Who are and what think the guiana dolphin-watching operators? Tour operators can play a relevant role in the sustainable development of ecotourism, being responsible for driving tourists during the visitation, promoting environmental and cultural awareness and contributing to the monitoring of social-environmental impacts in the place of visitation. This study aimed to describe who are and what think the Guiana dolphin-watching operators. We recorded the interaction between dolphin-watching operators and tourists during 22 tours conducted between 2014 and 2018 in the Coastal Wildlife Reserve of Tibau do Sul (REFAUTS), Rio Grande do Norte State, Brazil. In addition, 22 questionnaires were applied to dolphin-watching operators at the REFAUTS in May 2017 and July 2018. During the 22 tours monitored, tourists did not receive any information about the REFAUTS or received insufficient information about the biology and ecology of Guiana dophin (Sotalia guianensis). According to the answers obtained in the questionnaires, dolphin-watching operators are predominantly young, with elementary scholarly and have this activity as the main source of income. These dolphin-watching operators reported that they have worked in the REFAUTS for at least seven years and that they have insufficient knowledge about the existence of this Reserve. A significant number of these professionals also reported that they do not know the Municipal Law no 349/2007, which regulates maritime transport at the REFAUTS. However, these dolphin-watching operators reported that they recognize the importance of the following environmental aspects for the REFAUTS: Guiana dolphin, protected marine area, codes of conduct, inspection program and tourist tax for the REFAUTS. The results of this study may subsidize environmental education programs for dolphin-watching operators, making them important partners in the conservation of Guiana dolphin and multipliers in the process of environmental awareness of tourists in the REFAUTS. KEYWORDS: Dolphin; Environmental Perception; Environmental Planning; Pipa Beach; Dolphin-Watching.

Sign in / Sign up

Export Citation Format

Share Document