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Diurnal and tidal pattern influencing the behaviour of Sotalia guianensis on the north-eastern coast of Brazil

Published online by Cambridge University Press:  23 June 2009

F.R. Guilherme-Silveira  and
F.J.L. Silva
F.R. Guilherme-Silveira*
Affiliation:
Postgraduate Programme in Psychobiology, Department of Physiology, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
F.J.L. Silva
Affiliation:
Department of Biology Science, Universidade Estadual do Rio Grande do Norte, Mossoró, RN, Brazil
*
Correspondence should be addressed to: F.R. Guilherme-Silveira, Postgraduate Programme in Psychobiology, Department of Physiology, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil email: guilhermesilveira.fr@gmail.com
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Abstract

The present study demonstrates the influence of the time of the day and tide on the frequency of individuals and on the social and foraging behaviour of an equatorial population of Sotalia guianensis. A population of S. guianensis from enseada do Curral (6°13′00″S 35°3′36″W), north-eastern Brazil, was investigated from October 1999 to September 2003. Social and foraging activities oscillated significantly, being less intense at high tide in comparison to other analysed tides. Socialization was more intense between 1000 and 1300 hours and foraging was more intense in between tides, than at high tide. No diurnal or tidal fluctuation was found on the frequency of individuals, which remained constant throughout the day. These results demonstrate the influence of circadian factors on an equatorial population which is highly impacted by human activities and highlights a need for protective measures.

Keywords

Delphinidaeestuarine dolphinSotalia guianensisbehaviourdiurnalcircatidaltidalinletequatorialnorth-eastern
Type
Research Article
Information
Marine Biodiversity Records , Volume 2 , January 2009 , e122
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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References

REFERENCES

Alcock, J. (2001) Choosing where to live. In Alcock, J. (ed.) Animal behavior: an evolutionary approach. Sunderland, MA: Sinauer Associates, Inc., pp. 249–278.Google Scholar
Araújo, J.P.D., Passavante, J.Z.D.O. and Souto, A.D.S. (2001) Behavior of the estuarine dolphins, Sotalia guianensis, at Dolphin Bay - Pipa - Rio Grande do Norte - Brazil. Tropical Oceanography 29, 13–23.Google Scholar
Azevedo, A.F., Oliveira, A.M., Viana, S.C. and Sluys, M.V. (2007) Habitat use by marine tucuxis (Sotalia guianensis) (Cetacea: Delphinidae) in Guanabara Bay, south-eastern Brazil. Journal of the Marine Biological Association of the United Kingdom 87, 201–205.Google Scholar
Borobia, M. and Barros, N.B. (1989) Notes on the diet of marine Sotalia fluviatilis. Marine Mammal Science 5, 395–399.Google Scholar
Connor, R.C., Wells, R., Mann, J. and Read, J. (2000) The bottlenose dolphin. In Mann, J. et al. (eds) Cetacean societies: field studies of dolphins and whales. Chicago: University of Chicago Press, pp. 91–126.Google Scholar
Embratur – Anuário Statístico Embratur (2006) [On-line.] Homepage: http://institucional.turismo.gov.br/Google Scholar
Estes, J.A., Ronald, J. and Rhode, E.B. (1982) Activity and prey election in the sea otter influence of population status on community structure. American Naturalist 120, 242–258.CrossRefGoogle Scholar
Garcia, C. and Trujillo, F. (2004) Preliminary observations on habitat use patterns of the marine Tucuxi, Sotalia fluviatilis, in Cispatá Bay, Colombian coast. Lajam 3, 53–59.CrossRefGoogle Scholar
Geise, L., Gomes, N. and Cerqueira, R. (1999) Behaviour, habitat use and population size of Sotalia fluviatilis (Gervais, 1853) (Cetacea, Delphinidae) in the Cananeia estuary region, São Paulo, Brazil. Revista Brasileira de Biologia 59, 183–194.Google Scholar
Guilherme-Silveira, F.R. and Silva, F.J.L. (2007) Behavioural seasonality of the estuarine dolphin, Sotalia guianensis, on the north-eastern Brazilian coast. JMBA2 Biodiversity Records. Published on-line. http://www.mba.ac.uk/jmba/jmba2biodiversityrecords.php?5662Google Scholar
Hayes, A.J.S. (1998) Aspectos da actividade comportamental diurna da forma marinha do tucuxi, Sotalia fluviatilis, Gervais, 1853 (Cetacea - delphinidae), na Praia de Iracema (Fortaleza - Ceará - Brasil). Relatório de licenciatura em Biologia Marinha e Pesca. Universidade de Algarve, Faro, 52 p.Google Scholar
Instituto Brasileiro de Meio Ambiente e Recursos Renováveis (1997) Relação das Espécies sob Maior Presão Antrópica. In Mamíferos Aquáticos do Brasil: Plano de Ação II. (Ed) Instituto Brasileiro de Meio Ambiente e Recursos Renováveis, Brasilia, Edições IBAMA, pp. 25–27.Google Scholar
Karczmarski, L., Thornton, M. and Cockcroft, V.G. (2000) Daylight occurrence of humpback dolphins, Sousa chinensis, in Algoa Bay, South Africa. African Journal of Ecology 38, 86–90.CrossRefGoogle Scholar
Krebs, J.R. and Davis, N.B. (1996) Decisão econômica e o indivíduo. In Krebs, J.R. and Davis, N.B. (eds) Introdução à Ecologia Comportamental. São Paulo: Atheneu Editora São Paulo, pp. 48–76.Google Scholar
Lodi, L. (2003) Tamanho e composição de grupo dos Botos-cinza, Sotalia guianensis (van Bénéden, 1864) (Cetacea, Delphinidae), na Baia de Paraty, Rio de Janeiro, Brasil. Atlântica 25, 135–146.Google Scholar
Mann, J. (1999) Behavioral sampling methods for cetaceans: a review and critique. Marine Mammal Science 15, 102–122.Google Scholar
Monteiro, M.S., Souto, A. and Nascimento, L.F.D. (2006) Comparações entre os comportamentos de forrageio nas diferentes faixas etárias do Boto-cinza (Sotalia guianensis) (Cetacea; delphinidae) na Baia dos Golfinhos, Praia de Pipa, RN, Brasil. Revista de Etologia 8, 13–25.Google Scholar
Monteiro-Filho, E.L.A. (1995) Pesca interativa entre o golfinho, Sotalia fluviatilis e a comunidade pesqueira da região de Cananéia. B. Inst. Pesca 22, 15–23.Google Scholar
Neumann, D.R. (2001) The activity budget of free-ranging common dolphin (Delphinus delphis) in the northwestern Bay of Plenty, New Zealand. Aquatic Mammals 27, 121–136.Google Scholar
Norris, K.S., Würsig, B. and Wells, R.S. (1994) Aerial behavior. In Norris, K.S. et al. (eds) The Hawaiian spinner dolphin. Berkeley: University of California Press, pp. 103–120.CrossRefGoogle Scholar
Oliveira, J.A., Ávila, J.C., Alves, T.T. Jr, Furtado-Neto, M.A. and Monteiro-Neto, C. (1995) Monitoring of the grey dolphin, Sotalia fluviatilis (Cetacea: Delphinidae), off Fortaleza, Ceará State, Brazil. Arquivos de Ciências do Mar 29, 28–35.Google Scholar
Saayman, G.S., Tayler, C.K. and Bower, D. (1972) Diurnal activity cycles in captive and free-ranging Indian Ocean bottlenose dolphins (Tursiops aduncus ehrenburg). Behaviour 44, 212–233.Google Scholar
Santos, M.C.D.O., Acunã, L.B. and Rosso, S. (2001) Insights on site fidelity and calving intervals of the marine tucuxi dolphin (Sotalia fluviatilis) in south-eastern Brazil. Journal of the Marine Biological Association of the United Kingdom 81, 1049–1052.CrossRefGoogle Scholar
da Silva, V.M.F. and Best, R.C. (1996) Sotalia fluviatilis. Mammalian Species 527, 1–7.Google Scholar
Simão, S.M. and Poletto, F.R. (2002) Áreas preferenciais de pesca e dieta do ecótipo marinho do Boto-cinza (Sotalia fluviatilis) na Baia de Sepetiba, RJ. Floresta e Ambiente 9, 18–25.Google Scholar
Simões-Lopes, P.C. and Paula, G.S. (1997) Mamíferos aquáticos e impacto humano: diretrizes para consevação e “utilização não letal”. Aquitaine Ocean 3, 69–78.Google Scholar
Torres, D. and Beasley, C.R. (2003) Pattern of use of a small bay in northern Brazil by Sotalia guianensis (Cetacea: Delphinidae). Amazoniana 17, 583–594.Google Scholar
Tosi, C.H. and Ferreira, R.G. (2008) Behavior of estuarine dolphins Sotalia guianensis (Cetácea, Delphinidae), in controlled boat traffic situation at southern coast of Rio Grande do Norte, Brazil. Biodiversity and Conservation. DOI: 10.1007/s10531-008-9435-z.CrossRefGoogle Scholar
Watkins, W.A. (1986) Whale reactions to human activities in Cape Cod waters. Marine Mammal Science 2, 251–262.CrossRefGoogle Scholar
Wedekin, L.L., Daura-Jorge, F.G., Piacentini, V.Q. and Simões-Lopes, P.C. (2007) Seasonal variations on the spatial usage of estuarine dolphin, Sotalia guianensis (Cetacea, Delphinidae) at its southern limit of distribution. Brazilian Journal of Biology 67, 1–8.Google Scholar
Well, R.S., Irvine, A.B. and Scott, M.D. (1980) The social ecology of inshore odontocetes. In Herman, L.M. (ed.) Cetacean behavior: mechanisms and functions. Malabar: Krieger Publishing Company, pp. 263–317.Google Scholar
Wilson, B., Thompson, P.M. and Hammond, P.S. (1997) Habitat use by bottlenose dolphins: seasonal distribution and stratified movement patterns in the Moray Firth, Scotland. Journal of Applied Ecology 34, 1365–1374.Google Scholar