IMIS | Flanders Marine Institute

Flanders Marine Institute

Platform for marine research


Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ] Printer-friendly version

Instituto Boto Cinza Guiana dolphin distribution between 2005-2007 in Sepetiba Bay, Brazil
Dias, L.A., D. Herzing, and L. Flach. 2009. Aggregations of Guiana dolphins (Sotalia guianensis) in Sepetiba Bay, Rio de Janeiro, south-eastern Brazil: Distribution patterns and ecological characteristics. Journal of the Marine Biological Association of the United Kingdom. 89: 967-973

Access data
Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

The objective of this study was to investigate the occurrence of Guiana dolphin aggregations regarding their seasonal, diel and spatial distributions; behavioral activities, age composition and the environmental parameters measured during their occurrence in Sepetiba Bay. more

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 behavior but not necessarily moving in the same direction. Guiana dolphin groups and aggregations differed significantly in behavioral 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 global positioning system (GPS) records of aggregations formed two distinct clusters of distribution within the bay, indicating potential areas where conservation strategies could be implemented. Dataset credit : Projeto Boto Cinza, a project from the Instituto Boto Cinza

Biology > Mammals
Marine, ASW, Brazil, Rio de Janeiro, Sepetiba Bay, Sotalia guianensis (Van Beneden, 1864)

Geographical coverage
ASW, Brazil, Rio de Janeiro, Sepetiba Bay [Marine Regions]

Temporal coverage
11 August 2005 - 30 July 2007

Taxonomic coverage
Sotalia guianensis (Van Beneden, 1864) [WoRMS]

Instituto Boto Cinza, moredata owner

Related datasets
Published in:
OBIS-SEAMAP: Spatial Ecological Analysis of Megavertebrate Populations, more

Based on this dataset:
Dias, L.A. et al. (2009). Aggregations of Guiana dolphins (Sotalia guianensis) in Sepetiba Bay, Rio de Janeiro, south-eastern Brazil: distribution patterns and ecological characteristics. J. Mar. Biol. Ass. U.K. 89(Special Issue 05): 967-973., more


Dataset information:

Dataset status: Completed
Data type: Data
Data origin: Monitoring: field survey
Metadatarecord created: 2012-11-22
Information last updated: 2012-11-22
All data in IMIS is subject to the VLIZ privacy policy