https://doi.org/10.82144/08941328 https://seamap.env.duke.edu/dataset/717 https://www.gbif.org/dataset/bcedd9b9-eebf-4b5d-881b-0abf4dfdc420 https://obis.org/dataset/f55166a1-b1bc-4ea4-9b9d-21737fe47169 Leonardo Flach Projeto Boto Cinza, Instituto Boto Cinza Primary contact flachleo@hotmail.com http://www.projetobotocinza.com.br OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu distributor Leonardo Flach Projeto Boto Cinza, Instituto Boto Cinza Primary contact flachleo@hotmail.com http://www.projetobotocinza.com.br owner 2025-07-31 eng Original provider: Projeto Boto Cinza Dataset credits: Projeto Boto Cinza Abstract: Between August 2005 and July 2007, 376 Guiana dolphin (<i>Sotalia guianensis</i>) 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. Occurrence GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml Observation GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml Marine Biology Visual sighting N/A This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License. https://seamap.env.duke.edu/dataset/717 Oceans -44.03383 -43.71282 -22.93245 -23.05865 2005-08-11 2007-07-30 Scientific names are based on the Integrated Taxonomic Information System (ITIS). species Sotalia guianensis 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. notPlanned Leonardo Flach Projeto Boto Cinza, Instituto Boto Cinza Primary contact flachleo@hotmail.com http://www.projetobotocinza.com.br NA NA NA Leonardo Flach owner NA zd_717 2025-07-31T15:32:50-04:00 dataset Flach, L. 2011. Instituto Boto Cinza Guiana dolphin distribution between 2005-2007 in Sepetiba Bay, Brazil. Version 1.0.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/08941328. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/717 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/717/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/717/eml OBIS-SEAMAP zd_717 zd_717 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.