Instituto Boto Cinza Guiana dolphin distribution between 2005-2007 in Sepetiba Bay, Brazil

Projeto Boto Cinza

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.

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.

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Overview

This section explains attributes included in the original dataset. OBIS-SEAMAP restricts the attributes available to the public to date/time, lat/lon and species names/counts only. Should you need other attributes described here, you are encouraged to contact the data provider.

Attributes described below represent those in the original dataset provided by the provider.
Only minimum required attributes are visible and downloadable online. Other attributes may be obtained upon provider's permission.

Attributes in dataset

Attribute (table column)	Description
oid	Unique ID number (generated by SEAMAP)
survey	Survey code
obs_date	Observed date
obs_time	Obaserved time
latitude	Latitude of observation
longitude	Longitude of observation
obs_count	Observed count
sp_obs	Species observed
sp_tsn	Species ITIS TSN