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

Dataset credit

Projeto Boto Cinza

Contacts

RoleNameOrganization 
Primary contact Leonardo Flach Projeto Boto Cinza, Instituto Boto Cinza
Data entry Connie Kot Duke University

Citation

Abstract

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.

Purpose

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.

Supplemental information

N/A

References

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.

Attributes

Overview

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

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 in dataset provided

Attribute (table column)Description
oidUnique ID number (generated by SEAMAP)
surveySurvey code
obs_dateObserved date
obs_timeObaserved time
latitudeLatitude of observation
longitudeLongitude of observation
obs_countObserved count
sp_obsSpecies observed
sp_tsnSpecies ITIS TSN
OBIS-SEAMAP ID717
Seabirds0
Marine mammals372
Sea turtles0
Rays and sharks0
Other species0
Non spatial0
Non species0
Total372
Date, Begin2005-08-11
Date, End2007-07-30
Temporal prec.111111
Latitude-23.06 - -22.93
Longitude-44.03 - -43.71
Coord. prec.6 decimal digits
PlatformBoat
Data typeAnimal sighting
EffortN/A
Registered2011-02-17
Updated2011-02-17
StatusPublished
Sharing policy CC-BY-NC (Minimum)
Also availalbe from iOBIS
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