IFREMER/Kélonia satellite tracked late juvenile loggerhead sea turtles from Réunion Island 2008-2012

IFREMER and Kélonia

Dataset credit

Institut Français pour L'Exploitation de la Mer (IFREMER) and Kélonia


Primary contact Jérôme Bourjea IFREMER
Data entry Connie Kot


Bourjea, J. 2014. IFREMER/Kélonia satellite tracked late juvenile loggerhead sea turtles from Réunion Island 2008-2012. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/1014) on yyyy-mm-dd.


A satellite tracking study was conducted on juvenile loggerhead sea turtles in the Indian Ocean. Eighteen individuals were fitted with transponders and tracked from Réunion Island (21.2°S, 55.3°E) in order to investigate movements and diving patterns. Nine turtles swam north towards Oman (20.5°N, 58.8°E), where one of the world’s largest rookeries of loggerheads is located. Three individuals travelled south towards South-Africa and Madagascar, countries that also host loggerhead nesting grounds. Fourteen of the transmitters relayed diving profiles. A dichotomy between diurnal and nocturnal diving behavior was observed. A greater number of shorter dives occurred during the day. Diving behavior also differed according to movement behavior as individuals spent more time in subsurface waters (<10 m) during transit phases. The study provides an improved understanding of the oceanic movements and diving behavior of juvenile loggerheads. The results address a significant gap in the understanding of loggerhead oceanic movements and may help with the conservation of the species.


The purpose was to study the movement and diving behavior of late juvenile loggerheads in the western Indian Ocean.

Supplemental information





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
oidUnique ID (created by OBIS-SEAMAP)
latitudeLatitude (decimal degrees)
longitudeLongitude (decimal degrees)
tag_idTag ID
obs_dateDate of observation
date_timeDate and time of observation
obs_timeTime of observation
time_zoneTime zone of the obs_time values (always UTC)
obs_countNumber of animals sighted (1)
sp_tsnSpecies ITIS TSN
lcLocation class
sp_codeSpecies code
sp_obsSpecies observed
commonCommon name of animal
providerData provider
ownerData owner
beachBeach of tagging location
countryCountry of tagging location
Marine mammals0
Sea turtles20,144
Rays and sharks0
Other species0
Non spatial0
Non species0
Date, Begin2008-10-06
Date, End2012-12-14
Temporal prec.111111
Latitude-41.30 - 20.15
Longitude18.97 - 67.84
Coord. prec.5 decimal digits
Data typeTelemetry location
TracklinesYES (ID: 1015)
Traveled (km)124,668
Travel hours64,184
Contr. throughSEAMAP_TO_SWOT
Sharing policy CC-BY-NC (Minimum)
Shared with SWOT
GBIF (via DOI)*
* Aggregated summary
See metadata in static HTML
See metadata in FGDC XML
See download history / statistics