Canary Islands - OAG

Observatorio Ambiental Granadilla

Dataset credit

Data provider
Observatorio Ambiental Granadilla
Originating data center
Satellite Tracking and Analysis Tool (STAT)
Project partner
Observatorio Ambiental Granadilla (OAG).- Dr Antonio Machado

Sociedad de Estudio de Cetáceos en el Archipiélago Canario (SECAC).- Vidal Martín

Centro de Gestión de Biodiversidad (BIOGES) del Departamento de Biología de la Universidad de Las Palmas de Gran Canaria.- Dr Luis Pelipe López-Jurado

Centro de Recuperación de Fauna Silvestre del Cabildo Insular de Gran Canaria (CRFS).- Pascual Calabuig
Project sponsor or sponsor description
Ministerio de Fomento


Primary contact Antonio Machado Observatorio Ambiental Granadilla
Data entry Michael Coyne



The waters around Canary Islands constitute a foraging ground for juvenile loggerheads from different Atlantic nesting populations.

The Granadilla Environmental Observatory (OAG, Observatorio Ambiental Granadilla) is developing a monitoring program of the loggerhead in order to gain additional information on the distributional patterns of the species provided by previous programs (i.e. Aegina).

The OAG is a Spanish State foundation recently created and based in Tenerife, Canary Islands, aiming to monitor environmental conditions of the sea and the state of biodiversity and marine protected areas in waters around the Canary Islands and, extensively, the archipelago of Madeira and the Azores (the Atlantic subregion called Macaronesia). One of its objectives is also the follow-up of the impacts of large marine-based infrastructures, such as large ports.


Loggerheads are present in the archipelago the entire the year, but there are no breeding colonies. To study an open resident segment of the Atlantic population, satellite tracking data from previous projects were compiled, and 19 additional animals marked, increasing the dataset to 39 turtles, with 14,608 high quality signals. Each year observation
transects were performed on at least three islands for estimating the relative
density of turtles. To analyze the segment size/age structure as well as the negative impacting factors on the species, data from all recovery centers in the Canaries were compiled and studied (2,836 specimens, 1998-2012). These dataseries are far from being optimal, but constitute the best available information at present.

Supplemental information

Visit STAT's project page for additional 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
prognumProgram number
tag_idPTT ID
lcLocation class
iqQuality indicator
dir1Dir 1
nb_mesNumber of messages received
big_nb_mesdefinition not provided
best_levelBest signal strength in dB
pass_durationPass duration in seconds
nopcNumber Of Plausibility Checks successful (from 0-4)
calcul_freqCalculated frequency
altitudeAltitude used for location calculation
speciesSpecies name
project_idSTAT Project ID
lc_filterParameters to location filtering
speed_filterParameters to speed filtering
distance_filterParameters to distance filtering
topo_filterParameters to topo filtering
time_filterParameters to time filtering
angle_filterParameters to angle filtering
life_stageLife stage of the animal
genderGender of the animal
wetdryWet or dry
wetdry_filterParameters to Wet or dry filterint
obs_datetimeDate and time (local time zone)
timezone_hTime difference from UTC
Marine mammals0
Sea turtles9,324
Rays and sharks0
Other species0
Non spatial0
Non species0
Date, Begin2008-09-04
Date, End2012-03-21
Temporal prec.111111
Latitude5.43 - 45.15
Longitude-74.46 - 32.09
Coord. prec.3 decimal digits
Data typeTelemetry location
TracklinesYES (ID: 497)
Traveled (km)242,986
Travel hours162,192
Contr. throughSatellite Tracking and Analysis Tool
Sharing policy Permission required
Shared with SWOT
GBIF (via DOI)*
* Aggregated summary
See metadata in static HTML
See metadata in FGDC XML
See download history / statistics