Machado A. 2023. Canary Islands - OAG. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/496) on yyyy-mm-dd and originated from Satellite Tracking and Analysis Tool (STAT; http://www.seaturtle.org/tracking/index.shtml?project_id=315).
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.
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)
Number of messages received
definition not provided
Best signal strength in dB
Pass duration in seconds
Number Of Plausibility Checks successful (from 0-4)