To do this, biologists have 75 birds equipped with GPS trackers.
The trajectory of the birds with the alloy in the water is determined by the course that can be used to collect data on its features. Spanish scientists have found this. They are outfitted with GPS trackers Mediterranean petrels, inhabiting in the Balearic sea, and compared the data about their movement through the water with satellite data of changes in currents.
Marine animals are used to obtain climate data for quite a long time. Previously, scientists have used GPS sensors to determine the trajectories of flights of several species of birds, showing that the thus obtained data on changes in the speed of birds can more accurately tell of sea winds than satellite data, informs Rus.Media.
All such studies, however, have focused on the analysis of the flight of birds and their behaviour when searching for food. The relationship between the alloy of the birds of the sea surface (or “rafting”) and natural phenomena are poorly understood: it is assumed, however, that the movement of birds during a relaxed alloy marine waters can tell a lot about the course.
To study this relationship decided biologists under the leadership of Antonio Sanchez Roman (Antonio Sánchez Román) from the Spanish Mediterranean Institute for advanced studies. To do this, they compared data about sea currents in the Balearic sea obtained from satellite data on grades 75 Mediterranean petrels in the period from 2007 to 2012. All scientists failed to register 405 cases of such alloys. 85% of all described cases such alloys lasted from 3 to 6 hours, and in another 15% reached the 10 hours.
Researchers found that 76% of reported cases, the trajectory of petrels correlated with the movement of water in the surface layer and ekmans spiral (direction of movement in the water with distance from the border), caused by the flow of air. In 59% of cases direction of movement of the petrels were directly associated with the direction of surface currents (currents at depths less than 15 meters).
Based on these data, the authors came to the conclusion that the Mediterranean petrels passive alloy in sea water followed by changes in the direction of the currents caused by the wind force, so data on their movement can be used for analysis of trends.
Often GPS trackers are being used to study animal behavior in the wild. For example, in 2017 biologists equipped sharks beacons in order to track how their appearance influences the level of stress the seals.