A biphasic navigational strategy in loggerhead sea turtles.
Sci Rep
; 10(1): 18130, 2020 10 22.
Article
en En
| MEDLINE
| ID: mdl-33093603
ABSTRACT
The homing journeys of nine loggerhead turtles translocated from their nesting beach to offshore release sites, were reconstructed through Argos and GPS telemetry while their water-related orientation was simultaneously recorded at high temporal resolution by multi-sensor data loggers featuring a three-axis magnetic sensor. All turtles managed to return to the nesting beach area, although with indirect routes encompassing an initial straight leg not precisely oriented towards home, and a successive homebound segment carried out along the coast. Logger data revealed that, after an initial period of disorientation, turtles were able to precisely maintain a consistent direction for several hours while moving in the open sea, even during night-time. Their water-related headings were in accordance with the orientation of the resulting route, showing little or no effect of current drift. This study reveals a biphasic homing strategy of displaced turtles involving an initial orientation weakly related to home and a successive shift to coastal navigation, which is in line with the modern conceptual framework of animal migratory navigation as deriving from sequential mechanisms acting at different spatial scales.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Orientación
/
Tortugas
/
Migración Animal
/
Fenómenos de Retorno al Lugar Habitual
Límite:
Animals
Idioma:
En
Año:
2020
Tipo del documento:
Article