Video Experimental Relacionado
Updated: Jul 9, 2026

08:28
Using Pharmacological Manipulation and High-precision Radio Telemetry to Study the Spatial Cognition in Free-ranging Animals
Published on: November 6, 2016
Los campos magnéticos regionales como marcadores de navegación para las tortugas marinas
K J Lohmann1, S D Cain, S A Dodge
1Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USA. klohmann@email.unc.edu
Resumen
Las tortugas marinas jóvenes usan los campos magnéticos de la Tierra como marcadores de navegación. Esto les ayuda a migrar a través del Océano Atlántico Norte, guiando su viaje de regreso a la costa de América del Norte.
Área de la Ciencia:
- Biología Marina Biología Marina.
- Navegación de los animales.
- La geofísica es la geofísica.
Sus antecedentes:
- Las tortugas marinas de cabeza de león (Caretta caretta) realizan extensas migraciones transoceánicas.
- Las tortugas jóvenes del este de Florida migran a través del giro del Atlántico Norte antes de regresar a América del Norte.
Objetivo del estudio:
- Para investigar el papel de los campos magnéticos en la navegación de las tortugas marinas jóvenes.
- Para determinar si las tortugas responden a los campos magnéticos que imitan diferentes regiones oceánicas.
Principales métodos:
- Los cachorros fueron expuestos a campos magnéticos simulados de tres ubicaciones oceánicas distintas.
- Sus direcciones de natación fueron registradas y analizadas en respuesta a cada campo magnético.
Principales resultados:
- Las tortugas exhibieron respuestas de natación distintas a cada campo magnético.
- Estas respuestas consistentemente dirigieron a las tortugas a permanecer dentro de las corrientes de giro del Atlántico Norte.
- Los campos magnéticos parecían guiar a las tortugas a lo largo de su ruta migratoria.
Conclusiones:
- Las cabezas de madera jóvenes poseen un sentido magnético para la navegación.
- Los campos magnéticos regionales actúan como marcadores cruciales de navegación para las tortugas marinas.
- Las señales magnéticas desencadenan cambios direccionales, lo que facilita una migración exitosa.
Videos de Conceptos Relacionados
Magnetic Field Lines
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetic field lines follow several hard-and-fast rules:
Meridians
In surveying, meridians are vital reference lines to measure directions and establish accurate land orientations. Meridians run from the north to the south poles, providing a stable framework for angular measurements and mapping. Meridians are fundamental in survey design, with the primary types being astronomic, magnetic, and assumed meridians. Each type offers distinct benefits and limitations, selected based on the project's scale and precision needs.The astronomic meridian is aligned with...
Compass
The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...
Magnetic Declination
Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
Local Attraction
Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
Other Unique Bacteria
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...

