Magnet-induced disorientation in hatchling loggerhead sea turtles

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Magnet-induced disorientation in hatchling loggerhead sea turtles.

Laboratory experiments have indicated that hatchling loggerhead sea turtles (Caretta caretta) are able to establish and maintain courses using information from the Earth's magnetic field. In previous experiments, turtles were tested in relatively uniform magnetic fields generated by large coil systems surrounding an orientation arena. In this study, we investigated the orientation behavior of h...

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Magnetic Orientation by Hatchling Loggerhead Sea Turtles

Laboratory experiments were conducted to test the ability of loggerhead sea turtle hatchlings (Caretta caretta L.) to orient using the magnetic field of the earth. Hatchlings were tethered to a rotatable lever-arm apparatus which tracked swimming orientation in complete darkness. Hatchlings tested in the earth's magnetic field were nonrandomly oriented with a mean angle of 42°; those tested und...

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The magnetic map of hatchling loggerhead sea turtles.

Young loggerhead sea turtles (Caretta caretta) from eastern Florida, U.S.A., undertake a transoceanic migration in which they gradually circle the North Atlantic Ocean before returning to the North American coast. Hatchlings in the open sea are guided at least partly by a 'magnetic map' in which regional magnetic fields function as navigational markers and elicit changes in swimming direction a...

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Conservation Implications of Dietary DilutionfromDebris Ingestion: Sublethal Effects in Post-Hatchling Loggerhead Sea Turtles

Ingestion of anthropogenic debris by marine species has been documented extensively; fewer studies have attempted to quantify the sublethal effects caused by debris ingestion. One potential sublethal effect is reduced nutrient gains from diets diluted by consumption of debris. Post-hatchling and juvenile loggerhead sea turtles (Caretta caretta) consume substantial quantities of debris. We evalu...

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Orientation of hatchling loggerhead sea turtles to regional magnetic fields along a transoceanic migratory pathway.

Young loggerhead sea turtles (Caretta caretta) from the east coast of Florida, USA, undertake a transoceanic migration around the North Atlantic Gyre, the circular current system that flows around the Sargasso Sea. Previous experiments indicated that loggerhead hatchlings, when exposed to magnetic fields replicating those that exist at five widely separated locations along the migratory pathway...

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ژورنال

عنوان ژورنال: Journal of Experimental Biology

سال: 2003

ISSN: 1477-9145,0022-0949

DOI: 10.1242/jeb.00108