Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

The diving behaviour of green turtles undertaking oceanic migration to and from Ascension Island: dive durations, dive profiles and depth distribution

Författare

  • G. C. Hays
  • Susanne Åkesson
  • A. C. Broderick
  • F. Glen
  • B. J. Godley
  • P. Luschi
  • C. Martin
  • D. Metcalfe
  • F. Papi

Summary, in English

Satellite telemetry was used to record the submergence duration of green turtles (Chelonia mydas) as they migrated from Ascension Island to Brazil (N=12 individuals) while time/depth recorders (TDRs) were used to examine the depth distribution and dive profiles of individuals returning to Ascension Island to nest after experimental displacement (N=5 individuals). Satellite telemetry revealed that most submergences were short (<5 min) but that some submergences were longer (>20 min), particularly at night. TDRs revealed that much of the time was spent conducting short (24 min), shallow (approximately 0.91.5 m) dives, consistent with predictions for optimisation of near-surface travelling, while long (typically 2030 min), deep (typically 1020 m) dives had a distinctive profile found in other marine reptiles. These results suggest that green turtles crossing the Atlantic do not behave invariantly, but instead alternate between periods of travelling just beneath the surface and diving deeper. These deep dives may have evolved to reduce silhouetting against the surface, which would make turtles more susceptible to visual predators such as large sharks.

Publiceringsår

2001

Språk

Engelska

Sidor

4093-4098

Publikation/Tidskrift/Serie

Journal of Experimental Biology

Volym

204

Issue

23

Dokumenttyp

Artikel i tidskrift

Förlag

The Company of Biologists Ltd

Ämne

  • Biological Sciences

Status

Published

Forskningsgrupp

  • Animal Navigation Lab

ISBN/ISSN/Övrigt

  • ISSN: 1477-9145