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  • Fahlman, Andreas, et al. (author)
  • Deep diving by offshore bottlenose dolphins (Tursiops spp.)
  • 2023
  • In: Marine mammal science. - : WILEY. - 0824-0469 .- 1748-7692. ; 39:4, s. 1251-1266
  • Journal article (peer-reviewed)abstract
    • We used satellite-linked tags to evaluate dive behavior in offshore bottlenose dolphins (Tursiops spp.) near the island of Bermuda. The data provide evidence that bottlenose dolphins commonly perform both long (>272 s) and deep (>199 m) dives, with the deepest and longest dives being to 1,000 m and 826 s (13.8 min), respectively. The data show a relationship between dive duration and dive depth for dives longer than about 272 s. There was a diurnal pattern to dive behavior, with most dives deeper than 50 m being performed at night; deep diving began at sunset and varied throughout the night. We used the cumulative frequency of dive duration to estimate a behavioral aerobic dive limit (bADL) of around 560-666 s (9.3-11.1 min) in adult dolphins in this population. Dives exceeding the bADL spent significantly longer time in the upper-most 50 m following a dive as compared with dives less than the bADL. We conclude that the offshore ecotype off Bermuda, unlike the shallow-diving near-shore bottlenose dolphin, is a deep-diving ecotype, and may provide a useful animal model to study extreme diving behavior and adaptations.
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3.
  • Niemi, MEK, et al. (author)
  • 2021
  • swepub:Mat__t
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