The absence of sharks from abyssal regions of the world's oceans

Imants George Priede (Corresponding Author), R. Froese, D. M. Bailey, O. A. Bergstad, J. E. Dyb, Camila Henriques, E. G. Jones, Nicola Jane Cousins

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

The oceanic abyss (depths greater than 3000 m), one of the largest environments on the planet, is characterized by absence of solar light, high pressures and remoteness from surface food supply necessitating special molecular, physiological, behavioural and ecological adaptations of organisms that live there. Sampling by trawl, baited hooks and cameras we show that the Chondrichthyes (sharks, rays and chimaeras) are absent from, or very rare in this region. Analysis of a global data set shows a trend of rapid disappearance of chondrichthyan species with depth when compared with bony fishes. Sharks, apparently well adapted to life at high pressures are conspicuous on slopes down to 2000 m including scavenging at food falls such as dead whales. We propose that they are excluded from the abyss by high-energy demand, including an oil-rich liver for buoyancy, which cannot be sustained in extreme oligotrophic conditions. Sharks are apparently confined to ca 30% of the total ocean and distribution of many species is fragmented around sea mounts, ocean ridges and ocean margins. All populations are therefore within reach of human fisheries, and there is no hidden reserve of chondrichthyan biomass or biodiversity in the deep sea. Sharks may be more vulnerable to over-exploitation than previously thought.
Original languageEnglish
Pages (from-to)1435-1441
Number of pages6
JournalProceedings of the Royal Society of London. B, Biological Sciences
Volume273
Issue number1592
DOIs
Publication statusPublished - Jun 2006

Keywords

  • chondrichthyes
  • sharks
  • deep-sea fishes
  • abyss
  • elasmobranches
  • North Pacific-Ocean
  • sea demersal fishes
  • baited camera
  • in-situ
  • acoustic tracking
  • seasonal-change
  • Atlantic-Ocean
  • deep
  • behavior
  • grenadier

Cite this

Priede, I. G., Froese, R., Bailey, D. M., Bergstad, O. A., Dyb, J. E., Henriques, C., ... Cousins, N. J. (2006). The absence of sharks from abyssal regions of the world's oceans. Proceedings of the Royal Society of London. B, Biological Sciences, 273(1592), 1435-1441 . https://doi.org/10.1098/rspb.2005.3461

The absence of sharks from abyssal regions of the world's oceans. / Priede, Imants George (Corresponding Author); Froese, R.; Bailey, D. M.; Bergstad, O. A.; Dyb, J. E.; Henriques, Camila; Jones, E. G.; Cousins, Nicola Jane.

In: Proceedings of the Royal Society of London. B, Biological Sciences, Vol. 273, No. 1592, 06.2006, p. 1435-1441 .

Research output: Contribution to journalArticle

Priede, IG, Froese, R, Bailey, DM, Bergstad, OA, Dyb, JE, Henriques, C, Jones, EG & Cousins, NJ 2006, 'The absence of sharks from abyssal regions of the world's oceans', Proceedings of the Royal Society of London. B, Biological Sciences, vol. 273, no. 1592, pp. 1435-1441 . https://doi.org/10.1098/rspb.2005.3461
Priede, Imants George ; Froese, R. ; Bailey, D. M. ; Bergstad, O. A. ; Dyb, J. E. ; Henriques, Camila ; Jones, E. G. ; Cousins, Nicola Jane. / The absence of sharks from abyssal regions of the world's oceans. In: Proceedings of the Royal Society of London. B, Biological Sciences. 2006 ; Vol. 273, No. 1592. pp. 1435-1441 .
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