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Marine Biology

, 163:144 | Cite as

Using bomb radiocarbon to estimate age and growth of the white shark, Carcharodon carcharias, from the southwestern Indian Ocean

  • Heather M. ChristiansenEmail author
  • Steven E. Campana
  • Aaron T. Fisk
  • Geremy Cliff
  • Sabine P. Wintner
  • Sheldon F. J. Dudley
  • Lisa A. Kerr
  • Nigel E. Hussey
Original paper

Abstract

Knowledge of age and growth parameters is vital to the conservation and management of white sharks (Carcharodon carcharias), but ages have not been validated for all populations and growth rates can vary regionally. Bomb radiocarbon (14C) analyses conducted on four individual white sharks [329, 414, 487, and 537 cm fork length (FL)] from the southwest Indian Ocean (SWI) were proximally aligned with Δ14C reference chronologies accepting established error, providing evidence to support annual band pair formation to 30–38 years for the SWI population. To enable comparison with previous studies on bomb radiocarbon in white sharks, a subset of specimens from the northwest Atlantic Ocean (NWA; 223.5, 441, and 493 cm FL) and northeast Pacific Ocean (NEP; 214, 365, and 429 cm FL) were also analyzed for 14C, revealing samples from the SWI were more enriched in 14C than samples from the NWA or NEP. Vertebral band pair counts were then determined for a larger set of white sharks from the SWI (140–422 cm FL, n = 51) resulting in age ranges of 1–38 years. The Gompertz growth model best described the SWI data, with an asymptotic size (L ) of 496.77 cm FL and length at birth (L 0) of 134.08 cm FL. The results of this study indicate white sharks in the SWI are longer-lived and grow more slowly compared to past estimates, but these data are more similar to recent age and growth estimates from other geographically distinct populations. This has important implications for the management of this species in the waters off southern Africa.

Keywords

Fork Length White Shark Band Pair Vertebral Centra Carcharodon Carcharias 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The Natural Science and Engineering Research Council of Canada and the Canada Research Chair program provided funding for this project to ATF. HMC was supported in part by scholarships and graduate assistantships from the University of Windsor. We thank the KwaZulu-Natal Sharks Board Laboratory and Operations staff for the dissection of sharks and sample collection and Warren Joyce from the Bedford Institute of Oceanography for preparing, imaging, and micromilling vertebral sections for bomb radiocarbon analysis. We appreciate the discussions with Lisa Natanson and thank her for her assistance with manuscript edits. We thank Megan Winton for her assistance with the statistical analysis. We also thank Allen H. Andrews of NOAA Fisheries and an anonymous reviewer for their helpful comments on the manuscript.

Supplementary material

227_2016_2916_MOESM1_ESM.pdf (55 kb)
Supplementary material 1 (PDF 55 kb)
227_2016_2916_MOESM2_ESM.pdf (66 kb)
Supplementary material 2 (PDF 66 kb)
227_2016_2916_MOESM3_ESM.pdf (88 kb)
Supplementary material 3 (PDF 87 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Heather M. Christiansen
    • 1
    Email author
  • Steven E. Campana
    • 2
    • 7
  • Aaron T. Fisk
    • 1
  • Geremy Cliff
    • 3
    • 4
  • Sabine P. Wintner
    • 3
    • 4
  • Sheldon F. J. Dudley
    • 5
  • Lisa A. Kerr
    • 6
  • Nigel E. Hussey
    • 1
  1. 1.Great Lakes Institute for Environmental ResearchUniversity of WindsorWindsorCanada
  2. 2.Population Ecology DivisionBedford Institute of OceanographyDartmouthCanada
  3. 3.KwaZulu-Natal Sharks BoardUmhlanga RocksSouth Africa
  4. 4.Biomedical Resource UnitUniversity of KwaZulu-NatalDurbanSouth Africa
  5. 5.Department of AgricultureForestry and FisheriesRogge Bay, Cape TownSouth Africa
  6. 6.Gulf of Maine Research InstitutePortlandUSA
  7. 7.Life and Environmental SciencesUniversity of IcelandReykjavíkIceland

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