Pessimistic assessment of white shark population status in South Africa: Comment on Andreotti et al. (2016)

Dylan T. Irion*, Leslie R. Noble, Alison A. Kock, Enrico Gennari, Matt L. Dicken, Adrian M. Hewitt, Alison V. Towner, Anthony J. Booth, Malcolm J. Smale, Geremy Cliff

*Corresponding author for this work

Research output: Contribution to journalComment/debate

4 Citations (Scopus)

Abstract

Andreotti et al. (2016; Mar Ecol Prog Ser 552:241-253) estimate an abundance (N) of 438 white sharks Carcharodon carcharias and a contemporary effective population size (CNe) of 333 individuals along the South African coast. N was estimated by using a mark-recapture analysis of photographic identification records from a single aggregation site (Gansbaai). CNe was calculated based on the levels of pairwise linkage disequilibrium of genetic material collected from 4 aggregation sites across approximately 965 km of South African coastline. However, due to the complex stock structure of white sharks and the model assumptions made by Andreotti et al. (2016), the conclusions drawn cannot be supported by their methods and data.

Original languageEnglish
Pages (from-to)251-255
Number of pages5
JournalMarine Ecology Progress Series
Volume577
DOIs
Publication statusPublished - 18 Aug 2017

Keywords

  • Abundance
  • Carcharodon carcharias
  • Contemporary effective population size
  • Linkage disequilibrium
  • Mark-recapture
  • POPAN
  • White shark

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    Irion, D. T., Noble, L. R., Kock, A. A., Gennari, E., Dicken, M. L., Hewitt, A. M., Towner, A. V., Booth, A. J., Smale, M. J., & Cliff, G. (2017). Pessimistic assessment of white shark population status in South Africa: Comment on Andreotti et al. (2016). Marine Ecology Progress Series, 577, 251-255. https://doi.org/10.3354/meps12283