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

doi:10.3354/meps12283

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 journal › Comment/debate › peer-review

9 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 (CN_e) 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). CN_e 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 language	English
Pages (from-to)	251-255
Number of pages	5
Journal	Marine Ecology Progress Series
Volume	577
DOIs	https://doi.org/10.3354/meps12283
Publication status	Published - 18 Aug 2017

Keywords

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

Access to Document

10.3354/meps12283Licence: Unspecified

Cite this

@article{858fd689558641fcb255fa570c6411e7,

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

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.",

keywords = "Abundance, Carcharodon carcharias, Contemporary effective population size, Linkage disequilibrium, Mark-recapture, POPAN, White shark",

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

year = "2017",

month = aug,

day = "18",

doi = "10.3354/meps12283",

language = "English",

volume = "577",

pages = "251--255",

journal = "Marine Ecology Progress Series",

issn = "0171-8630",

publisher = "Inter-Research",

}

TY - JOUR

T1 - Pessimistic assessment of white shark population status in South Africa

T2 - Comment on Andreotti et al. (2016)

AU - Irion, Dylan T.

AU - Noble, Leslie R.

AU - Kock, Alison A.

AU - Gennari, Enrico

AU - Dicken, Matt L.

AU - Hewitt, Adrian M.

AU - Towner, Alison V.

AU - Booth, Anthony J.

AU - Smale, Malcolm J.

AU - Cliff, Geremy

PY - 2017/8/18

Y1 - 2017/8/18

N2 - 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.

AB - 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.

KW - Abundance

KW - Carcharodon carcharias

KW - Contemporary effective population size

KW - Linkage disequilibrium

KW - Mark-recapture

KW - POPAN

KW - White shark

UR - http://www.scopus.com/inward/record.url?scp=85027702243&partnerID=8YFLogxK

U2 - 10.3354/meps12283

DO - 10.3354/meps12283

M3 - Comment/debate

AN - SCOPUS:85027702243

SN - 0171-8630

VL - 577

SP - 251

EP - 255

JO - Marine Ecology Progress Series

JF - Marine Ecology Progress Series

ER -

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this