Marine Biology

, Volume 158, Issue 5, pp 969–981 | Cite as

Factors affecting the detection distances of reef fish: implications for visual counts

  • Yves-Marie Bozec
  • Michel Kulbicki
  • Francis Laloë
  • Gérard Mou-Tham
  • Didier Gascuel
Original Paper

Abstract

Detection patterns of coral reef fish were assessed from the meta-analysis of distance sampling surveys performed by visual census in New Caledonia and French Polynesia, from 1986 to 1999. From approximately 100,000 observations relating to 593 species, the frequency distributions of fish detection distances perpendicular to the transect line were compared according to species characteristics and sampling conditions. The shape and extension of these detection profiles varied markedly with fish size, shyness, and crypticity, indicating strong differences of detectability across species. Detection of very small and cryptic fish decreased strongly 1 m away from the line. Conversely, sightings of shy and large species were excessively low in the first meters due to diver avoidance prior to detection. The larger the fish, the greater the fleeing distance. Distance data underscore how inconsistent detectability biases across species and sites can affect the accuracy of visual censuses when assessing coral reef fish populations.

Supplementary material

227_2011_1623_MOESM1_ESM.doc (500 kb)
Supplementary material 1 (DOC 500 kb)
227_2011_1623_MOESM2_ESM.doc (96 kb)
Supplementary material 2 (DOC 95 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Yves-Marie Bozec
    • 1
    • 6
  • Michel Kulbicki
    • 2
  • Francis Laloë
    • 3
  • Gérard Mou-Tham
    • 4
  • Didier Gascuel
    • 5
  1. 1.Marine Spatial Ecology Lab, School of BioSciencesUniversity of ExeterExeterUK
  2. 2.IRDUniversité de PerpignanPerpignan CedexFrance
  3. 3.UMR GRED, IRD/UPV-Montpellier 3, IRDMontpellier Cedex 5France
  4. 4.IRDNouméa Cedex, New CaledoniaFrance
  5. 5.Université Européenne de BretagneUMR INRA/Agrocampus Ouest “Ecologie et Santé des Ecosystèmes”Rennes CedexFrance
  6. 6.School of Biological SciencesUniversity of QueenslandSt. Lucia, BrisbaneAustralia

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