Mistaken identity? Visual similarities of marine debris to natural prey items of sea turtles

Schuyler, Qamar A, Wilcox, Chris, Townsend, Kathy, Hardesty, B. Denise and Marshall, N. Justin (2014) Mistaken identity? Visual similarities of marine debris to natural prey items of sea turtles. BMC Ecology, 14 14.1-14.7. doi:10.1186/1472-6785-14-14

Author Schuyler, Qamar A
Wilcox, Chris
Townsend, Kathy
Hardesty, B. Denise
Marshall, N. Justin
Title Mistaken identity? Visual similarities of marine debris to natural prey items of sea turtles
Journal name BMC Ecology   Check publisher's open access policy
ISSN 1472-6785
Publication date 2014-05-09
Sub-type Article (original research)
DOI 10.1186/1472-6785-14-14
Open Access Status DOI
Volume 14
Start page 14.1
End page 14.7
Total pages 7
Place of publication London, United Kingdom
Publisher BioMed Central
Language eng
Formatted abstract
Background: There are two predominant hypotheses as to why animals ingest plastic: 1) they are opportunistic feeders, eating plastic when they encounter it, and 2) they eat plastic because it resembles prey items. To assess which hypothesis is most likely, we created a model sea turtle visual system and used it to analyse debris samples from beach surveys and from necropsied turtles. We investigated colour, contrast, and luminance of the debris items as they would appear to the turtle. We also incorporated measures of texture and translucency to determine which of the two hypotheses is more plausible as a driver of selectivity in green sea turtles.

Results: Turtles preferred more flexible and translucent items to what was available in the environment, lending support to the hypothesis that they prefer debris that resembles prey, particularly jellyfish. They also ate fewer blue items, suggesting that such items may be less conspicuous against the background of open water where they forage.

Conclusions: Using visual modelling we determined the characteristics that drive ingestion of marine debris by sea turtles, from the point of view of the turtles themselves. This technique can be utilized to determine debris preferences of other visual predators, and help to more effectively focus management or remediation actions.
Keyword Chelonia mydas
Chromatic space
Eretmochelys imbricata
Marine debris
Vorobyev-Osorio model
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Brain Institute Publications
Official 2015 Collection
School of Biological Sciences Publications
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